Engineering Microdomains of Oxides in High-Entropy Alloy Electrodes toward Efficient Oxygen Evolution.
basic_science · Level V
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- Record sourced from PubMed, PMID 34250646.
- Also identified by DOI 10.1002/adma.202101845.
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Abstract
One important goal of the current electrocatalysis is to develop integrated electrodes from the atomic level design to multilevel structural engineering in simple ways and low prices. Here, a series of oxygen micro-alloyed high-entropy alloys (O-HEAs) is developed via a metallurgy approach. A (CrFeCoNi)<sub>97</sub> O<sub>3</sub> bulk O-HEA shows exceptional electrocatalytic performance for the oxygen evolution reaction (OER), reaching an overpotential as low as 196 mV and a Tafel slope of 29 mV dec<sup>-1</sup> , and with stability longer than 120 h in 1 m KOH solution at a current density of 10 mA cm<sup>-2</sup> . It is shown that the enhanced OER performance can be attributed to the formation of island-like Cr<sub>2</sub> O<sub>3</sub> microdomains, the leaching of Cr<sup>3+</sup> ions, and structural amorphization at the interfaces of the domains. These findings offer a technological-orientated strategy to integrated electrodes.