Highly Active and Durable FeNiCo Oxyhydroxide Oxygen Evolution Reaction Electrocatalysts Derived from Fluoride Precursors
Highly Active and Durable FeNiCo Oxyhydroxide Oxygen Evolution Reaction Electrocatalysts Derived from Fluoride Precursors
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DOI：
10.1021/acssuschemeng.1c03116
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发表时间：
2021-07
影响因子：
8.4
通讯作者：
M. Nishimoto;Sho Kitano;D. Kowalski;Y. Aoki;H. Habazaki
中科院分区：
文献类型：
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作者：
M. Nishimoto;Sho Kitano;D. Kowalski;Y. Aoki;H. Habazaki
开发高活性、高耐久性的稀土元素析氧电催化剂是实现大规模水裂解制氢的关键。在此，我们报告说，市售的FeNiCo合金可以转化为一个高活性的电催化剂OER恒电流阳极氧化含氟的乙二醇电解质。阳极氧化的合金开发的多孔膜组成的（FeNiCo）F2相，这是很容易转化为高活性的多孔羟基氧化物在阳极极化过程中在KOH电解液。阳极氧化的合金表现出高活性和高耐久性的OER与低至0.26 V的过电位在10 mA cm-2的电流密度。本研究表明，一个简单的和具有成本效益的阳极氧化工艺可以用来形成一个高活性的OER电极从低成本，实用，铁基合金。此外，我们发现，含铁，镍，钴的氟化物是形成羟基氧化物表现出高OER活性和耐久性的优良前体。
Developing highly active and durable electrocatalysts, consisting of earth-abundant elements, for oxygen evolution reaction (OER) is pivotal for large-scale water splitting for hydrogen production. Herein, we report that the commercially available FeNiCo alloy can be converted to a highly active electrocatalyst for OER by galvanostatic anodizing in a fluoride-containing ethylene glycol electrolyte. Anodizing of the alloy develops a porous film consisting of the (FeNiCo)F2phase, which is readily converted to a highly active porous oxyhydroxide during anodic polarization in a KOH electrolyte. The anodized alloy exhibits high activity and high durability for OER with an overpotential as low as 0.26 V at a current density of 10 mA cm–2. The present study demonstrates that a simple and cost-effective anodizing process can be used to form a highly active OER electrode from a low-cost, practical, iron-based alloy. In addition, we found that fluorides containing Fe, Ni, and Co are excellent precursors for the formation of oxyhydroxides exhibiting high OER activity and durability.