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The electrochemical reduction of NO3⁻ (NO3RR) represents a promising green technology for ammonia (NH3) synthesis. Among various electrocatalysts, Co-based materials have demonstrated considerable potential for NO3RR. However, the NH3 yield efficiency of Co-based materials is still limited due to challenges in competitive hydrogen evolution reaction (HER) and hydrogenating oxynitride intermediates (*NOx). In this study, elements of tungsten (W) and cobalt (Co) are coincorporated to form cobalt tungstate (CoWO4) nanoparticles with dual active sites, which are applied to optimize the hydrogenation of NOx and decrease HER, thereby achieving highly efficient NO3RR to NH3. Theoretical calculations indicate that Co sites in CoWO4 facilitate the adsorption and hydrogenation of *NOx intermediates, while W sites suppress the competitive HER. These dual active sites work synergistically to enhance NH3 production from NO3RR. Inspired by these calculations, CoWO4 nanoparticles are synthesized using a simple ion precipitation method, with sizes ranging from 10 to 30 nm. Electrochemical performance demonstrates that CoWO4 nanoparticles exhibit a high Faradaic efficiency of 97.8 ± 1.5% and an NH3 yield of 13.2 mg h−1 cm−2. In situ Fourier transform infrared spectroscopy characterizes the enhanced adsorption and hydrogenation behaviors of *NOx as well as minimized HER on CoWO4, which contributes to the high efficiency and selectivity to NH3. This work introduces a CoWO4 nanoparticle electrocatalytic material with dual active sites, which contribute to the design of electrocatalysts for synthesizing NH3.

権利情報:

• In Copyright
  

キーワード: Nanoparticle, Ammonia synthesis, Electrocatalyst

刊行年月日: 2025-04-14

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Nanoscale Horizons (ISSN: 20556756) vol. 10 issue. 6 p. 1096-1106

研究助成金:

• National Natural Science Foundation of China 22072183
• Natural Science Foundation of Hunan Province 2022JJ30690

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5516

公開URL: https://doi.org/10.1039/d5nh00120j

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更新時刻: 2026-02-14 21:52:27 +0900

MDRでの公開時刻: 2026-04-15 08:25:03 +0900