Identification of electrode degradation by carbon corrosion in polymer electrolyte membrane fuel cells using the distribution of relaxation time analysis

Kwon, JunHwa; Choi, Pilsoo; Jo, Seunghyun; Oh, Hyunjun; Cho, Ki-Yeop; Lee, Younki; Kim, Subin; Eom, KwangSup

doi:10.1016/j.electacta.2022.140219

Cited by 20 publications

(3 citation statements)

References 42 publications

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“…Furthermore, we performed DRT analysis of the EIS spectrum to deconvolute the time-dependent evolution of various interfacial processes (charge transfer, adsorption, and formation of surface oxide film) in Figure . DRT has been used to study solid oxide fuel cell processes, − kinetics of lithium-ion batteries, and solid–liquid electrochemical interfaces of metals with the electrolyte . The time-resolved element makes DRT a powerful tool for identifying specific surface events that can be correlated with the EIS equivalent circuit.…”

Section: Resultsmentioning

confidence: 99%

Understanding Localized Corrosion on Metal Surfaces Using Scanning Electrochemical Cell Impedance Microscopy (SECCIM)

et al. 2022

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Understanding the electrochemical properties at a localized scale is critically important to comprehend the origin of corrosion and develop multifunctional materials with robust corrosion resistance, particularly at conjoined metal interfaces typically encountered in automobile manufacturing. Scanning electrochemical cell microscopy (SECCM) is an emerging technique which enables to study the corrosion of metal surfaces to be visualized at the microscopic level. In this work, we developed scanning electrochemical cell impedance microscopy (SECCIM) by combining SECCM with electrochemical impedance spectroscopy (EIS) and explored the unique advantages of using SECCIM to measure the corrosion kinetics on single-crystal Mg (0001) as the model surface using direct current and alternating current polarization techniques. Specifically, a theta capillary with a tip diameter of 10 μm filled with a 0.01 M NaCl electrolyte was used as a probe to perform spatially resolved potentiodynamic Tafel polarization and EIS. The combination of traditional SECCM with EIS led to the development of SECCIM and enabled us to study small interfacial events such as charge transfer, adsorption, and emergence of resistive oxide films on the surface using the distribution of relaxation time analysis. Furthermore, by comparing localized SECCIM measurements with bulk electrochemical measurements, we establish the reliability of SECCIM for the mapping of corrosion potential and associated charge-transfer resistance on the Mg (0001) surface. Our results indicate that SECCIM measurement with Tafel and EIS analysis will provide an unparalleled ability to characterize the pitting corrosion mechanism on the heterogeneous surface of mixed-metal alloys and metal joints.

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Section: Resultsmentioning

confidence: 99%

Understanding Localized Corrosion on Metal Surfaces Using Scanning Electrochemical Cell Impedance Microscopy (SECCIM)

et al. 2022

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“…The adjacent peaks P3 to P5 also depended strongly on humidity rather than current density or oxygen partial pressure, which supported that these processes are related to proton transport. Kwon et al [34] identified the carbon corrosion by DRT, peak area decrease and the negative shift in the characteristic relaxation time (t 0 ) can be observed during the initial 1k cycling, representing the decrease in charge transfer resistance. A remarkable negative shift oft 0 showed in the 30k cycling.…”

Section: Eismentioning

confidence: 99%

A Review of Polymer Electrolyte Fuel Cells Fault Diagnosis: Progress and Perspectives

Zhou,

Jervis

2023

Chemistry Methods

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Polymer electrolyte fuel cells (PEFCs) are regarded as a substitution for the combustion engine with high energy conversion efficiency and zero CO2 emissions. Stable system operation requires control within a relatively narrow range of operating conditions to achieve the optimal output, leading to faults that can easily cause accelerated degradation when operating conditions deviate from the control targets. Performance recovery of the system can be realized through early fault diagnosis; therefore, accurate and effective diagnostic characterisation is vital for long‐term serving. A review of off‐line and on‐line techniques applied to the fault diagnosis of fuel cells is presented in this work. Off‐line approaches include electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), galvanostatic charge (GSC), visualisation‐based and image‐based techniques; the on‐line methods can be divided into model‐based, data‐driven, signal‐based and hybrid methods. Since each methodology has advantages and drawbacks, its effectiveness is analysed, and limitations are highlighted.

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“…Polymer electrolyte membrane fuel cells (PEMFCs) are typical substances that produce electricity from chemical energy [1][2][3]. Among the components of PEMFCs, the most practical electro catalysts are carbon-supported Pt catalysts, due to their having the highest activity in the oxygen reduction reaction (ORR) [4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

An Efficient Electrocatalyst (PtCo/C) for the Oxygen Reduction Reaction

et al. 2022

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The oxygen reduction reaction (ORR) is paid much more attention because of the high overpotential required for driving the four-electron process in the field of storage and sustainable energy conversion, including fuel cell applications. In this paper, PtCo nanoparticles encapsulated on carbon supports were prepared by a simple modified polyol method with ethylene glycol. Structural as well as electrochemical characterizations illustrated that the PtCo/C electrocatalysts had a minimum particle size of 4.8 nm, which is close to the commercial 40 wt% Pt/JM. Moreover, the electrochemical measurements indicated that ORR activity was competitive with the commercial 40 wt% Pt/JM catalyst. The synthesis method is a critical way to produce PtCo/C catalysts for use in polymer electrolyte membranes in fuel cells (PEMFCs).

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Identification of electrode degradation by carbon corrosion in polymer electrolyte membrane fuel cells using the distribution of relaxation time analysis

Cited by 20 publications

References 42 publications

Understanding Localized Corrosion on Metal Surfaces Using Scanning Electrochemical Cell Impedance Microscopy (SECCIM)

Understanding Localized Corrosion on Metal Surfaces Using Scanning Electrochemical Cell Impedance Microscopy (SECCIM)

A Review of Polymer Electrolyte Fuel Cells Fault Diagnosis: Progress and Perspectives

An Efficient Electrocatalyst (PtCo/C) for the Oxygen Reduction Reaction

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