期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 168, 期 12, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac3d02
关键词
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资金
- Helmholtz project Solar Hydrogen
- Bundesministerium fur Wirtschaft und Energie [BMWi 03ETB005E]
The deconvolution of physicochemical processes in impedance spectra of SOCs with nickel/ceria fuel electrodes was challenging due to strong overlap of gas diffusion with electrochemical processes. By using symmetrical cells and altering components in fuel gas mixture, an effective gas transport parameter was derived for precise quantification of gas diffusion-related polarization resistances. Model validation in fuel cell and electrolyzer mode showed excellent agreement between measured and simulated current/voltage characteristics under various gas compositions and temperatures.
The deconvolution of physicochemical processes in impedance spectra of SOCs with nickel/ceria fuel electrodes is challenging as gas diffusion strongly overlaps with the electrochemical processes at fuel and air electrode. To overcome this issue, symmetrical cells were applied and the gas diffusion process at the fuel electrode was quantified by altering the inert component (nitrogen/helium) in a ternary fuel gas mixture. An effective gas transport parameter considering microstructural and geometrical features was derived, enabling a precise quantification of polarization resistances related to gas diffusion and hydrogen electrooxidation. The obtained values were applied to parameterize a dc cell model. The model validation in fuel cell and electrolyzer mode showed an excellent agreement between measured and simulated current/voltage characteristics over a wide range of technically meaningful gas compositions and operating temperatures.
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