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Vacancies-Engineered M2CO2 MXene as an Efficient Hydrogen Evolution Reaction Electrocatalyst.

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Vacancy engineering in M2CO2 MXene effectively tunes hydrogen evolution reaction (HER) activity. Introducing specific vacancies optimizes hydrogen binding, enhancing catalytic performance for improved MXene applications.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • MXenes are promising 2D materials with diverse applications, including catalysis.
  • The hydrogen evolution reaction (HER) is crucial for clean energy technologies.
  • Controlling the catalytic activity of MXenes, like M2CO2, is essential for optimizing their performance.

Purpose of the Study:

  • To investigate the impact of vacancy engineering on the HER activity of M2CO2 MXene.
  • To understand the relationship between defect structures, electronic properties, and catalytic performance.
  • To explore defect chemistry as a strategy for enhancing MXene-based catalysts.

Main Methods:

  • Theoretical calculations were employed to study vacancy formation in M2CO2 MXene.
  • Analysis of hydrogen adsorption strength (ΔGH) and electronic structures of defected MXene.
  • Correlation of electronic properties, particularly surface O electronic states, with HER activity.

Main Results:

  • Single C vacancies slightly weaken H adsorption, while M or coupled M+C vacancies significantly enhance it.
  • Double C vacancies effectively weaken strong H adsorption, promoting HER activity in specific MXene compositions.
  • A linear trend was observed between the highest occupied peak position of surface O electronic states and ΔGH, enabling activity prediction.

Conclusions:

  • Vacancy engineering is a viable strategy to modulate the HER activity of M2CO2 MXene.
  • Defect chemistry offers a powerful approach to tune MXene catalytic properties.
  • This study provides insights for designing advanced MXene catalysts for energy applications.