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Cheng L, Jin R, Jiang D, Zhuang J, Liao X, Zheng Q. Scanning Electrochemical Cell Microscopy Platform with Local Electrochemical Impedance Spectroscopy. Anal Chem 2021; 93:16401-16408. [PMID: 34843214 DOI: 10.1021/acs.analchem.1c02972] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Local electrochemical impedance spectroscopy (LEIS) has been a versatile technology for characterizing local complex electrochemical processes at heterogeneous surfaces. However, further application of this technology is restricted by its poor spatial resolution. In this work, high-spatial-resolution LEIS was realized using scanning electrochemical cell microscopy (SECCM-LEIS). The spatial resolution was proven to be ∼180 nm based on experimental and simulation results. The stability and reliability of this platform were further verified by long-term tests and Kramers-Kronig transformation. With this technology, larger electric double-layer capacitance (Cdl) and smaller interfacial resistance (Rt) were observed at the edges of N-doped reduced graphene oxide, as compared to those at the planar surface, which may be due to the high electrochemical activity at the edges. The established SECCM-LEIS provides a high-spatial approach for study of the interfacial electrochemical behavior of materials, which can contribute to the elucidation of the electrochemical reaction mechanism at material surfaces.
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Affiliation(s)
- Lei Cheng
- Key Laboratory of Education Ministry for Modern Design Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, P.R. China.,School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China
| | - Rong Jin
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, P.R. China
| | - Dechen Jiang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, P.R. China
| | - Jian Zhuang
- Key Laboratory of Education Ministry for Modern Design Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, P.R. China.,School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China
| | - Xiaobo Liao
- Key Laboratory of Education Ministry for Modern Design Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, P.R. China.,School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China.,Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, P.R. China
| | - Qiangqiang Zheng
- Key Laboratory of Education Ministry for Modern Design Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, P.R. China.,School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China
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Interaction mechanism of lead ions with stibnite surfaces and enhancement of xanthate adsorption. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115802] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sangeetha T, Yan WM, Chen PT, Yang CJ, Huang KD. Electrochemical polarization analysis for optimization of external operation parameters in zinc fuel cells. RSC Adv 2020; 10:28807-28818. [PMID: 35520036 PMCID: PMC9055878 DOI: 10.1039/d0ra04454g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 07/07/2020] [Indexed: 11/21/2022] Open
Abstract
Zinc-air flow fuel cells utilizing zinc particles as fuel possess the potential to evolve as efficient distributed grid generators. In this research study, electrochemical impedance analysis was employed to determine the optimum design and operational parameters for the feasible maneuver and enhanced energy generation from zinc fuel cells. Polarization resistance (R p), ohmic resistance (R s), and mass transfer resistance (R m) were used as the indicators for determination of the optimum parameters of fuel cell performance. Experimental conditions optimized from previous studies like potassium hydroxide electrolyte with temperature of 25 °C and concentration of 40 wt% zinc powder quantity of 20 g, electrode reaction surface area of 48 cm2 were followed in the fuel cells used in the present study. Parameters like collector plate material, air flow velocity and cell operating temperature were augmented and finally were all implemented in the fuel cell and operated. Plain nickel or nickel-plated copper were both advantageous as collector plate materials whereas an air flow velocity ranging from 1-3 m s-1 and a cell operating temperature of 25 °C to 45 °C were beneficial for the stability and performance of the zinc fuel cells. Finally, based on the optimized parameters obtained from the above experiments, performance tests of zinc fuel cells were investigated. The maximum power produced was 16.5 W, along with a corresponding voltage of 0.8 V, maximum current density of 430 mA cm-2 and peak power density of 364.6 mW cm-2. Thus it can be concluded that the fuel cells designed and operated in this study were capable for feasible and efficient future applications.
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Affiliation(s)
- Thangavel Sangeetha
- Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology Taipei 10608 Taiwan.,Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology Taipei 10608 Taiwan
| | - Wei-Mon Yan
- Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology Taipei 10608 Taiwan.,Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology Taipei 10608 Taiwan
| | - Po-Tuan Chen
- Department of Vehicle Engineering, National Taipei University of Technology Taipei Taiwan
| | - Cheng-Jung Yang
- Program in Interdisciplinary Studies, National Sun Yat-sen University Kaohsiung 80424 Taiwan
| | - K David Huang
- Department of Vehicle Engineering, National Taipei University of Technology Taipei Taiwan
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The impact of air humidity on the operation of proton exchange membrane fuel cells determined using dynamic electrochemical impedance spectroscopy. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zielinski A, Cieslik M, Sobaszek M, Bogdanowicz R, Darowicki K, Ryl J. Multifrequency nanoscale impedance microscopy (m-NIM): A novel approach towards detection of selective and subtle modifications on the surface of polycrystalline boron-doped diamond electrodes. Ultramicroscopy 2019; 199:34-45. [DOI: 10.1016/j.ultramic.2019.01.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 12/10/2018] [Accepted: 01/21/2019] [Indexed: 01/25/2023]
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Heterogeneous oxidation of highly boron-doped diamond electrodes and its influence on the surface distribution of electrochemical activity. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.12.050] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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