Scholarlink

<p>Pristine Mo<sub>2</sub>C suffers from the inherent deficiencies of excessive absorption strength of intermediate H and unsatisfied electron transfer efficiency, which suppresses its electrocatalytic performance for the hydrogen evolution reaction. In this work, a thermodynamics-guided thermal approach was developed to construct the self-supported Mo<sub>2</sub>C-Mo<sub>2</sub>N heterostructure encapsulated in N-doped carbon <i>in situ</i>, aiming to improve its performance by integrating the electron coupling effect at the Mo<sub>2</sub>C/Mo<sub>2</sub>N interface and the enhanced conductivity originating from carbon decoration. For this purpose, a Mo, C, N-containing organic–inorganic hybrid precursor was first grown on a carbon substrate, and its pyrolysis behavior was elucidated via thermodynamic phase equilibrium calculations. Experimental investigations verified the controllability of the phase composition of the obtained catalyst by adjusting the annealing atmosphere, thereby guaranteeing highly exposed heterojunctions with uniform distribution, a feature rarely achievable with conventional multi-step synthesis strategies, while enabling high efficiency for enhanced catalytic performance. An overpotential of only 217&#xa0;mV is required to achieve a current density of 100&#xa0;mA&#xa0;cm<sup>−2</sup> in alkaline conditions, representing a decrease of 30&#xa0;mV compared to the benchmark Pt/C, together with 86.9% preservation of initial capacity after a 100&#xa0;h test. Further investigation reveals that surface structural reconstruction of the catalyst contributes to its exceptional durability at high current densities.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermodynamics guided in situ integrating Mo2C-Mo2N into heterogeneous nanobelt arrays encapsulated with nitrogen-doped carbon for efficient electrocatalytic hydrogen evolution

  • 期刊论文

  • 发表日期：

    2026年6月2日

查看全文
  • Yong-Zhi Zheng,
  • He-Xiong Liu,
  • Jia-Wen Ren,
  • Qin-Qin Zhou,
  • Peng Hu,
  • Jin-Shu Wang

摘要

Pristine Mo2C suffers from the inherent deficiencies of excessive absorption strength of intermediate H and unsatisfied electron transfer efficiency, which suppresses its electrocatalytic performance for the hydrogen evolution reaction. In this work, a thermodynamics-guided thermal approach was developed to construct the self-supported Mo2C-Mo2N heterostructure encapsulated in N-doped carbon in situ, aiming to improve its performance by integrating the electron coupling effect at the Mo2C/Mo2N interface and the enhanced conductivity originating from carbon decoration. For this purpose, a Mo, C, N-containing organic–inorganic hybrid precursor was first grown on a carbon substrate, and its pyrolysis behavior was elucidated via thermodynamic phase equilibrium calculations. Experimental investigations verified the controllability of the phase composition of the obtained catalyst by adjusting the annealing atmosphere, thereby guaranteeing highly exposed heterojunctions with uniform distribution, a feature rarely achievable with conventional multi-step synthesis strategies, while enabling high efficiency for enhanced catalytic performance. An overpotential of only 217 mV is required to achieve a current density of 100 mA cm−2 in alkaline conditions, representing a decrease of 30 mV compared to the benchmark Pt/C, together with 86.9% preservation of initial capacity after a 100 h test. Further investigation reveals that surface structural reconstruction of the catalyst contributes to its exceptional durability at high current densities.

Graphical abstract