Co-precipitation synthesis of CuCo2O4 nanoparticles for supercapacitor electrodes with large specific capacity and high rate capability

Sun, Mengxuan, Fang, Qisheng, Li, Zhijie, Cai, Chao, Li, Hao, Cao, Baobao, Shen, Wenzhong, Liu, Xiaoteng and Fu, Yong Qing (2021) Co-precipitation synthesis of CuCo2O4 nanoparticles for supercapacitor electrodes with large specific capacity and high rate capability. Electrochimica Acta, 397. p. 139306. ISSN 0013-4686

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Abstract

Ultra-fine CuCo2O4 nanoparticles were synthesized using a facile co-precipitation method assisted by NaBH4 and CTAB, and they were explored as supercapacitor electrode material to achieve a large specific capacity and a high rate capability. The synthesized CuCo2O4–250 nanoparticles had a large surface area of 159.6 m2g−1, which provided numerous active sites to enhance their specific capacity. The abundant mesopores with a pore volume of 0.3599 cm3 g−1 effectively provided numerous channels for the electrolyte ions to diffuse onto the active surface of nanoparticles. The CuCo2O4–250 nanoparticles based electrodes exhibited both battery-type and capacitive-type behavior in the charging/discharging processes. It achieved a large specific capacity of 401.2 C g−1 at a current density of 0.5 A g−1 in 2 M KOH electrolyte. Results showed that when the current density was increased from 1 A g−1 to 10 A g−1, a retained specific capacity of 77.5% was achieved, indicating a good rate capability. An asymmetric supercapacitor with CuCo2O4–250 nanoparticles and activated carbon as positive and negative electrodes exhibited a high energy density of 29.5 Wh kg−1 at a power density of 832.6 W kg−1 and a capacity retention of 72.7% at 10 A g−1 after 10,000 cycles.

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