期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138157
关键词
MXene; Heterogeneous interface; Hydrogen evolution reaction; DFT calculation; Hydrazine oxidation reaction
资金
- National Science Fund for Distinguished Young Scholars [52025041]
- National Natural Science Foundation of China [51974021, 52172110, 51902020]
- Scientic and Technical Innovation Action Plan Hong Kong, Macao and Taiwan Science & Technology Cooperation Project of Shanghai Science and Technology Committee [21520760500]
- Natural Science Foundation of Shanghai [19ZR1479400]
A strategy based on interfacial engineering was reported to improve the hydrogen evolution reaction (HER) kinetics of MoS2 by fabricating Co-doped 1T-MoS2 coupling with V2C MXene. The synthesized nanohybrid demonstrated excellent HER performance with small overpotentials and outstanding stability. It also showed promising potential in overall hydrazine-assisted water splitting system.
Earth-abundant MoS2 has attracted great attentions as a promising hydrogen evolution reaction (HER) electrocatalyst, but it is limited by sluggish water dissociation and strong adsorption of the oxygen-containing intermediates in alkaline media. Herein, an interfacial engineering strategy to fabricate Co-doped 1T-MoS2 coupling with V2C MXene was reported to improve the HER kinetics of MoS2. DFT calculations predict that the construction of heterogeneous interfaces between V2C MXene and Co-doped 1T-MoS2 can effectively reduce the energy barrier of water dissociation and optimize the free energy of hydrogen adsorption. As a result, the synthesized Co-MoS2/V2C@CC nanohybrid exhibits excellent HER performance with small overpotentials of 70.1, 263.2 and 296 mV to achieve current densities of 10, 500 and 1000 mA cm(-2), respectively, and outstanding stability for 50 h HER test without degradation. Additionally, the overall hydrazine-assisted water splitting (OHzS) system catalyzed by Co-MoS2/V2C@CC in both anode and cathode requires only 0.33 V to achieve a current density of 10 mA cm(-2) with significant long-term durability.
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