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- Title
Sulphur‐Boosted Active Hydrogen on Copper for Enhanced Electrocatalytic Nitrate‐to‐Ammonia Selectivity.
- Authors
Xu, Yue; Cheng, Chuanqi; Zhu, Jiewei; Zhang, Bin; Wang, Yuting; Yu, Yifu
- Abstract
Electrocatalytic nitrate reduction to ammonia is a promising approach in term of pollutant appreciation. Cu‐based catalysts performs a leading‐edge advantage for nitrate reduction due to its favorable adsorption with *NO3. However, the formation of active hydrogen (*H) on Cu surface is difficult and insufficient, leading to the significant generation of by‐product NO2−. Herein, sulphur doped Cu (Cu−S) is prepared via an electrochemical conversion strategy and used for nitrate electroreduction. The high Faradaic efficiency (FE) of ammonia (~98.3 %) and an extremely low FE of nitrite (~1.4 %) are achieved on Cu−S, obviously superior to its counterpart of Cu (FENH3: 70.4 %, FENO2−: 18.8 %). Electrochemical in situ characterizations and theoretical calculations indicate that a small amount of S doping on Cu surface can promote the kinetics of H2O dissociation to active hydrogen. The optimized hydrogen affinity validly decreases the hydrogenation kinetic energy barrier of *NO2, leading to an enhanced NH3 selectivity.
- Subjects
ATOMIC hydrogen; COPPER; ACTIVATION energy; POLLUTANTS; DENITRIFICATION; KINETIC energy; ELECTROLYTIC reduction
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 16, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202400289