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Title: Confined growth of pyridinic N–Mo₂C sites on MXenes for hydrogen evolution
Authors: Wang, Hao
Lin, Yanping
Liu, Shuyuan
Li, Jianmin
Bu, Liangmin
Chen, Jianmei
Xiao, Xu
Choi, Jin-Ho
Gao, Lijun
Lee, Jong-Min
Keywords: Engineering::Chemical engineering
Issue Date: 2020
Source: Wang, H., Lin, Y., Liu, S., Li, J., Bu, L., Chen, J., Xiao, X., Choi, J., Gao, L. & Lee, J. (2020). Confined growth of pyridinic N–Mo₂C sites on MXenes for hydrogen evolution. Journal of Materials Chemistry A, 8(15), 7109-7116.
Project: RG105/19
Journal: Journal of Materials Chemistry A
Abstract: Developing low-cost and high-performance hydrogen evolution reaction (HER) electrocatalysts is a key research area for scalable hydrogen production from water electrolysis. Here, a hybrid of nitrogen-doped carbon encapsulated Mo₂C nanodots on Ti₃C₂Tx MXene (Mo₂C/Ti₃C₂Tx@NC) is developed through in situ polymerization of dopamine and a Mo precursor on the Ti₃C₂Tx MXene surface. During the annealing treatment, the polydopamine plays multiple roles in forming N-doped carbon, confining MoO₄²⁻ ions into ultrasmall Mo₂C nanodots, and stabilizing the MXene flakes against spontaneous oxidation. The as-synthesized hybrid exhibits excellent HER activity in acidic electrolyte with an overpotential of 53 mV at 10 mA cm(⁻²) and excellent stability over 30 hours. The combination of experiments and simulations demonstrates that pyridinic N-doped carbon coated Mo₂C nanodots serve as the active sites and Ti₃C₂Tx MXene facilitates the charge transfer, synergistically contributing to the superior HER performance.
ISSN: 2050-7488
DOI: 10.1039/D0TA01697G
Rights: © The Royal Society of Chemistry 2020. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles

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