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<p>Electrocatalytic technology plays a pivotal role in developing carbon–neutral solutions, where the pursuit of cost-effective and durable catalysts remains a critical challenge. While beryllium copper alloys (BeCu) exhibit exceptional mechanical strength (≥ 380 HV), corrosion resistance in extreme pH conditions, and high electrical conductivity (22% IACS), their potential as catalytic substrates has been underexplored. Herein, we demonstrate a RuO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub> heterostructure precisely engineered on BeCu needle substrates through low-temperature hydrothermal synthesis (100&#xa0;°C, 12&#xa0;h) coupled with controlled annealing processes. Morphological analysis revealed the formation of hedgehog-like nanoarchitectures on the RuO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub>/BeCu electrode, creating a hierarchical surface that maximizes active site exposure. Electrochemical evaluation in 1.0&#xa0;M KOH + 0.5&#xa0;M NaCl demonstrated exceptional HER performance, with the composite electrode achieving an ultralow overpotential of 36&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>-2</sup>—surpassing commercial Pt/C (70&#xa0;mV) while maintaining 70% initial activity after 30&#xa0;h of continuous operation. This work provides a template for designing robust non-precious electrocatalysts through rational substrate–catalyst synergy, without compromising the structural fidelity of original experimental observations.</p> Graphical Abstract <p></p>

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Co3O4/RuO2 mimetic nanostructures formed on beryllium copper substrates: as efficient catalysts for hydrogen evolution reactions

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Chenglin Liu,
  • Jia Liu,
  • Shanshan Gao,
  • Fushan Chen,
  • Xianglin Qiu,
  • Xukang Lang,
  • Yuzheng Wang,
  • Jiahao Ma,
  • Xiaoming Song

摘要

Electrocatalytic technology plays a pivotal role in developing carbon–neutral solutions, where the pursuit of cost-effective and durable catalysts remains a critical challenge. While beryllium copper alloys (BeCu) exhibit exceptional mechanical strength (≥ 380 HV), corrosion resistance in extreme pH conditions, and high electrical conductivity (22% IACS), their potential as catalytic substrates has been underexplored. Herein, we demonstrate a RuO2/Co3O4 heterostructure precisely engineered on BeCu needle substrates through low-temperature hydrothermal synthesis (100 °C, 12 h) coupled with controlled annealing processes. Morphological analysis revealed the formation of hedgehog-like nanoarchitectures on the RuO2/Co3O4/BeCu electrode, creating a hierarchical surface that maximizes active site exposure. Electrochemical evaluation in 1.0 M KOH + 0.5 M NaCl demonstrated exceptional HER performance, with the composite electrode achieving an ultralow overpotential of 36 mV at 10 mA cm-2—surpassing commercial Pt/C (70 mV) while maintaining 70% initial activity after 30 h of continuous operation. This work provides a template for designing robust non-precious electrocatalysts through rational substrate–catalyst synergy, without compromising the structural fidelity of original experimental observations.

Graphical Abstract