Kwon Minsol, Ha Jun Seok, Lee Dong Ho, Kwon Taehyun, Kim Minseo, Jeong Young-Hun, Kim Han Seul, Ditter Alex, Shapiro David A, Yu Young-Sang, Park Yoo Sei, Lee Dongju
Department of Urban, Energy, and Environmental Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea.
Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea.
Small. 2025 Feb;21(7):e2410006. doi: 10.1002/smll.202410006. Epub 2025 Jan 7.
Developing 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-NiFeO/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 NiFeO to increase the number of electrochemically active sites. The V-NiFeO/NF electrode exhibited superior electrochemical performance, with a low overpotential of 186 mV at a current density of 10 mA cm, a Tafel slope value of 54.45 mV dec, and minimal charge transfer resistance. Employing the V-NiFeO/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. Remarkably, the cell delivered an energy conversion efficiency of 73.30% with enduring stability, making it a promising candidate for industrial applications.
开发用于析氧反应的高效、经济且稳定的催化剂对于未来大规模生产绿色氢能至关重要。在此，引入了负载在泡沫镍上的钒掺杂镍铁氧化物（V-NiFeO/NF），并通过简便的水热法合成作为用于水电解的高效电催化剂。X射线光电子能谱和吸收光谱揭示了钒掺杂剂与主体材料中的镍/铁之间的协同相互作用，这调节了NiFeO的电子结构以增加电化学活性位点的数量。V-NiFeO/NF电极表现出优异的电化学性能，在电流密度为10 mA cm时过电位低至186 mV，塔菲尔斜率值为54.45 mV dec，且电荷转移电阻最小。在碱性阴离子交换膜水电解槽单电池中使用V-NiFeO/NF电极作为阳极，要实现1.0 A cm的高电流密度需要1.711 V的电池电压。值得注意的是，该电池具有73.30%的能量转换效率且具有持久稳定性，使其成为工业应用的有前景的候选者。
