Structural optimization of oxygen vacancies in WO3 by Cu doping for enhanced electrocatalytic nitrate reduction to ammonia

IF 6.1 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2025-06-10 DOI:10.1039/d5qi00388a

Shuangyan Li, Zhimu Zheng, F. Gao, m wu, Kuo Wei, Hao Hu, Y. L. Song, h li

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Abstract

Electrochemical nitrate reduction to ammonia can not only remove harmful nitrate pollutants from wastewater but also generate valuable ammonia. In this paper, a simple hydrothermal method was used to successfully synthesize the nanorod-shaped Cu-WO3 catalyst, demonstrating excellent NO3RR performance. Experimental results indicate that Cu-doped WO3 significantly increases the content of oxygen vacancies compared to the sample of WO3, resulting in improved NO3RR performance. As a result, Cu-WO3 exhibits high yield of NH3 is 2131.3 μg/h/mgcat and Faraday efficiency is 94% at optimum potential of −0.6 V (vs. RHE) in an alkaline electrolyte. 15N isotopic labeling tests confirm the origin of produced ammonia. Cu-WO3 also exhibits excellent electrochemical cycle stability and long-term durability, suggesting it possible application in industrial filed. In situ Fourier-transform infrared (FTIR) spectroscopy reveals that Cu-WO3 can effectively adsorb nitrate and nitrogen dioxide intermediates. This work provided valuable insights for the exploration of efficient nitrate NO3RR electrocatalysts.

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Cu掺杂增强电催化硝酸还原制氨WO3中氧空位的结构优化

电化学硝酸还原制氨不仅能去除废水中的有害硝酸盐污染物，还能生成有价氨。本文采用简单的水热法成功合成了纳米棒状Cu-WO3催化剂，具有优异的NO3RR性能。实验结果表明，与WO3样品相比，掺cu的WO3明显增加了氧空位的含量，从而提高了NO3RR的性能。结果表明，Cu-WO3在碱性电解液中，在- 0.6 V （vs. RHE）的最优电位下，NH3产率为2131.3 μg/h/mgcat，法拉第效率为94%。15N同位素标记试验确认了产生氨的来源。Cu-WO3还表现出良好的电化学循环稳定性和长期耐久性，具有工业应用前景。原位傅里叶红外（FTIR）光谱分析表明，Cu-WO3能有效吸附硝酸盐和二氧化氮中间体。这项工作为探索高效硝酸NO3RR电催化剂提供了有价值的见解。

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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