An efficient polymer moist-electric generator is developed on the basis of conventional polyelectrolyte membrane to output considerable electric power under moisture.
Converting ubiquitous environmental energy into electric power holds tremendous social and financial interests. Traditional energy harvesters and converters are limited by the specific materials and complex configuration of devices. Herein, it is presented that electric power can be directly produced from pristine graphene oxide (GO) without any pretreatment or additives once encountering the water vapor, which will generate an open-circuit-voltage of up to 0.4-0.7 V and a short-circuit-current-density of 2-25 µA cm on a single piece of GO film. This phenomenon results from the directional movement of charged hydrogen ions through the GO film. The present work demonstrates and provides an extremely simple method for electric energy generation, which offers more applications of graphene-based materials in green energy converting field.
We have developed a facile and straightforward approach for the continuous fabrication of graphene/ polypyrrole (G/PPy) composite fibers via a wet-spinning strategy. The diameter of G/PPy fibers can be well-controlled in the range of about 15-80 mm. Furthermore, the fiber possesses high conductivity and mechanical flexibility, thus offering significant advantages as flexible, lightweight electrodes for an efficient fiber-based electrochemical supercapacitor. The all-solid-state fiber supercapacitor with H 2 SO 4 -polyvinyl alcohol (H 2 SO 4 -PVA) gel electrolyte has been demonstrated, which could be woven into a textile for wearable electronics.
A direct wet spinning approach is demonstrated for facile and continuous fabrication of a whole fiber supercapacitor using a microfluidic spinneret. The resulting fiber supercapacitor shows good electrochemical properties and possesses high flexibility and mechanical stability. This strategy paves the way for large-scale continuous production of fiber supercapacitors for weavable electronics.
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