Bacterial cellulose derived iron and phosphorus co-doped carbon nanofibers as an efficient oxygen reduction reaction electrocatalysts

Abstract

Heteroatom-doped carbon materials as efficient electrocatalysts for oxygen reduction reaction have been attracted a lot of research interest. For its low cost, high selectivity and excellent stability, heteroatoms-doped carbon materials have been considered as the candidate for replacing Pt-based catalysts. We had designed an iron and phosphorus co-doped carbon nanofibers (Fe-P/CNFs) derived from bacterial cellulose for oxygen reduction reaction, which not only showed a three-dimensional (3D) porous network structure, but also possessed large surface area. The unique 3D porous network could accelerate oxygen diffusion and electron transfer, and meanwhile enlarge specific surface area. Accordingly, the obtained material had more active sites for electrocatalysis. More importantly, the unusual synergistic effects between the doped Fe and P atoms could efficiently improve the electrocatalytic performance of oxygen reduction reaction. As expected, the Fe-P/CNFs showed a high ORR electrocatalytic activity with a more positive onset potential of 1.01V, similar with 1.03V at 20wt% Pt/C, and a good long-term stability (94% retention of current density after chronoamperometry 20,000s).