1
|
Zhang L, Huang D, Yue G, Zhu J, Yang L, Yang L, Dan W, Zhao P. Effective colorimetric detection of Ni2+ using gold nanoparticles functionalized with phytate. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.139101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
2
|
Reddy C, Neelakanta Reddy I, Ravindranadh K, Raghava Reddy K, Kim D, Shim J. Ni-dopant concentration effect of ZrO2 photocatalyst on photoelectrochemical water splitting and efficient removal of toxic organic pollutants. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117352] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
3
|
Hessels J, Yu F, Detz RJ, Reek JNH. Potential- and Buffer-Dependent Catalyst Decomposition during Nickel-Based Water Oxidation Catalysis. CHEMSUSCHEM 2020; 13:5625-5631. [PMID: 32959962 PMCID: PMC7702101 DOI: 10.1002/cssc.202001428] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 09/18/2020] [Indexed: 06/11/2023]
Abstract
The production of hydrogen by water electrolysis benefits from the development of water oxidation catalysts. This development process can be aided by the postulation of design rules for catalytic systems. The analysis of the reactivity of molecular complexes can be complicated by their decomposition under catalytic conditions into nanoparticles that may also be active. Such a misinterpretation can lead to incorrect design rules. In this study, the nickel-based water oxidation catalyst [NiII (meso-L)](ClO4 )2 , which was previously thought to operate as a molecular catalyst, is found to decompose to form a NiOx layer in a pH 7.0 phosphate buffer under prolonged catalytic conditions, as indicated by controlled potential electrolysis, electrochemical quartz crystal microbalance, and X-ray photoelectron spectroscopy measurements. Interestingly, the formed NiOx layer desorbs from the surface of the electrode under less anodic potentials. Therefore, no nickel species can be detected on the electrode after electrolysis. Catalyst decomposition is strongly dependent on the pH and buffer, as there is no indication of NiOx layer formation at pH 6.5 in phosphate buffer nor in a pH 7.0 acetate buffer. Under these conditions, the activity stems from a molecular species, but currents are much lower. This study demonstrates the importance of in situ characterization methods for catalyst decomposition and metal oxide layer formation, and previously proposed design elements for nickel-based catalysts need to be revised.
Collapse
Affiliation(s)
- Joeri Hessels
- HomogeneousSupramolecular and Bio-Inspired CatalysisVan ‘t Hoff institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdam (TheNetherlands
| | - Fengshou Yu
- HomogeneousSupramolecular and Bio-Inspired CatalysisVan ‘t Hoff institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdam (TheNetherlands
| | - Remko J. Detz
- TNO Energy Transition, Energy Transition StudiesRadarweg 601043 NTAmsterdam (TheNetherlands
| | - Joost N. H. Reek
- HomogeneousSupramolecular and Bio-Inspired CatalysisVan ‘t Hoff institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdam (TheNetherlands
| |
Collapse
|
4
|
Jeon D, Park J, Shin C, Kim H, Jang JW, Lee DW, Ryu J. Superaerophobic hydrogels for enhanced electrochemical and photoelectrochemical hydrogen production. SCIENCE ADVANCES 2020; 6:eaaz3944. [PMID: 32300656 PMCID: PMC7148083 DOI: 10.1126/sciadv.aaz3944] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 01/13/2020] [Indexed: 05/24/2023]
Abstract
The efficient removal of gas bubbles in (photo)electrochemical gas evolution reactions is an important but underexplored issue. Conventionally, researchers have attempted to impart bubble-repellent properties (so-called superaerophobicity) to electrodes by controlling their microstructures. However, conventional approaches have limitations, as they are material specific, difficult to scale up, possibly detrimental to the electrodes' catalytic activity and stability, and incompatible with photoelectrochemical applications. To address these issues, we report a simple strategy for the realization of superaerophobic (photo)electrodes via the deposition of hydrogels on a desired electrode surface. For a proof-of-concept demonstration, we deposited a transparent hydrogel assembled from M13 virus onto (photo)electrodes for a hydrogen evolution reaction. The hydrogel overlayer facilitated the elimination of hydrogen bubbles and substantially improved the (photo)electrodes' performances by maintaining high catalytic activity and minimizing the concentration overpotential. This study can contribute to the practical application of various types of (photo)electrochemical gas evolution reactions.
Collapse
Affiliation(s)
- Dasom Jeon
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Jinwoo Park
- Department of Chemical Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Changhwan Shin
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
- Department of Chemical Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Hyunwoo Kim
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Ji-Wook Jang
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
- Department of Chemical Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Dong Woog Lee
- Department of Chemical Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| | - Jungki Ryu
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
- Emergent Hydrogen Technology R&D Center, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
| |
Collapse
|
5
|
Lee J, Muya JT, Chung H, Chang J. Unraveling V(V)-V(IV)-V(III)-V(II) Redox Electrochemistry in Highly Concentrated Mixed Acidic Media for a Vanadium Redox Flow Battery: Origin of the Parasitic Hydrogen Evolution Reaction. ACS APPLIED MATERIALS & INTERFACES 2019; 11:42066-42077. [PMID: 31617704 DOI: 10.1021/acsami.9b12676] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We present a mechanistic understanding of the full redox electrochemistry of V(V)-V(IV)-V(III)-V(II) and the origin of the parasitic hydrogen evolution reaction (HER) during electroreduction of either V3+ or VO2+ in a highly concentrated mixed acidic solution based on both electroanalytical and computational approaches. First, we found that the VO2+/VO2+ redox reaction is well explained by the EC/EC square scheme. We also found that V3+ is electrochemically oxidized to V4+ and subsequently undergoes a transition to stable VO2+ via hydrolysis. In the V3+/V2+ redox reaction via voltammetric analysis at scan rates greater than 0.05 V/s, the voltammograms are well explained based on a simple 1e- transfer reaction scheme. However, at the longer time scale observed in the chronoamperograms with constantly applied potentials where V3+ is electrochemically reduced to V2+, we found that a significant HER occurs because of possible formation of an electrocatalyst related to the V(II)O species, V(II)catalyst. We suggest that V(II)O is kinetically formed from V2+ via hydrolysis only when a local concentration of V2+ is high in the vicinity of a GC electrode surface, and V(II)O is adsorbed on a GC surface to form V(II)catalyst. To extend our mechanistic pathway, electroreduction of VO2+ to V(II) was also analyzed, revealing that VO2+ is electroreduced to VO+ and further reduced to VO in addition to disproportionation of VO+. Eventually, V(II)catalyst forms on a GC electrode, resulting in a significant HER. The computational calculation strongly supports the possible formation of V(II)catalyst. The calculation shows that neither V3+ nor V2+ can form stable intermediates during the HER, while V(II)O has the highest proton affinity compared with V(III)O+ and V(IV)O2+, indicating a plausible electrocatalytic property of V(II)O for the HER.
Collapse
Affiliation(s)
- Jihye Lee
- Department of Chemistry and Research Institute for Convergence of Basic Science , Hanyang University , 222 Wangsimni-ro , Seongdong-gu , Seoul 04763 , Republic of Korea
| | - Jules Tshishimbi Muya
- Department of Chemistry and Research Institute for Convergence of Basic Science , Hanyang University , 222 Wangsimni-ro , Seongdong-gu , Seoul 04763 , Republic of Korea
| | - Hoeil Chung
- Department of Chemistry and Research Institute for Convergence of Basic Science , Hanyang University , 222 Wangsimni-ro , Seongdong-gu , Seoul 04763 , Republic of Korea
| | - Jinho Chang
- Department of Chemistry and Research Institute for Convergence of Basic Science , Hanyang University , 222 Wangsimni-ro , Seongdong-gu , Seoul 04763 , Republic of Korea
| |
Collapse
|
6
|
Ray A, Roy A, Saha S, Ghosh M, Roy Chowdhury S, Maiyalagan T, Bhattacharya SK, Das S. Electrochemical Energy Storage Properties of Ni-Mn-Oxide Electrodes for Advance Asymmetric Supercapacitor Application. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8257-8267. [PMID: 31194568 DOI: 10.1021/acs.langmuir.9b00955] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, we report a facile one-spot synthesis process and the influence of compositional variation on the electrochemical performance of Ni-Mn-oxides (Ni:Mn = 1:1, 1:2, 1:3, and 1:4) for high-performance advanced energy storage applications. The crystalline structure and the morphology of these synthesized nanocomposites have been demonstrated using X-ray diffraction, field emission scanning electron microscopy, and transmission electron Microscopy. Among these materials, Ni-Mn-oxide with Ni:Mn = 1:3 possesses a large Brunauer?Emmett?Teller specific surface area (127 m2 g?1) with pore size 8.2 nm and exhibits the highest specific capacitance of 1215.5 F g?1 at a scan rate 2 mV s?1 with an excellent long-term cycling stability (?87.2% capacitance retention at 10 A g?1 over 5000 cycles). This work also gives a comparison and explains the influence of different compositional ratios on the electrochemical properties of Ni-Mn-oxides. To demonstrate the possibility of commercial application, an asymmetric supercapacitor device has been constructed by using Ni-Mn-oxide (Ni:Mn = 1:3) as a positive electrode and activated carbon (AC) as a negative electrode. This battery-like device achieves a maximum energy density of 132.3 W h kg?1 at a power density of 1651 W kg?1 and excellent coulombic efficiency of 97% over 3000 cycles at 10 A g?1.
Collapse
Affiliation(s)
| | | | | | - Monalisa Ghosh
- Instrumentation and Applied Physics , Indian Institute of Science , Bangalore 560012 , India
| | - Sreya Roy Chowdhury
- Department of Chemistry , SRM Institute of Science and Technology , Kattankulathur, Chennai 603203 , Tamil Nadu , India
| | - T Maiyalagan
- Department of Chemistry , SRM Institute of Science and Technology , Kattankulathur, Chennai 603203 , Tamil Nadu , India
| | | | | |
Collapse
|
7
|
Harris S, Gonzales J, Melaku S, Dabke RB. Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell. ACS OMEGA 2019; 4:3684-3689. [PMID: 31459581 PMCID: PMC6648549 DOI: 10.1021/acsomega.8b03141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 02/05/2019] [Indexed: 06/10/2023]
Abstract
Feasibility of performing multiple coulometric titrations in a single course of electrolysis is presented. In these titrations, three pairs of cathode and anode compartments were connected with a network of electrodes and salt bridges. Passage of current through the cell caused concurrent electrolysis in cathode and anode compartments. Electrogenerated reagents produced in these compartments were used as titrants for quantifying the analyte samples. Endpoints of the titrations were determined from the visual color change of an indicator. The charge passing through the cell was monitored and Faraday's laws of electrolysis were applied to assess the quantitative relation between the charge and analyte concentration. Experimentally determined coulombs required to titrate aqueous potassium hydrogen phthalate, MnO4 -, OH-, and S2O3 2- were 0.100, 0.466, 0.103, and 0.0934 C, respectively. These results matched with estimated values of 0.0965, 0.482, 0.0965, and 0.0965 C, respectively. Agreement between the coulombs determined from experimental results and reaction stoichiometry suggests a feasible application of concurrent coulometric titrations. Efficacy of the method was tested for determining the active ingredients in household vinegar and vitamin C dietary supplement tablets. Quantities of acetic acid and ascorbic acid in these products were 5.1% and 980 mg, respectively, agreeing with the quantities determined from volumetric titrations (5.1% and 990 mg) and manufacturer's label (5.0% and 1000 mg).
Collapse
Affiliation(s)
- Shaquithea Harris
- Department of Chemistry, Columbus State University, Columbus, Georgia 31907, United States
| | - Jaimie Gonzales
- Department of Chemistry, Columbus State University, Columbus, Georgia 31907, United States
| | - Samuel Melaku
- Department of Chemistry, Columbus State University, Columbus, Georgia 31907, United States
| | - Rajeev B. Dabke
- Department of Chemistry, Columbus State University, Columbus, Georgia 31907, United States
| |
Collapse
|
8
|
Sinclair TS, Gray HB, Müller AM. Photoelectrochemical Performance of BiVO
4
Photoanodes Integrated with [NiFe]‐Layered Double Hydroxide Nanocatalysts. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201701231] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
| | - Harry B. Gray
- Beckman Institute California Institute of Technology 91125 Pasadena CA USA
| | - Astrid M. Müller
- Beckman Institute California Institute of Technology 91125 Pasadena CA USA
| |
Collapse
|