期刊
CATALYSIS TODAY
卷 351, 期 -, 页码 113-118出版社
ELSEVIER
DOI: 10.1016/j.cattod.2018.10.056
关键词
Porphyrins; Electronic coupling; Substrate; Oxygen reduction; Oxygen evolution; Overpotential
资金
- NCI National Facility
- Pawsey Supercomputing Centre through the National Computational Merit Allocation Scheme - Australian Government
- Government of Western Australia
- Australian Research Council [DP130102420, DP170103598]
Metal porphyrins have received sustained attention due to their remarkable catalytic properties. However, the catalytic activities of porphyrins are still moderate for oxygen reduction /evolution (ORR/OER) due to the high binding energies between the catalyst and reactant. Herein, we propose a novel strategy to modulate the binding energies of the oxygenated intermediates by introducing electron coupling between the substrate and the metal porphyrin. Our results reveal remarkable enhancement of OER/ORR performance when the Co-porphyrin molecule is supported on the graphene/Ni (111) substrate. The ORR/OER overpotentials can be greatly reduced, in particular for ORR from 0.6 V to 0.31 V. The enhanced ORR/OER activity of Co-porphyrin/graphene/Ni system stems from the electronic coupling between the catalyst and the substrate that modulates the binding strength between catalytic active sites and the reaction intermediates. Our study represents an efficient strategy to design low-cost, high performance, bifunctional electrocatalysts for the application in rechargeable metal-air batteries.
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