Au Nanowires@Pd-Polyethylenimine Nanohybrids as Highly Active and Methanol-Tolerant Electrocatalysts toward Oxygen Reduction Reaction in Alkaline Media
Au Nanowires@Pd-Polyethylenimine Nanohybrids as Highly Active and Methanol-Tolerant Electrocatalysts toward Oxygen Reduction Reaction in Alkaline Media
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DOI：
10.1021/acscatal.8b03447
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发表时间：
2018-10
期刊：
影响因子：
12.9
通讯作者：
Q. Xue;J. Bai;Cong-Cong Han-Cong;Pei Chen;Jia‐Xing Jiang;Yu Chen
中科院分区：
文献类型：
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作者：
Q. Xue;J. Bai;Cong-Cong Han-Cong;Pei Chen;Jia‐Xing Jiang;Yu Chen
优化贵金属双金属纳米结构的形状、结构和界面可显著提高其催化性能。近年来，Au@Pd核-壳双金属纳米结构在燃料电池中的应用引起了人们的极大兴趣。遗憾的是，大多数研究主要集中在形态和结构控制上，而对界面控制的研究较少。本工作以Au纳米线(Au-NWS)为晶种，采用化学还原法制备了聚乙烯亚胺(PEI)功能化Au纳米线@Pd核-壳双金属纳米杂化材料(Au-NWS@Pd@PEI)，并将其应用于碱性条件下的氧还原反应(ORR)。电化学结果表明，具有最佳组成的Au-NWS@Pd@PEI表现出比铂/碳电催化剂更高的ORR活性、选择性和耐久性。物理表征表明，Pd壳层的电子性质主要受PEI聚合物的影响，而不受Au-NWS核的影响。R.。
Optimizing the shape, structure, and interface of noble metal bimetallic nanostructures significantly improves their catalytic properties. Recently, Au@Pd core–shell bimetallic nanostructures have attracted considerable interest for fuel cell applications. Regrettably, most of the research mainly focuses on the morphological and structural control whereas interfacial control is neglected. In this work, polyethylenimine (PEI) functionalized Au nanowires@Pd core–shell bimetallic nanohybrids (Au-NWs@Pd@PEI) are synthesized by a chemical reduction method using Au nanowires (Au-NWs) as seeds in the presence of PEI and demonstrate their application toward oxygen reduction reaction (ORR) in an alkaline solution. Electrochemical results display that Au-NWs@Pd@PEI with optimal component shows enhanced ORR activity, selectivity, and durability compared to Pt/C electrocatalyst. Physical characterizations demonstrate that the electronic property of Pd shell mainly is affected by PEI polymer rather than Au-NWs core. R...