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A nanoflower-on-nanowire heterogeneous electrocatalyst for enhanced interfacial water activation in nitrate reduction reaction

文献类型： 外文期刊

作者： Yu, Jingwen 1 ; Liu, Yunliang 1 ; Fan, Cunhao 1 ; Liu, Naiyun 1 ; Yin, Jingya 2 ; Li, Yaxi 1 ; Cheng, Yuanyuan 1 ; Yuan, Xinya 1 ; Zhang, Xinyue 1 ; Liu, Yixian 1 ; Fan, Sanjun 3 ; Xu, Lei 4 ; Li, Haitao 1 ;

作者机构： 1.Jiangsu Univ, Inst Energy Res, Sch Chem & Chem Engn, Zhenjiang 212013, Peoples R China

2.Qingdao Municipal Ctr Dis Control & Prevent, Qingdao 266033, Peoples R China

3.Ohio State Univ, Dept Chem & Biochem, Columbus, OH 43210 USA

4.Jiangsu Acad Agr Sci, Inst Agr Facil & Equipment, Jiangsu Engn Technol Res Ctr Biomass Composites &, Nanjing 210014, Peoples R China

5.Minist Agr & Rural Affairs, Key Lab Protected Agr Engn Middle & Lower Reaches, Nanjing 210014, Peoples R China

关键词： active hydrogen; electron transfer; nitrate; ammonia

期刊名称：NANO RESEARCH （ 影响因子：9.0； 五年影响因子：8.7 ）

ISSN： 1998-0124

年卷期： 2025 年 18 卷 2 期

页码：

收录情况： SCI

摘要： Electrocatalytic nitrate reduction reaction (NitRR) is an efficient route for simultaneous wastewater treatment and ammonia production, but the conversion of NO3- to NH3 involves multiple electron and proton transfer processes and diverse by-products. Therefore, developing ammonia catalysts with superior catalytic activity and selectivity is an urgent task. The distinctive electronic structure of Cu enhances the adsorption of nitrogen-containing intermediates, but the insufficient activation capability of Cu for interfacial water restricts the generation of reactive hydrogen and inhibits the hydrogenation process. In this work, a Ce-doped CuO catalyst (Ce10/CuO) was synthesized by in situ oxidative etching and annealing. The redox of Ce3+/Ce4+enables the optimization of the electronic structure of the catalyst, and the presence of Ce3+ as a defect indicator introduces more oxygen vacancies. The results demonstrate that Ce10/CuO provides an impressive ammonia yield of 3.88 +/- 0.14 mmolcm-2h-1 at 0.4 V vs. reversible hydrogen electrode (RHE) with an increase of 1.04 mmolcm-2h-1 compared to that of pure CuO, and the Faradaic efficiencies (FE) reaches 93.2% +/- 3.4%. In situ characterization confirms the doping of Ce facilitates the activation and dissociation of interfacial water, which promotes the production of active hydrogen and thus enhances the ammonia production efficiency.

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