Ruthenium‐Doped Copper Nanowires for Nitrite/Nitrate to Ammonia Conversion and Their Integration in Zinc–Nitrite Batteries

作者：Tobias Rios‐Studer, Zhengfan Chen, Christean Nickel, Fan Feng, Kevin Sowa, Ekemena O. Oseghe, Sina Sadigh Akbari, Sarra Rahali, Leon Prädel, Ingo Lieberwirth, Guangjin Zhang, Dandan Gao, Rongji Liu, Carsten Streb · 发表于：ChemCatChem · 年份：2024 · DOI：10.1002/cctc.202401690 · 被引用次数：5 · 研究领域：Ammonia Synthesis and Nitrogen Reduction、Advanced Photocatalysis Techniques、Nanomaterials for catalytic reactions

Abstract The electrochemical reduction of nitrite (NO 2 − ) and nitrate (NO 3 − ) not only enables sustainable, circular routes to produce ammonia (NH 3 ), but also eliminates pollutants in groundwater. In this article, we report a facile synthesis of Ru‐doped Cu nanowires on Cu foam electrodes with low Ru (0.48 wt.%) loading. The composite electrode shows high‐performance in the NO 2 − /NO 3 − to NH 3 electroreduction, giving NH 3 Faradaic efficiency of up to 100% and NH 3 yield rates up to 33.2 mg h −1 cm −2 at −0.2 V versus RHE in NO 2 − reduction. For the nitrate‐to‐ammonia reduction, the electrode also shows high activity with Faradaic efficiency of 88.4% (at −0.6 V versus RHE) and a yield rate of 62.5 mg h −1 cm −2 (at −1.0 V versus RHE). We show that the electrode can easily be integrated into a Zn–nitrite battery, giving a power density of 9.1 mW cm −2 , a NH 3 yield rate of 1.88 mg h −1 cm −2 and a nitrite‐to‐ammonia Faradaic efficiency of 88.9% at a current density of 20 mA cm −2 . The system combines three productive outputs, that is removal of NO x − pollutants, synthesis of valuable NH 3 and generation of “green” electricity.