Nitrogen-Doped Graphene Encapsulating Fe2N for Enhanced Electrocatalytic Conversion of Nitrate to Ammonia

IF 4.3 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Chemical Communications Pub Date : 2025-04-24 DOI:10.1039/d5cc01270h

Yating Chen, Taiquan Rao, Jiayu Zhan, Lu-Hua Zhang, Fengshou Yu

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Abstract

This study reports the synthesis of a nitrogen-doped graphene encapsulating iron nitride (Fe₂N@NC) electrocatalyst with outstanding activity for NO₃RR, achieving excellent Faradaic efficiency (FE) for NH₃ of 96.11% and high NH₃ yield rate of 618.35 mmol h⁻¹ g_cat-1 at -0.5 V versus the reversible hydrogen electrode (RHE). Furthermore, the catalyst maintains a FE exceeding 90% across a broad range of potentials (from -0.3 to -0.7 V vs. RHE) and 85% across a wide range of concentrations (from 0.001 M to 0.5 M). Electron transfer between Fe and the support results in the formation of electron-deficient Fe. The experimental results demonstrated that electron-deficient Fe enhances the adsorption of NO₃^-. Furthermore, doping with Fe effectively utilizes *H radicals and inhibits the hydrogen evolution reaction (HER), thereby enhancing the activity of NO₃RR.

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氮掺杂石墨烯包裹 Fe2N，用于增强硝酸盐到氨的电催化转化

本研究报道了一种氮掺杂石墨烯包封氮化铁（Fe2N@NC）电催化剂的合成，该催化剂对NO3RR具有优异的活性，与可逆氢电极（RHE）相比，在-0.5 V下，NH3的法拉第效率（FE）达到96.11%，NH3的产率达到618.35 mmol h−1 gcat-1。此外，该催化剂在较宽的电位范围内（从-0.3到-0.7 V vs. RHE）保持超过90%的FE，在较宽的浓度范围内（从0.001 M到0.5 M）保持超过85%的FE。FE和载体之间的电子转移导致了缺电子FE的形成。实验结果表明，缺电子铁增强了对NO3-的吸附。此外，Fe的掺杂有效地利用了*H自由基，抑制了析氢反应（HER），从而增强了NO3RR的活性。

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

Chemical Communications 化学-化学综合

CiteScore

8.60

自引率

4.10%

发文量

2705

审稿时长

1.4 months

期刊介绍： ChemComm (Chemical Communications) is renowned as the fastest publisher of articles providing information on new avenues of research, drawn from all the world''s major areas of chemical research.