High-quality Porous Cobalt Monoxide Nanowires @ Ultrathin Manganese dioxide Sheets Core-Shell Nanowire Arrays on Ni Foam for High-Performance Supercapacitor

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• 作者：Xuezhao Wang^a ; Yuanhua Xiao^b ; ^{yuanhua_xiao@163.com" class="auth_mail" title="E-mail the corresponding author} ; ^{yuanhua_xiao@126.com" class="auth_mail" title="E-mail the corresponding author} ; Dangcheng Su^b ; Liming Zhou^b ; Shide Wu^b ; Lifeng Han^a ; ^b ; Shaoming Fang^b ; ^{mingfang@zzuli.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shaokui Cao^a ; ^{caoshaokui@zzu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CoO ; MnO2 ; Nanoarray ; Core-shell ; Asymmetric supercapacitors
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 March 2016
• 年：2016
• 卷：194
• 期：Complete
• 页码：377-384
• 全文大小：2381 K

文摘

A new core-shell nanostructure of CoO@MnO₂nanowire@nanosheetarrays(NNSs) was designed and directly grown on a 3D nickel foam by a simple two step solution method combined with a post annealing treatment in Ar gas. The MnO₂ nanosheets can grow directly on the CoO precuor nanowires without any pretreatment, and its thickness on the CoO nanowire arrays (NAs) can also be tailored by easily adjusting the second step hydrothermal time. When acting as a electrochemical supercapacitor, the CoO@MnO₂ NNAs delivers a highly enhanced specific capacitance of 3.03 F cm⁻² (about 1515 F g⁻¹) with a wide potential window of 0.8 V at 2.0 mA cm⁻², which is superior to most reported Co₃O₄ based core-shell NNAs supercapacitive electrodes. An asymmetric supercapacitor devices based on these CoO@MnO₂ NNAs and aqueous electrolyte showed with a high-energy density of 0.37 mWh cm⁻² at a power density of 1.7 mW cm⁻², a high power density of 34.4 mW cm⁻² at 0.20 mWh cm⁻² and a long-term cycling ability, implying its great potential application in high-performance electrochemical supercapacitor.