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- Title
Electron engineering of nickel phosphide for Ni<sup>δ+</sup> in electrochemical nitrate reduction to ammonia.
- Authors
Hu, Jie; Huang, Hao; Yu, Miao; Wang, Shuang; Li, Jinping
- Abstract
The electrochemical reduction of nitrate to ammonia (ENRA) provides an efficient approach to remove nitrate pollution and achieve ammonia production simultaneously. Herein, inspired by bio-enzyme in denitrifying bacteria, a carbon-coated nickel phosphide (NiPC) nanosheet derived from metal-organic frameworks (MOFs) is proposed as an efficient catalyst for ENRA. Through electron engineering, controllable Niδ+ in nickel phosphide is achieved by regulating the degree of phosphating, which enhances its activity for the hydrogenation of nitrate. As the result, Niδ+ becomes one of dominating factors determining the efficiency of the ENRA reaction in nickel phosphide. The optimal NiPC catalyst exhibits impressive property toward ENRA: NH4+ Faraday efficiency of 96.68%, NH4+ selectivity of 99.04%, and nitrate conversion rate of 90.43% under low nitrate concentration (200 mgL−1). This work opens a new avenue for the design of next-generation catalysts through electron engineering for ENRA.
- Subjects
NICKEL phosphide; ELECTROLYTIC reduction; AMMONIA; ELECTRONS; METAL-organic frameworks; DENITRIFYING bacteria; DENITRIFICATION
- Publication
Nano Research, 2024, Vol 17, Issue 6, p4864
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-024-6470-3