期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 44, 页码 23257-23264出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta07553a
关键词
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资金
- National Natural Science Foundation of China [21805051, 21875048]
- Outstanding Youth Project of Guangdong Natural Science Foundation [2020B1515020028]
- Major Scientific Project of Guangdong University [2017KZDXM059]
- Featured Innovation Project of Guangdong University [2017KQNCX154]
- Yangcheng Scholars Research Project of Guangzhou [201831820]
- Science and Technology Research Project of Guangzhou [202002010007]
- Research Fund Program of Key Laboratory of Fuel Cell Technology of Guangdong Province
Although manganese oxide (MnO2) has long been considered as a promising electrode material for pseudocapacitors due to its high theoretical capacity and large potential window, its rapid capacity fading severely impedes its further large-scale applications. Herein, an electron affinity regulation strategy is developed to inhibit the dissolution of Mn2+ during the charging and discharging process. Remarkably, fluoride (F-) substituted MnO2 (MnOF) nanosheets exhibit an exceptionally high durability (no obvious degradation after 100 000 cycles even at a high scan rate of 200 mV s(-1)) along with an enhanced capacitance in an aqueous (Na2SO4) electrolyte, which is superior to that of all the reported MnOx electrodes and comparable to that of carbon-based electrodes. DFT calculations and X-ray fine structure characterization reveal that the non-equilibrium F substitution in MnO2 induces the enhanced energy barrier (Delta G) of the Mn(III) disproportionation reaction and greatly stabilizes the Mn-O bond, which are the key in boosting cycling life.
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