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Dual Vacancies Confined in Nickel Phosphosulfide Nanosheets Enabling Robust Overall Water Splitting
Author(s) -
Tong Yun,
Chen Pengzuo,
Chen Lu,
Cui Xinjiang
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100720
Subject(s) - nanosheet , oxygen evolution , water splitting , catalysis , materials science , vacancy defect , hydrogen production , nickel , chemical engineering , nanotechnology , dual (grammatical number) , electrode , chemistry , electrochemistry , crystallography , metallurgy , art , biochemistry , literature , photocatalysis , engineering
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 3 nanosheet (denoted as V−NiPS 3 ) 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 3 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 −2 for HER and OER, respectively. The OER performance of V−NiPS 3 is the best value among all state‐of‐the‐art NiPS 3 catalysts. In addition, the assembled two‐electrode cell incorporating V−NiPS 3 exhibits enhanced catalytic performance with a low cell voltage of 1.60 V at 10 mA cm −2 . This work offers a promising avenue to improve the electrocatalytic performance of the catalysts by engineering dual vacancies for large‐scale water splitting.