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O-coordinated W-Mo dual-atom catalyst for pH-universal electrocatalytic hydrogen evolution.

Yang Yang1,2, Yumin Qian3, Haijing Li4

  • 1Institute of Crystalline Materials, Shanxi University, Taiyuan, Shanxi 030006, China.

Science Advances
|June 18, 2020
PubMed
Summary

A novel dual-atom catalyst (DAC) featuring tungsten-molybdenum (W-Mo) demonstrates platinum-like activity for the hydrogen evolution reaction (HER). This catalyst exhibits exceptional stability across all pH levels, offering a promising advancement in catalysis.

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Single-atom catalysts (SACs) offer high metal atom efficiency for the hydrogen evolution reaction (HER).
  • Bimetal atom catalysts show synergistic effects for enhanced HER activity beyond SACs, but their design is challenging.
  • Developing advanced catalysts is crucial for efficient hydrogen production.

Purpose of the Study:

  • To design and synthesize a novel dual-atom catalyst (DAC) for improved hydrogen evolution reaction (HER) activity and stability.
  • To investigate the structure-activity relationship of the W-Mo dual-atom catalyst.
  • To evaluate the catalytic performance in a pH-universal electrolyte.

Main Methods:

  • Controllable self-assembly and nitridation processes were used to synthesize the O-coordinated W-Mo heterodimer embedded in N-doped graphene (W1Mo1-NG).
  • The catalyst structure was characterized, revealing a W-O-Mo-O-C configuration anchored in graphene vacancies.
  • Electrochemical measurements were performed to assess the HER performance in a pH-universal electrolyte.

Main Results:

  • The synthesized W1Mo1-NG DAC exhibited Pt-like activity for the hydrogen evolution reaction.
  • The catalyst demonstrated ultrahigh stability in a pH-universal electrolyte.
  • The W-O-Mo-O-C configuration facilitated electron delocalization, optimizing hydrogen adsorption and boosting HER kinetics.

Conclusions:

  • The W1Mo1-NG DAC presents a promising strategy for developing highly active and stable electrocatalysts for HER.
  • The synergistic interaction between W and Mo atoms, mediated by oxygen coordination, significantly enhances intrinsic catalytic activity.
  • This work provides insights into the rational design of dual-atom catalysts for energy conversion applications.