期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 45, 页码 20571-20581出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c05247
关键词
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资金
- Natural Science Foundation Program of Beijing [2202031, 2174079, 2162027]
- National Natural Science Foundation Program of China [51574030, 51574029, 51604240]
- Key Research and Development Project of Hebei Province [20311001D]
- Fundamental Research Funds for the Central Universities [2050205, FRF-IDRY-20-022, FRF-TP-19-015A3, FRF-TP-19-003C2, FRF-TP-17-034A2]
- Postdoctorol Research Foundation of Shunde Graduate School of University of Science and Technology Beijing [2020BH014]
This study develops a new strategy to prepare bifunctional Mo SACs with O/S co-coordination, which exhibit high ORR activity and low OER overpotential. The catalyst shows excellent performance when assembled in a Zn-air battery.
The highly efficient bifunctional catalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is the key to achieving highperformance rechargeable Zn-air batteries. Non-precious-metal single-atom catalysts (SACs) have attracted intense interest due to their low cost and very high metal atomic utilization; however, high-activity bifunctional non-precious-metal SACs are still rare. Herein, we develop a new nanospace-confined sulfur-enamine copolymerization strategy to prepare a new type of bifunctional Mo SACs with O/S co-coordination (MoO2S2-C) supported on the multilayered, hierarchically porous hollow tubes. The as prepared catalyst can not only expose more active sites and facilitate mass transfer due to their combined micropores, mesopores, and macropores but also have the S/O co coordination structure for optimizing the adsorption energies of the ORR intermediates. Its ORR activity is among the highest, and it shows a low overpotential of 324 mV for the OER at 10 mA cm-2 in all of the reported Mo-based catalysts. When assembled in a Zn-air battery, it exhibits a high maximal power density of 197.3 mW cm-2 and a long service life of 50 hours, superior to those of Zn-air batteries using commercial Pt/C +IrO2.
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