Bifunctional Shared Fibers for High‑Efficiency Self‑Powered Fiber‑Shaped Photocapacitors

Fiber-shaped photocapacitors(FPCs)based on shared bifunctional fiber electrodes for supercapacitors and solar cells hold great potential for the realization of self-powered systems for flexible wearable electronics.However,the reported electrodes for FPCs still face certain limitations,such as limited specific energy density,low total photochemical–electric energy conver-sion efficiency(ηtotal),and poor flexibility.Herein,hollow fibers consisting of partially reduced graphene oxide and a highly conductive polymer are assembled by wet-spinning and employed as shared bifunctional fibers to fabricate self-powered FPCs.Intriguingly,the FPCs achieve high flexibility and aηtotal of 4.2%.This study illustrates a feasible way to design high-performance FPCs and their applications in flexible electronics.