期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 46, 页码 24538-24551出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta07061h
关键词
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资金
- National Natural Science Foundation of China [51971119, 52171141]
- Natural Science Foundation of Shandong Province [ZR2020YQ32, ZR2020QB122]
- China Postdoctoral Science Foundation [2020M672054]
- Guangdong Basic and Applied Basic Research Foundation [2021A1515111124]
- Young Scholars Program of Shandong University [2019WLJH21]
- Project of Introducing Urgently Needed Talents in Key Supporting Regions of Shandong Province [2203-371703-04-01-786537]
In this study, NiO materials with different P doping contents were synthesized as cathode catalysts for Li-O-2 batteries. The introduction of P heteroatoms can improve reaction kinetics and regulate the formation/decomposition of intermediates, achieving superior electrochemical performance.
Rechargeable Li-O-2 batteries are a remarkable technology for electrical energy conversion and storage owing to their exceptionally high theoretical energy density versus that of commercial Li-ion batteries. However, this promising system still suffers from limited practical energy density, poor cycling stability, severe side reactions, high overpotentials, etc. In this work, NiO materials with different P doping contents were synthesized by hydrothermal and subsequent annealing methods, which served as cathode catalysts for Li-O-2 batteries. The introduction of P heteroatoms effectively rationalized the charge distribution on the P-NiO surfaces, enabling remarkable advancement of the reaction kinetics. This is because a large number of Ni-P coordination groups were produced as emerging catalytic sites, thus greatly reducing the Gibbs energy barriers during cycling. P-NiO also realizes superior electrochemical performance of Li-O-2 batteries by modulating the affinity for intermediates and regulating the formation/decomposition of conformal thin-film Li2O2 in discharge and charge processes. As expected, the P-NiO cathode delivered a remarkable electrochemical performance for Li-O-2 electrocatalysis. This research contributes to an in-depth understanding of the relationship between electronic structures on oxygen electrocatalyst surfaces and electrocatalytic activities in Li-O-2 batteries.
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