The synthesis of nanocrystals (NCs) with defined morphology and surface structure provides an effective way to investigate the structure-activity relationship of nanocatalytsts, and it will facilitate the design of nanocatalysts with excellent catalytic performance. In this paper, we developed a facile method to synthesize PdH_0.43 NCs with the shape of cube, octahedron and rhombic dodecahedron (RD), whose surface facets are {100}, {111} and {110}, respectively. The asprepared PdH_0.43 NCs are highly stable and exhibit enhanced catalytic activity and extremely low overpotential towards electro-oxidation of formic acid compared with the commercial Pd black and three types of Pd NCs. The specific activity of the cubic PdH_0.43 NCs is more than five times that of the commercial Pd black and two times that of the cubic Pd NCs. Among the three types of PdH_0.43 NCs with different surface structure, the activity order is followed by PdH_0.43 {100} > PdH_0.43{111} > PdH_0.43{110}.

具有确定的形态和表面结构的纳米晶体的合成为研究纳米催化剂的构效关系提供了一种有效的途径，将有助于设计具有优异催化性能的纳米催化剂。在本文中，我们开发了一种简便的方法来合成表面形状分别为{100}，{111}和{110}的立方体，八面体和菱形十二面体（RD）形状的PdH _0.43 NC。与市售的Pd黑和三种Pd NC相比，所制备的PdH _0.43 NC具有很高的稳定性，并具有增强的催化活性和极低的甲酸电氧化过电位。立方PdH的比活度为_0.43NC含量是商用Pd黑色的5倍以上，是立方Pd NC的2倍以上。在三种具有不同表面结构的PdH _0.43 NC中，活性顺序为PdH _0.43 {100}> PdH _0.43 {111}> PdH _0.43 {110}。