A Wet Impregnation Strategy for Advanced FeNi‐Based Electrocatalysts towards Oxygen Evolution

Abstract

In this study, the typical wet impregnation method was employed to prepare advanced electrocatalysts for oxygen evolution reaction (OER). The preparation process is easy‐operation and doesn't require any complex synthesis steps. This strategy was demonstrated with Fe3+/Ni2+ loaded on porous carbon as an example. The thus formed pre‐catalyst was in situ activated in the electrochemical test process, during which the electrochemically active species for OER are achieved. With the optimized catalyst, a current density of 10 mA.cm−2 can be obtained at an overpotential of 275 mV. This catalytic performance is close to or even better than the benchmarked RuO2 and IrO2 catalysts. Especially, the catalyst also exhibits good catalytic stability. This study presents a new non‐chemical synthesis route for advanced oxygen evolution catalysts.

Morphology-Dependent Electrocatalytic Performance of a Two-Dimensional Nickel–Iron MOF for Oxygen Evolution Reaction

“…For the measurement of i−t curve, the sample was loaded on a 0.5 × 0.5 cm 2 nickel foam with a loading mass of 0.2 mg cm −2 as the working electrode. 33,34 The calculations of turnover frequency (TOF) and electrochemical surface area (ECSA) are detailed in the Supporting Information.…”

“…Potentials refer to the reversible hydrogen electrode (RHE) through the following calculation: E RHE = E Ag/AgCl + E Ag/AgCl (reference) + 0.059 pH. The value of E Ag/AgCl (reference) is 0.197 V. For the measurement of i–t curve, the sample was loaded on a 0.5 × 0.5 cm 2 nickel foam with a loading mass of 0.2 mg cm –2 as the working electrode. , The calculations of turnover frequency (TOF) and electrochemical surface area (ECSA) are detailed in the Supporting Information.…”