Dual CoxSy-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

• DOI: 10.1021/acsami.2c21998
• Publication Date: 2023-02-22T18:29:38Z
• Authors: Liangbin Xia; Fang Wang; Kunming Pan; Biying Zhang; Wenzhen Li; Xiao Ma; Tianxiang Yang; Yanjie Xu; Yongpeng Ren; Hua Yu; Shizhong Wei
• Keywords: Tungsten disulfide; Molybdenum disulfide

The rational design and preparation of a heterogeneous electrocatalyst for hydrogen evolution reaction (HER) has become research hotspot, while applicable pH-universal tungsten disulfide (WS2)-based hybrid composites are rarely reported. Herein, we propose novel catalyst (WS2/Co9S8/Co4S3) comprising two heterojunctions WS2/Co4S3 WS2/Co9S8, which grow on the porous skeleton Co, N-codoped carbon (Co/NC) flexibly to all-pH electrolytes. effect double coupling HER activity is explored as highly flexible heterojunction conducive tune catalyst, synergistic interaction maximized by adjusting proportion components. Theoretical calculations show that both WS2/Co9S8 have Gibbs free energy H (|ΔGH*|) close 0.0 eV facile decomposition water barrier. As collective synergy dual CoxSy-modified WS2 heterojunction, WS2/Co9S8/Co4S3 greatly enhances compared bare Co9S8/Co4S3 or single (WS2/Co9S8) in media. Besides, elucidated unique mechanism decompose H2O confirm its excellent under alkaline neutral conditions. Thus, this work provides new insights into WS2-based materials potentially applied sustainable energy.