High performance energy storage electrodes based on 3D Z-CoO/RGO nanostructures for supercapacitor applications

Xiaoting Zha, Zhaokun Wu, Zhengfu Cheng, Wenyao Yang, Jie Li, Yan Chen, Liu He, Enmin Zhou and Yajie Yang

Energy, 2021, vol. 220, issue C

Abstract: In this paper, by precisely tuning the structure of composite, a 3D silkworm cocoon-like composite material based on reduced graphene oxide (RGO) and Z-CoO (with a ZIF-67 as precursor) are prepared through a in situ hydrothermal method. This Z-CoO/RGO nanocomposite exhibits a highly opened nanostructure and high conductive capability. The electrochemical performance reveals that an outstanding mass specific capacity (275 F g−1 at current density of 1 A g−1), which is much higher than the pure ZIF-67 with 2.7 F g−1, and excellent resistance characteristic are obtained due to the excellent synergistic effect between the MOFs and RGO. Moreover, a hybridized asymmetric supercapacitor with Z-CoO/RGO as anode and active carbon as cathode is constructed. The device shows ultra-low resistance (the equivalent-series resistance and the charge-transfer resistance are 1.13 Ω and 0.43 Ω, respectively) and stable cycle life about 1000 times is observed. This Z-CoO/RGO electrode also presents high current loading performance for possible high-power density type devices. Our work reveals that the straightforward hydrothermal treatment is a promising method for the preparation of dedicated MOFs complex nanostructure for high performance supercapacitor electrode applications.

Keywords: Silkworm cocoon-like; CoO; RGO; ZIF-67 ramification; Electrode material; Supercapacitor (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328036

DOI: 10.1016/j.energy.2020.119696

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