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• W3186102942 endingPage "2102448" @default.
• W3186102942 startingPage "2102448" @default.
• W3186102942 abstract "The NiO-based electrocatalytic oxygen evolution reaction (OER) of water splitting is recognized as a promising approach to produce clean H2 fuel. However, the OER performance is still low, and especially, the overpotential is larger than 200 mV at the current density of 10 mA cm−2. Herein, an Ir@IrNiO sample is prepared with single-atom (SA) Ir4+ doping and surface metallic Ir nanoparticles loaded onto the NiO. Owing to the bonding of the loaded Ir with surface-exposed Ni2+, the nearby Ni atoms exist in the +3 valence state, that is, the surface-loaded Ir particles behave like a stabilizer for the Ni3+ sites. Under the synergistic effect of SA Ir4+ and high-valance-state Ni3+, the Ir@IrNiO nanostructure effectively reduces the overpotential to 195 mV at a current density of 10 mA cm−2. Moreover, it gives an Ir-content-normalized current density of 0.0457 A mgIr−1, 72.1 times higher than that of the best commercialized IrO2 (6.33 × 10−4 A mgIr−1), under the condition of 1.5 V versus reversible hydrogen electrode. Operando Raman and X-ray absorption fine-structure (XAFS) measurements reveal that there are more surface-active species of Ni3+, which adsorb and activate water molecules to form Ni3+–*OH at low voltage, the intermediate of Ni4+–•O is then formed at a relatively high bias voltage, and then the •O is transferred to the SA Ir4+ sites to generate Ir4+–O–O with OH at increased voltage. This work can help design more SA-based highly active OER materials." @default.
• W3186102942 created "2021-08-02" @default.
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• W3186102942 date "2021-07-29" @default.
• W3186102942 modified "2023-09-26" @default.
• W3186102942 title "Single‐Atom Doping and High‐Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation" @default.
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• W3186102942 doi "https://doi.org/10.1002/smll.202102448" @default.
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