1. Electrical Pulse‐Driven Periodic Self‐Repair of Cu‐Ni Tandem Catalyst for Efficient Ammonia Synthesis from Nitrate.
- Author
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Bu, Yongguang, Wang, Chao, Zhang, Wenkai, Yang, Xiaohan, Ding, Jie, and Gao, Guandao
- Subjects
DENITRIFICATION ,COPPER ,WATER pollution ,CATALYSTS ,NITRATES ,AMMONIA - Abstract
Electrocatalytic nitrate reduction sustainably produces ammonia and alleviates water pollution, yet is still challenging due to the kinetic mismatch and hydrogen evolution competition. Cu/Cu2O heterojunction is proven effective to break the rate‐determining NO3−‐to‐NO2− step for efficient NH3 conversion, while it is unstable due to electrochemical reconstruction. Here we report a programmable pulsed electrolysis strategy to achieve reliable Cu/Cu2O structure, where Cu is oxidized to CuO during oxidation pulse, then regenerating Cu/Cu2O upon reduction. Alloying with Ni further modulates hydrogen adsorption, which transfers from Ni/Ni(OH)2 to N‐containing intermediates on Cu/Cu2O, promoting NH3 formation with a high NO3−‐to‐NH3 Faraday efficiency (88.0±1.6 %, pH 12) and NH3 yield rate (583.6±2.4 μmol cm−2 h−1) under optimal pulsed conditions. This work provides new insights to in situ electrochemically regulate catalysts for NO3−‐to‐NH3 conversion. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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