Journal
DALTON TRANSACTIONS
Volume 47, Issue 23, Pages 7747-7753Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt00740c
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Funding
- National Natural Science Foundation of China [51702369]
- Hubei Major Projects of Technological Innovation [2017AAA131]
- Central College Fund [CZQ18003]
- Hubei Provincial Natural Science Foundation of China [2018CFA023]
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In this work, hollow RuO2 nanotube arrays were successfully grown on carbon cloth by using a facile two-step method to fabricate a binder-free electrode. The well-aligned electrode displays excellent electrochemical performance. By using RuO2 hollow nanotube arrays as the positive electrode and Fe2O3 as the negative electrode, a flexible solid-state asymmetric supercapacitor (ASC) has been fabricated which exhibited excellent electrochemical performance, such as a high capacitance of 4.9 F cm(-3), a high energy density of 1.5 mW h cm(-3) and a high power density of 9.1 mW cm(-3). In addition, the two-electrode SC shows high cycling stability with 97% capacitance retention after 5000 charge-discharge cycles. These excellent electrochemical performances are ascribed to the unique hollow structural design of electrodes, which can shorten the ion diffusion length, provide a fast ion transport channel, and offer a large electrode/electrolyte interface for the charge-transfer reaction. The structural design and the synthesis approach are general and can be extended to synthesizing a broad range of materials systems.
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