Facile synthesis of ultrathin Bi(OH)SO4•H2O nanosheets and battery-like electrode for symmetric supercapacitors

초록

The phase engineering of Bi(OH)SO4 center dot H2O nanosheets is proposed as a simple, adaptable, and cost-effective solution for the combustion of Bi2O3 using H2SO4. This study revealed that the formation of Bi(OH)SO4 center dot H2O with a nanosheet-like morphology. The synthesized nanosheets were employed as electrode materials for electrochemical storage devices. The estimated capacity of the Bi(OH)SO4 center dot H2O electrode is 327.69 mAh g(-1) at 1 A g(-1). Solid-state coin-cell-type symmetric supercapacitor devices (CSSDs) were developed. The fabricated CSSDs exhibit a high specific capacity (33 mAh g(-1) at 1.1 A g(-1)), energy density (62.23 Wh kg(-1)), and power density (2074.11 W kg(-1)) with a significant retained energy density of up to 32.98 Wh kg(-1) at 10794.51 W kg(-1). Furthermore, they exhibited cycling stability at 5.5 A g(-1), maintaining 76.65% of its initial capacity after 10,000 cycles. In addition, to investigate the device performance in real time, two CSSDs were connected in series to power a red LED. The obtained results provide insights into bismuth-based electrodes for energy storage applications. (c) 2022 Elsevier B.V. All rights reserved.

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