Flexible Ti‐Doped FeOOH Quantum Dots/Graphene/Bacterial Cellulose Anode for High‐Energy Asymmetric Supercapacitors |
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| Authors: | Rong Liu Lina Ma Gudan Niu Xiaolong Li Enyuan Li Yang Bai Yang Liu Guohui Yuan |
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| Institution: | 1. IIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, P. R. China;2. Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, School of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, P. R. China |
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| Abstract: | Ti‐doped FeOOH quantum dots (QD) decorated on graphene (GN) sheets are designed and fabricated by a facile and scalable synthesis route. Importantly, the Ti‐doped FeOOH QD/GN are successfully dispersed within bacterial cellulose (BC) substrate as bending anode with large loading mass for flexible supercapacitor. By virtue of its favorable architecture, this composite electrode exhibits a remarkable areal capacitance of 3322 mF cm?2 at 2 mA cm?2, outstanding cycle performance (94.7% capacitance retention after 6000 cycles), and excellent mechanical strength (68.7 MPa). To push the energy density of flexible supercapacitors, the optimized asymmetric supercapacitor using Mn3O4/GN/BC as positive electrode and Ti‐doped FeOOH QD/GN/BC as negative electrode can be cycled reversibly in the operating voltage range of 0–1.8 V and displays ultrahigh areal energy density of 0.541 mWh cm?2, ultrahigh volumetric energy density of 9.02 mWh cm?3, reasonable cycling performance (9.4% decay in specific capacitance after 5000 cycles), and good capacitive retention at bending state. |
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| Keywords: | bacterial cellulose FeOOH quantum dots flexible supercapacitors Ti‐doping |
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