College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , P. R. China.
Langmuir. 2018 Jul 10;34(27):7981-7988. doi: 10.1021/acs.langmuir.8b01729. Epub 2018 Jun 29.
Well-defined noble metal nanomaterials are attractive as catalysts for various applications because of abundant surface-active sites. However, the shape-controlled synthesis of high-performance Pt-based nanocatalysts remains a forbidden challenge. We herein demonstrate a versatile approach for realizing the systemically controlled syntheses of bimetallic Pt-Cu nanocrystals (NCs) from concave nanocubes (CNCs), to excavated nanocubes, to tripods via simply switching the amount of glycine (reducing agent). These Pt-Cu nanostructures supply a desirable platform for carrying out the structure-dependent electrocatalytic studies in the liquid fuel electro-oxidation. Impressively, all of the Pt-Cu NCs show high activity and outstanding durability for alcohol oxidation. In particular, the Pt-Cu CNCs display unprecedent high activity toward MOR and EOR, which are found to be 2041.1 and 5760.9 mA mg in mass activity, 7.9- and 11.5-folds greater than the commercial Pt/C catalysts, respectively, showing a promising class of electrocatalysts for fuel cells. This work sheds great promise for optimizing the electrochemical catalysis by precisely modulating the structure of catalysts.
具有明确边界的贵金属纳米材料因其具有丰富的表面活性位点而成为各种应用的有吸引力的催化剂。然而，高性能 Pt 基纳米催化剂的形状控制合成仍然是一个具有挑战性的难题。在此，我们展示了一种通用的方法，可以从凹面纳米立方体（CNC）到挖掘出的纳米立方体再到三脚架，通过简单地切换甘氨酸（还原剂）的量，实现双金属 Pt-Cu 纳米晶体（NC）的系统控制合成。这些 Pt-Cu 纳米结构为在液体燃料电氧化中进行结构依赖性电催化研究提供了一个理想的平台。令人印象深刻的是，所有的 Pt-Cu NCs 都表现出对醇氧化的高活性和出色的耐久性。特别是，Pt-Cu CNCs 对 MOR 和 EOR 表现出前所未有的高活性，其质量活性分别高达 2041.1 和 5760.9 mA mg，分别是商业 Pt/C 催化剂的 7.9 倍和 11.5 倍，为燃料电池展示了一类有前途的电催化剂。这项工作通过精确调节催化剂的结构，为优化电化学催化提供了很大的希望。
