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Wide-pH-range adaptable ammonia electrosynthesis from nitrate on Cu-Pd interfaces.
- Source :
- SCIENCE CHINA Chemistry; Mar2023, Vol. 66 Issue 3, p913-922, 10p
- Publication Year :
- 2023
-
Abstract
- Ammonia production via electrochemical nitrate reduction is essential for environmental protection and the emerging hydrogen economy. Complex nitrate wastewater with a wide pH range calls for flexible catalysts with high selectivity. A high Faradaic efficiency (FE) of NH<subscript>3</subscript> cannot be obtained under strong acid or alkaline conditions due to the uncontrollable adsorption energy and coverage of hydrogen species (H*) on active sites. This article describes the design and fabrication of a copper-palladium (Cu-Pd) alloy nanocrystal catalyst that inhibits H<subscript>2</subscript> and nitrite generation in electrolytes with different nitrate concentrations and varied pH. The interfacial sites of Cu-Pd alloys could enhance the adsorption energy and coverage of H* while increasing the reaction rate constant of NO<subscript>2</subscript>*-to-NO*, which achieves a rapid conversion of NO<subscript>2</subscript>* along with a decreased FE of NO<subscript>2</subscript><superscript>−</superscript>. Under ambient conditions, optimal FE(NH<subscript>3</subscript>) is close to 100% at a wide pH range, with the solar-to-chemical conversion efficiency approaching 4.29%. The combination of thermodynamics and kinetics investigations would offer new insights into the reduction mechanism of NO<subscript>2</subscript>* for further development of nitrate reduction. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16747291
- Volume :
- 66
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- SCIENCE CHINA Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 161963387
- Full Text :
- https://doi.org/10.1007/s11426-022-1411-0