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Ogada J, Ehirim TJ, Ipadeola AK, Haruna AB, Mwonga PV, Abdullah AM, Yang XY, Eid K, Wamwangi DM, Ozoemena KI. Interfacial Electronic Interactions within the Pd-CeO 2/Carbon Onions Define the Efficient Electrocatalytic Ethanol Oxidation Reaction in Alkaline Electrolytes. ACS OMEGA 2024; 9:7439-7451. [PMID: 38405481 PMCID: PMC10882676 DOI: 10.1021/acsomega.3c04427] [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: 06/21/2023] [Revised: 09/24/2023] [Accepted: 09/27/2023] [Indexed: 02/27/2024]
Abstract
Porous Pd-based electrocatalysts are promising materials for alkaline direct ethanol fuel cells (ADEFCs) and ethanol sensors in the development of renewable energy and point-of-contact ethanol sensor test kits for drunk drivers. However, experimental and theoretical investigations of the interfacial interaction among Pd nanocrystals on supports (i.e., carbon black (CB), onion-like carbon (OLC), and CeO2/OLC) toward ADEFC and ethanol sensors are not yet reported. This is based on the preparation of Pd-CeO2/OLC nanocrystals by the sol-gel and impregnation methods. Evidently, the porous Pd-CeO2/OLC significantly increased membrane-free micro-3D-printed ADEFC performance with a high peak power density (Pmax = 27.15 mW cm-2) that is 1.38- and 7.58-times those of Pd/OLC (19.72 mW cm-2) and Pd/CB (3.59 mW cm-2), besides its excellent stability for 48 h. This is due to the excellent interfacial interaction among Pd, CeO2, and OLC, evidenced by density functional theory (DFT) simulations that showed a modulated Pd d-band center and facile active oxygenated species formation by the CeO2 needed for ethanol fuel cells. Similarly, Pd-CeO2/OLC gives excellent sensitivity (0.00024 mA mM-1) and limit of detection (LoD = 8.7 mM) for ethanol sensing and satisfactory recoveries (89-108%) in commercial alcoholic beverages (i.e., human serum, Amstel beer, and Nederberg Wine). This study shows the excellent possibility of utilizing Pd-CeO2/OLC for future applications in fuel cells and alcohol sensors.
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Affiliation(s)
- Jimodo
J. Ogada
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- School
of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Tobechukwu J. Ehirim
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Adewale K. Ipadeola
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- Gas
Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
- Center
for Advanced Materials, Qatar University, Doha 2713, Qatar
| | - Aderemi B. Haruna
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Patrick V. Mwonga
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | | | - Xiao-Yu Yang
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Kamel Eid
- Gas
Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Daniel M. Wamwangi
- School
of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Kenneth I. Ozoemena
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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2
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Ipadeola AK, Abdelgawad A, Salah B, Abdullah AM, Eid K. Interfacial Engineering of Porous Pd/M (M = Au, Cu, Mn) Sponge-like Nanocrystals with a Clean Surface for Enhanced Alkaline Electrochemical Oxidation of Ethanol. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:13830-13840. [PMID: 37724885 DOI: 10.1021/acs.langmuir.3c01285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
The interfacial engineering of Pd-based alloys (i.e., PdM with distinct morphologies, compositions, and strain defects) is an efficient way for enhanced catalytic activity; however, it remains a grand challenge to fabricate such alloys in aqueous solutions without heating, organic solvents, and multiple reaction steps. Herein, we present a simple, aqueous-phase, one-step, and ultrafast approach for the interfacial engineering of surfactant-free porous PdM (M = Cu, Au, and Mn) nanocrystals with well-controlled spongy-like morphology and compositions. The electronic interaction in PdM nanocrystals and their effect on the alkaline electrochemical ethanol oxidation reaction (EOR) are investigated using XRD, XPS, and electrochemical tests. Notably, integrating M metals into Pd atoms results in upshifting the d-band center of Pd and subsequently modulating the EOR activity and stability substantially. The EOR mass activity (10.78 A/mgPd (6.93 A/mgPdCu)) of PdCu was 1.83, 3.09, 4.51, and 53.90 times higher than those of AuPd (5.90 A/mgPd (3.27 A/mgAuPd)), PdMn (3.48 A/mgPd (3.19 A/mgPdMn)), Pd (2.39 A/mgPd), and Pd/C (0.20 A/mgPd), respectively, besides substantial durability after 1000 cycles. This is due to the porous two-dimensional morphology, a low synergetic effect, higher interfacial interaction, and greater active surface area of PdCu, besides a high Cu content with more oxophilicity that facilitates activation/dissociation of H2O to generate -OH species needed for quick EOR electrocatalysis. The electrochemical impedance spectroscopy (EIS) reveals better electrolyte/electrode interfacial interaction and lower charge transfer resistance on PdCu. The EOR activity of PdCu porous sponge-like nanocrystals was superior to all previously reported Pd-based alloys for electrochemical EOR. This study indicates that binary Pd-based catalysts with less synergetic effect are preferred for boosting the EOR activity, which could help in manipulating the surface properties of Pd-based alloys to optimize EOR performance.
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Affiliation(s)
- Adewale K Ipadeola
- Center for Advanced Materials, Qatar University, Doha 2713, Qatar
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Ahmed Abdelgawad
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Belal Salah
- Center for Advanced Materials, Qatar University, Doha 2713, Qatar
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | | | - Kamel Eid
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
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3
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Peteni S, Ozoemena OC, Khawula T, Haruna AB, Rawson FJ, Shai LJ, Ola O, Ozoemena KI. Electrochemical Immunosensor for Ultra-Low Detection of Human Papillomavirus Biomarker for Cervical Cancer. ACS Sens 2023. [PMID: 37384904 PMCID: PMC10391710 DOI: 10.1021/acssensors.3c00677] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
Human papillomavirus (HPV) is the causative agent for cervical cancer. Of the various types of HPV, the high-risk HPV-16 type is the most important antigenic high-risk HPV. In this work, the antigenic HPV-16 L1 peptide was immobilized on a glassy carbon electrode and used to detect several concentrations of the anti-HPV-16 L1 antibody, and vice versa. Two electrode platforms were used: onion-like carbon (OLC) and its polyacrylonitrile (OLC-PAN) composites. Both platforms gave a wide linear concentration range (1.95 fg/mL to 6.25 ng/mL), excellent sensitivity (>5.2 μA/log ([HPV-16 L1, fg/mL]), and extra-ordinarily low limit of detection (LoD) of 1.83 fg/mL (32.7 aM) and 0.61 fg/mL (10.9 aM) for OLC-PAN and OLC-based immunosensors, respectively. OLC-PAN modified with the HPV-16 L1 protein showed low LoD for the HPV-16 L1 antibody (2.54 fg/mL, i.e., 45.36 aM), proving its potential use for screening purposes. The specificity of detection was proven with the anti-ovalbumin antibody (anti-OVA) and native ovalbumin protein (OVA). An immobilized antigenic HPV-16 L1 peptide showed insignificant interaction with anti-OVA in contrast with the excellent interaction with anti-HPV-16 L1 antibody, thus proving high specificity. The application of the immunosensor as a potential point-of-care (PoC) diagnostic device was investigated with screen-printed carbon electrodes, which detected ultra-low (ca. 0.7 fg/mL ≈ 12.5 aM) and high (ca. 12 μg/mL ≈ 0.21 μM) concentrations. This study represents the lowest LoD reported for HPV-16 L1. It opens the door for further investigation with other electrode platforms and realization of PoC diagnostic devices for screening and testing of HPV biomarkers for cervical cancer.
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Affiliation(s)
- Siwaphiwe Peteni
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Okoroike C Ozoemena
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Tobile Khawula
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Aderemi B Haruna
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Frankie J Rawson
- School of Pharmacy, Biodiscovery Institute University of Nottingham, Nottingham NG7 2RD, U.K
| | - Leshweni J Shai
- Department of Biomedical Sciences, Tshwane University of Technology, Pretoria 0001, South Africa
| | - Oluwafunmilola Ola
- Advanced Materials Group, Faculty of Engineering, The University of Nottingham, Nottingham NG7 2RD, U.K
| | - Kenneth I Ozoemena
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
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Javanshiri-Ghasemabadi J, Sadeghi S. Facile fabrication of an electrochemical sensor for the determination of two sulfonamide antibiotics in milk, honey and water samples using effective modification of carbon paste electrode with graphitic carbon nitride and manganese oxide nanostructures. J Food Compost Anal 2023. [DOI: 10.1016/j.jfca.2023.105294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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5
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Ehirim T, Ozoemena OC, Mwonga PV, Haruna AB, Mofokeng TP, De Wael K, Ozoemena KI. Onion-like Carbons Provide a Favorable Electrocatalytic Platform for the Sensitive Detection of Tramadol Drug. ACS OMEGA 2022; 7:47892-47905. [PMID: 36591171 PMCID: PMC9798499 DOI: 10.1021/acsomega.2c05722] [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: 09/03/2022] [Accepted: 10/17/2022] [Indexed: 06/17/2023]
Abstract
This work reports the first study on the possible application of nanodiamond-derived onion-like carbons (OLCs), in comparison with conductive carbon black (CB), as an electrode platform for the electrocatalytic detection of tramadol (an important drug of abuse). The physicochemical properties of OLCs and CB were determined using X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and thermogravimetric analysis (TGA). The OLC exhibits, among others, higher surface area, more surface defects, and higher thermal stability than CB. From the electrochemical analysis (interrogated using cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy), it is shown that an OLC-modified glassy carbon electrode (GCE-OLC) allows faster electron transport and electrocatalysis toward tramadol compared to a GCE-CB. To establish the underlying science behind the high performance of the OLC, theoretical calculations (density functional theory (DFT) simulations) were conducted. DFT predicts that OLC allows for weaker surface binding of tramadol (E ad = -26.656 eV) and faster kinetic energy (K.E. = -155.815 Ha) than CB (E ad = -40.174 eV and -305.322 Ha). The GCE-OLC shows a linear calibration curve for tramadol over the range of ∼55 to 392 μM, with high sensitivity (0.0315 μA/μM) and low limit of detection (LoD) and quantification (LoQ) (3.8 and 12.7 μM, respectively). The OLC-modified screen-printed electrode (SPE-OLC) was successfully applied for the sensitive detection of tramadol in real pharmaceutical formulations and human serum. The OLC-based electrochemical sensor promises to be useful for the sensitive and accurate detection of tramadol in clinics, quality control, and routine quantification of tramadol drugs in pharmaceutical formulations.
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Affiliation(s)
- Tobechukwu
J. Ehirim
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg2050, South Africa
| | - Okoroike C. Ozoemena
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg2050, South Africa
| | - Patrick V. Mwonga
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg2050, South Africa
| | - Aderemi B. Haruna
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg2050, South Africa
| | - Thapelo P. Mofokeng
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg2050, South Africa
| | - Karolien De Wael
- A-Sense
Lab, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020Antwerp, Belgium
- NANOlab
Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020Antwerp, Belgium
| | - Kenneth I. Ozoemena
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg2050, South Africa
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6
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Zhang HJ, Zou X, Chen WY, Sun Q, Gao EQ. A Cu-functionalized MOF and multi-walled carbon nanotube composite modified electrode for the simultaneous determination of hydroquinone and catechol. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:3961-3969. [PMID: 36173377 DOI: 10.1039/d2ay01230h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Designing MOF-based materials with desired electrochemical activity and high electron conductivity may yield a novel electrochemical sensor that effectively detects various organic pollutants and conducts health monitoring. This study developed a facile and versatile electrochemical sensor for simultaneously monitoring the environmental pollutants hydroquinone (HQ) and catechol (CT). The electrodes are fabricated by modifying a GCE with a Cu-functionalized MOF (UiO-bpydc-Cu) and multi-walled carbon nanotubes (MWCNTs). The Cu-functionalized MOF effectively improved the electronic conductivity by metalating the 2,2'-bipyridyl-derived UiO-bpydc with Cu2+ ions. Moreover, due to the synergic effect, the composite electrode exhibits a significant voltammetric response to HQ's and CT's electro-redox. A rapid and sensitive method of synchronously detecting HQ and CT has been established by differential pulse voltammetry (DPV). The experiments reveal that the linear response ranges were 0.5-565 μM and 1-1350 μM for HQ and CT, respectively, with low detection limits of 0.361 μM and 0.245 μM. The proposed UiO-bpydc-Cu/MWCNTs/GCE electrochemical sensor shows high sensitivity, good anti-interference, reproducibility, and stability. It can also be applied for detecting HQ and CT in actual samples.
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Affiliation(s)
- Hong-Jing Zhang
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China.
| | - Xin Zou
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China.
| | - Wen-Yi Chen
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China.
| | - Qian Sun
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China.
| | - En-Qing Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, P. R. China
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7
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Microwave irradiation suppresses the Jahn-Teller distortion in Spinel LiMn2O4 cathode material for lithium-ion batteries. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Ogada JJ, Ipadeola AK, Mwonga PV, Haruna AB, Nichols F, Chen S, Miller HA, Pagliaro MV, Vizza F, Varcoe JR, Meira DM, Wamwangi DM, Ozoemena KI. CeO 2 Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01863] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jimodo J. Ogada
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Adewale K. Ipadeola
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Patrick V. Mwonga
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Aderemi B. Haruna
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Forrest Nichols
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Hamish A. Miller
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Maria V. Pagliaro
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Francesco Vizza
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - John R. Varcoe
- Department of Chemistry, University of Surrey, Guildford, Surrey GU2 7XH, U.K
| | - Debora Motta Meira
- CLS@APS Sector 20, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States
- Canadian Light Source Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Daniel M. Wamwangi
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Kenneth I. Ozoemena
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
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9
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Haruna A, Mwonga P, Barrett D, Rodella CB, Forbes RP, Venter A, Sentsho Z, Fletcher PJ, Marken F, Ozoemena KI. Defect-Engineered β-MnO 2-δ Precursors Control the Structure-Property Relationships in High-Voltage Spinel LiMn 1.5Ni 0.5O 4-δ. ACS OMEGA 2021; 6:25562-25573. [PMID: 34632213 PMCID: PMC8495857 DOI: 10.1021/acsomega.1c03656] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 08/18/2021] [Indexed: 06/13/2023]
Abstract
This study examines the role of defects in structure-property relationships in spinel LiMn1.5Ni0.5O4 (LMNO) cathode materials, especially in terms of Mn3+ content, degree of disorder, and impurity phase, without the use of the traditional high-temperature annealing (≥700 °C used for making disordered LMNO). Two different phases of LMNO (i.e., highly P4332-ordered and highly Fd3̅m-disordered) have been prepared from two different β-MnO2-δ precursors obtained from an argon-rich atmosphere (β-MnO2-δ (Ar)) and a hydrogen-rich atmosphere [β-MnO2-δ (H2)]. The LMNO samples and their corresponding β-MnO2-δ precursors are thoroughly characterized using different techniques including high-resolution transmission electron microscopy, field-emission scanning electron microscopy, Raman spectroscopy, powder neutron diffraction, X-ray photoelectron spectroscopy, synchrotron X-ray diffraction, X-ray absorption near-edge spectroscopy, and electrochemistry. LMNO from β-MnO2-δ (H2) exhibits higher defects (oxygen vacancy content) than the one from the β-MnO2-δ (Ar). For the first time, defective β-MnO2-δ has been adopted as precursors for LMNO cathode materials with controlled oxygen vacancy, disordered phase, Mn3+ content, and impurity contents without the need for conventional methods of doping with metal ions, high synthetic temperature, use of organic compounds, postannealing, microwave, or modification of the temperature-cooling profiles. The results show that the oxygen vacancy changes concurrently with the degree of disorder and Mn3+ content, and the best electrochemical performance is only obtained at 850 °C for LMNO-(Ar). The findings in this work present unique opportunities that allow the use of β-MnO2-δ as viable precursors for manipulating the structure-property relationships in LMNO spinel materials for potential development of high-performance high-voltage lithium-ion batteries.
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Affiliation(s)
- Aderemi
B. Haruna
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Patrick Mwonga
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Dean Barrett
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Cristiane B. Rodella
- Brazilian
Synchrotron Light Laboratory (LNLS/Brazilian Center of Energy and
Materials) (CNPEM), Campinas 13083-970, São Paulo, Brazil
| | - Roy P. Forbes
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Andrew Venter
- Research
and Technology Development Division, Necsa
(South African Nuclear Energy Corporation) SOC Limited, Pelindaba, Pretoria 0001, South Africa
| | - Zeldah Sentsho
- Research
and Technology Development Division, Necsa
(South African Nuclear Energy Corporation) SOC Limited, Pelindaba, Pretoria 0001, South Africa
| | - Philip J. Fletcher
- Materials
and Chemical Characterization Facility (MC), University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | - Frank Marken
- Materials
and Chemical Characterization Facility (MC), University of Bath, Claverton Down, Bath BA2 7AY, U.K.
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA27AY, U.K.
| | - Kenneth I. Ozoemena
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
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10
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Ozoemena OC, Ehirim TJ, Khawula T, Makgopa K, Shai LJ, Ozoemena KI. Bovine Serum Albumin-Dependent Charge-Transfer Kinetics Controls the Electrochemical Immunosensitive Detection: Vibrio cholerae as a Model Bioanalyte. Electrocatalysis (N Y) 2021; 12:595-604. [PMID: 34122666 PMCID: PMC8187457 DOI: 10.1007/s12678-021-00673-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/26/2021] [Indexed: 11/25/2022]
Abstract
This work investigates how bovine serum albumin (BSA), a commonly used protein in the fabrication of electrochemical immunosensors, can impact on the sensitivity of detection when integrated with antibody (Ab) pre-encapsulated with (i) insulating polyacrylonitrile (PAN) fibre (i.e., GCE-PAN-Ab-BSA immunosensor) or (ii) conducting PAN-grafted iron (II) phthalocyanine (FePc) (i.e., GCE-PAN@FePc-Ab-BSA immunosensor), using Vibrio cholerae toxin as a case study bioanalyte. Both immunosensors show different charge-transfer kinetics that strongly impact on their immunosensitive detection. From the electrochemical data, GCE-PAN-Ab-BSA is more insulating with the presence of BSA, while the GCE-PAN@FePc-Ab-BSA is more conducting with BSA. The CV of the GCE-PAN-Ab-BSA is dominated by radial diffusion process, while that of the GCE-PAN@FePc-Ab-BSA is planar diffusion process. The behaviour of GCE-PAN@FePc-Ab-BSA has been associated with the facile coordination of BSA and FePc that permits co-operative charge-transport of the redox probe, while that of the GCE-PAN-Ab-BSA is related to the interaction-induced PAN-BSA insulating state that suppresses charge-transport. As a consequence of these different interaction processes, GCE-PAN-Ab-BSA immunosensor provides higher electroanalytical performance for the detection of Vibrio cholerae toxin (with sensitivity of 16.12 Ω/log [VCT, g/mL] and limit of detection (LoD) of 3.20 × 10-13 g/mL compared to those of the GCE-PAN@FePc-Ab-BSA (4.16 Ω/log (VCT, g mL-1) and 2.00 × 10-12 g/mL). The study confirms the need for a thorough understanding of the physico-chemistries of the electrode platforms for the construction of immunosensors. Although this work is on immunosensors for cholera infection, it may well apply to other immunosensors. GRAPHICAL ABSTRACT
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Affiliation(s)
- Okoroike C. Ozoemena
- Department of Biomedical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, 0001 South Africa
| | - Tobechukwu J. Ehirim
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, 2050 South Africa
| | - Tobile Khawula
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, 2050 South Africa
| | - Katlego Makgopa
- Department of Chemistry, Faculty of Science, Tshwane University of Technology, Pretoria, 0001 South Africa
| | - Leshweni J. Shai
- Department of Biomedical Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, 0001 South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, 2050 South Africa
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11
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Ipadeola AK, Mwonga PV, Ray SC, Maphanga RR, Ozoemena KI. Palladium/Stannic Oxide Interfacial Chemistry Promotes Hydrogen Oxidation Reactions in Alkaline Medium. ChemElectroChem 2020. [DOI: 10.1002/celc.202000952] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Patrick V. Mwonga
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Sekar C. Ray
- Department of Physics University of South Africa, Florida Campus Johannesburg 1709 South Africa
| | - Rapela R. Maphanga
- Next Generation Enterprises and Institutions Council for Scientific and Industrial Research (CSIR) P.O. Box 395 Pretoria 0001 South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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Mofokeng T, Ipadeola AK, Tetana ZN, Ozoemena KI. Defect-Engineered Nanostructured Ni/MOF-Derived Carbons for an Efficient Aqueous Battery-Type Energy Storage Device. ACS OMEGA 2020; 5:20461-20472. [PMID: 32832799 PMCID: PMC7439376 DOI: 10.1021/acsomega.0c02563] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 07/07/2020] [Indexed: 05/20/2023]
Abstract
A Ni-based metal-organic framework (Ni-MOF) has been synthesized using a microwave-assisted strategy and converted to nanostructured Ni/MOF-derived mesoporous carbon (Ni/MOFDC) by carbonization and acid treatment (AT-Ni/MOFDC). The materials are well characterized with Raman, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer-Emmett-Teller (BET), revealing that chemical etching confers on the AT-Ni/MOFDC-reduced average nanoparticle size (high surface area) and structural defects including oxygen vacancies. AT-Ni/MOFDC displays low series resistances and a higher specific capacity (C s) of 199 mAh g-1 compared to Ni/MOFDC (92 mAh g-1). This study shows that the storage mechanism of the Ni-based electrode as a battery-type energy storage (BTES) system can be controlled by both non-faradic and faradic processes and dependent on the sweep rate or current density. AT-Ni/MOFDC reveals mixed contributions at different rates: 75.2% faradic and 24.8% non-faradic contributions at 5 mV s-1, and 34.1% faradic and 65.9% non-faradic at 50 mV s-1. The full BTES device was assembled with AT-Ni/MOFDC as the cathode and acetylene black (AB) as the anode. Compared to recent literature, the AT-Ni/MOFDC//AB BTES device exhibits high energy (33 Wh kg-1) and high power (983 W kg-1) with excellent cycling performance (about 88% capacity retention over 2000 cycles). This new finding opens a window of opportunity for the rational designing of next-generation energy storage devices, supercapatteries, that combine the characteristics of batteries (high energy) and supercapacitors (high power).
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Affiliation(s)
- Thapelo
Prince Mofokeng
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South
Africa
- DSI-NRF
Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3,
PO Wits, Johannesburg 2050, South Africa
| | - Adewale Kabir Ipadeola
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South
Africa
| | - Zikhona Nobuntu Tetana
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South
Africa
- DSI-NRF
Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3,
PO Wits, Johannesburg 2050, South Africa
| | - Kenneth Ikechukwu Ozoemena
- Molecular
Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South
Africa
- DSI-NRF
Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3,
PO Wits, Johannesburg 2050, South Africa
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13
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Ozoemena O, Maphumulo T, Shai JL, Ozoemena KI. Electrospun Carbon Nanofibers as an Electrochemical Immunosensing Platform for Vibrio cholerae Toxin: Aging Effect of the Redox Probe. ACS OMEGA 2020; 5:5762-5771. [PMID: 32226855 PMCID: PMC7097905 DOI: 10.1021/acsomega.9b03820] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Accepted: 02/18/2020] [Indexed: 06/01/2023]
Abstract
An electrochemical immunosensor for Vibrio cholerae toxin (VCT) has been developed using electrospun carbon nanofibers (CNFs) as the electrode platform. To fabricate the immunosensor, the anti-cholera toxin antibody (Ab) was covalently immobilized on the electrode platforms using the carbodiimide chemistry for the amide bond formation. Every step of the formation of the immunosensor and the subsequent binding of the VCT subunit antigen (Ag) was electrochemically interrogated. The immunosensor gave excellent reproducibility and sensitivities: limits of detection (ca. 1.2 × 10-13 g mL-1), limits of quantification (ca. 1.3 × 10-13 g mL-1), and a wide linear range for the anti-cholera detection of 8 orders of magnitude (10-13 to 10-5 g mL-1). One of the key findings was the enhanced sensitivity of the VCT detection using aged rather than the freshly prepared redox probe, described here as Redox Probe Aging-Induced Sensitivity Enhancement ("Redox-PrAISE"). The Redox-PrAISE was found more useful in the real application of these immunosensors, showing comparable or even better sensitivity for eight real cholera-infested water samples than the conventional clinical culture method. This immunosensor shows promise for the potential development of point-of-care diagnosis of VCT. Importantly, this study highlights the importance of considering the nature of the redox probe on the electrochemical sensing conditions when designing impedimetric immunosensors.
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Affiliation(s)
- Okoroike
C. Ozoemena
- Department
of Biomedical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
- Department
of Chemistry, University of Pretoria, Pretoria 0002, South Africa
| | - Tobile Maphumulo
- Molecualr
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Jerry L. Shai
- Department
of Biomedical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
| | - Kenneth I. Ozoemena
- Department
of Chemistry, University of Pretoria, Pretoria 0002, South Africa
- Molecualr
Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
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Lv TT, Zou ZG, Li YW, Li SY, Zhang YJ. Hydrothermal synthesis of high specific capacity Al/Na co-doped V6O13 cathode material for lithium-ion battery. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.09.057] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Barbero G, Lelidis I. Analysis of Warburg's impedance and its equivalent electric circuits. Phys Chem Chem Phys 2017; 19:24934-24944. [DOI: 10.1039/c7cp04032f] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The analogy between a transmission line and an electrolytic cell is not physically grounded.
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Affiliation(s)
- G. Barbero
- Dipartimento di Scienza Applicata e Tecnologia
- Politecnico di Torino
- 10129 Torino
- Italy
- Moscow Engineering Physics Institute (MEPhI)
| | - I. Lelidis
- Dipartimento di Scienza Applicata e Tecnologia
- Politecnico di Torino
- 10129 Torino
- Italy
- Faculty of Physics
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16
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Reduced Graphene Oxide/Manganese Carbonate Hybrid Composite: High Performance Supercapacitor Electrode Material. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.09.130] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Gong Y, Hao Z, Meng J, Shi H, Jiang P, Zhang M, Lin J. Two CoIIMetal-Organic Frameworks Based on a Multicarboxylate Ligand as Electrocatalysts for Water Splitting. Chempluschem 2013; 79:266-277. [DOI: 10.1002/cplu.201300334] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Indexed: 11/07/2022]
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18
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Balogun MO, Huws EH, Sirhan MM, Saleh AD, Dulayymi JRA, Pilcher L, Verschoor JA, Baird MS. Thiol modified mycolic acids. Chem Phys Lipids 2013; 172-173:40-55. [DOI: 10.1016/j.chemphyslip.2013.03.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 03/21/2013] [Accepted: 03/23/2013] [Indexed: 11/30/2022]
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19
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Gong Y, Shi HF, Hao Z, Sun JL, Lin JH. Two novel Co(ii) coordination polymers based on 1,4-bis(3-pyridylaminomethyl)benzene as electrocatalysts for oxygen evolution from water. Dalton Trans 2013; 42:12252-9. [DOI: 10.1039/c3dt50697e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Synthesis, characterisation and electrochemical intercalation kinetics of nanostructured aluminium-doped Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material for lithium ion battery. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.08.074] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Ramulifho T, Ozoemena KI, Modibedi RM, Jafta CJ, Mathe MK. Fast microwave-assisted solvothermal synthesis of metal nanoparticles (Pd, Ni, Sn) supported on sulfonated MWCNTs: Pd-based bimetallic catalysts for ethanol oxidation in alkaline medium. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2011.10.071] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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22
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Mamuru SA, Ozoemena KI, Fukuda T, Kobayashi N, Nyokong T. Studies on the heterogeneous electron transport and oxygen reduction reaction at metal (Co, Fe) octabutylsulphonylphthalocyanines supported on multi-walled carbon nanotube modified graphite electrode. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.06.056] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Zhang Z, Pen Y, Edyvean RG, Banwart SA, Dalgliesh RM, Geoghegan M. Adhesive and conformational behaviour of mycolic acid monolayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1798:1829-39. [DOI: 10.1016/j.bbamem.2010.05.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2010] [Revised: 05/25/2010] [Accepted: 05/28/2010] [Indexed: 10/19/2022]
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Pillay J, Ozoemena KI, Tshikhudo RT, Moutloali RM. Monolayer-protected clusters of gold nanoparticles: impacts of stabilizing ligands on the heterogeneous electron transfer dynamics and voltammetric detection. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9061-9068. [PMID: 20496956 DOI: 10.1021/la904463g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Surface electrochemistry of novel monolayer-protected gold nanoparticles (MPCAuNPs) is described. Protecting ligands, (1-sulfanylundec-11-yl)tetraethylene glycol (PEG-OH) and (1-sulfanylundec-11-yl)poly(ethylene glycol)ic acid (PEG-COOH), of three different percent ratios (PEG-COOH:PEG-OH), 1:99 (MPCAuNP-COOH(1%)), 50:50 (MPCAuNP-COOH(50%)), and 99:1 (MPCAuNP-COOH(99%)), were studied. The electron transfer rate constants (k(et)/s(-1)) in organic medium decreased as the concentration of the surface-exposed -COOH group in the protecting monolayer ligand is increased: MPCAuNP-COOH(1%) (approximately 5 s(-1)) > MPCAuNP-COOH(50%) (approximately 4 s(-1)) > MPCAuNP-COOH(99%) (approximately 0.5 s(-1)). In aqueous medium, the trend is reversed. The surface pK(a) was estimated as approximately 8.2 for the MPCAuNP-COOH(1%), while both MPCAuNP-COOH(50%) and MPCAuNP-COOH(99%) showed two pK(a) values of about 5.0 and approximately 8.0. These results have been interpreted in terms of the quasi-solidity and quasi-liquidity of the terminal -OH and -COOH head groups, respectively. MPCAuNP-COOH(99%) excellently suppressed the voltammetric response of the ascorbic acid but enhanced the electrocatalytic detection of epinephrine compared to the other MPCAuNPs studied. This study reveals important factors that should be considered when designing electrode devices that employ monolayer-protected gold nanoparticles and possibly for some other redox-active metal nanoparticles.
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Affiliation(s)
- Jeseelan Pillay
- Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa
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Mamuru SA, Ozoemena KI, Fukuda T, Kobayashi N. Iron(ii) tetrakis(diaquaplatinum)octacarboxyphthalocyanine supported on multi-walled carbon nanotube platform: an efficient functional material for enhancing electron transfer kinetics and electrocatalytic oxidation of formic acid. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm02210a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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