title: Novel Dual-Ion Hybrid Supercapacitor Based on a NiCo2O4Nanowire Cathode and MoO2-C Nanofilm Anode.
abstract: Cobalt/nickel-based compounds have been extensively used as cathode (positive electrode) materials in alkaline electrolyte for hybrid supercapacitors (HSCs). In these HSCs, however, the anodes (negative electrodes) are almost carbon-based materials that exhibit limited capacitance, leading to relatively low energy density of the device. Herein, we report a novel dual-ion HSC concept, that is, utilizing anion and cation in the electrolyte, respectively, by the two electrodes for charge storage, to promote the device's performance. Based on this, it is possible to exploit cation-consumed metal oxide as a capacitive anode to couple with a cobalt/nickel oxide cathode. As a demonstration, a 1.8 V MoO2-C/LiOH electrolyte/NiCo2O4HSC device is established. In such a design, NiCo2O4cathode and MoO2-C anode react with OH-and Li+, respectively, to store energy. With the benefits from enhanced kinetics in NiCo2O4nanowire array (direct electron transport pathway and sufficient electrolyte/ion penetration) and increased stability and electrical conductivity in carbon-encapsulated MoO2nanofilm, our device delivers a high capacitance (94.9 F g-1), high energy density and power density (41.8 Wh kg-1and 19922.2 W kg-1), long cycling stability >3000 times, and good rate capability (∼3.3 s charging/discharging with 43.6% capacitance retention). The dual-ion charge storage concept will stimulate great interest in the design of high-performing all-oxide hybrid electric energy storage systems.
authors: School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, P. R. China.
authors: Yuanyuan
authors: Y
authors: Li
authors: School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, P. R. China.
authors: Fan
authors: F
authors: Tang
authors: School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, P. R. China.
authors: Renjie
authors: R
authors: Wang
authors: School of Chemistry, Chemical Engineering and Life Sciences, and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Wuhan, Hubei 430070, China.
authors: Chong
authors: C
authors: Wang
authors: School of Chemistry, Chemical Engineering and Life Sciences, and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Wuhan, Hubei 430070, China.
authors: Jinping
authors: J
authors: Liu
keywords: dual-ion charge storage; hybrid supercapacitor; molybdenum dioxide; nanostructured electrode; nickel cobaltite