Journal
CHEMSUSCHEM
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202201808
Keywords
electrocatalysis; electrochemistry; high current density; nickel-iron oxide; oxygen evolution reaction
Funding
- Asahi Kasei Corporation, UTokyo-KAUST [4191]
- JSPS KAKENHI [19KK0126]
- Mohammed bin Salman Center for Future Science and Technology for Saudi-Japan Vision 2030 at The University of Tokyo (MbSC2030)
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Efficient oxygen evolution reaction (OER) with high current density reaching 1 A cm(-2) was achieved through interactive optimization of electrolyte and electrode at non-extreme pH levels. The OER performance was improved by introducing Cu or Au as the third element during electrode preparation, leading to enhanced electrochemical surface area.
High current density reaching 1 A cm(-2) for efficient oxygen evolution reaction (OER) was demonstrated by interactively optimizing electrolyte and electrode at non-extreme pH levels. Careful electrolyte assessment revealed that the state-of-the-art nickel-iron oxide electrocatalyst in alkaline solution maintained its high OER performance with a small Tafel slope in K-carbonate solution at pH 10.5 at 353 K. The OER performance was improved when Cu or Au was introduced into the FeOx-modified nanostructured Ni electrode as the third element during the preparation of electrode by electrodeposition. The resultant OER achieved 1 A cm(-2) at 1.53 V vs. reversible hydrogen electrode (RHE) stably for 90 h, comparable to those in extreme alkaline conditions. Constant Tafel slopes, apparent activation energy, and the same signatures from operando X-ray absorption spectroscopy among these samples suggested that this improvement seems solely correlated with enhanced electrochemical surface area caused by adding the third element.
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