A novel CuCo2S4/polyacrylonitrile ink for flexible film supercapacitors

Abstract This is the first investigation of the CuCo 2 S 4 /polyacrylonitrile ink for flexible film supercapacitors, which contains CuCo 2 S 4 nanosheets and modified polyacrylonitrile molecular chain. Significantly, this novel ink revealed an excellent film forming property and superior heat stability. As a product, the CuCo 2 S 4 /polyacrylonitrile film electrode exhibited a high specific capacitance (385 F g −1 at 1 A g −1 ) and great cycling stability (92.1% retention at 10 A g −1 for 2000 cycles) for practical energy storage applications.