Xu Jian, Meng Zeshuo, Hao Zeyu, Sun Xucong, Nan Haoshan, Liu Hongxu, Wang Yanan, Shi Wei, Tian Hongwei, Hu Xiaoying
Key Laboratory of Automobile Materials of MOE and School of Materials Science and Engineering, Jilin University, Changchun 130012, China.
Key Laboratory of Automobile Materials of MOE and School of Materials Science and Engineering, Jilin University, Changchun 130012, China.
J Colloid Interface Sci. 2022 Mar;609:878-889. doi: 10.1016/j.jcis.2021.11.081. Epub 2021 Nov 18.
BiO is an outstanding electrode material due to its high theoretical specific capacity. Hence, the synthesis of δ-BiO materials with high oxygen-vacancy contents could improve their electrochemical performances but causes easy conversion to α-BiO 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-BiO on activated carbon fiber paper (ACFP) is developed in this study. To this end, ACFP/Bi(OH) is first synthesized by the solvothermal method and then converted to ACFP/α-BiO 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-BiO. Consequently, the specific capacity of ACFP/α-BiO reaches 906C g at 1 A g, and the capacity retention remains above 70% after 3000 cycles, a value higher than that of δ-BiO (45%). Furthermore, the hybrid supercapacitor device assembled by ACFP/α-BiO delivers a maximum energy density of 114.9 Wh kg at 900 W kg and outstanding cycle stability with 73.56 % retention after 5500 cycles. In sum, the proposed ACFP/α-BiO with high performance and good stability looks promising for use as bismuth-based anode materials in supercapacitors and aqueous batteries.
由于其较高的理论比容量，BiO是一种出色的电极材料。因此，合成具有高氧空位含量的δ-BiO材料可以改善其电化学性能，但容易转化为氧空位含量低的α-BiO，导致循环稳定性差和实际应用受限。为克服这些问题，本研究开发了一种在活性炭纤维纸（ACFP）上构建高氧空位α-BiO的有效策略。为此，首先通过溶剂热法合成ACFP/Bi(OH)，然后通过原位电化学活化将其转化为ACFP/α-BiO。所提出的创新电化学方法在保留三维结构的同时快速轻松地引入氧空位，从而促进ACFP/α-BiO中的电荷转移和离子扩散。因此，ACFP/α-BiO在1 A g时的比容量达到906C g，在3000次循环后容量保持率仍高于70%，该值高于δ-BiO（45%）。此外，由ACFP/α-BiO组装的混合超级电容器装置在900 W kg时的最大能量密度为114.9 Wh kg，并且具有出色的循环稳定性，在5500次循环后保留率为73.56%。总之，所提出的具有高性能和良好稳定性的ACFP/α-BiO有望用作超级电容器和水系电池中基于铋的负极材料。
