Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 298, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120605
Keywords
Covalent organic networks; Edge-sites engineering; Hydrogen peroxide production; Active-sites control; High selectivity
Funding
- Shanghai Pujiang Program [19PJ1410400]
- National Natural Science Foundation of China (NSFC) [U1732267, 21972163, 22065107, 22002184]
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences [IAGM2020C16]
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This study demonstrates a novel strategy to construct catalysts with controllable density and location of active sites by edge-defect engineering of covalent organic networks (CONs), achieving high activity and selectivity in hydrogen peroxide electrochemical synthesis. The optimized catalyst design provides valuable insights for regulating edge-defective properties of CONs in catalyst design.
Electrochemical synthesis of hydrogen peroxide is significant in energy systems, and many efforts have been made to develop highly selective and active carbon-based catalysts. However, it is still a challenge to control the local and density of active sites in carbons precisely. Herein, we demonstrate a novel tactic to construct catalysts with controllable density and location of active sites and well-defined active ability by edge-defect engineering of covalent organic networks (CONs). The optimized catalyst with dangling carbonyl group displays notable activity in catalyzing oxygen reduction reaction with a 2e- pathway, and a selectivity of above 99 %, with a faradaic efficiency of 93 %. Density functional theory calculations further reveal that the carbons next to carbonyl group on the edges enhance the binding ability of OOH*, which contributes to the high activity and selectivity. This work provides a general insight of designing H2O2 electrosynthesis catalysts through regulating the edge-defective properties of CONs.
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