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<p>Electrochemical nitrate reduction reaction (NRR) was investigated using Cu-modified Pt electrode prepared via controlled electrodeposition cycles. The aim was to systematically vary Cu content on Pt electrode (3 to 15 cycles) to evaluate its influence on catalytic activity, surface properties, and charge transfer kinetics during NRR in neutral medium. Voltametric analysis revealed a progressive increase in NRR performance, surface coverage, roughness factor, and double-layer capacitance reaching a saturation at 10 deposition cycles, beyond which no improvement was observed. However, kinetic analysis through Tafel plot and impedance parameters showed an opposite trend, where the exchange current decreased and charge transfer resistance increased with higher Cu content on Pt electrode. This indicates that although Cu content enhanced the electroactive surface area, it simultaneously suppressed the intrinsic electron transfer kinetics. Scan rate studies confirmed multi-step diffusion-controlled reaction pathway involving nitrate to nitrite, hydroxylamine, and ammonia. The study highlights the critical balance between surface area enhancement and modulation of intrinsic catalytic kinetics to achieve optimal performance of Pt-Cu electrode for NRR.</p>

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Optimizing Cu-modified Pt electrodes for electrochemical nitrate reduction: decoupling the surface effects and electrokinetic behavior

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Mohammad Imran Hossain,
  • Nure Alam Siddique,
  • Faiza Jan Iftikhar,
  • Syed Kashif Ali,
  • Sami Ben Aoun,
  • Mohammad Anwar Parvez,
  • Mostafizur Rahaman,
  • Mohammad A. Hasnat

摘要

Electrochemical nitrate reduction reaction (NRR) was investigated using Cu-modified Pt electrode prepared via controlled electrodeposition cycles. The aim was to systematically vary Cu content on Pt electrode (3 to 15 cycles) to evaluate its influence on catalytic activity, surface properties, and charge transfer kinetics during NRR in neutral medium. Voltametric analysis revealed a progressive increase in NRR performance, surface coverage, roughness factor, and double-layer capacitance reaching a saturation at 10 deposition cycles, beyond which no improvement was observed. However, kinetic analysis through Tafel plot and impedance parameters showed an opposite trend, where the exchange current decreased and charge transfer resistance increased with higher Cu content on Pt electrode. This indicates that although Cu content enhanced the electroactive surface area, it simultaneously suppressed the intrinsic electron transfer kinetics. Scan rate studies confirmed multi-step diffusion-controlled reaction pathway involving nitrate to nitrite, hydroxylamine, and ammonia. The study highlights the critical balance between surface area enhancement and modulation of intrinsic catalytic kinetics to achieve optimal performance of Pt-Cu electrode for NRR.