A high-performance quasi-solid-state supercapacitor diode for flexible logic gate

A supercapacitor diode (CAPode), which combines both functions of energy storage and the current rectification, shows strong potential for a wide range of applications. However, it remains a big challenge to achieve flexible CAPodes with high performance because of limitations in electrode and electrolyte materials. In this study, we construct a high-performance flexible CAPode by synergistical optimization of electrodes and polymer electrolyte. The ion–sieving effects of oxygen–deficient intercalated transition metal oxide (MoOx) are revealed by experimental results and theoretical calculation. The resultant quasi-solid-state CAPode not only shows high specific capacitance and rectification ratio, but also exhibits excellent mechanical flexibility. The CAPodes-based “AND” and “OR” logic gates with good processing ability are also built and investigated.