The School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.
State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China.
Nanoscale. 2017 Jan 19;9(3):1279-1284. doi: 10.1039/c6nr06646a.
Dendritic nanostructures are capturing increasing attention in electrocatalysis owing to their unique structural features and low density. Herein, we report for the first time, bromide ion mediated synthesis of low Pt-content PdCuPt ternary nanodendrites via galvanic replacement reaction between a Pt precursor and a PdCu template in aqueous solution. The experimental results show that the ternary PdCuPt nanodendrites present enhanced electrocatalytic performance for oxygen reduction reaction in acid solution compared with commercial Pt/C as well as some state-of-the-art catalysts. In detail, the mass activity of the PdCuPt catalyst with optimized composition is 1.73 A mg at 0.85 V vs. RHE, which is 14 times higher than that of a commercial Pt/C catalyst. Moreover, the long-term stability test demonstrates its better durability in acid solution. After 5k cycles, there is still 70% electrochemical surface area maintained. This method provides an efficient method to synthesize trimetallic alloys with controllable composition and specific structure for oxygen reduction reaction.
树枝状纳米结构由于其独特的结构特征和低密度，在电催化中受到越来越多的关注。本文首次报道了溴化物离子介导的通过在水溶液中电置换反应，在 Pt 前体和 PdCu 模板之间合成低 Pt 含量的 PdCuPt 三元纳米树枝状结构。实验结果表明，与商业 Pt/C 以及一些最先进的催化剂相比，三元 PdCuPt 纳米树枝状结构在酸性溶液中对氧还原反应具有增强的电催化性能。具体来说，具有最佳组成的 PdCuPt 催化剂的质量活性在 0.85 V 相对于 RHE 下为 1.73 A mg，是商业 Pt/C 催化剂的 14 倍。此外，长期稳定性测试表明其在酸性溶液中具有更好的耐久性。经过 5000 个循环后，仍保持 70%的电化学表面积。该方法为氧还原反应提供了一种高效的方法来合成具有可控组成和特定结构的三元合金。
