超级电容器
材料科学
纳米结构
电化学
介孔材料
成核
纳米技术
阳极
化学工程
纳米晶
水热合成
电极
阴极
储能
热液循环
化学
催化作用
生物化学
功率(物理)
物理
有机化学
物理化学
量子力学
工程类
作者
Qingqing Ke,Minrui Zheng,Huajun Liu,Cao Guan,Lu Mao,John Wang
摘要
Three dimensional hierarchical nanostructures have attracted great attention for electrochemical energy storage applications. In this work, self-supported TiO2@Ni(OH)2 core-shell nanowire arrays are prepared on carbon fiber paper via the combination of hydrothermal synthesis and chemical bath deposition. In this core-shell hybrid, the morphology and wall size of the interconnected nanoflake shell of Ni(OH)2 can be tuned through adjusting the concentration of ammonia solution. Heterogeneous nucleation and subsequent oriented crystal growth are identified to be the synthesis mechanism affecting the nanostructure of the shell material, which consequently determines the electrochemical performance in both energy storage and charge transfer. Superior capabilities of 264 mAh g(-1) at 1 A g(-1) and 178 mAh g(-1) at 10 A g(-1) are achieved with the core-shell hybrids of the optimized structure. The asymmetric supercapacitor prototype, comprising of TiO2@Ni(OH)2 as the anode and mesoporous carbons (MCs) as the cathode, is shown to exhibit superior electrochemical performance with high energy and power densities. The present work provides a clear illustration of the structure-property relationship in nanocrystal synthesis and offers a potential strategy to enhance the battery type Ni(OH)2 electrode in a hybrid supercapacitor device.
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