Hierarchical CoMoO4 nanoneedle electrodes for advanced supercapacitors and electrocatalytic oxygen evolution. (1st January 2018)

• Record Type: Journal Article
• Authors: Fang, Linxia; Wang, Fan; Zhai, Tianli; Qiu, Yan; Lan, Mengdi; Huang, Kejing; Jing, Qiangshan
• Is Part Of: Electrochimica acta. Volume 259(2018)
• Page Start: 552
• Page End: 558
• Publication Date: 2018-01-01
• Subjects: CoMoO4 -- Supercapacitor -- Oxygen evolution reaction -- Electrocatalysis; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.11.012
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A novel hierarchical architecture of CoMoO4 nanoneedle with high electrochemical performance was synthesized using a facile one-step hydrothermal method. As the active electrode material in supercapacitors, it exhibited a large specific capacitance (1628.1 C g −1 at a current density of 2 mA cm −2 ), a high rate capability (874.8 C g −1 at 50 mA cm −2 ), and superior cycling stability (90.54% capability retention after 5000 cycles at 10 mA cm −2 ). Moreover, as an electrocatalyst for the oxygen evolution reaction (OER), the CoMoO4 nanoneedle exhibited an early onset potential of 1.37 V, a small Tafel slope of 66 mV Dec −1, and a low overpotential of 235 mV at the current density of 10 mA cm −2 . The excellent electrochemical performance of the hierarchical CoMoO4 structure was attributed to its porosity and the characteristics of the 2D nanosheet subunits that possess many active reaction sites, rapid electron/ion transport, and high stability. The synthetic strategy used in the present study is simple, cost-effective, and generalizable. It can be used to develop effective electrode materials for large-scale energy storage and conversion applications. Highlights: A hierarchical CoMoO4 nanoarchitecture was synthesized. The novel nanoarchitecture was constructed by CoMoO4 nanoneedle subunit. The hierarchical CoMoO4 manifests multi-functional electrochemical performances. They deliver excellent supercapacitor performance. They exhibit remarkable electrocatalytic activity to OER.