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Low-crystalline Tungsten Trioxide Anode with Superior Electrochemical Performance for Flexible Solid-state Asymmetry Supercapacitor

Abstract

Previous researches on pseudocapacitive anode have been focused on well-crystalline transition metal oxide and their cycling stability and rate performance is often limited by the difficulty in contracting or expanding, sluggish ion diffusion and penetration restrictions. Here, the effects of crystallinity on the electrochemical properties of WO3 are investigated by comparing the behavior of low-crystalline tungsten trioxide (LC-WO3) with high-crystalline tungsten trioxide (HC-WO3). The results show that LC-WO3 with plenty structural defects and disorder provides facilitated redox reactions and capacitive-dominant energy storage property, thus offering higher specific capacitance (474 F/g) and enhanced capacitance retention performance compared to HC-WO3. Further assembling a flexible solid-state asymmetry SC, based on LC-WO3 in-situ grown on porous carbon cloth, achieves an energy density of 7.6 mWh/cm3 and excellent cycling stability with 92% capacitance retention after 10,000 cycles. These results demonstrate a new approach for developing high-performance pseudocapacitive anode materials for advanced SCs, and hold promise for low-cost flexible electronics.

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Publication details

The article was received on 07 Feb 2018, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01323C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Low-crystalline Tungsten Trioxide Anode with Superior Electrochemical Performance for Flexible Solid-state Asymmetry Supercapacitor

    J. Chen, H. Wang, J. Deng, C. Xu and Y. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01323C

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