Highly active nanostructured palladium-ceria electrocatalysts for the hydrogen oxidation reaction in alkaline medium
Highly active nanostructured palladium-ceria electrocatalysts for the hydrogen oxidation reaction in alkaline medium
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DOI：
10.1016/j.nanoen.2017.01.051
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发表时间：
2017-03-01
期刊：
影响因子：
17.6
通讯作者：
Dekel, Dario R.
中科院分区：
文献类型：
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作者：
Miller, Hamish A.;Vizza, Francesco;Dekel, Dario R.
我们报道了一类有趣的新型双功能电催化剂，Pd/C-CeO2，在碱性条件下具有良好的氢氧化反应(HOR)活性和稳定性。沉积在Vulcan XC-72碳和CeO2混合载体上的钯的独特结构由Pd金属组成，最好是沉积在催化剂的CeO2区域。CeO2-Pd的相互作用增强了HOR动力学，增加了稳定性。在这里，我们比较了三种不同Pd负载量的催化剂，发现10wt%Pd的样品具有最优的活性。基于该催化剂的氢泵和燃料电池实验表明，与不含CeO2的Pd/C样品相比，该催化剂具有更高的活性。金属溶解实验和同位透射显微镜实验表明，与Pd/C相比，该材料在碱性介质中的苛刻电位循环实验下的稳定性显著提高，是用于阴离子交换膜燃料电池HOR的高活性和高稳定的电催化剂之一。
We report an interesting new class of bifunctional electrocatalysts, Pd/C-CeO2, with excellent activity and stability for the hydrogen oxidation reaction (HOR) under alkaline conditions. The unique structure of palladium deposited onto a mixed support of Vulcan XC-72 carbon and CeO2 consists of Pd metal preferable deposited on the ceria regions of the catalyst. The CeO2-Pd interaction leads to enhanced HOR kinetics and increased stability. Here we compare catalysts with three different Pd loadings and show that the 10 wt% Pd sample has optimized activity. Hydrogen pumping and fuel cell experiments based on this catalyst show higher activities as compared to a Pd/C sample without ceria. Metal dissolution tests and identical location transmission microscopy experiments show that the catalyst stability under harsh potential cycling experiments in alkaline medium is significantly improved as compared to Pd/C, making this material one of the best options for use as highly active and highly stable electrocatalysts for the HOR in anion exchange membrane fuel cells.