The variation of the three-dimensional(3D)structure of the membrane electrode of a fuel cell during proton exchange cycling involves the corrosion/compaction of the carbon support.The increasing degra-dation of the carbon structure continuously reduces the electrocatalytic performance of proton exchange membrane fuel cells(PEM-FCs).This phenomenon can be explained by performing 3D tomographic anal-ysis at the nanoscale.However,conventional tomographic approaches which present limited experimen-tal feasibility,cannot perform such evaluation and have not provided sufficient structural information with statistical significance thus far.Therefore,a reliable methodology is required for the 3D geometrical evaluation of the carbon structure.Here,we propose a segmented tomographic approach which employs pore network analysis that enables the visualization of the geometrical parameters corresponding to the porous carbon structure at a high resolution.This approach can be utilized to evaluate the 3D structural degradation of the porous carbon structure after cycling in terms of local surface area,pore size distribu-tion,and their 3D networking.These geometrical parameters of the carbon body were demonstrated to be substantially reduced owing to the cycling-induced degradation.This information enables a deeper understanding of the degradation phenomenon of carbon supports and can contribute to the develop-ment of stable PEM-FC electrodes.

Jung A.Hong;Min-Hyoung Jung;Sung Yong Cho;Eun-Byeol Park;Daehee Yang;Young-Hoon Kim;Sang-Hyeok Yang;Woo-Sung Jang;Jae Hyuck Jang;Hyo June Lee;Sungchul Lee;Hu Young Jeong;Young-Min Kim

Department of Energy Science,Sungkyunkwan University(SKKU),Suwon 16419,Republic of Korea;Fuel Cell Core Parts Development Cell,Hyundai Mobis Co.Ltd.,Uiwang 16082,Republic of Korea;Electron Microscopy&Spectroscopy Team,Korea Basic Science Institute(KBSI),Daejeon 34133,Republic of Korea;Graduate School of Semiconductor Materials and Devices Engineering,Ulsan National Institute of Science and Technology(UNIST),Ulsan 44919,Republic of Korea

能源化学

[1]Jung A.Hong;Min-Hyoung Jung;Sung Yong Cho;Eun-Byeol Park;Daehee Yang;Young-Hoon Kim;Sang-Hyeok Yang;Woo-Sung Jang;Jae Hyuck Jang;Hyo June Lee;Sungchul Lee;Hu Young Jeong;Young-Min Kim-.Segmented tomographic evaluation of structural degradation of carbon support in proton exchange membrane fuel cells)[J].能源化学,2022(11):359-367

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