过电位
无机化学
电解
催化作用
离聚物
电解质
Nafion公司
析氧
化学
镍
氢氧化物
离子交换
化学工程
材料科学
电化学
电极
离子
冶金
工程类
物理化学
有机化学
聚合物
共聚物
作者
Alaa Y. Faid,Alejandro Oyarce Barnett,Frode Seland,Svein Sunde
标识
DOI:10.1016/j.ijhydene.2022.05.143
摘要
Tuning nickel-based catalyst activity and understanding electrolyte and ionomer interaction for oxygen evolution reaction (OER) is crucial to improve anion exchange membrane (AEM) water electrolyzers. Herein, an investigation of multimetallic Ni0.6Co0.2Fe0.2 OER activity, coupled with in-situ Raman spectroscopy to track dynamic structure changes, was carried out and compared to other Ni catalysts. The effect of KOH concentration, KOH purity, ionomer type, and electrolyte with organic cations was evaluated. The Ni0.6Co0.2Fe0.2 catalyst achieved 10 mA/cm2 at 260 mV overpotential with stability over 50 h and 5000 cycles in 1 M KOH. In-situ Raman spectroscopy showed that Ni0.6Co0.2Fe0.2 activity originates from promoting Ni(OH)2/NiOOH transformation at low potentials compared to bi- and mono-metallic nickel-based catalysts. Fumion anion ionomer in the catalyst inks led to a lower OER activity than catalysts with inks containing Nafion ionomer. The OER activity of Ni0.6Co0.2Fe0.2 is adversely influenced in the presence of fumion anion ionomer and benzyltrimethylammonium hydroxide (BTMAOH) with possible phenyl oxidation under applied high anodic potentials. The alkaline AEM water electrolyzer circulating 1 M KOH electrolyte, with a Pt/C cathode and a Ni0.6Co0.2Fe0.2 anode, achieved 1.5 A/cm2 at 2 V.
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