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<p>Cu-based nanoparticles, which are valued for their affordability and abundance, have drawn a lot of interest in catalysis because of their versatility in modifying their characteristics through chemical and synthetic means, as well as by adding new supports or multimetallic systems. A two-step reduction technique was used to prepare Cu@Au bimetallic core-shell nanoparticles which were supported by carbon black (Vulcan XC-72R), multiwall carbon nanotube (MWCNT) and activated charcoal (AC). A range of techniques, such as X-ray diffraction (XRD), electron microscopy (FESEM &amp; TEM), cyclic voltammetry (CV), energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS) were used to thoroughly analyse these nanoparticles. This study set out to evaluate their potential as anode electrocatalysts for the borohydride oxidation. The same method was also used to create MWCNT-supported gold nanoparticles in order to compare their electrocatalytic performance in the oxidation of borohydride. Notably, the MWCNT supported Au and Cu@Au nanoparticles showed higher performance in borohydride oxidation compared to Cu@Au/AC and Cu@Au/XC-72R electrocatalysts. The Cu@Au/MWCNT catalyst outperformed all other catalysts studied, showing superior stability, higher oxidation current density, and lower charge transfer resistance. Among our investigated electrocatalysts, the Cu@Au/MWCNT catalyst showed the most beneficial activation energy of 6.3&#xa0;kJ mol<sup>− 1</sup> for borohydride electro-oxidation. In cell performance tests, the Cu@Au/MWCNT electrocatalyst reached a peak open-circuit voltage of 1.86&#xa0;V and a maximum power density of 85.48 mW cm⁻².</p> Graphical Abstract <p></p>

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Borohydride oxidation performance of Cu@Au core–shell electrocatalysts supported by MWCNTs, activated charcoal, and carbon black Vulcan XC-72R: A comparative study for fuel cell applications

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Santanu Dey,
  • Chandan Kumar Raul,
  • Riju Karmakar,
  • Subhamay Pramanik,
  • Debsundar Dey,
  • Sk Irsad Ali,
  • Atis Chandra Mandal,
  • Soumen Basu

摘要

Cu-based nanoparticles, which are valued for their affordability and abundance, have drawn a lot of interest in catalysis because of their versatility in modifying their characteristics through chemical and synthetic means, as well as by adding new supports or multimetallic systems. A two-step reduction technique was used to prepare Cu@Au bimetallic core-shell nanoparticles which were supported by carbon black (Vulcan XC-72R), multiwall carbon nanotube (MWCNT) and activated charcoal (AC). A range of techniques, such as X-ray diffraction (XRD), electron microscopy (FESEM & TEM), cyclic voltammetry (CV), energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS) were used to thoroughly analyse these nanoparticles. This study set out to evaluate their potential as anode electrocatalysts for the borohydride oxidation. The same method was also used to create MWCNT-supported gold nanoparticles in order to compare their electrocatalytic performance in the oxidation of borohydride. Notably, the MWCNT supported Au and Cu@Au nanoparticles showed higher performance in borohydride oxidation compared to Cu@Au/AC and Cu@Au/XC-72R electrocatalysts. The Cu@Au/MWCNT catalyst outperformed all other catalysts studied, showing superior stability, higher oxidation current density, and lower charge transfer resistance. Among our investigated electrocatalysts, the Cu@Au/MWCNT catalyst showed the most beneficial activation energy of 6.3 kJ mol− 1 for borohydride electro-oxidation. In cell performance tests, the Cu@Au/MWCNT electrocatalyst reached a peak open-circuit voltage of 1.86 V and a maximum power density of 85.48 mW cm⁻².

Graphical Abstract