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Oxygen reduction reaction on carbon-supported palladium nanocubes in alkaline media

机译:碱性介质中碳载钯纳米立方体的氧还原反应

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摘要

Carbon-supported Pd nanocubes with the size of 30, 10 and 7 nm were prepared and their electrocatalytic activity towards the oxygen reduction reaction (ORR) in alkaline solution was studied. For comparison carbon-supported spherical Pd nanoparticles and commercial Pd/C catalyst were used. The catalysts were characterised by transmission electron microscopy, electro-oxidation of carbon monoxide and cyclic voltammetry and the ORR activity was evaluated using the rotating disk electrode method. The ORR on all studied Pd/C catalysts proceeded via four-electron pathway where the rate-limiting step was the transfer of the first electron to O2 molecule. The specific activity of Pd nanocubes was more than two times higher than that of spherical Pd nanoparticles and increased with increasing the particle size.
机译:制备了碳负载的Pd纳米晶,其尺寸分别为30、10和7nm,并研究了它们在碱性溶液中对氧还原反应(ORR)的电催化活性。为了进行比较,使用了碳负载球形Pd纳米颗粒和商用Pd / C催化剂。通过透射电子显微镜,一氧化碳的电氧化和循环伏安法对催化剂进行表征,并使用转盘电极法评价ORR活性。所有研究的Pd / C催化剂上的ORR均通过四电子途径进行,其中限速步骤是将第一电子转移至O2分子。 Pd纳米粒子的比活度比球形Pd纳米粒子高两倍以上,并且随着粒径的增加而增加。

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