Qi Junlei, Xu Tianxiong, Cao Jian, Guo Shu, Zhong Zhengxiang, Feng Jicai
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
Nanoscale. 2020 Mar 14;12(10):6204-6210. doi: 10.1039/c9nr10240j. Epub 2020 Mar 5.
Proper vacancy engineering is considered as a promising strategy to improve intrinsic activity, but it is challenging to construct rich vacancies by a simple strategy. Herein, Fe doped NiP nanosheet arrays with rich P vacancies are developed via a facile phase transformation strategy. Based on systematic investigations, we have demonstrated that an optimized surface electronic structure, abundant active sites and improved charge transport capability can be effectively achieved by vacancy engineering. Consequently, Fe doped NiP with rich vacancies show remarkable catalytic performances with 94.5 mV for the hydrogen evolution reaction (HER) and 217.3 mV for the oxygen evolution reaction (OER) at 10 mA cm, respectively, as well as good durability. When directly employed as working electrodes, the as-obtained Fe doped NiP with rich vacancies can attain 10 mA cm at a low voltage of 1.59 V. This work demonstrates a feasible strategy for rationally fabricating electrocatalysts with rich vacancies via a simple phase transformation.
适当的空位工程被认为是提高本征活性的一种有前景的策略，但通过简单策略构建丰富的空位具有挑战性。在此，通过一种简便的相变策略制备了具有丰富磷空位的铁掺杂NiP纳米片阵列。基于系统研究，我们证明了通过空位工程可以有效地实现优化的表面电子结构、丰富的活性位点和改善的电荷传输能力。因此，具有丰富空位的铁掺杂NiP在析氢反应（HER）中表现出显著的催化性能，在10 mA cm时过电位为94.5 mV，在析氧反应（OER）中为217.3 mV，同时具有良好的耐久性。当直接用作工作电极时，所制备的具有丰富空位的铁掺杂NiP在1.59 V的低电压下可达到10 mA cm。这项工作展示了一种通过简单的相变合理制备具有丰富空位的电催化剂的可行策略。
