Fabrication of flexible, foldable Ag/Bi 2 S 3 nanoflowers-based asymmetric micro-capacitor

[摘要] Flexible and foldable microcomponents are highly desirable for energy devices. In this work, flexible asymmetric micro-capacitor (AMC) is fabricated by using uniform Ag/Bi 2 S 3 (or Bi 2 S 3 ) nanoflowers, active carbon and carbon fibres are used as positive material, negative material and current collector, respectively. On one hand, the areal capacitance of Ag/Bi 2 S 3 electrode has increased by more than 6 times than Bi 2 S 3 , and 86 and 68% of capacitances are retained for Ag/Bi 2 S 3 and Bi 2 S 3 electrodes after 4000 cycles, respectively. On the other hand, Ag/Bi 2 S 3 -based AMC has an energy density of (0.0134 mWhcm −3 ) 4.36 times higher than Bi 2 S 3 -based one (0.0025 mWhcm −3 ); after 4000 cycles, 84 and 33% of capacitances are retained for Ag/Bi 2 S 3 - and Bi 2 S 3 -based AMCs, respectively. The improved performances are mainly attributed to the enhanced electrical conductance by Ag loading (Bi 2 S 3 : 21.898 Ω; Ag/Bi 2 S 3 : 4.5643 Ω). Most importantly, the AMC is flexible and foldable, which is promising to conveniently apply in complicated energy devices, production for practical applications.

[学科分类] 计算机科学（综合）

[关键词] bismuth compounds;supercapacitors;nanofabrication;electrochemical electrodes;silver;electrical conductivity;capacitance;carbon fibres;nanostructured materials;electrodes;foldable nanoflower-based asymmetric microcapacitor;flexible nanoflower-based asymmetric microcapacitor;foldable microcomponents;flexible microcomponents;energy devices;active carbon;carbon fibres;positive material;negative material;areal capacitance;current collector;Bi2S3-based AMCs;energy density;electrical conductance;Ag loading;Ag-Bi2S3-C-C