Dissolution reconstruction of electron-transfer enhanced hierarchical NiSx-MoO2 nanosponges as a promising industrialized hydrogen evolution catalyst beyond Pt/C

• Published in: Journal of colloid and interface science 2020-05, Vol.567, p.339-346
• Main Authors: Wang, Benzhi, Huang, Hexiu, Sun, Tingting, Yan, Puxuan, Isimjan, Tayirjan Taylor, Tian, Jianniao, Yang, Xiulin
• Format: Article
• Language: English
• Subjects: Electrolysis; Electron transfer; Hydrogen evolution; NiSx-MoO2 nanosponges; Synergistic effect
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2020.02.027

[Display omitted] •The NiSx-MoO2/CC is fabricated by two-step electrodeposition plus calcination.•The NiSx-MoO2/CC outperforms Pt/C at overpotential over 114 mV for HER.•The NiSx-MoO2/CC surpasses widely used industrial Raney Ni catalyst at 500 mA cm−2.•The catalyst shows excellent long-term stability with almost no decay.•The superior performance attributes to the porous structure and electronic effect. An industrial electro-catalyst obliges three essential features, such as scalability, generating high current density at low overpotential, and long-term stability. Herein, we tackle those challenges using NiSx-MoO2 nanosponges on carbon cloth based hydrogen evolution catalyst. The target catalyst was synthesized through a series of simple and scalable methods, including dissolution, reconstruction, and chemical vapor deposition. The optimized NiSx-MoO2/CC catalyst exhibits a superior hydrogen evolution catalytic activity far better than commercial Pt/C meanwhile surpasses widely used industrial Raney Ni catalyst by many aspects, namely lower overpotential at 500 mA cm−2 current density and smaller Tafel plot in 30 wt% KOH solution. This excellent electrocatalytic activity is attributed to enhanced mass transfer and faster reaction kinetics due to the unique hierarchical porous structures, as well as the synergistic electron transfer effect between the two components of NiSx and MoO2 species. This work may provide a new strategy for the design of better hydrogen evolution catalyst for industrial application.