LAUSR

Flexible transparent electrochemical supercapacitors are critical components for the rapid development of fully flexible transparent electronics, however, typical flexible transparent supercapacitor electrodes store limited energy due to the requirements of transparency. Self-standing core-shell structure metal oxide mesh electrode with metal oxide as active "shell" and metallic mesh as current collector "core" is effi-cient for simultaneously achieving high capacity, flexibility and transparency. In this work, we perform a morphology-controlled electrodeposition of MnO2 on the self-standing flexible transparent metallic Ni mesh electrode to achieve high-capacity flexible transparent supercapacitor electrode. Under optimized condi-tions, the MnO2 nanosheet composed flower-like multiscale microstructure was con-structed. The open, loose and porous MnO2 multiscale microstructure "shell" and high electrical conductivity of self-standing metallic mesh "core" synergistically enable efficient ionic and electronic transport and meanwhile retain high structural stability. The metal oxide mesh electrode yields an outstanding areal capacitance of 1.15 F/cm2 at an optical transmittance of 69.4% and excellent cycling stability. The symmetric solid-state supercapacitor device exhibits a high areal capacitance value (78.46 mF/cm2), superior cycling life as well as high optical transmittance and me-chanical flexibility, superior to most reported flexible transparent supercapacitors. This work provides a comprehensive understanding on how to achieve high-capacity flexible transparent supercapacitor electrodes and solid-state devices.