Tong Yun, Chen Pengzuo, Chen Lu, Cui Xinjiang
Department of Chemistry, School of Sciences, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, P. R. China.
Institute of Chemical Sciences and Engineering, École Polytechnique Fedérale de Lausanne, 1015, Lausanne, Switzerland.
ChemSusChem. 2021 Jun 21;14(12):2576-2584. doi: 10.1002/cssc.202100720. Epub 2021 May 17.
Exploring highly efficient electrocatalysts for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is of great significance for addressing energy and environmental crises. Vacancy engineering has been regarded as a promising way to optimize the catalytic activity of electrocatalysts. Herein, we put forward a conceptually new dual Ni,S vacancy engineering on 2D NiPS nanosheet (denoted as V-NiPS ) by a simple ball-milling treatment with ultrasonication. This material presents an ideal model for exploring the role of dual vacancies in improving the catalytic activity for overall water splitting. Structural analyses make clear that the formation of dual Ni,S vacancies regulates the electronic structure and catalytic active sites of NiPS nanosheet, leading to the superior HER/OER performance. Smaller overpotentials of 124 mV and 290 mV can be achieved at a current density of 10 mA cm for HER and OER, respectively. The OER performance of V-NiPS is the best value among all state-of-the-art NiPS catalysts. In addition, the assembled two-electrode cell incorporating V-NiPS exhibits enhanced catalytic performance with a low cell voltage of 1.60 V at 10 mA cm . This work offers a promising avenue to improve the electrocatalytic performance of the catalysts by engineering dual vacancies for large-scale water splitting.
探索用于析氢反应（HER）和析氧反应（OER）的高效电催化剂对于解决能源和环境危机具有重要意义。空位工程被认为是优化电催化剂催化活性的一种有前途的方法。在此，我们通过简单的超声球磨处理，在二维NiPS纳米片（表示为V-NiPS）上提出了一种概念上新的双Ni、S空位工程。这种材料为探索双空位在提高全水分解催化活性中的作用提供了理想模型。结构分析表明，双Ni、S空位的形成调节了NiPS纳米片的电子结构和催化活性位点，从而导致优异的HER/OER性能。在10 mA cm的电流密度下，HER和OER分别可实现124 mV和290 mV的较小过电位。V-NiPS的OER性能是所有现有NiPS催化剂中的最佳值。此外，组装的包含V-NiPS的双电极电池在10 mA cm下具有增强的催化性能，电池电压低至1.60 V。这项工作为通过设计双空位来提高催化剂的电催化性能以实现大规模水分解提供了一条有前途的途径。
