High-Performance MoO₃ Nanoplate Electrode for Asymmetric Supercapacitor with Long-Term Electrochemical Stability

Fengzhen Ji; Dan Jiang; Qiuyu Xia; Xuexue Pan; Xinman Chen; Yong Zhang

doi:10.1166/jnn.2019.16555

High-Performance MoO₃ Nanoplate Electrode for Asymmetric Supercapacitor with Long-Term Electrochemical Stability

J Nanosci Nanotechnol. 2019 Sep 1;19(9):5817-5824. doi: 10.1166/jnn.2019.16555.

Authors

Fengzhen Ji¹, Dan Jiang², Qiuyu Xia¹, Xuexue Pan¹, Xinman Chen¹, Yong Zhang¹

Affiliations

¹ Guangdong Engineering Technology Research Center of Optoelectronic Functional Materials and Devices, Institute of Optoelectronic Materials and Technology, South China Normal University, Guangzhou 510631, China.
² Research Resources Center of South China Normal University, South China Normal University, Guangzhou 510631, China.

PMID: 30961744
DOI: 10.1166/jnn.2019.16555

Abstract

In the present study, by controlling the content of ammonium molybdate via a facile hydrothermal method, we achieved MoO₃ electrodes with different morphologies, i.e., triangular nanoplates, triangular prisms and four prisms. As the electrode material of supercapacitors, the MoO₃ electrodes with triangular nanoplates show the highest specific capacitance (104 mAh g_-1 at 2 mA cm_-2) as well as a good cycling performance with 92.4% retention rate after 8000 cycles at 10 mA cm_-2. Subsequently, an asymmetric supercapacitor is fabricated using the MoO₃-0.15 and activated carbon (AC) as cathode and anode, respectively. The fabricated supercapacitor shows a high energy density of 24.8 Wh kg_-1 at a power density of 358 W kg_-1. Significantly, the device manifests a long-term cycling stability with retention rate of 103% even after 16000 cycles. According to the noted facts, the promising prospects of MoO₃ electrode for practical applications in supercapacitor are definitely confirmed.