Graphene fiber enhanced FeCoCN catalyst electrodes for hydrogen peroxide fuel cells

Abstract

Flexible hydrogen peroxide (H₂O₂) fiber fuel cells hold great promise for wearable and autonomous energy systems but are often limited by poor catalytic efficiency and mechanical fragility. Here, we present a graphene fiber (GF)-reinforced FeCoCN hybrid catalyst that combines active site dispersion with a robust 1D conductive framework. Covalent anchoring of FeCoCN onto oxygen-functionalized GF enables uniform active site distribution and efficient electron transport. The catalytic interface promotes O–O bond cleavage, enhancing H₂O₂ selectivity and performance, achieving a high-power density of 9.32 mW cm⁻². The fibrous structure offers excellent mechanical durability, maintaining stable output after 1000 bending cycles. This work provides a scalable strategy for high-performance, flexible H₂O₂ fuel cells.