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Electrochemical Reduction of Nitrates on CoO Nanoclusters‐Functionalized Graphene with Highest Mass Activity and Nearly 100% Selectivity to Ammonia.
- Source :
- Advanced Energy Materials; 5/5/2023, Vol. 13 Issue 17, p1-12, 12p
- Publication Year :
- 2023
-
Abstract
- NO3− is a prominent waste byproduct in ammunition industries, and valorization of NO3− into NH3 is desired. NH3 synthesized from waste using renewable energy could be used as an energy storage medium. For such a process, higher selectivity, stability, and enhanced activity per unit mass of catalyst is required. This work reports CoO nanoclusters functionalized on graphene as an efficient catalyst for electrochemical NO3− reduction to NH3 with >98% NH3 Faradaic efficiency and an NH3 current density (geometric) of ≈400 mA cm−2. A highest NH3 yield of 25.63 mol g−1 h−1 is obtained. The developed catalyst prevents the NN coupling step which is required for promoting the selectivity of NH3 over N2. Density functional theory calculations reveal that CoO NC/graphene has similar selectivity to that of polycrystalline Co and that higher activity can be obtained with lower catalyst loading. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16146832
- Volume :
- 13
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- Advanced Energy Materials
- Publication Type :
- Academic Journal
- Accession number :
- 163567809
- Full Text :
- https://doi.org/10.1002/aenm.202204236