Turing-type high-entropy oxide nanosheets for efficient seawater electrolysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 42525779.
- Also identified by DOI 10.1126/sciadv.aeb2204.
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Abstract
Owing to the merit of twin boundaries, Turing-type nanostructures have received increasing attention in electrocatalysis. Integrating high-entropy design holds great promise for further improved activities due to compositional flexibility and high-entropy effects. Here, Turing-type high-entropy oxide nanosheets of spinel (Co<sub>0.19</sub>Mn<sub>0.21</sub>Cu<sub>0.20</sub>Ni<sub>0.20</sub>Zn<sub>0.20</sub>)<sub>3</sub>O<sub>4</sub> are designed for seawater electrolysis. The high density of twin boundaries causes severe distortion and compressive strain. The compressive strain weakened metal-ligand interaction and induced a spin transition of active cobalt(III) ion from low-spin (LS) to high-spin (HS) configuration, which favors hydroxide ion adsorption, deprotonation, and strong repulsion toward chloride ions during seawater oxidation. Consequently, the optimized Turing HEO-300 achieves an overpotential of 340 millivolts at 100 milliampere per square centimeter for over 350 hours, outperforming the Turing-type low-entropy oxides, non-Turing high-entropy oxides, and most of reported oxide-based catalysts. Moreover, a seawater electrolyzer with Turing HEO-300 anode maintains 1 ampere per square centimeter at 1.80 volts for over 100 hours. This work paves the way for designing Turing-type high-entropy catalysts.