Boosting the activity and stability of self-supporting FeCoNiMoPB amorphous alloy for oxygen evolution

Abstract

Amorphous ribbons, as one class free-standing OER electrocatalyst, have been attracted attention. It is crucial that achieving the efficient and durable amorphous ribbon for oxygen evolution reaction (OER) by exploring suitable methods. Herein, it is reported that the self-supporting Fe25Co25Ni25Mo9P8B8 amorphous ribbon is treated via dealloying or annealing method. The optimal dealloyed ribbon exhibits a low overpotential of 281 mV at 10 mA cm−2, the small Tafel slope of 36.49 mV dec−1 and excellent stability, which are obviously superior to those of the raw ribbon and the annealed ribbon. The fast self-reconstruction of active layer in amorphous structure and the protection effect of Mo/P oxide layer induced by dealloying significantly boost the OER activity and stability of the amorphous ribbon. This work provides a different angle on the exploring of reasonable method to optimize the amorphous ribbon electrocatalysts and facilitates the practical applications of ribbon electrocatalysts.