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首页> 外文期刊>Electrocatalysis >First Insight into Fluorinated Pt/Carbon Aerogels as More Corrosion-Resistant Electrocatalysts for Proton Exchange Membrane Fuel Cell Cathodes
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First Insight into Fluorinated Pt/Carbon Aerogels as More Corrosion-Resistant Electrocatalysts for Proton Exchange Membrane Fuel Cell Cathodes

机译：氟化铂/碳气凝胶作为质子交换膜燃料电池阴极的更耐腐蚀的电催化剂的首次见解

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摘要

This study evaluates the fluorination of a carbon aerogel and gives first insights into its durability when used as platinum electrocatalyst substrate for proton exchange membrane fuel cell (PEMFC) cathodes. Fluorine has been introduced before or after platinum deposition. The different electrocatalysts are physico-chemically and electrochemically characterized, and the results discussed by comparison with commercial Pt/XC72 from E-Tek. The results demonstrate that the level of fluorination of the carbon aerogel can be controlled. The fluorination modifies the texture of the carbons by increasing the pore size and decreasing the specific surface area, but the textures remain appropriate for PEMFC applications. Two fluorination sites are observed, leading to both high covalent C-F bonds and weakened ones, the quantity of which depends on whether the treatment is done before or after platinum deposition. The order of the different treatments is very important. Indeed, the presence of platinum contributes to the fluorination mechanism, but leads to amorphous platinum, which is demonstrated rather inactive towards the oxygen reduction reaction. On the contrary, a better durability was demonstrated for the fluorinated and then platinized catalyst compared both to the same but not fluorinated catalyst and to the reference commercial material (based on the loss of the electrochemical real surface area after accelerated stress tests).
机译：这项研究评估了碳气凝胶的氟化作用，并当其用作质子交换膜燃料电池（PEMFC）阴极的铂电催化剂基材时，首次了解了其耐久性。在铂沉积之前或之后已经引入了氟。对不同的电催化剂进行了物理化学和电化学表征，并通过与E-Tek的商用Pt / XC72进行了比较讨论了结果。结果表明，可以控制碳气凝胶的氟化水平。氟化通过增加孔径和减小比表面积来改变碳的质地，但是质地仍然适合于PEMFC应用。观察到两个氟化位点，导致高共价C-F键和弱化键，其数量取决于处理是在铂沉积之前还是之后进行。不同处理的顺序非常重要。确实，铂的存在有助于氟化机理，但是会导致非晶态的铂，这被证明对氧还原反应相当无活性。相反，与相同但未氟化的催化剂和参比商业材料相比，氟化然后铂化的催化剂都具有更好的耐久性（基于加速应力测试后电化学实际表面积的损失）。

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