Hollow heterogeneous CuSe@MnSe for high-performance printed flexible supercapacitor

High-performance electrode materials are of great significance to realize the practical application of energy storage devices. One proficient approach to achieving high-performance electrode materials is through the design of nanostructure and heterostructure. Herein, a high-performance printed hybrid supercapacitor is fabricated by using a nanostructured CuSe@MnSe composite. The α-MnSe nanoparticles are successfully loaded onto the hollow cubic CuSe through ingenious design, which not only maintained high conductivity but also reduced the issue of volume expansion during the energy storage process. The CuSe@MnSe composite possesses a high capacity (635.32 C g−1) and over 7000 cycles of stability (91.62% capacity retention). The as-printed flexible hybrid supercapacitor exhibits a high capacitance of 164.9 mF cm−2 while exhibiting outstanding energy density (58 μWh cm−2) (19.54 Wh kg−1) and power density (0.8 mW cm−2) (266 W kg−1) when operating at high voltage of 1.6 V. It can fulfill the bending resistance requirements of wearable electrical devices (93% capacitance retention after repeated bending 1000 times). Effective electrode design shows great development potential for printed energy storage devices in wearable electronics, which offers a good way for material inspiration and synthesis.