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请问如何用恒电流方法测定电化学活性表面积呢？ 已有1人参与
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请问如何用恒电流方法测定电化学活性表面积呢？ @Gamry-电化学 发自小木虫手机客户端 |
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【答案】应助回帖
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有人曾经折磨操作过的。理论上可以去分析，假定双电层，进行不同方向极化电流，获得电位，需要数据的认真分析。 可以看一下下面这篇文献，或许有帮助， Development of a galvanostatic analysis technique as an in-situ diagnostic tool for PEMFC single cells and stacks Kug-Seung Lee, Byung-Seok Lee, Sung Jong Yoo, Soo-Kil Kim, Seung Jun Hwang, Hyung-Juhn Kim, EunAe Cho, Dirk Henkensmeier, Jeong Woo Yun, Suk Woo Nam, Tae-Hoon Lim, Jong Hyun Jang, Development of a galvanostatic analysis technique as an in-situ diagnostic tool for PEMFC single cells and stacks, International Journal of Hydrogen Energy, Volume 37, Issue 7, 2012, Pages 5891-5900, ISSN 0360-3199, https://doi.org/10.1016/j.ijhydene.2011.12.152. (https://www.sciencedirect.com/sc ... /S0360319911028862) Abstract: A new galvanostatic analysis technique was developed for PEMFC single cells and stacks, while conventional potentiodynamic techniques, such as cyclic voltammetry for an electrochemical active surface area (EAS) and linear sweep voltammetry for a crossover current (iH2), cannot be directly utilized for stacks. Using a developed relationship for double-layer charging region, the iH2 and Cdl (double-layer capacitance) of a PEMFC single cell could be determined from the galvanostatic data under an atmosphere of nitrogen (cathodes) and hydrogen (anodes). Then, simply from the elapsed time in hydrogen adsorption/desorption region, EAS or roughness factors could be analyzed for a PEMFC single cell. For a 5-cell PEMFC stack, it was experimentally confirmed that the same analysis technique can be applied to analyze performance distribution in PEMFC stacks. As the characteristics of catalyst layers (EAS and Cdl) and polymer electrolyte membranes (iH2) of individual cells can be analyzed without stack disassembly, the developed galvanostatic technique is expected to be utilized for the degradation study and performance monitoring of practical PEMFC stacks. Keywords: Galvanostatic measurement; PEMFC stack diagnosis; Electrochemical active surface area; Pt catalyst; Hydrogen crossover current |
2楼2025-08-29 23:45:37