Hydrogenated ZnO Core鈥揝hell Nanocables for Flexible Supercapacitors and Self-Powered Systems

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• 作者：Peihua Yang ; Xu Xiao ; Yuzhi Li ; Yong Ding ; Pengfei Qiang ; Xinghua Tan ; Wenjie Mai ; Ziyin Lin ; Wenzhuo Wu ; Tianqi Li ; Huanyu Jin ; Pengyi Liu ; Jun Zhou ; Ching Ping Wong ; Zhong Lin Wang
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：March 26, 2013
• 年：2013
• 卷：7
• 期：3
• 页码：2617-2626
• 全文大小：619K
• 年卷期：v.7,no.3(March 26, 2013)
• ISSN：1936-086X

文摘

Although MnO₂ is a promising material for supercapacitors (SCs) due to its excellent electrochemical performance and natural abundance, its wide application is limited by poor electrical conductivity. Inspired by our results that the electrochemical activity and electrical conductivity of ZnO nanowires were greatly improved after hydrogenation, we designed and fabricated hydrogenated single-crystal ZnO@amorphous ZnO-doped MnO₂ core鈥搒hell nanocables (HZM) on carbon cloth as SC electrodes, showing excellent performance such as areal capacitance of 138.7 mF/cm² and specific capacitance of 1260.9 F/g. Highly flexible all-solid-state SCs were subsequently assembled with these novel HZM electrodes using polyvinyl alcohol/LiCl electrolyte. The working devices achieved very high total areal capacitance of 26 mF/cm² and retained 87.5% of the original capacitance even after 10鈥?00 charge/discharge cycles. An integrated power pack incorporating series-wound SCs and dye-sensitized solar cells was demonstrated for stand-alone self-powered systems.

Keywords:

supercapacitors; hydrogenation; core鈭抯hell; flexible; self-powered; ZnO