Battery-like bismuth oxide anodes for soft-packed supercapacitors with high energy storage performance. Issue 8 (26th January 2023)

• Record Type: Journal Article
• Authors: Xiao, Qindan; Zhu, Juncheng; Cheng, Chang; Liu, Jianpeng; Zhang, Xiaohan; Li, Zhong; Zhu, Jiliang
• Is Part Of: Nanoscale. Volume 15:Issue 8(2023)
• Page Start: 3884
• Page End: 3892
• Publication Date: 2023-01-26
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr07096k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The soft-packed supercapacitor, assembled with Bi2 O3 and Ni(OH)2, has an extremely high energy and power density. Connecting the two supercapacitors in series as a power source can light up the "SCU" LED sign and drive a tiny fan. Abstract : Bismuth compounds are of interest because of abundant reserves and high theoretical capacity for use as anodes in supercapacitors. In this work, bismuth oxycarbonate is synthesized by a hydrothermal method, and bismuth oxide is obtained by the subsequent calcination process, both of which possess high specific capacity. In particular, Bi2 O3 possesses a specific capacity of 1178 F g −1 (1178 C g −1, 327 mA h g −1 ) at a current density of 1 A g −1, and still retains 94.9% capacity at 20 A g −1, indicating excellent rate capability. Furthermore, Ni(OH)2 is prepared with a specific capacity of 2447 F g −1 at 1 A g −1 . Using Bi2 O3 as the anode and Ni(OH)2 as the cathode, respectively, the soft-packed supercapacitors are assembled with a large voltage window of 1.75 V. The energy density is as high as 139.7 W h kg −1 at a power density of 874.8 W kg −1 . Even at 18 000 W kg −1, the device retains an energy density of 94 W h kg −1 . Connecting two devices in series as a power source can light up 88 light emitting diodes (LEDs) for 2 hours, and drive a tiny fan to run for 18 seconds. The work provides new ways for the practical application of supercapacitors.