Self-templated construction of 1D NiMo nanowires via a Li electrochemical tuning method for the hydrogen evolution reaction
Self-templated construction of 1D NiMo nanowires via a Li electrochemical tuning method for the hydrogen evolution reaction
复制标题
通过锂电化学调谐方法自模板构建一维 NiMo 纳米线用于析氢反应
作者：
Huang Dekang;Li Shu;Luo Yanzhu;Liao Li;Ye Jinhua;Chen Hao
NiMo基材料已被广泛认为是碱性电解质中用于析氢反应的贵Pt电催化剂的最有前途的替代品。然而，通过电化学方法构建NiMo材料的纳米结构，特别是一维形貌是困难的。在此，一种新的锂电化学调谐方法，首次引入，通过插入到母体NiMoO 4纳米棒的锂离子合成一维NiMo纳米线。如此制备的NiMo催化剂在1 M KOH中表现出高HER活性，在10 mA cm-2的电流密度下具有低过电位（73 mV）和小的塔菲尔斜率（37.2 mV dec-1）和电荷转移电阻（11.3 Ω）。此外，当该材料在-0.125 V（vs. RHE）下运行1250 min时，没有观察到催化性能的衰减，并且实现了高法拉第效率（96%）。NiMo催化剂的高活性主要归因于Ni和Mo之间的协同作用以及其独特的纳米结构，可以暴露更多的活性中心，促进传质和氢气泡释放。
NiMo based materials have been widely recognized as the most promising alternatives to noble Pt electrocatalysts used in alkaline electrolytes for the hydrogen evolution reaction. However, it is difficult to construct a nanostructure, especially 1D morphology, for NiMo materials via an electrochemical method. Herein, a novel Li electrochemical tuning method, for the first time, is introduced to synthesize 1D NiMo nanowires by insertion of lithium ions into parent NiMoO4 nanorods. The as-prepared NiMo catalyst exhibits high HER activity in 1 M KOH, in terms of low overpotential (73 mV) at a current density of 10 mA cm−2 and a small Tafel slope (37.2 mV dec−1) and charge transfer resistance (11.3 Ω). Furthermore, no decay in catalytic performance is observed for this material when it is operated at −0.125 V (vs. RHE) for 1250 min and a high Faraday efficiency (96%) is achieved. The high activity of NiMo is ascribed to the synergistic interplay between Ni and Mo and its unique nanostructure, which can expose more active sites and facilitate the mass transfer and hydrogen bubble release.