Dandelion-like P-Doped Fe-Co-Se Grown on Carbon Cloths for Enhanced Electrocatalytic Oxygen Evolution

Abstract

As a representative anodic reaction, the oxygen evolution reaction (OER) is often combined with hydrogen evolution, carbon dioxide reduction, and other cathodic reactions. Bimetallic selenides can satisfy the requirement of efficiency and economy for OER. However, the OER performance of Fe-Co-Se is less than satisfactory, restricted by the limited inherent active sites. Therefore, by doping P into Fe-Co-Se, the electron density and mass transfer were successfully adjusted. The 3D dandelion-like flower Fe-Co-Se-P/CC showed η₁₀ of 210 mV and the 45.3 mV dec⁻¹ Tafel slope better than Fe-Co-Se/CC and RuO₂. Experimental investigations demonstrated that outstanding OER activity was ascribed to the double modulation influences of P dopant both in electron environment and morphology which could not only improve conductivity but also enrich catalytic reactive sites. This work presents another choice for the design of a transition metal OER catalyzer and propels the development of electrocatalytic oxygen production to higher efficiency and lower cost.

Graphical Abstract

3D dandelion-like flowers Fe-Co-Se-P structure anchored on carbon cloth has been firstly synthesized as economy and efficient OER electrocatalyst, which displays outstanding catalytic perform ance (equipped with 210 mV low overpotential at η₁₀) and stability benefited from the double modulation effect of P doping on the electronic environment and morphology.