Highly selective and efficient electrochemical nitrate removal via Ni-doped Cu(OH)2 nanowires promoting H* reaction

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-01-09 DOI:10.1016/j.electacta.2025.145681

Yanqiang Zou, Guo-hua Liu, Qiangang Li, Suying Ding, Binhua Liu, Lu Qi, Hongchen Wang

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Abstract

Electrochemical reduction of nitrate (NO₃⁻) offers a promising approach for nitrate removing from water. Development of non-noble metal electrocatalysts with high reactivity and selectivity is crucial for the electrochemical reduction of NO₃⁻. Herein, Ni-doped Cu(OH)₂ nanowires (Ni-Cu(OH)₂ NW/CF) were synthesised on copper foam (CF) and utilised as a cathode, enabling efficient and selective nitrate removal with further conversion to harmless N₂. The Ni-Cu(OH)₂ NW/CF electrode achieved a 99.8 % NO₃⁻-N conversion rate within 40 min, with a reaction rate 25 times higher than CF and 1.51 times than that of Cu(OH)₂. It demonstrated a rapid nitrate reduction apparent rate constant (0.02072 cm⁻² min⁻¹) without nitrite accumulation. With the assistance of active chlorine at the anode, the electrocatalytic system effectively converted NO₃⁻ into harmless N₂, achieving a final N₂ selectivity of 99.9 %. The Cu(OH)₂ nanowires provided abundant active sites to enhance NO₃⁻ adsorption and conversion, while Ni doping mainly accelerated the reduction of NO₂⁻ intermediate by facilitating the atomic hydrogen (H*)-mediated reaction pathway on the electrode surface. This relay catalytic effect enhanced the electrode's adsorption and reduction capabilities for NO₃⁻. Notably, the Ni-Cu(OH)₂ NW/CF electrode maintained consistent performance over 10 experimental cycles. This study provides novel strategy for designing non-noble metal electrocatalysts with high selectivity and efficiency for NO₃⁻ removal.

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ni掺杂Cu(OH)2纳米线促进H*反应的高选择性和高效电化学去除硝酸盐

电化学还原硝酸盐（NO3−）是去除水中硝酸盐的一种很有前途的方法。开发具有高反应活性和选择性的非贵金属电催化剂是电化学还原NO3−的关键。本文在泡沫铜（CF）上合成了ni掺杂Cu(OH)2纳米线（Ni-Cu(OH)2 NW/CF），并将其用作阴极，能够高效、选择性地去除硝酸盐，并进一步转化为无害的N2。Ni-Cu(OH)2 NW/CF电极在40 min内NO3−-N转化率达到99.8%，反应速率是CF的25倍，是Cu(OH)2的1.51倍。硝酸还原速率常数为0.02072 cm−2 min−1，无亚硝酸盐积累。在阳极活性氯的辅助下，电催化系统有效地将NO3−转化为无害的N2，最终N2选择性达到99.9%。Cu(OH)2纳米线提供了丰富的活性位点，增强了NO3−的吸附和转化，而Ni掺杂主要通过促进原子氢（H*）介导的电极表面反应途径来加速NO2−中间体的还原。这种接力催化效应增强了电极对NO3−的吸附和还原能力。值得注意的是，Ni-Cu(OH)2 NW/CF电极在10个实验周期内保持了一致的性能。该研究为设计高选择性、高效率的非贵金属NO3−去除电催化剂提供了新思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.