Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 306, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121094
Keywords
Pd-Cu2O; Hierarchical defects; Nitrate electroreduction; Ammonia synthesis; Conner-etched octahedra
Funding
- National Natural Science Foundation of China [21701141, 21972126, 21978264, 21905250]
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This study designs a low-content Pd-Cu2O CEO catalyst for electrochemical NO3--to-NH3 transformation, which exhibits unique structural features and active sites, enabling efficient and selective ammonia synthesis.
Electrochemical reduction of nitrate (NO3-) to ammonia (NH3) offers a sustainable avenue to close the NO3- cycle for NH3 synthesis. Critical to the feasibility of electrochemical NO3--to-NH3 technology is the development of cost-effective, scalable and selective catalysts that can produce NH3 with high yield. To this end, we design and constructure ultralow-content Pd (2.93 at%) in-situ incorporated Cu2O corner-etched octahedra (Pd-Cu2O CEO) with cavity and oxygen vacancy defects for selectively electrochemical NO3--to-NH3 transformation. The unique conner-etched cavity structure, rich surface oxygen vacancies, and Pd-Cu2O dual active sites, synergistically promote nitrate electroreduction undergo ammonia formation reaction pathway. Impressively, the as-made Pd-Cu2O CEO exhibited outstanding activity for electrocatalytic NO3--to-NH3, with high ammonia selectivity (95.31%) and Faradaic efficiency (96.56%). The developed hierarchical-defect strategy may open a new avenue for reasonable design of defect electrocatalysts to contribute desirable properties and functionalities in specific applications.
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