Abstract
We describe a facile chemical transformation method to produce small iron oxyhydroxide (FeOOH) nanoparticles for application in electrochemical oxygen evolution reaction (OER). In this work, iron alkoxide nanosheets were synthesized by heating a mixture of iron nitrate, ethylene glycol (EG), and oleylamine (OAm), which transformed to FeOOH nanoparticles with sizes less than 10nm upon alkali treatment in aqueous KOH solution. These FeOOH nanoparticles exhibited much enhanced OER activity compared with that of both commercial FeOOH powders and IrO2 catalyst, as well as good stability in high pH conditions.
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