1. Oxygen-vacancy abundant alpha bismuth oxide with enhanced cycle stability for high-energy hybrid supercapacitor electrodes.
- Author
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Xu, Jian, Meng, Zeshuo, Hao, Zeyu, Sun, Xucong, Nan, Haoshan, Liu, Hongxu, Wang, Yanan, Shi, Wei, Tian, Hongwei, and Hu, Xiaoying
- Subjects
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SUPERCAPACITORS , *SUPERCAPACITOR electrodes , *BISMUTH trioxide , *ENERGY density , *CARBON paper , *CHARGE transfer , *BISMUTH telluride - Abstract
A novel electrochemical activation method was used to convert Bi(OH) 3 into α-Bi 2 O 3 with abundant oxygen vacancies. This material has a high specific capacitance and more persistent cycling stability than δ-Bi 2 O 3.When assembled into a hybrid supercapacitor, it shows an energy density of up to 114.9 Wh kg−1. [Display omitted] Bi 2 O 3 is an outstanding electrode material due to its high theoretical specific capacity. Hence, the synthesis of δ-Bi 2 O 3 materials with high oxygen-vacancy contents could improve their electrochemical performances but causes easy conversion to α-Bi 2 O 3 with low oxygen-vacancy contents, leading to poor cycling stability and limited practical applications. To overcome these problems, an effective strategy for constructing high oxygen vacancies α-Bi 2 O 3 on activated carbon fiber paper (ACFP) is developed in this study. To this end, ACFP/Bi(OH) 3 is first synthesized by the solvothermal method and then converted to ACFP/α-Bi 2 O 3 by in situ electrochemical activation. The proposed innovative electrochemical method quickly and easily introduces oxygen vacancies while preserving the three-dimensional structure, thereby promoting the charge transfer and ions diffusion in ACFP/α-Bi 2 O 3. Consequently, the specific capacity of ACFP/α-Bi 2 O 3 reaches 906C g−1 at 1 A g−1, and the capacity retention remains above 70% after 3000 cycles, a value higher than that of δ-Bi 2 O 3 (45%). Furthermore, the hybrid supercapacitor device assembled by ACFP/α-Bi 2 O 3 delivers a maximum energy density of 114.9 Wh kg−1 at 900 W kg−1 and outstanding cycle stability with 73.56 % retention after 5500 cycles. In sum, the proposed ACFP/α-Bi 2 O 3 with high performance and good stability looks promising for use as bismuth-based anode materials in supercapacitors and aqueous batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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