Electrochemical nitrate reduction reaction (NO3RR) is considered a promising strategy for ammonia synthesis and nitrate removal, in which catalyst development is crucial. Herein, a series of bimetal (Co and Cu) anchoring porous MXene nanosheets (CoxCuy@PM) catalysts were prepared by combining etching and reduction strategy. On the one hand, Cu and Co bimetals provided tandem catalytic active sites for NO3RR. On the other hand, the in‐plane PM exhibited good electrical conductivity and multiple transport pathways. Consequently, the optimized Co7Cu3@PM catalyst achieved a high ammonia yield of 7.43 mg h−1 mg cat.−1 and an excellent Faraday efficiency (FE) of 95.9%. The mechanism of NO3RR was investigated by analyzing electrolysis products and in situ Fourier transform infrared spectroscopy. Furthermore, the Co7Cu3@PM based ZnNO3− battery exhibited the superior power density of 5.59 mW cm−2 and an NH3 FE of 92.3%. This work presents an effective strategy to design MXene‐based high‐performance NO3RR electrocatalysts.

中文翻译：

---

双金属锚定多孔 MXene 纳米片，用于驱动串联催化高效电化学硝酸盐还原


电化学硝酸盐还原反应 （NO3RR） 被认为是氨合成和硝酸盐去除的一种很有前途的策略，其中催化剂开发至关重要。在此，通过结合刻蚀和还原策略制备了一系列双金属（Co 和 Cu）锚定多孔 MXene 纳米片 （CoxCuy@PM） 催化剂。一方面，Cu 和 Co 双金属为 NO3RR 提供了串联催化活性位点。另一方面，面内 PM 表现出良好的导电性和多条传输路径。因此，优化的Co7Cu3@PM催化剂实现了 7.43 mg h-1 mg cat.-1 的高氨产率和 95.9% 的优异法拉第效率 （FE）。通过分析电解产物和原位傅里叶变换红外光谱研究 NO3RR 的机制。此外，Co7Cu3@PM基 ZnNO3− 电池表现出 5.59 mW cm−2 的卓越功率密度和 92.3% 的 NH3 FE。这项工作提出了一种设计基于 MXene 的高性能 NO3RR 电催化剂的有效策略。