Enhanced energy density of a supercapacitor using 2D CoMoO4 ultrathin nanosheets and asymmetric configuration

Yunxuan Zhao; Zailun Liu; Wenhao Gu; Yifei Zhai; Yiran Teng; Fei Teng

doi:10.1088/0957-4484/27/50/505401

Enhanced energy density of a supercapacitor using 2D CoMoO₄ ultrathin nanosheets and asymmetric configuration

Nanotechnology. 2016 Dec 16;27(50):505401. doi: 10.1088/0957-4484/27/50/505401. Epub 2016 Nov 17.

Authors

Yunxuan Zhao¹, Zailun Liu, Wenhao Gu, Yifei Zhai, Yiran Teng, Fei Teng

Affiliation

¹ Jiangsu Engineering and Technology Research Center of Environmental Cleaning Materials (ECM), Nanjing University of Information Sciences & Technology, Nanjing 210044, People's Republic of China. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (AEET), Nanjing University of Information Sciences & Technology, Nanjing 210044, People's Republic of China. School of Environmental Science and Engineering, Nanjing University of Information Sciences & Technology, Nanjing 210044, People's Republic of China.

PMID: 27855122
DOI: 10.1088/0957-4484/27/50/505401

Abstract

Developing a high energy density micro-supercapacitor still remains a big challenge. In this paper, a two-dimensional (2D) CoMoO₄ ultrathin nanosheet (NS)-based asymmetric supercapacitor (ASC) is fabricated. It is found that the CoMoO₄ NS electrode processes a high specific capacitance (153.2 F g^-1) at a current density of 1 mA cm^-2 and this ASC can deliver an energy density of 0.313 mWh cm^-3 at a power density of 80 mW cm^-3, which is higher than that reported in the literature. Moreover, the ASC can drive a light emitting diode (3 mm diameter, red) to work for 6 min after being charged for 10 s. After 5000 cycles, 77.37% of capacitance still remains. We maintain that the ultrathin thickness can significantly shorten the diffusion paths for both electrons and ions, thus leading to fast electron transport and ion diffusion rates. Our results demonstrate that 2D ultrathin NSs could be a new, promising candidate for energy conversion/storage devices, which could offer more accommodating sites for ion intercalation.