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她喵非喵新蟲 (初入文壇)
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[求助]
請(qǐng)問如何用恒電流方法測(cè)定電化學(xué)活性表面積呢？ 已有1人參與
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請(qǐng)問如何用恒電流方法測(cè)定電化學(xué)活性表面積呢？ @Gamry-電化學(xué) 發(fā)自小木蟲手機(jī)客戶端 |
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Gamry-電化學(xué) 
金蟲 (職業(yè)作家)
- ECEPI: 3
- 應(yīng)助: 651 (博士)
- 金幣: 993.1
- 散金: 1293
- 紅花: 1275
- 帖子: 3669
- 在線: 506.2小時(shí)
- 蟲號(hào): 3437295
- 注冊(cè): 2014-09-24
- 專業(yè): 電化學(xué)
【答案】應(yīng)助回帖
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有人曾經(jīng)折磨操作過的。理論上可以去分析，假定雙電層，進(jìn)行不同方向極化電流，獲得電位，需要數(shù)據(jù)的認(rèn)真分析。 可以看一下下面這篇文獻(xiàn)，或許有幫助， 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樓2025-08-29 23:45:37
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