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Abstract <p>To address the challenge regarding nitrate pollution from agriculture and industry, we developed a novel integrated system featuring a bimetallic membrane electrode assembly (Pt<b>|</b>Nafion<b>|</b>Pt–Cu) coupled with a suspended Pd–Cu/activated carbon (AC) catalyst for the nitrate reduction reaction (NRR) in low-conductivity media. This design leverages a synergistic mechanism, combining electrochemical reduction and catalytic hydrogenation for enhanced efficiency. The system demonstrated exceptional performance, achieving a high observed rate constant (<i>k</i><sub>obs</sub> = 43.2 × 10<sup>−3</sup> min<sup>−1</sup>) alongside superior product selectivity; notably low nitrite accumulation (15.8%) and high ammonia yield (63.3%) during batch electrolysis. This performance underscores the effectiveness of utilizing in situ electro-generated hydrogen, activated by the Pd–Cu/AC catalyst, in conjunction with Cu-surface modification for efficient and selective nitrate removal. Furthermore, the structural and chemical robustness of the electrode assembly was confirmed through comprehensive characterization via scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (PXRD) pre- and post-electrolysis. This work presents a promising, sustainable strategy for water remediation and the recovery of valuable nitrogen products.</p>

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Synergistic Electrochemical-Catalytic Hybrid System in Pt|Nafion|Pt–Cu Assembly Reactor for Efficient Nitrate Reduction

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Mohebul Ahsan,
  • Md. A. Rashed,
  • Jahir Ahmed,
  • M. Faisal,
  • Jari S. Algethami,
  • Nayan Ranjan Singha,
  • Farid A. Harraz,
  • Mohammad A. Hasnat

摘要

Abstract

To address the challenge regarding nitrate pollution from agriculture and industry, we developed a novel integrated system featuring a bimetallic membrane electrode assembly (Pt|Nafion|Pt–Cu) coupled with a suspended Pd–Cu/activated carbon (AC) catalyst for the nitrate reduction reaction (NRR) in low-conductivity media. This design leverages a synergistic mechanism, combining electrochemical reduction and catalytic hydrogenation for enhanced efficiency. The system demonstrated exceptional performance, achieving a high observed rate constant (kobs = 43.2 × 10−3 min−1) alongside superior product selectivity; notably low nitrite accumulation (15.8%) and high ammonia yield (63.3%) during batch electrolysis. This performance underscores the effectiveness of utilizing in situ electro-generated hydrogen, activated by the Pd–Cu/AC catalyst, in conjunction with Cu-surface modification for efficient and selective nitrate removal. Furthermore, the structural and chemical robustness of the electrode assembly was confirmed through comprehensive characterization via scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (PXRD) pre- and post-electrolysis. This work presents a promising, sustainable strategy for water remediation and the recovery of valuable nitrogen products.