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Surface-Dependent Hydrogen Evolution Activity of Copper Foil.

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  • 1Hefei New-Materials Institute Co., Ltd., Hefei 238200, China.

Materials (Basel, Switzerland)
|March 11, 2023
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Summary

Surface engineering of copper foils significantly enhances catalytic activity. Annealing transforms copper (220) planes to (200) planes, lowering overpotential for hydrogen evolution by 136 mV due to active hollow sites.

Keywords:
copper foilscrystal planes controlhydrogen evolutiontemperature gradient annealing

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Catalysis

Background:

  • Single-crystal planes are crucial for understanding catalytic mechanisms.
  • Copper is a widely studied catalyst for various chemical reactions.

Purpose of the Study:

  • To investigate the effect of surface plane modification on copper's catalytic performance.
  • To identify specific active sites responsible for enhanced catalytic activity.

Main Methods:

  • Rolled copper foils with predominantly (220) planes were used.
  • Temperature gradient annealing was employed to induce grain recrystallization and transform planes to (200).
  • Electrochemical measurements were conducted in acidic solution.

Main Results:

  • Annealed copper foils with (200) planes exhibited a 136 mV lower overpotential at 10 mA cm⁻² compared to (220) foils.
  • Computational results indicated that hollow sites on the (200) plane possess the highest hydrogen adsorption energy.
  • These hollow sites were identified as the active centers for hydrogen evolution.

Conclusions:

  • Specific surface planes, particularly the (200) plane with hollow sites, significantly enhance catalytic activity for hydrogen evolution.
  • Surface engineering through controlled annealing is a critical strategy for designing efficient copper catalysts.
  • This study elucidates the structure-activity relationship at the atomic level for copper-based electrocatalysts.