期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 24, 页码 13926-13935出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta02330f
关键词
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资金
- Tianjin Natural Science Foundation for Distinguished Young Scholar [18JCJQJC46500]
- National Natural Science Foundation for Excellent Young Scholar [51722403]
- National Natural Science Foundation of China
- National Natural Science Foundation of Guangdong Province [U1601216]
- National Youth Talent Support Program
The study presents a novel electrocatalyst composed of nitrogen/sulfur-codoped carbon nanosheets decorated with Co9S8/Co1-xS heterostructures, prepared by a salt template-assisted pyrolysis method. The heterostructure enhances the adsorption/desorption behaviors of intermediates in oxygen reduction and evolution reactions, leading to improved bifunctional electrocatalytic performance.
The rational design and controllable synthesis of excellent bifunctional oxygen reduction and evolution reaction (ORR/OER) electrocatalysts are of vital importance for zinc-air battery applications. Herein, we report nitrogen/sulfur-codoped carbon nanosheets (NSC) decorated with dense Co9S8/Co1-xS heterostructures (Co9S8/Co1-xS@NSC), prepared by a one-pot salt template-assisted pyrolysis procedure. The population of the Co9S8/Co1-xS heterostructure can be effectively controlled by tuning the precursor components. Salt templates constructed hierarchical porosity for the wide-open carbon nanosheets, which maximized the N functional groups to anchor highly dispersive Co9S8/Co1-xS species. Experiments and theoretical simulations revealed notable electronic interactions within Co9S8/Co1-xS interfaces, which can effectively optimize the adsorption/desorption behaviors of intermediates in ORR/OER, thus promoting the bifunctional electrocatalytic performance. The half-wave potential for the ORR of 0.86 V and the OER electrocatalytic potential of 1.52 V at 10 mA cm(-2) were obtained. Benefiting from the strong coupling effect between the Co9S8/Co1-xS species and the carbon substrate, superior durability was obtained for 2000 ORR/OER cycles. The practical zinc-air battery based on the Co9S8/Co1-xS@NSC cathode manifested a high open-circuit voltage, small voltage gap and robust reversibility. Our study revealed the great potential of the bi-elemental (Co and S) heterostructure in enhancing the ORR/OER activity, which suggests a logical extension to other electrocatalysis systems.
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