期刊
ACS OMEGA
卷 6, 期 39, 页码 25138-25150出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c02139
关键词
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资金
- 90th Anniversary of Chulalongkorn University (Ratchadaphiseksomphot Endowment Fund)
Nickel-cobalt carbonate hydroxide with a three-dimensional sea-urchin-like structure was successfully synthesized by the hydrothermal process, enhancing charge/ion diffusion for supercapacitor electrodes. The optimized nickel/cobalt mole ratio led to the highest specific capacitance and excellent cycling stability of the electrode.
Nickel-cobalt carbonate hydroxide with a three-dimensional (3D) sea-urchin-like structure was successfully developed by the hydrothermal process. The obtained structure enables the enhancement of charge/ion diffusion for the high-performance supercapacitor electrodes. The mole ratio of nickel to cobalt plays a vital role in the densely packed sea-urchin-like structure formation and electrochemical properties. At optimized nickel/cobalt mole ratio (1:2), the highest specific capacitance of 950.2 F g(-1) at 1 A g(-1) and the excellent cycling stability of 178.3% after 3000 charging/discharging cycles at 40 mV s(-1) are achieved. This nickel-cobalt carbonate hydroxide electrode yields an energy density in the range of 42.9-15.8 Wh kg(-1), with power density in the range of 285.0-2849.9 W kg(-1). The charge/discharge mechanism at the atomic level as monitored by time-resolved X-ray absorption spectroscopy (TR-XAS) indicates that the high capacitance behavior in a nickel-cobalt carbonate hydroxide is mainly dominated by cobalt carbonate hydroxide.
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