Nano-size IrOx catalyst of high activity and stability in PEM water electrolyzer with ultra-low iridium loading

[Display omitted] •Nano-size IrOx/Nafion® catalyst is synthesized with a cost-effective process.•The IrOx/Nafion® catalyst shows excellent stability of 4,500 h in MEA test.•The iridium loading is reduced to 1/30th the commercial MEA loading.•Key factors are identified for achieving high OER activity...

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