Authors: Minsol Kwon, Jun Seok Ha, Dong Ho Lee, Taehyun Kwon, Minseo Kim, Young‐Hun Jeong, Han Seul Kim, Alex Ditter, David A. Shapiro, Young‐Sang Yu, Yoo Sei Park, Dongju Lee
Published: 2025-01-08
Source: Full article
AbstractDeveloping efficient, economical, and stable catalysts for the oxygen evolution reaction is pivotal for producing large‐scale green hydrogen in the future. Herein, a vanadium‐doped nickel‐iron oxide supported on nickel foam (V‐NiFe2O4/NF) is introduced, and synthesized via a facile hydrothermal method as a highly efficient electrocatalyst for water electrolysis. X‐ray photoelectron and absorption spectroscopies reveal a synergistic interaction between the vanadium dopant and nickel/iron in the host material, which tunes the electronic structure of NiFe2O4 to increase the number of electrochemically active sites. The V‐NiFe2O4/NF electrode exhibited superior electrochemical performance, with a low overpotential of 186 mV at a current density of 10 mA cm−2, a Tafel slope value of 54.45 mV dec−1, and minimal charge transfer resistance. Employing the V‐NiFe2O4/NF electrode as an anode in an alkaline anion exchange membrane water electrolyzer single‐cell, a cell voltage of 1.711 V is required to achieve a high current density of 1.0 A cm−2. Remarkably, the cell delivered an energy conversion efficiency of 73.30% with enduring stability, making it a promising candidate for industrial applications.