Synergistic effect of surface reconstruction and rGO for FeS2/rGO electrocatalysis with efficient oxygen evolution reaction for water splitting
Xiaozhen Ren, Shanshan Li, Junchang Liu, Yanan Zhou, Jie Yin, Hua Yang
Abstract
Exploring highly active and inexpensive electrocatalysts for oxygen evolution is vital but challenging. Herein, a serial of FeS2, FeS and FeS2/rGO electrocatalysts were obtained by simple two-step method. Benefiting from the integration of FeS2 and rGO, the FeS2-450/rGO-10% exhibited the excellent catalytic activity toward OER with an ultra-low overpotential of 140 mV, a smaller Tafel slope of 71 mV/dec and high stability. The improved catalytic performance for OER could attribute to the excellent synergistic effect of the surface reconstruction of FeS2 and the introduction of rGO in FeS2-450/rGO-10% catalyst. Meanwhile, in a two-electrode system of FeS2-450/rGO-10%/NF//Pt/C/NF toward overall water splitting, the voltage at 10 mA cm−2 is only 1.52 mV, which indicates that the FeS2-450/rGO-10% can serve as the anode in practical overall water splitting.