1
|
Snopok BA, Nizamov SN, Snopok TV, Mirsky VM. Agglomeration compaction promotes corrosion of gold nanoparticles. NANOSCALE ADVANCES 2024; 6:3865-3877. [PMID: 39050952 PMCID: PMC11265584 DOI: 10.1039/d4na00109e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 06/07/2024] [Indexed: 07/27/2024]
Abstract
Engineered nanoparticles are increasingly being used in various areas of human activity. However, the degradation mechanism of nanobodies in harsh environments is still a puzzle for theory and experiment. We report here the results of optical spectroscopy and nanoparticle tracking analysis, quantifying agglomeration and sizing of 50 nm citrate stabilized gold nanoparticles (GNPs) in HCl solutions containing H2O2. The mechanism of a consecutive corrosion reaction of GNPs is discussed within the framework of the near-field approach. We found that the disappearance of single nanoparticles from a suspension does not occur due to their dissolution per se, but is a consequence of the formation of aggregates. The neutralization of electrostatic shielding at high ionic strength allows gold nanoparticles to approach the subnanometer distance within the region of capping defects, at which the Casimir and van der Waals attractive forces dominate. It is suggested that electric field fluctuations in the confined space between highly conductive gold nanoparticles cause complexant-stimulated loss of metal from the core in the contact area. Going beyond the charge screening limitations by constraining the reaction space and reducing the double electrical layer thickness allows for chemical processes flow along otherwise not accessible reaction pathways.
Collapse
Affiliation(s)
- Borys A Snopok
- VE Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine 41 pr. Nauki Kyiv 03028 Ukraine
| | - Shavkat N Nizamov
- Nanobiotechnology - Institute of Biotechnology, Brandenburg Technical University, Cottbus-Senftenberg Universitätsplatz 1 Senftenberg 01968 Germany
| | - Tetiana V Snopok
- VE Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine 41 pr. Nauki Kyiv 03028 Ukraine
| | - Vladimir M Mirsky
- Nanobiotechnology - Institute of Biotechnology, Brandenburg Technical University, Cottbus-Senftenberg Universitätsplatz 1 Senftenberg 01968 Germany
| |
Collapse
|
2
|
Bibi SB, El-Zohry AM, Davies B, Grigorev V, Goodwin CM, Lömker P, Holm A, Ali-Löytty H, Garcia-Martinez F, Schlueter C, Soldemo M, Koroidov S, Hansson T. Multi-spectroscopic study of electrochemically-formed oxide-derived gold electrodes. Phys Chem Chem Phys 2024; 26:2332-2340. [PMID: 38165839 DOI: 10.1039/d3cp04009g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Oxide-derived metals are produced by reducing an oxide precursor. These materials, including gold, have shown improved catalytic performance over many native metals. The origin of this improvement for gold is not yet understood. In this study, operando non-resonant sum frequency generation (SFG) and ex situ high-pressure X-ray photoelectron spectroscopy (HP-XPS) have been employed to investigate electrochemically-formed oxide-derived gold (OD-Au) from polycrystalline gold surfaces. A range of different oxidizing conditions were used to form OD-Au in acidic aqueous medium (H3PO4, pH = 1). Our electrochemical data after OD-Au is generated suggest that the surface is metallic gold, however SFG signal variations indicate the presence of subsurface gold oxide remnants between the metallic gold surface layer and bulk gold. The HP-XPS results suggest that this subsurface gold oxide could be in the form of Au2O3 or Au(OH)3. Furthermore, the SFG measurements show that with reducing electrochemical treatments the original gold metallic state can be restored, meaning the subsurface gold oxide is released. This work demonstrates that remnants of gold oxide persist beneath the topmost gold layer when the OD-Au is created, potentially facilitating the understanding of the improved catalytic properties of OD-Au.
Collapse
Affiliation(s)
- Sara Boscolo Bibi
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Ahmed M El-Zohry
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Bernadette Davies
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
- Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114 18 Stockholm, Sweden
| | - Vladimir Grigorev
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Christopher M Goodwin
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Patrick Lömker
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Alexander Holm
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Harri Ali-Löytty
- Surface Science Group, Photonics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere University, Finland
| | | | - Christoph Schlueter
- Photon Science, Deutsches ElektronenSynchrotron (DESY), 22607 Hamburg, Germany
| | - Markus Soldemo
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Sergey Koroidov
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| | - Tony Hansson
- Department of Physics, AlbaNova University Center, Stockholm University, 10691 Stockholm, Sweden.
| |
Collapse
|
3
|
Ganzoury MA, Hanna CM, Zhang N, Wu Y, de Lannoy CF. Catch and release: Gold adsorption and sorbent electrochemical regeneration. JOURNAL OF HAZARDOUS MATERIALS 2024; 462:132721. [PMID: 37865077 DOI: 10.1016/j.jhazmat.2023.132721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 10/02/2023] [Accepted: 10/03/2023] [Indexed: 10/23/2023]
Abstract
Wastewater generated from e-waste leaching is rich in precious metals including gold, silver and platinum. Conventional precipitation and solvent extraction are chemically intensive separations with concerning environmental externalities. Sorbents, in particular carbon nanotubes, have low chemical consumption, and have shown promise for gold adsorption due to their high specific surface area and chemical functionalization potential. However, regenerating sorbents used to adsorb Au is hazardous requiring strong acids. Herein, we delineate the effect of various functional groups on the sidewalls of multiwall carbon nanotubes (MWCNTs) on gold adsorption, and we introduced an acid-free electrochemical technique for Au elution from MWCNTs. Pristine MWCNTs (P-MWCNTs), carboxylic functionalised MWCNTs (COOH-MWCNTs) and amide functionalised MWCNTs (NH2-MWCNTs) were compared for their affinity for Au adsorption from acidic AuCl4-solutions mimicking acidic e-waste leachate. Au adsorption affinity onto MWCNTs followed the order of P-MWCNT > NH2-MWCNT > COOH-MWCNTs. Au elution from Au-saturated MWCNTs was subsequently achieved up to 65%, using acid-free electrochemical desorption in neutral aqueous brine. The Au electro-desorption was shown to have a direct relationship with both the applied current and the mass of the Au adsorbed on the MWCNTs. This study demonstrates enhanced adsorption-based preconcentration of gold and acid-free regeneration of sorbents.
Collapse
Affiliation(s)
- Mohamed A Ganzoury
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | - Christina M Hanna
- Department of Nanotechnology Engineering, Waterloo University, 200 University Ave W., Waterloo, ON, Canada
| | - Nan Zhang
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | - Yichen Wu
- Department of Chemical Engineering, McMaster University, 1280 Main St. W., Hamilton, ON, Canada
| | | |
Collapse
|
4
|
Marquez E, Keu KH, Nelson A, Lefler BM, May SJ, Tavassol H. Structural Evolution of Ultrathin SrFeO 3-δ Films during Oxygen Evolution Reaction Revealed by In Situ Electrochemical Stress Measurements. ACS APPLIED ENERGY MATERIALS 2023; 6:11882-11889. [PMID: 38098872 PMCID: PMC10716856 DOI: 10.1021/acsaem.3c01805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 10/23/2023] [Accepted: 10/23/2023] [Indexed: 12/17/2023]
Abstract
We report the electrochemical stress analysis of SrFeO3-δ (SFO) films deposited on Au substrates during oxygen evolution reactions (OERs). Our in situ analysis of Au reveals conversion reactions from Au to Au(OH)3, AuOOH, and AuOx during the OER. Au reactions cause a monotonic compressive stress on surfaces assigned to the formation of Au hydroxides and oxides. Electrochemical stress analysis of SrFeO3-δ/Au shows a dramatically different behavior during the OER, which we attribute to structural evolutions and conversion reactions, such as the conversion of SFO to iron (oxy)hydroxides. Interestingly, electrochemical stress analysis of SrFeO3-δ/Au shows a tensile trend, which evolves with cycling history. Electrochemical stress analysis of SFO films before the onset of the OER shows in situ changes, which cause tensile stresses when cycling to 1.2 V. We attribute these stresses to the formation of Fe2+δOδ(OH)2-δ (0 ≤ δ ≤ 1.5)-type materials where δ approaches 1.5 at higher potentials. At potentials higher than 1.2 V and during OER, surface stress response is rather stable, which we assign to the full conversion of SFO to iron (oxy)hydroxides. This analysis provides insight into the reaction mechanism and details of in situ structural changes of iron perovskites during the OER in alkaline environments.
Collapse
Affiliation(s)
- Emily Marquez
- Department
of Chemistry and Biochemistry, California
State University, Long Beach, California 90840, United States
| | - Kim Hong Keu
- Department
of Chemistry and Biochemistry, California
State University, Long Beach, California 90840, United States
| | - Andrea Nelson
- Department
of Physics and Astronomy, California State
University, Long Beach, California 90840, United States
| | - Benjamin M. Lefler
- Department
of Materials Science and Engineering, Drexel
University, Pennsylvania 19104, United States
| | - Steven J. May
- Department
of Materials Science and Engineering, Drexel
University, Pennsylvania 19104, United States
| | - Hadi Tavassol
- Department
of Chemistry and Biochemistry, California
State University, Long Beach, California 90840, United States
| |
Collapse
|
5
|
Han HH, Kim SK, Kim SJ, Choi I, Mok JW, Joo CK, Shin S, Hahn SK. Long-term stable wireless smart contact lens for robust digital diabetes diagnosis. Biomaterials 2023; 302:122315. [PMID: 37689048 DOI: 10.1016/j.biomaterials.2023.122315] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 09/01/2023] [Accepted: 09/02/2023] [Indexed: 09/11/2023]
Abstract
Wearable devices for digital continuous glucose monitoring (CGM) have attracted great attention as a new paradigm medical device for diabetes management. However, the relatively inaccurate performance and instability of CGM devices have limited their wide applications in the clinic. Here, we developed hyaluronate (HA) modified Au@Pt bimetallic electrodes for long-term accurate and robust CGM of smart contact lens. After glucose oxidation reaction, the bimetallic electrodes facilitated the rapid decomposition of hydrogen peroxide and charge transfer for robust CGM. The passivation of Au@Pt bimetallic electrode with branch-type thiolated HA prevented the dissolution of Au electrode by chloride ions in tears. In diabetic and normal rabbits, the smart contact lens with HA-Au@Pt bimetallic electrodes enabled the high correlation (ρ = 0.88) CGM with 98.6% clinically acceptable data for 3 weeks. Taken together, we could confirm the feasibility of our smart contact lens for long-term CGM for further clinical development.
Collapse
Affiliation(s)
- Hye Hyeon Han
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 37673, South Korea.
| | - Su-Kyung Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 37673, South Korea
| | - Seong-Jong Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 37673, South Korea
| | - Inhoo Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 37673, South Korea
| | - Jee Won Mok
- Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591, South Korea
| | - Choun-Ki Joo
- Department of Ophthalmology and Visual Science, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591, South Korea
| | - Sangbaie Shin
- PHI BIOMED Co., #613, 12 Gangnam-daero 65-gil, Seocho-gu, Seoul, 06612, South Korea
| | - Sei Kwang Hahn
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 37673, South Korea; PHI BIOMED Co., #613, 12 Gangnam-daero 65-gil, Seocho-gu, Seoul, 06612, South Korea.
| |
Collapse
|
6
|
Yamada R, Watanabe S, Tada H. Reservoir computing with the electrochemical formation and reduction of gold oxide in aqueous solutions with a three-electrode electrochemical setup. RSC Adv 2023; 13:24801-24804. [PMID: 37608968 PMCID: PMC10440635 DOI: 10.1039/d3ra04614a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 08/14/2023] [Indexed: 08/24/2023] Open
Abstract
Supervised classification of handwritten digits via physical reservoir computing (PRC) using electrochemistry with a three-electrode electrochemical setup was demonstrated. Short-term memory required for the PRC was realized for 3 bit pulse patterns by adjusting the formation/reduction ratio of gold oxides, showing a wide potential of electrochemistry as resources of PR devices.
Collapse
Affiliation(s)
- Ryo Yamada
- Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Shuto Watanabe
- Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Hirokazu Tada
- Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| |
Collapse
|
7
|
Edgington J, Seitz LC. Advancing the Rigor and Reproducibility of Electrocatalyst Stability Benchmarking and Intrinsic Material Degradation Analysis for Water Oxidation. ACS Catal 2023. [DOI: 10.1021/acscatal.2c06282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- Jane Edgington
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Linsey C. Seitz
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States
| |
Collapse
|
8
|
Kannan SK, Esakkiappa S, Anthonysamy E, Sudalaimuthu S, Sulaiman Y, Khan MM, Chinnaiah J, Krishnan G. Determination of urinary spermine using controlled dissolution of polysulfide modified gold electrode. Mikrochim Acta 2023; 190:87. [PMID: 36759372 DOI: 10.1007/s00604-023-05664-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 01/16/2023] [Indexed: 02/11/2023]
Abstract
Spermine (SPM) is considered a biomarker for prostate cancer and detecting it becomes highly challenging due to its electro- and optical-inactive nature. SPM has a tendency to interact with groups such as phosphates and sulfides to form macrocyclic arrangements known as nuclear aggregates of polyamines. Using this tendency, an electrochemical sensor has been developed using a polysulfide (PS) modified Au electrode (PS@Au electrode). PS has been synthesized from elemental sulfur by hydrothermal method and characterized using UV-Vis, fluorescence, FTIR, SEM, and XPS analyses. The PS@Au electrode was employed for electrochemical sensing of SPM. In the presence of SPM, a decrease in gold oxide reduction current was noted which is proportional to the concentration of SPM. The decrease in gold oxide reduction (0.5 V) current was attributed to the complexing nature of SPM-PS at the electrode interface. The reason for the decrease in current has been substantiated using XRF, XPS, and spectroelectrochemical studies. Under the optimized conditions, the PS@Au electrode exhibited a linear range of 1.55-250 µM with LOD of 0.511 ± 0.02 µM (3σ). The electrochemical strategy for SPM sensing exhibited better selectivity even in the presence of possible interferents. The selectivity stems from the selective interaction of SPM with PS on the Au electrode surface; the tested amino acids, and other molecules do not complex with PS and hence they could not interfere. The PS@Au electrode has been subjected to the determination of SPM in artificial urine samples and exhibited outstanding performance in the synthetic sample.
Collapse
Affiliation(s)
- Sanjeev Kumar Kannan
- Electrodics & Electrocatalysis Division, CSIR - Central Electrochemical Research Institute, Karaikudi, 630003, Tamil Nadu, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Subramani Esakkiappa
- Electroplating & Metal Finishing Division, CSIR - Central Electrochemical Research Institute, Karaikudi, 630003, Tamil Nadu, India
| | - Esokkiya Anthonysamy
- Electrodics & Electrocatalysis Division, CSIR - Central Electrochemical Research Institute, Karaikudi, 630003, Tamil Nadu, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sudalaimani Sudalaimuthu
- Electrodics & Electrocatalysis Division, CSIR - Central Electrochemical Research Institute, Karaikudi, 630003, Tamil Nadu, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Yusran Sulaiman
- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.,Functional Nanotechnology Devices Laboratory, Institute of Nanoscience and Nanotechnology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Mohammad Mansoob Khan
- Chemical Sciences, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Jeyabharathi Chinnaiah
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.,Electroplating & Metal Finishing Division, CSIR - Central Electrochemical Research Institute, Karaikudi, 630003, Tamil Nadu, India
| | - Giribabu Krishnan
- Electrodics & Electrocatalysis Division, CSIR - Central Electrochemical Research Institute, Karaikudi, 630003, Tamil Nadu, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
| |
Collapse
|
9
|
Bernal M, Torres D, Parapari SS, Čeh M, Rožman KŽ, Šturm S, Ustarroz J. A microscopic view on the electrochemical deposition and dissolution of Au with Scanning Electrochemical Cell Microscopy – Part I. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
|
10
|
Evaluating the Stability of Ir Single Atom and Ru Atomic Cluster Oxygen Evolution Reaction Electrocatalysts. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.141982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
11
|
De Angelis LD, Córdoba de Torresi SI, Dourado AHB. Mass Transport Influence in the SO
2
Oxidation Reaction on Au Electrodes. ChemElectroChem 2023. [DOI: 10.1002/celc.202201032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Leonardo D. De Angelis
- Departamento de Química Fundamental Instituto de Química Universidade de São Paulo Av. Prof. Lineu Prestes, 748 05508-000 São Paulo SP Brazil
| | - Susana I. Córdoba de Torresi
- Departamento de Química Fundamental Instituto de Química Universidade de São Paulo Av. Prof. Lineu Prestes, 748 05508-000 São Paulo SP Brazil
| | - André H. B. Dourado
- Departamento de Físico-Química Instituto de Química de São Carlos Universidade de São Paulo Av. Trab. São Carlense, 400 13566-590 São Carlos SP Brazil
| |
Collapse
|
12
|
Lee J, Suh HN, Park HB, Park YM, Kim HJ, Kim S. Regenerative Strategy of Gold Electrodes for Long-Term Reuse of Electrochemical Biosensors. ACS OMEGA 2023; 8:1389-1400. [PMID: 36643538 PMCID: PMC9835648 DOI: 10.1021/acsomega.2c06851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Gold is of considerable interest for electrochemical active surfaces because thiol-modified chemicals and biomolecules can be easily immobilized with a simple procedure. However, most gold surfaces are damaged with repetitive measurements, so they are difficult to reuse. Here we demonstrate a novel electrochemical cleaning method of gold surfaces to reuse electrodes with a simple protocol that is easy and nontoxic. This electrochemical cleaning consists of two steps by using different solutions. The 1st step is a cyclic voltammetry sweep using a very low concentration of sulfuric acid, and the 2nd step is a cyclic voltammetry sweep using potassium ferricyanide. Different cleaning methods were also considered for comparison. Consequently, after assembling and desorption of the cell and antigen, the changes in gold electrode performance, as immunosensor and cytosensor, were investigated by electrochemical impedance and cyclic voltammetry. It was found that repetitive measurement is possible until five times while maintaining the reproducibility. It is believed that this method is capable of enabling reuse of gold electrodes and can be used for long-term and accurate monitoring of biological effects, especially at a low cost.
Collapse
Affiliation(s)
- JuKyung Lee
- Department
of Medical IT Convergence, Kumoh National
Institute of Technology, Gumi, Gyeongbuk39177, Korea
| | - Han Na Suh
- Korea
Institute of Toxicology, Jeongeup, Jeollabuk-do56212, Korea
| | - Hye-bin Park
- Digital
Health Care Research Center, Gumi Electronics
and Information Technology Research Institute (GERI), Gumi, Gyeongbuk39253, Korea
| | - Yoo Min Park
- Division
of Nano-Bio sensors/Chips development, National
NanoFab Center, Daejeon34141, Korea
| | - Hyung Jin Kim
- Digital
Health Care Research Center, Gumi Electronics
and Information Technology Research Institute (GERI), Gumi, Gyeongbuk39253, Korea
| | - SangHee Kim
- Department
of Medical IT Convergence, Kumoh National
Institute of Technology, Gumi, Gyeongbuk39177, Korea
| |
Collapse
|
13
|
Krivina RA, Zlatar M, Stovall TN, Lindquist GA, Eascalera-López D, Cook AK, Hutchison JE, Cherevko S, Boettcher SW. Oxygen Evolution Electrocatalysis in Acids: Atomic Tuning of the Stability Number for Submonolayer IrO x on Conductive Oxides from Molecular Precursors. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Raina A. Krivina
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Matej Zlatar
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058 Erlangen, Germany
- Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
| | - T. Nathan Stovall
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Grace A. Lindquist
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Daniel Eascalera-López
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058 Erlangen, Germany
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, 14195 Berlin, Germany
| | - Amanda K. Cook
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - James E. Hutchison
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Serhiy Cherevko
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058 Erlangen, Germany
| | - Shannon W. Boettcher
- Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, United States
| |
Collapse
|
14
|
Ghelichkhah Z, Srinivasan R, Macdonald DD, Ferguson GS. Anion-Catalyzed Active Dissolution Model for the Electrochemical Adsorption of Bisulfate, Sulfate, and Oxygen on Gold in H2SO4 Solution. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
15
|
Go GT, Lee Y, Seo DG, Lee TW. Organic Neuroelectronics: From Neural Interfaces to Neuroprosthetics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2201864. [PMID: 35925610 DOI: 10.1002/adma.202201864] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 07/17/2022] [Indexed: 06/15/2023]
Abstract
Requirements and recent advances in research on organic neuroelectronics are outlined herein. Neuroelectronics such as neural interfaces and neuroprosthetics provide a promising approach to diagnose and treat neurological diseases. However, the current neural interfaces are rigid and not biocompatible, so they induce an immune response and deterioration of neural signal transmission. Organic materials are promising candidates for neural interfaces, due to their mechanical softness, excellent electrochemical properties, and biocompatibility. Also, organic nervetronics, which mimics functional properties of the biological nerve system, is being developed to overcome the limitations of the complex and energy-consuming conventional neuroprosthetics that limit long-term implantation and daily-life usage. Examples of organic materials for neural interfaces and neural signal recordings are reviewed, recent advances of organic nervetronics that use organic artificial synapses are highlighted, and then further requirements for neuroprosthetics are discussed. Finally, the future challenges that must be overcome to achieve ideal organic neuroelectronics for next-generation neuroprosthetics are discussed.
Collapse
Affiliation(s)
- Gyeong-Tak Go
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Yeongjun Lee
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Dae-Gyo Seo
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
- Institute of Engineering Research, Research Institute of Advanced Materials, Soft Foundry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| |
Collapse
|
16
|
Cardell C, Guerra I. Natural corrosion-induced gold nanoparticles yield purple color of Alhambra palaces decoration. SCIENCE ADVANCES 2022; 8:eabn2541. [PMID: 36083900 PMCID: PMC9462697 DOI: 10.1126/sciadv.abn2541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Despite its fame as a chemically inert noble metal, gold (alloys) may suffer degradation under specific scenarios. Here, we show evidence of electrochemically corroded gilded tin plasterwork in the Alhambra (Granada, Spain) driving spontaneously made gold nanospheres with the optimal size (ca. 70 nm) to impart purple color at the surface. Purple gold on damaged artworks is found sparsely, and its formation is not fully explained yet. We prove that our decayed gold/silver-tin ornament is due to sequential/coexisting galvanic corrosion, differential aeration corrosion, and dealloying of nonperfectly bonded and defect-based metals. Damage is enhanced by exposure to a chloride-rich atmosphere. A white gypsum coat applied during the 19th century to overlap the unaesthetic gilding assists observation of the gold-based purple color. Our work demonstrates gold dissolution, millimetric migration, physical translocation, and deposition as secondary pure gold nanospheres over a centurial time scale under natural environmental conditions.
Collapse
Affiliation(s)
- Carolina Cardell
- Department of Mineralogy and Petrology, Faculty of Science, University of Granada, Av. Fuentenueva S/N, 18071 Granada, Spain
- Corresponding author.
| | - Isabel Guerra
- Scientific Instrumentation Centre, University of Granada, Campus Universitario Fuentenueva, 18071 Granada, Spain
| |
Collapse
|
17
|
Yoo C, Yoon J, Kaium MG, Osorto B, Han SS, Kim JH, Kim BK, Chung HS, Kim DJ, Jung Y. Large-area vertically aligned 2D MoS 2layers on TEMPO-cellulose nanofibers for biodegradable transient gas sensors. NANOTECHNOLOGY 2022; 33:475502. [PMID: 35944420 DOI: 10.1088/1361-6528/ac8811] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Crystallographically anisotropic two-dimensional (2D) molybdenum disulfide (MoS2) with vertically aligned (VA) layers is attractive for electrochemical sensing owing to its surface-enriched dangling bonds coupled with extremely large mechanical deformability. In this study, we explored VA-2D MoS2layers integrated on cellulose nanofibers (CNFs) for detecting various volatile organic compound gases. Sensor devices employing VA-2D MoS2/CNFs exhibited excellent sensitivities for the tested gases of ethanol, methanol, ammonia, and acetone; e.g. a high response rate up to 83.39% for 100 ppm ethanol, significantly outperforming previously reported sensors employing horizontally aligned 2D MoS2layers. Furthermore, VA-2D MoS2/CNFs were identified to be completely dissolvable in buffer solutions such as phosphate-buffered saline solution and baking soda buffer solution without releasing toxic chemicals. This unusual combination of high sensitivity and excellent biodegradability inherent to VA-2D MoS2/CNFs offers unprecedented opportunities for exploring mechanically reconfigurable sensor technologies with bio-compatible transient characteristics.
Collapse
Affiliation(s)
- Changhyeon Yoo
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, United States of America
| | - Jaesik Yoon
- Materials Research and Education Center, 275 Wilmore Laboratory, Auburn University, Auburn, AL 36849, United States of America
| | - Md Golam Kaium
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, United States of America
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, United States of America
| | - Brandon Osorto
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, United States of America
| | - Sang Sub Han
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, United States of America
| | - Jung Han Kim
- Department of Materials Science and Engineering, Dong-A University, Busan 49315, Republic of Korea
| | - Bo Kyoung Kim
- Analytical Research Division, Korea Basic Science Institute, Jeonju 54907, Republic of Korea
| | - Hee-Suk Chung
- Analytical Research Division, Korea Basic Science Institute, Jeonju 54907, Republic of Korea
| | - Dong-Joo Kim
- Materials Research and Education Center, 275 Wilmore Laboratory, Auburn University, Auburn, AL 36849, United States of America
| | - Yeonwoong Jung
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, United States of America
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, United States of America
- Department of Electrical and Computer Engineering, University of Central Florida, Orlando, FL 32816, United States of America
| |
Collapse
|
18
|
Du J, Quinson J, Zhang D, Wang B, Wiberg GKH, Pittkowski RK, Schröder J, Simonsen SB, Kirkensgaard JJK, Li Y, Reichenberger S, Barcikowski S, Jensen KMØ, Arenz M. Nanocomposite Concept for Electrochemical In Situ Preparation of Pt-Au Alloy Nanoparticles for Formic Acid Oxidation. JACS AU 2022; 2:1757-1768. [PMID: 35911453 PMCID: PMC9327087 DOI: 10.1021/jacsau.2c00335] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Herein, we report a straightforward approach for the in situ preparation of Pt-Au alloy nanoparticles from Pt + xAu/C nanocomposites using monometallic colloidal nanoparticles as starting blocks. Four different compositions with fixed Pt content and varying Pt to Au mass ratios from 1:1 up to 1:7 were prepared as formic acid oxidation reaction (FAOR) catalysts. The study was carried out in a gas diffusion electrode (GDE) setup. It is shown that the presence of Au in the nanocomposites substantially improves the FAOR activity with respect to pure Pt/C, which serves as a reference. The nanocomposite with a mass ratio of 1:5 between Pt and Au displays the best performance during potentiodynamic tests, with the electro-oxidation rates, overpotential, and poisoning resistance being improved simultaneously. By comparison, too low or too high Au contributions in the nanocomposites lead to an unbalanced performance in the FAOR. The combination of operando small-angle X-ray scattering (SAXS), scanning transmission electron microscopy (STEM) elemental mapping, and wide-angle X-ray scattering (WAXS) reveals that for the nanocomposite with a 1:5 mass ratio, a conversion between Pt and Au from separate nanoparticles to alloy nanoparticles occurs during continuous potential cycling in formic acid. By comparison, the nanocomposites with lower Au contents, for example, 1:2, exhibit less in situ alloying, and the concomitant performance improvement is less pronounced. On applying identical location transmission electron microscopy (IL-TEM), it is revealed that the in situ alloying is due to Pt dissolution and re-deposition onto Au as well as Pt migration and coalescence with Au nanoparticles.
Collapse
Affiliation(s)
- Jia Du
- Department of Chemistry,
Biochemistry and Pharmaceutical Sciences, University of Bern, 3012 Bern, Switzerland
| | - Jonathan Quinson
- Department of Chemistry, University of
Copenhagen, 2100 Copenhagen, Denmark
- Department of Biochemical and Chemical Engineering, University of Aarhus, 8200 Aarhus, Denmark
| | - Damin Zhang
- Department of Chemistry,
Biochemistry and Pharmaceutical Sciences, University of Bern, 3012 Bern, Switzerland
| | - Baiyu Wang
- Department of Chemistry, University of
Copenhagen, 2100 Copenhagen, Denmark
| | - Gustav K. H. Wiberg
- Department of Chemistry,
Biochemistry and Pharmaceutical Sciences, University of Bern, 3012 Bern, Switzerland
| | | | - Johanna Schröder
- Department of Chemistry,
Biochemistry and Pharmaceutical Sciences, University of Bern, 3012 Bern, Switzerland
| | - Søren B. Simonsen
- Department of Energy
Conversion and Storage, Technical University
of Denmark, 2800 Lyngby, Denmark
| | - Jacob J. K. Kirkensgaard
- Department of Food
Science, University of Copenhagen, 1958 Frederiksberg, Denmark
- Niels-Bohr-Institute, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Yao Li
- Technical Chemistry I and Center of Nanointegration Duisburg Essen
(CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Sven Reichenberger
- Technical Chemistry I and Center of Nanointegration Duisburg Essen
(CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | - Stephan Barcikowski
- Technical Chemistry I and Center of Nanointegration Duisburg Essen
(CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
| | | | - Matthias Arenz
- Department of Chemistry,
Biochemistry and Pharmaceutical Sciences, University of Bern, 3012 Bern, Switzerland
| |
Collapse
|
19
|
Xu L, Ramadan S, Rosa BG, Zhang Y, Yin T, Torres E, Shaforost O, Panagiotopoulos A, Li B, Kerherve G, Kim DK, Mattevi C, Jiao LR, Petrov PK, Klein N. On-chip integrated graphene aptasensor with portable readout for fast and label-free COVID-19 detection in virus transport medium. SENSORS & DIAGNOSTICS 2022; 1:719-730. [PMID: 35923775 PMCID: PMC9280445 DOI: 10.1039/d2sd00076h] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 06/10/2022] [Indexed: 01/12/2023]
Abstract
Graphene field-effect transistor (GFET) biosensors exhibit high sensitivity due to a large surface-to-volume ratio and the high sensitivity of the Fermi level to the presence of charged biomolecules near the surface. For most reported GFET biosensors, bulky external reference electrodes are used which prevent their full-scale chip integration and contribute to higher costs per test. In this study, GFET arrays with on-chip integrated liquid electrodes were employed for COVID-19 detection and functionalized with either antibody or aptamer to selectively bind the spike proteins of SARS-CoV-2. In the case of the aptamer-functionalized GFET (aptasensor, Apt-GFET), the limit-of-detection (LOD) achieved was about 103 particles per mL for virus-like particles (VLPs) in clinical transport medium, outperforming the Ab-GFET biosensor counterpart. In addition, the aptasensor achieved a LOD of 160 aM for COVID-19 neutralizing antibodies in serum. The sensors were found to be highly selective, fast (sample-to-result within minutes), and stable (low device-to-device signal variation; relative standard deviations below 0.5%). A home-built portable readout electronic unit was employed for simultaneous real-time measurements of 12 GFETs per chip. Our successful demonstration of a portable GFET biosensing platform has high potential for infectious disease detection and other health-care applications.
Collapse
Affiliation(s)
- Lizhou Xu
- Department of Materials, Imperial College LondonLondonSW7 2AZUK,ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang UniversityHangzhou311200China
| | - Sami Ramadan
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | | | - Yuanzhou Zhang
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | - Tianyi Yin
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | - Elias Torres
- Graphenea SemiconductorPaseo Mikeletegi 83San Sebastián20009Spain
| | - Olena Shaforost
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | | | - Bing Li
- Department of Brain Sciences, Imperial College LondonLondonW12 0BZUK,Care Research & Technology Centre, UK Dementia Research InstituteW12 0BZUK,Institute for Materials Discovery, University College LondonRoberts BuildingLondonWC1E 7JEUK
| | | | - Dong Kuk Kim
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | - Cecilia Mattevi
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | - Long R. Jiao
- Department of Hepatobiliary Surgery, Division of Surgery & Cancer, Imperial College LondonHammersmith Hospital Campus, Du Cane RoadLondonW12 0NNUK
| | - Peter K. Petrov
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| | - Norbert Klein
- Department of Materials, Imperial College LondonLondonSW7 2AZUK
| |
Collapse
|
20
|
Kim HE, Kim J, Ra EC, Zhang H, Jang YJ, Lee JS. Photoelectrochemical Nitrate Reduction to Ammonia on Ordered Silicon Nanowire Array Photocathodes. Angew Chem Int Ed Engl 2022; 61:e202204117. [DOI: 10.1002/anie.202204117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Indexed: 11/05/2022]
Affiliation(s)
- Hyo Eun Kim
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jeehye Kim
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Eun Cheol Ra
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Hemin Zhang
- College of Materials Science and Engineering Sichuan University Chengdu 610065 China
| | - Youn Jeong Jang
- Department of Chemical Engineering Hanyang University Seongdong-gu Seoul 04763 Republic of Korea
| | - Jae Sung Lee
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| |
Collapse
|
21
|
Application of Mixed Potential Theory to Leaching of Mineral Phases. REACTIONS 2022. [DOI: 10.3390/reactions3020023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Leaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. Application of mixed potential theory to explain the kinetics of oxidative and reductive leaching processes is a useful concept in explaining observed results. Native metals, selected oxides, and most base metal sulfides are electron-conducting phases. For these minerals, leaching may take place by normal corrosion, passivation or galvanic couple mechanisms, which provide individual electrode kinetics enabling the calculation of mixed potentials and overall reaction kinetics. Examples of the electrochemical nature of selected leaching processes are presented and include the effect of mixed potentials, geometry, and associated kinetic reactions.
Collapse
|
22
|
Sabaté Del Río J, Woo HK, Park J, Ha HK, Kim JR, Cho YK. SEEDING to Enable Sensitive Electrochemical Detection of Biomarkers in Undiluted Biological Samples. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200981. [PMID: 35429065 DOI: 10.1002/adma.202200981] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 04/11/2022] [Indexed: 06/14/2023]
Abstract
Electrochemical biosensors have shown great potential for simple, fast, and cost-effective point-of-care diagnostic tools. However, direct analysis of complex biological fluids such as plasma has been limited by the loss of sensitivity caused by biofouling. By increasing the surface area, the nanostructured electrode can improve detection sensitivity. However, like a double-edged sword, a large surface area increases the nonspecific adsorption of contaminating proteins. The use of nanoporous structures may prevent fouling proteins. However, there is no straightforward approach for creating nanostructured and nanoporous surfaces compatible with microfabricated thin-film electrodes. Herein, the preferential etching of chloride and surfactant-assisted anisotropic gold reduction to create homogeneous, nanostructured, and nanoporous gold electrodes is demonstrated, yielding a 190 ± 20 times larger surface area within a minute without using templates. This process, "surfactant-based electrochemical etch-deposit interplay for nanostructure/nanopore growth" (SEEDING), on electrodes enhances the sensitivity and antibiofouling capabilities of amperometric biosensors, enabling direct analysis of tumor-derived extracellular vesicles (tEVs) in complex biofluids with a limit of detection of 300 tEVs µL-1 from undiluted plasma and good discrimination between patients with prostate cancer from healthy ones with an area under the curve of 0.91 in urine and 0.90 in plasma samples.
Collapse
Affiliation(s)
- Jonathan Sabaté Del Río
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Hyun-Kyung Woo
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Juhee Park
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Hong Koo Ha
- Department of Urology, Pusan National University Hospital, College of Medicine, Pusan National University, Busan, 49241, Republic of Korea
| | - Jae-Ryong Kim
- Department of Biochemistry and Molecular Biology, Smart-aging Convergence Research Center, College of Medicine, Yeungnam University, Daegu, 42415, Republic of Korea
| | - Yoon-Kyoung Cho
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| |
Collapse
|
23
|
Manring N, Ahmed MMN, Tenhoff N, Smeltz JL, Pathirathna P. Recent Advances in Electrochemical Tools for Virus Detection. Anal Chem 2022; 94:7149-7157. [PMID: 35535749 DOI: 10.1021/acs.analchem.1c05358] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Virus detection at the point-of-care facility has become an alarming topic in the research community. The latest coronavirus pandemic has highlighted the limitations of current conventional virus detection methods. Compared to nonelectrochemical sensors, electrochemical sensors provide the ideal platform for rapid, cheap, fast, sensitive, and selective diagnosis of several viruses, particularly at point-of-care facilities. This article highlights the most promising studies reported over the past decade to detect a broad spectrum of viruses using voltammetry, amperometry, and electrochemical impedance spectroscopy.
Collapse
Affiliation(s)
- Noel Manring
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
| | - Muzammil M N Ahmed
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
| | - Nicholas Tenhoff
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
| | - Jessica L Smeltz
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
| | - Pavithra Pathirathna
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
| |
Collapse
|
24
|
Kim HE, Kim J, Ra EC, Zhang H, Jang YJ, Lee JS. Photoelectrochemical Nitrate Reduction to Ammonia on Ordered Silicon Nanowire Array Photocathodes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hyo Eun Kim
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Jeehye Kim
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Eun Cheol Ra
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| | - Hemin Zhang
- College of Materials Science and Engineering Sichuan University Chengdu 610065 China
| | - Youn Jeong Jang
- Department of Chemical Engineering Hanyang University Seongdong-gu Seoul 04763 Republic of Korea
| | - Jae Sung Lee
- School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) 50 UNIST-gil Ulsan 44919 Republic of Korea
| |
Collapse
|
25
|
Lončar A, Escalera-López D, Ruiz-Zepeda F, Hrnjić A, Šala M, Jovanovič P, Bele M, Cherevko S, Hodnik N. Sacrificial Cu Layer Mediated the Formation of an Active and Stable Supported Iridium Oxygen Evolution Reaction Electrocatalyst. ACS Catal 2021; 11:12510-12519. [PMID: 34676130 PMCID: PMC8524421 DOI: 10.1021/acscatal.1c02968] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/03/2021] [Indexed: 02/03/2023]
Abstract
![]()
The production of
hydrogen via a proton-exchange membrane water
electrolyzer (PEM-WE) is directly dependent on the rational design
of electrocatalysts for the anodic oxygen evolution reaction (OER),
which is the bottleneck of the process. Here, we present a smart design
strategy for enhancing Ir utilization and stabilization. We showcase
it on a catalyst, where Ir nanoparticles are efficiently anchored
on a conductive support titanium oxynitride (TiONx) dispersed over carbon-based Ketjen Black and covered by
a thin layer of copper (Ir/CuTiONx/C),
which gets removed in the preconditioning step. Electrochemical OER
activity, stability, and structural changes were compared to the Ir-based
catalyst, where Ir nanoparticles without Cu are deposited on the same
support (Ir/TiONx/C). To study the effect
of the sacrificial less-noble metal layer on the catalytic performance
of the synthesized material, characterization methods, namely X-ray
powder diffraction, X-ray photoemission spectroscopy, and identical
location transmission electron microscopy were employed and complemented
with scanning flow cell coupled to an inductively coupled plasma mass
spectrometer, which allowed studying the online dissolution during
the catalytic reaction. Utilization of these advanced methods revealed
that the sacrificial Cu layer positively affects both Ir OER mass
activity and its durability, which was assessed via S-number, a recently
reported stability metric. Improved activity of Cu analogue was ascribed
to the higher surface area of smaller Ir nanoparticles, which are
better stabilized through a strong metal–support interaction
(SMSI) effect.
Collapse
Affiliation(s)
- Anja Lončar
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia
| | - Daniel Escalera-López
- Helmholtz-Institute Erlangen−Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Francisco Ruiz-Zepeda
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Armin Hrnjić
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia
| | - Martin Šala
- Department of Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Primož Jovanovič
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Marjan Bele
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Serhiy Cherevko
- Helmholtz-Institute Erlangen−Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Nejc Hodnik
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
- University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia
| |
Collapse
|
26
|
Zupančič U, Rainbow J, Estrela P, Moschou D. Utilising Commercially Fabricated Printed Circuit Boards as an Electrochemical Biosensing Platform. MICROMACHINES 2021; 12:mi12070793. [PMID: 34357203 PMCID: PMC8305449 DOI: 10.3390/mi12070793] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/29/2021] [Accepted: 07/01/2021] [Indexed: 11/30/2022]
Abstract
Printed circuit boards (PCBs) offer a promising platform for the development of electronics-assisted biomedical diagnostic sensors and microsystems. The long-standing industrial basis offers distinctive advantages for cost-effective, reproducible, and easily integrated sample-in-answer-out diagnostic microsystems. Nonetheless, the commercial techniques used in the fabrication of PCBs produce various contaminants potentially degrading severely their stability and repeatability in electrochemical sensing applications. Herein, we analyse for the first time such critical technological considerations, allowing the exploitation of commercial PCB platforms as reliable electrochemical sensing platforms. The presented electrochemical and physical characterisation data reveal clear evidence of both organic and inorganic sensing electrode surface contaminants, which can be removed using various pre-cleaning techniques. We demonstrate that, following such pre-treatment rules, PCB-based electrodes can be reliably fabricated for sensitive electrochemical biosensors. Herein, we demonstrate the applicability of the methodology both for labelled protein (procalcitonin) and label-free nucleic acid (E. coli-specific DNA) biomarker quantification, with observed limits of detection (LoD) of 2 pM and 110 pM, respectively. The proposed optimisation of surface pre-treatment is critical in the development of robust and sensitive PCB-based electrochemical sensors for both clinical and environmental diagnostics and monitoring applications.
Collapse
|
27
|
Strasser JW, Hersbach TJP, Liu J, Lapp AS, Frenkel AI, Crooks RM. Electrochemical Cleaning Stability and Oxygen Reduction Reaction Activity of 1‐2 nm Dendrimer‐Encapsulated Au Nanoparticles. ChemElectroChem 2021. [DOI: 10.1002/celc.202100549] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Juliette W. Strasser
- Department of Chemistry and Texas Materials Institute The University of Texas at Austin 2506 Speedway, Stop A5300 Austin TX 78712-1224, U.S.A
| | - Thomas J. P. Hersbach
- Department of Chemistry and Texas Materials Institute The University of Texas at Austin 2506 Speedway, Stop A5300 Austin TX 78712-1224, U.S.A
| | - Jing Liu
- Department of Physics Manhattan College Riverdale NY 10471 USA
| | - Aliya S. Lapp
- Department of Chemistry and Texas Materials Institute The University of Texas at Austin 2506 Speedway, Stop A5300 Austin TX 78712-1224, U.S.A
| | - Anatoly I. Frenkel
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA
- Division of Chemistry Brookhaven National Laboratory Upton NY 11973 USA
| | - Richard M. Crooks
- Department of Chemistry and Texas Materials Institute The University of Texas at Austin 2506 Speedway, Stop A5300 Austin TX 78712-1224, U.S.A
| |
Collapse
|
28
|
Immobilization of molecular catalysts on electrode surfaces using host-guest interactions. Nat Chem 2021; 13:523-529. [PMID: 33767362 DOI: 10.1038/s41557-021-00652-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 02/05/2021] [Indexed: 01/31/2023]
Abstract
Anchoring molecular catalysts on electrode surfaces combines the high selectivity and activity of molecular systems with the practicality of heterogeneous systems. Molecular catalysts, however, are far less stable than traditional heterogeneous electrocatalysts, and therefore a method to easily replace anchored molecular catalysts that have degraded could make such electrosynthetic systems more attractive. Here we applied a non-covalent 'click' chemistry approach to reversibly bind molecular electrocatalysts to electrode surfaces through host-guest complexation with surface-anchored cyclodextrins. The host-guest interaction is remarkably strong and enables the flow of electrons between the electrode and the guest catalyst. Electrosynthesis in both organic and aqueous media was demonstrated on metal oxide electrodes, with stability on the order of hours. The catalytic surfaces can be recycled by controlled release of the guest from the host cavities and the readsorption of fresh guest.
Collapse
|
29
|
Chinnaiah J, Kasian O, Dekshinamoorthy A, Vijayaraghavan S, Mayrhofer KJJ, Cherevko S, Scholz F. Tuning the Anodic and Cathodic Dissolution of Gold by Varying the Surface Roughness. ChemElectroChem 2021. [DOI: 10.1002/celc.202100366] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jeyabharathi Chinnaiah
- Electroplating & Metal Finishing Division CSIR-Central Electrochemical Research Institute Karaikudi 630 003 Tamil Nadu India
- Institute of Biochemistry University of Greifswald Felix-Hausdorff-Strasse 4 17487 Greifswald Germany
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Olga Kasian
- Department of Interface Chemistry and Surface Engineering Max-Planck-Institute of Iron Research Max-Planck-Strasse 1 40237 Düsseldorf Germany
| | - Amuthan Dekshinamoorthy
- Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute Karaikudi 630 003 Tamil Nadu India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Saranyan Vijayaraghavan
- Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute Karaikudi 630 003 Tamil Nadu India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Karl J. J. Mayrhofer
- Department of Interface Chemistry and Surface Engineering Max-Planck-Institute of Iron Research Max-Planck-Strasse 1 40237 Düsseldorf Germany
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11) Forschungszentrum Jülich Egerlandstrasse 3 91058 Erlangen Germany
- Department of Chemical and Biological Engineering, Friedrich-Alexander- Universität Erlangen-Nürnberg Egerlandstr. 3 91058 Erlangen Germany
| | - Serhiy Cherevko
- Department of Interface Chemistry and Surface Engineering Max-Planck-Institute of Iron Research Max-Planck-Strasse 1 40237 Düsseldorf Germany
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11) Forschungszentrum Jülich Egerlandstrasse 3 91058 Erlangen Germany
| | - Fritz Scholz
- Institute of Biochemistry University of Greifswald Felix-Hausdorff-Strasse 4 17487 Greifswald Germany
| |
Collapse
|
30
|
Smiljanić M, Petek U, Bele M, Ruiz-Zepeda F, Šala M, Jovanovič P, Gaberšček M, Hodnik N. Electrochemical Stability and Degradation Mechanisms of Commercial Carbon-Supported Gold Nanoparticles in Acidic Media. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:635-647. [PMID: 33488908 PMCID: PMC7818511 DOI: 10.1021/acs.jpcc.0c10033] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 12/28/2020] [Indexed: 06/12/2023]
Abstract
Electrochemical stability of a commercial Au/C catalyst in an acidic electrolyte has been investigated by an accelerated stress test (AST), which consisted of 10,000 voltammetric scans (1 V/s) in the potential range between 0.58 and 1.41 VRHE. Loss of Au electrochemical surface area (ESA) during the AST pointed out to the degradation of Au/C. Coupling of an electrochemical flow cell with ICP-MS showed that only a minor amount of gold is dissolved despite the substantial loss of gold ESA during the AST (∼35% of initial value remains at the end of the AST). According to the electrochemical mass spectrometry experiments, carbon corrosion occurs during the AST but to a minor extent. By using identical location scanning electron microscopy and identical location transmission electron microscopy, it was possible to discern that the dissolution of small Au particles (<5 nm) within the polydisperse Au/C sample is the main degradation mechanism. The mass of such particles gives only a minor contribution to the overall Au mass of the polydisperse sample while giving a major contribution to the overall ESA, which explains a significant loss of ESA and minor loss of mass during the AST. The addition of low amounts of chloride anions (10-4 M) substantially promoted the degradation of gold nanoparticles. At an even higher concentration of chlorides (10-2 M), the dissolution of gold was rather effective, which is useful from the recycling point of view when rapid leaching of gold is desirable.
Collapse
Affiliation(s)
- Milutin Smiljanić
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
- Laboratory
for Atomic Physics, Institute for Nuclear Sciences Vinča, University of Belgrade, Mike Alasa 12-14, 11001 Belgrade, Serbia
| | - Urša Petek
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
| | - Marjan Bele
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
| | - Francisco Ruiz-Zepeda
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
- Department
of Physics and Chemistry of Materials, Institute
of Metals and Technology, Lepi pot 11, 1000 Ljubljana, Slovenia
| | - Martin Šala
- Department
of Analytical Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
| | - Primož Jovanovič
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
| | - Miran Gaberšček
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna
pot 113, 1000 Ljubljana, Slovenia
| | - Nejc Hodnik
- Department
of Materials Chemistry, National Institute
of Chemistry, Hajdrihova
19, 1000 Ljubljana, Slovenia
- University
of Nova Gorica, Vipavska
13, 5000 Nova Gorica, Slovenia
| |
Collapse
|
31
|
Pfisterer JHK, Nattino F, Zhumaev UE, Breiner M, Feliu JM, Marzari N, Domke KF. Role of OH Intermediates during the Au Oxide Electro-Reduction at Low pH Elucidated by Electrochemical Surface-Enhanced Raman Spectroscopy and Implicit Solvent Density Functional Theory. ACS Catal 2020; 10:12716-12726. [PMID: 33194302 PMCID: PMC7654126 DOI: 10.1021/acscatal.0c02752] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/26/2020] [Indexed: 11/29/2022]
Abstract
![]()
Molecular understanding of the electrochemical
oxidation of metals
and the electro-reduction of metal oxides is of pivotal importance
for the rational design of catalyst-based devices where metal(oxide)
electrodes play a crucial role. Operando monitoring
and reliable identification of reacting species, however, are challenging
tasks because they require surface-molecular sensitive and specific
experiments under reaction conditions and sophisticated theoretical
calculations. The lack of molecular insight under operating conditions
is largely due to the limited availability of operando tools and to date still hinders a quick technological advancement
of electrocatalytic devices. Here, we present a combination of advanced
density functional theory (DFT) calculations considering implicit
solvent contributions and time-resolved electrochemical surface-enhanced
Raman spectroscopy (EC-SERS) to identify short-lived reaction intermediates
during the showcase electro-reduction of Au oxide (AuOx) in sulfuric
acid over several tens of seconds. The EC-SER spectra provide evidence
for temporary Au-OH formation and for the asynchronous adsorption
of (bi)sulfate ions at the surface during the reduction process. Spectral
intensity fluctuations indicate an OH/(bi)sulfate turnover period
of 4 s. As such, the presented EC-SERS potential jump approach combined
with implicit solvent DFT simulations allows us to propose a reaction
mechanism and prove that short-lived Au-OH intermediates also play
an active role during the AuOx electro-reduction in acidic media,
implying their potential relevance also for other electrocatalytic
systems operating at low pH, like metal corrosion, the oxidation of
CO, HCOOH, and other small organic molecules, and the oxygen evolution
reaction.
Collapse
Affiliation(s)
- Jonas H. K. Pfisterer
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Francesco Nattino
- Theory and Simulations of Materials (THEOS) and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Ulmas E. Zhumaev
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Manuel Breiner
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Juan M. Feliu
- Instituto de Electroquímica, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - Nicola Marzari
- Theory and Simulations of Materials (THEOS) and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Katrin F. Domke
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
32
|
Silva Olaya AR, Zandersons B, Wittstock G. Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media. ChemElectroChem 2020. [DOI: 10.1002/celc.202000923] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Birthe Zandersons
- Institute of Materials Physics and Technology Hamburg University of Technology 21073 Hamburg Germany
| | - Gunther Wittstock
- Department of Chemistry Carl von Ossietzky University of Oldenburg 26111 Oldenburg Germany
| |
Collapse
|
33
|
Speck FD, Paul MTY, Ruiz-Zepeda F, Gatalo M, Kim H, Kwon HC, Mayrhofer KJJ, Choi M, Choi CH, Hodnik N, Cherevko S. Atomistic Insights into the Stability of Pt Single-Atom Electrocatalysts. J Am Chem Soc 2020; 142:15496-15504. [PMID: 32794757 DOI: 10.1021/jacs.0c07138] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Single-atom catalysts (SACs) have quickly emerged as a new class of catalytic materials. When confronted with classical carbon-supported nanoparticulated catalysts (Pt/C), SACs are often claimed to have superior electrocatalytic properties, e.g., stability. In this study, we critically assess this statement by investigating S-doped carbon-supported Pt SACs as a representative example of noble-metal-based SACs. We use a set of complementary techniques, which includes online inductively coupled plasma mass spectrometry (online ICP-MS), identical location transmission electron microscopy (IL-TEM), and X-ray photoelectron spectroscopy (XPS). It is shown by online ICP-MS that the dissolution behavior of as-synthesized Pt SACs is significantly different from that of metallic Pt/C. Moreover, Pt SACs are, indeed, confirmed to be more stable toward Pt dissolution. When cycled to potentials of up to 1.5 VRHE, however, the dissolution profiles of Pt SACs and Pt/C become similar. IL-TEM and XPS show that this transition is due to morphological and chemical changes caused by cycling. The latter, in turn, is a consequence of the relatively poor stability of S ligands. As monitored by online ICP-MS and XPS, significant amounts of sulfur leave the catalyst during oxidation. Hence, in case catalysts with improved stability in the anodic potential region are desired, more robust supports and ligands must be developed.
Collapse
Affiliation(s)
- Florian D Speck
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse, 91058 Erlangen, Germany.,Department of Chemical and Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Michael T Y Paul
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse, 91058 Erlangen, Germany
| | - Francisco Ruiz-Zepeda
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Matija Gatalo
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Haesol Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Han Chang Kwon
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Karl J J Mayrhofer
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse, 91058 Erlangen, Germany.,Department of Chemical and Biological Engineering, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Minkee Choi
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Chang Hyuck Choi
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Nejc Hodnik
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Serhiy Cherevko
- Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy, Forschungszentrum Jülich, Egerlandstrasse, 91058 Erlangen, Germany
| |
Collapse
|
34
|
A Comparison of “Bottom-Up” and “Top-Down” Approaches to the Synthesis of Pt/C Electrocatalysts. Processes (Basel) 2020. [DOI: 10.3390/pr8080947] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Three 40 wt % Pt/C electrocatalysts prepared using two different approaches—the polyol process and electrochemical dispersion of platinum under pulse alternating current—and a commercial Pt/C catalyst (Johnson Matthey prod.) were examined via X-ray diffraction (XRD) and transmission electron microscopy (TEM). The stability characteristics of the Pt/C catalysts were studied via long-term cycling, revealing that, for all cycling modes, the best stability was achieved for the Pt/C catalyst with the largest platinum nanoparticle sizes, which was synthesized via electrochemical dispersion of platinum under pulse alternating current. Our results show that the mass and specific electrocatalytic activities of Pt/C catalysts toward ethanol electrooxidation are determined by the value of the electrochemically active Pt surface area in the catalysts.
Collapse
|
35
|
Zwaschka G, Nahalka I, Marchioro A, Tong Y, Roke S, Campen RK. Imaging the Heterogeneity of the Oxygen Evolution Reaction on Gold Electrodes Operando: Activity is Highly Local. ACS Catal 2020; 10:6084-6093. [PMID: 32551180 PMCID: PMC7295367 DOI: 10.1021/acscatal.0c01177] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/30/2020] [Indexed: 11/29/2022]
Abstract
![]()
Understanding the mechanism of the oxygen evolution reaction (OER), the oxidative half of electrolytic
water splitting, has proven challenging. Perhaps the largest hurdle
has been gaining experimental insight into the active site of the
electrocatalyst used to facilitate this chemistry. Decades of study
have clarified that a range of transition-metal oxides have particularly
high catalytic activity for the OER. Unfortunately, for virtually
all of these materials, metal oxidation and the OER occur at similar
potentials. As a result, catalyst surface topography and electronic
structure are expected to continuously evolve under reactive conditions.
Gaining experimental insight into the OER mechanism on such materials
thus requires a tool that allows spatially resolved characterization
of the OER activity. In this study, we overcome this formidable experimental
challenge using second harmonic microscopy and electrochemical methods
to characterize the spatial heterogeneity of OER activity on polycrystalline
Au working electrodes. At moderately anodic potentials, we find that
the OER activity of the electrode is dominated by <1% of the surface
area and that there are two types of active sites. The first is observed
at potentials positive of the OER onset and is stable under potential
cycling (and thus presumably extends multiple layers into the bulk
gold electrode). The second occurs at potentials negative of the OER
onset and is removed by potential cycling (suggesting that it involves
a structural motif only 1–2 Au layers deep). This type of active
site is most easily understood as the catalytically active species
(hydrous oxide) in the so-called incipient hydrous oxide/adatom mediator
model of electrocatalysis. Combining the ability we demonstrate here
to characterize the spatial heterogeneity of OER activity with a systematic
program of electrode surface structural modification offers the possibility
of creating a generation of OER electrocatalysts with unusually high
activity.
Collapse
Affiliation(s)
- Gregor Zwaschka
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Igor Nahalka
- Laboratory for Fundamental BioPhotonics, Institutes of Bioengineering (IBI) and Materials Science and Engineering (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Arianna Marchioro
- Laboratory for Fundamental BioPhotonics, Institutes of Bioengineering (IBI) and Materials Science and Engineering (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Yujin Tong
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
- Faculty of Physics, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| | - Sylvie Roke
- Laboratory for Fundamental BioPhotonics, Institutes of Bioengineering (IBI) and Materials Science and Engineering (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - R. Kramer Campen
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
- Faculty of Physics, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| |
Collapse
|
36
|
Yoo C, Kaium MG, Hurtado L, Li H, Rassay S, Ma J, Ko TJ, Han SS, Shawkat MS, Oh KH, Chung HS, Jung Y. Wafer-Scale Two-Dimensional MoS 2 Layers Integrated on Cellulose Substrates Toward Environmentally Friendly Transient Electronic Devices. ACS APPLIED MATERIALS & INTERFACES 2020; 12:25200-25210. [PMID: 32400153 DOI: 10.1021/acsami.0c06198] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We explored the feasibility of wafer-scale two-dimensional (2D) molybdenum disulfide (MoS2) layers toward futuristic environmentally friendly electronics that adopt biodegradable substrates. Large-area (> a few cm2) 2D MoS2 layers grown on silicon dioxide/silicon (SiO2/Si) wafers were delaminated and integrated onto a variety of cellulose-based substrates of various components and shapes in a controlled manner; examples of the substrates include planar papers, cylindrical natural rubbers, and 2,2,6,6-tetramethylpiperidine-1-oxyl-oxidized cellulose nanofibers. The integrated 2D layers were confirmed to well preserve their intrinsic structural and chemical integrity even on such exotic substrates. Proof-of-concept devices employing large-area 2D MoS2 layers/cellulose substrates were demonstrated for a variety of applications, including photodetectors, pressure sensors, and field-effect transistors. Furthermore, we demonstrated the complete "dissolution" of the integrated 2D MoS2 layers in a buffer solution composed of baking soda and deionized water, confirming their environmentally friendly transient characteristics. Moreover, the approaches to delaminate and integrate them do not demand any chemicals except for water, and their original substrates can be recycled for subsequent growths, ensuring excellent chemical benignity and process sustainability.
Collapse
Affiliation(s)
- Changhyeon Yoo
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Md Golam Kaium
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Luis Hurtado
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Hao Li
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States
| | - Sushant Rassay
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Jinwoo Ma
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
| | - Tae-Jun Ko
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
| | - Sang Sub Han
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
| | - Mashiyat Sumaiya Shawkat
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Electrical and Computer Engineering, University of Central Florida, Orlando, Florida 32816, United States
| | - Kyu Hwan Oh
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
| | - Hee-Suk Chung
- Analytical Research Division, Korea Basic Science Institute, Jeonju 54907, South Korea
| | - Yeonwoong Jung
- NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida 32816, United States
- Department of Electrical and Computer Engineering, University of Central Florida, Orlando, Florida 32816, United States
| |
Collapse
|
37
|
Udayan APM, Kachwala B, Karthikeyan KG, Gunasekaran S. Ultrathin quasi-hexagonal gold nanostructures for sensing arsenic in tap water. RSC Adv 2020; 10:20211-20221. [PMID: 35520415 PMCID: PMC9059146 DOI: 10.1039/d0ra02750b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 05/06/2020] [Indexed: 01/21/2023] Open
Abstract
Monodispersed colloidal gold nanoparticles (AuNPs) were synthesized by an easy, cost-effective, and eco-friendly method. The AuNPs were mostly quasi-hexagonal in shape with sizes ranging from 15 to 18 nm. A screen-printed electrode modified with AuNPs (AuNPs/SPE) was used as an electrochemical sensor for the detection of As(iii) in water samples. The mechanistic details for the detection of As(iii) were investigated and an electrochemical reaction mechanism was proposed. Under the optimal experimental conditions, the sensor was highly sensitive to As(iii), with a limit of detection of 0.11 μg L-1 (1.51 nM), which is well below the regulatory limit of 10 μg L-1 established by the United States Environmental Protection Agency and the World Health Organization. The sensor responses were highly stable, reproducible, and linear over the As(iii) concentration range of 0.075 to 30 μg L-1. The presence of co-existing heavy metal cations such as lead, copper, and mercury did not interfere with the sensor response to As(iii). Furthermore, the voltammogram peaks for As(iii), lead, copper, and mercury were sufficiently separate for their potential simultaneous measurement, and at very harsh acidic pH it may be possible to detect As(v). The AuNPs/SPE could detect As(iii) in tap water samples at near-neutral pH, presenting potential possibilities for real-time, practical applications.
Collapse
Affiliation(s)
- Anu Prathap M Udayan
- Department of Biological Systems Engineering, University of Wisconsin Madison WI 53706 USA
| | - Batul Kachwala
- Department of Biological Systems Engineering, University of Wisconsin Madison WI 53706 USA
| | - K G Karthikeyan
- Department of Biological Systems Engineering, University of Wisconsin Madison WI 53706 USA
| | - Sundaram Gunasekaran
- Department of Biological Systems Engineering, University of Wisconsin Madison WI 53706 USA
| |
Collapse
|
38
|
Dizon A, Orazem ME. On experimental determination of cell constants for interdigitated electrodes. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.135732] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
39
|
Peñaflor Galindo TG, Tagaya M. Interfacial Effect of Hydration Structures of Hydroxyapatite Nanoparticle Films on Protein Adsorption and Cell Adhesion States. ACS APPLIED BIO MATERIALS 2019; 2:5559-5567. [PMID: 35021551 DOI: 10.1021/acsabm.9b00629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesized elliptical hydroxyapatite (E-HAp) and needle-like HAp (N-HAp) nanoparticles (NPs) were electrophoretically deposited on a gold (Au) substrate. A comparative study of the hydration layers on E-HAp, N-HAp, and Au films was achieved to investigate the interfacial effect of the hydration layers on the conformation of the adsorbed fibrinogen (Fgn) and fibroblast adhesion properties. As a result, the ratios of three types of hydration layer states (free water, intermediate water, nonfreezing water) analyzed by a Fourier transform infrared (FT-IR) spectral deconvolution of the O-H stretching absorption band were investigated. The ratio of the bonding water state (i.e., intermediate and nonfreezing water molecules) is almost the same between two HAp films, and the E-HAp film with an elliptical shape and smaller particle size exhibited the smallest ratio of nonfreezing water, which can suppress the denaturation of the adsorbed protein. Subsequently, FT-IR spectral deconvolution results of the amide I band of the adsorbed Fgn on the E-HAp film indicated the higher proportion of α-helix and β-sheet structures as compared with those on the N-HAp and Au films, suggesting that the smaller proportion of nonfreezing waters would play a significant role in the stereoscopic Fgn conformation. In the culture of fibroblasts, FT-IR spectra of the adhered cells on the E-HAp, N-HAp, and Au films exhibited different absorbance intensities of the amide A, I, II, and III bands, suggesting a different amount of collagen-producing states by the cells, which were also supported by immunostaining results of the collagen type I. Therefore, the different hydration structures on the films clearly influenced the conformation of the adsorbed protein, and the preferential conformation was found at the interfaces between the fibroblasts and the underground E-HAp films.
Collapse
Affiliation(s)
- Tania Guadalupe Peñaflor Galindo
- Department of Materials Science and Technology, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka, Niigata 940-2188, Japan
| | - Motohiro Tagaya
- Department of Materials Science and Technology, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka, Niigata 940-2188, Japan
| |
Collapse
|
40
|
A quantitative evaluation of oxygen reduction and hydrogen evolution reaction contributions to Pb corrosion. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113393] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
41
|
Elusive pKa’ of aminoferrocene determined with voltammetric methods in buffered and unbuffered systems and practical aspects of such experiments. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.05.113] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
42
|
Alexe-Ionescu A, Zaccagnini P, Scalia A, Lamberti A, Tresso E, Pirri C, Barbero G. Frequency dependence of the phenomenological parameters describing adsorption processes in supercapacitors. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.05.092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
43
|
Dourado AHB, Munhos RL, Silva NA, Colle VD, Carvalho GGA, Oliveira PV, Arenz M, Varela H, Córdoba de Torresi SI. Opportunities and Knowledge Gaps of SO2 Electrocatalytic Oxidation for H2 Electrochemical Generation. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01336] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- André H. B. Dourado
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 05508-080 São Paulo, São Paulo, Brazil
| | - Renan L. Munhos
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 05508-080 São Paulo, São Paulo, Brazil
| | - Norberto A. Silva
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 05508-080 São Paulo, São Paulo, Brazil
| | - Vinícius Del Colle
- Departamento de Química, Universidade Federal de Alagoas−Campus Arapiraca, Av. Manoel Severino Barbosa, 57309-005 Arapiraca, Alagoas, Brazil
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, CEP 13560-970, São Carlos, São Paulo, Brazil
| | - Gabriel G. A. Carvalho
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 05508-080 São Paulo, São Paulo, Brazil
| | - Pedro V. Oliveira
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 05508-080 São Paulo, São Paulo, Brazil
| | - Matthias Arenz
- Department of Chemistry and Biochemistry, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Hamilton Varela
- Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, CEP 13560-970, São Carlos, São Paulo, Brazil
| | - Susana I. Córdoba de Torresi
- Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 05508-080 São Paulo, São Paulo, Brazil
| |
Collapse
|
44
|
Sharma M, Das B, Baruah MJ, Biswas S, Roy S, Hazarika A, Bhargava SK, Bania KK. Pd–Au–Y as Efficient Catalyst for C–C Coupling Reactions, Benzylic C–H Bond Activation, and Oxidation of Ethanol for Synthesis of Cinnamaldehydes. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01197] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
| | | | | | | | - Subhasish Roy
- Department of Chemistry, Indian Institute of Technology, Guwahati 781039, India
| | | | - Suresh K. Bhargava
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, G.P.O. Box 2476, Melbourne 3001, Australia
| | - Kusum K. Bania
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, G.P.O. Box 2476, Melbourne 3001, Australia
| |
Collapse
|
45
|
Trachioti MG, Tzianni EI, Riman D, Jurmanova J, Prodromidis MI, Hrbac J. Extended coverage of screen-printed graphite electrodes by spark discharge produced gold nanoparticles with a 3D positioning device. Assessment of sparking voltage-time characteristics to develop sensors with advanced electrocatalytic properties. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
46
|
Borghei YS, Hosseini M. A New Eye Dual-readout Method for MiRNA Detection based on Dissolution of Gold nanoparticles via LSPR by CdTe QDs Photoinduction. Sci Rep 2019; 9:5453. [PMID: 30931995 PMCID: PMC6443804 DOI: 10.1038/s41598-019-41898-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 03/20/2019] [Indexed: 01/27/2023] Open
Abstract
Breast cancer (BC) is the most frequent cancer that affects one in eight women worldwide. Recent advances in early cancer diagnosis anticipates more efficient treatment and prolong patient survival. MicroRNAs expression profiling plays a key role in diagnosis of cancer such as BC in early stages. For the first time we describe direct injection of hot electrons from plasmonic gold nanoparticles (AuNPs) to adsorbed water molecules with photoinduction of CdTe quantum dots (QDs) with emission wavelength at ~560 nm. As a result of hot electrons exiting from AuNPs with red color, gold cations (holes) are gradually discharged (AuNPs dissolution) leading to a colorless solution. Our group applied this phenomenon to propose a spectral method for miRNA recognition based on different responsive disaggregation and aggregation of CdTe QDs interacted with single strand DNA probes and DNA/RNA heteroduplex respectively resulting in a detection limit of 4.4 pM. This method has been applied also for the determination of miR-155 in the human breast carcinoma MCF-7 cells and normal human embryonic kidney cell line (HEK 293).
Collapse
Affiliation(s)
- Yasaman-Sadat Borghei
- Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran
| | - Morteza Hosseini
- Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran.
- Department of Pharmaceutical Biomaterials and Medicinal Biomaterials Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran.
| |
Collapse
|
47
|
Sukeri A, de Carvalho EJ, Bertotti M. A novel approach for one-step fabrication of platinum-nanoporous gold film via oxygen bubble template with enhanced electrochemical activity. Electrochem commun 2019. [DOI: 10.1016/j.elecom.2019.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
|
48
|
Kasian O, Geiger S, Mayrhofer KJJ, Cherevko S. Electrochemical On-line ICP-MS in Electrocatalysis Research. CHEM REC 2018; 19:2130-2142. [PMID: 30589199 DOI: 10.1002/tcr.201800162] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 11/20/2018] [Indexed: 01/13/2023]
Abstract
Electrocatalyst degradation due to dissolution is one of the major challenges in electrochemical energy conversion technologies such as fuel cells and electrolysers. While tendencies towards dissolution can be grasped considering available thermodynamic data, the kinetics of material's stability in real conditions is still difficult to predict and have to be measured experimentally, ideally in-situ and/or on-line. On-line inductively coupled plasma mass spectrometry (ICP-MS) is a technique developed recently to address exactly this issue. It allows time- and potential-resolved analysis of dissolution products in the electrolyte during the reaction under dynamic conditions. In this work, applications of on-line ICP-MS techniques in studies embracing dissolution of catalysts for oxygen reduction (ORR) and evolution (OER) as well as hydrogen oxidation (HOR) and evolution (HER) reactions are reviewed.
Collapse
Affiliation(s)
- Olga Kasian
- Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany
| | - Simon Geiger
- Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany.,Current address: Institute of Engineering Thermodynamics, German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569, Stuttgart, Germany
| | - Karl J J Mayrhofer
- Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany.,Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058, Erlangen, Germany.,Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058, Erlangen, Germany
| | - Serhiy Cherevko
- Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany.,Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, 91058, Erlangen, Germany
| |
Collapse
|
49
|
Effect of Particle Size on the Corrosion Behaviour of Gold in the Presence of Chloride Impurities: An EFC-ICP-MS Potentiodynamic Study. COATINGS 2018. [DOI: 10.3390/coatings9010010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A profound understanding of the Au dissolution process is a prerequisite for optimal utilization of Au-based materials. This goes for either increasing the corrosion stability of materials in the sectors where the long-term functionality of Au is needed or decreasing the corrosion stability where the recovery of the Au component is crucial. By employing an extremely sensitive online analytical system, consisting of an electrochemical flow cell coupled to an inductively coupled plasma mass spectrometry, in situ potential-resolved dissolution of Au in the ppb range is enabled. A comparative study of two Au based materials, (i) a polycrystalline Au disk and (ii) carbon-supported Au nanoparticles, is presented. As a probe, chloride ions were used to elucidate the distinct differences in the corrosion behavior of the two analogues.
Collapse
|
50
|
Guo R, Xu X, Xia Y, Huang W, Li Z, Teng B. Insights into electrocatalytic hydrogen evolution reaction in acidic medium at in-situ dispersed Pt atoms on nanoporous gold films. J Catal 2018. [DOI: 10.1016/j.jcat.2018.10.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|