Sustainable and robust polypyrrole/carbon nitride/regenerated cellulose fiber with visible-light-enhanced capacitance...

With the rise of wearable devices, it is important but challenge to develop flexible energy storage materials that combine excellent mechanical properties, good electrochemical properties, and other functions. Here, a polypyrrole (PPy)/carbon nitride (C₃N₄)/regenerated cellulose composite fiber (PCCF) was firstly fabricated through a straightforward in situ polymerization and wet spinning process. The results show that PCCF can well balance mechanical properties, visible light antibacterial property and energy storage when compared to PPy/regenerated cellulose composite fiber (PCF). The tensile strength of PCCF was 152.5 MPa which was 2.5 times of PCF. The inhibition zone of PCCF under visible light conditions is significantly increased by approximately 98.65 % compared to dark condition, which cannot be observed in PCF. Besides, the specific capacitance of PCCF (103.75 mF cm^-1) is 6.15 times superior to that of PCF (16.88 mF cm^-1) under visible light conditions. PCCF also demonstrates visible-light enhanced energy storage performance with a specific capacitance enhancement of about 44.35 % and double of the discharge time (1 mA cm^-1) from dark condition to visible light condition. However, PCF does not have visible light-enhanced energy storage properties. This study introduces a novel concept for the advancement of flexible and multifunctional light-enhanced energy storage devices.