Porous FeP/FeO Deposited on Carbon Cloth with Accelerated Kinetics for the Hydrogen Evolution Reaction

Abstract

FeP/FeO was prepared on carbon cloth (CC) via hydrothermal method, heat treatment in air, and phosphorization in argon. FeP/FeO/CC presents a porous and loose morphology which is conducive to the exposure of active sites and the transfer of reactants. FeP/FeO/CC requires the low overpotentials of 257 and 117 mV (vs. reversible hydrogen electrode (RHE)) to achieve the current density of 10 mA·cm⁻² for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline KOH solution, respectively. The small Tafel slope values of 36.1 mV·dec⁻¹ (for OER) and 96.2 mV·dec⁻¹ (for HER) indicate that FeP/FeO/CC exhibits the fast electrocatalytic reactive kinetics for OER and HER. In particular, the reaction kinetics of FeP/FeO/CC accelerated with the progress of HER. The charge-transfer resistance (R _ct) of FeP/FeO/CC is only 11 Ω. Excellent bifunctional electrocatalytic performances of FeP/FeO/CC should be attributed to the porous morphology and the lower charge-transfer resistance.

Keywords

FeP/FeO/CC / OER / HER / water splitting

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