期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 126, 期 22, 页码 9248-9256出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.2c01455
关键词
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资金
- National Natural Science Foundation of China [22008063, 21878078]
- Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology [2020Z002]
This study investigates the surface wettability effect on the energy density and power density of electrochemical supercapacitors using density functional theory. The results show that adjusting the surface wettability can increase energy density but decrease power density, and optimal energy density can be achieved with highly confined pores. Increasing ion concentration and surface voltage can enhance both energy density and power density of the supercapacitors.
Many attempts have been made to improve the energy density of supercapacitors toward their large-scale applications in storing renewable energy. Herein, the surface wettability effect is unraveled with the combination of static and dynamic density functional theories through which the energy densities and power densities of electrochemical supercapacitors are analyzed with different sets of pore sizes, surface voltages, and bulk ion concentrations. We demonstrate that tuning the surface wettability of electrodes may improve the energy density but simultaneously reduce the power density, and an optimal energy density with a relatively small cost of power density can be achieved by adopting highly confined pores. In addition, increasing ion bulk concentration and/or surface voltage can enhance both the energy density and power density. This work provides a complementary dynamic insight into the surface wettability effect on the performance of supercapacitors.
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