In situ oxidation coating of copper bismuth oxide with polypyrrole to construct rice-like core-shell structures: Revealing prospects for high-performance asymmetric supercapacitor anodes
Min Lü, Xinyu Li, Xiaohui Xu, Xinyan Wang, Wenxiao Zhang, Leyao Shi
Abstract
Enhancing the energy density of asymmetric supercapacitors (ASCs) requires developing high-performance anode materials that pair well with cathode materials. In this study, rice-like structured CuBi 2 O 4 was synthesized using a simple and cost-effective wet-chemical method. Subsequently, the conductive polymer polypyrrole (PPy) was polymerized on the surface of CuBi 2 O 4 . This process yielded a novel core–shell structured anode material (CuBi 2 O 4 @PPy). Due to its unique composition and structure, CuBi 2 O 4 @PPy exhibits remarkable electrochemical properties. For example, it delivers a specific capacitance of 1336 F·g −1 at 1 A·g −1 . When paired with Ni 1.5 Co 1.5 S 4 (NCS) as the cathode material, the NCS//CuBi 2 O 4 @PPy ASC demonstrates a specific capacitance of 219.2 F·g −1 at 1 A·g −1 . The device achieves an energy density of 68.5 Wh·kg −1 at a power density of 750 W·kg −1 . Additionally, the NCS//CuBi 2 O 4 @PPy ASC can power commercial LED bulbs for over 25 min. Overall, as an anode material, the core–shell structured CuBi 2 O 4 @PPy holds great promise for the development of high-performance electrochemical energy storage devices.