Confined growth of pyridinic N–Mo₂C sites on MXenes for hydrogen evolution
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 s...
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Main Authors: | , , , , , , , , , |
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Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2022
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Subjects: | |
Online Access: | https://hdl.handle.net/10356/154914 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | 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. |
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