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<p>High-entropy alloys (HEAs) have attracted significant interest because of the materials structural and thermal stabilities, tailorable compositions, and unique functional properties. The present study synthesizes for the first time a noble metals-free HEA of Cu, Fe, Zn, Ni, and Co (CFZNC) supported on activated carbon powder (ACP) by the suspension polymerization of a phenol–formaldehyde precursor, followed by thermal treatment (carbonization, steam-activation, and H<sub>2</sub>-reduction), and ball milling. Metal salts were in situ added to the polymerization reaction mixture. The electrochemical activity tests reveal a good hydrogen evolution rate (169&#xa0;μmol.L<sup>−1</sup>.h<sup>−1</sup>) over the synthesized CFZNC-HEA/ACP, with an overpotential of 139&#xa0;mV at the current density of 10&#xa0;mA.cm<sup>−2</sup> in alkaline medium. The tests also show the Faradaic efficiency of 90.5% and the materials stability up to 30&#xa0;h. This study has provided a new approach to synthesize the non-noble metals-based HEA in bulk quantity as an efficient electroctalyst for environmental and energy applications including hydrogen storage, and carbon dioxide and nitrate reductions.</p> Graphical Abstract <p></p>

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Carbon-Supported Noble Metal-Free High-Entropy Alloy: A New Synthesis Approach and Application to Hydrogen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Naveen Kumar Verma,
  • Rahul Gupta,
  • Nishith Verma

摘要

High-entropy alloys (HEAs) have attracted significant interest because of the materials structural and thermal stabilities, tailorable compositions, and unique functional properties. The present study synthesizes for the first time a noble metals-free HEA of Cu, Fe, Zn, Ni, and Co (CFZNC) supported on activated carbon powder (ACP) by the suspension polymerization of a phenol–formaldehyde precursor, followed by thermal treatment (carbonization, steam-activation, and H2-reduction), and ball milling. Metal salts were in situ added to the polymerization reaction mixture. The electrochemical activity tests reveal a good hydrogen evolution rate (169 μmol.L−1.h−1) over the synthesized CFZNC-HEA/ACP, with an overpotential of 139 mV at the current density of 10 mA.cm−2 in alkaline medium. The tests also show the Faradaic efficiency of 90.5% and the materials stability up to 30 h. This study has provided a new approach to synthesize the non-noble metals-based HEA in bulk quantity as an efficient electroctalyst for environmental and energy applications including hydrogen storage, and carbon dioxide and nitrate reductions.

Graphical Abstract