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Sub-2 nm IrO_(2)/Ir nanoclusters with compressive strain and metal vacancies boost water oxidation in acid

Nano Research 2023年第1期16卷 334-342页

作者： Zhijuan Liu Guangjin Wang Jinyu Guo Shuangyin Wang Shuang-Quan Zang Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China Hunan University State Key Laboratory of Chem/Bio-sensing and ChemometricsCollege of Chemistry and Chemical EngineeringChangsha 410082China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

IrO_(2)exhibits good stability but limited electrocatalytic activity for oxygen evolution reaction in *** engineering is an effective strategy to improve the intrinsic ability of electrocatalysts by tailoring their electronic ***,we have successfully synthesized IrO_(2)/Ir heterophase with compressive strain and metal vacancies via a simple substitution-etching *** virtue of the solubility of Cr in strong alkali,metal vacancies could be formed at surface after etching Cr-doped IrO_(2)/Ir in alkali,which leaded to modulated electronic ***,the substitution of Cr with smaller atom radius would induce the formation of compressive strain and the relocated atoms made the d-band center *** the regulated electronic structure and tuned d-band center,the obtained electrocatalyst only needed 285 mV to reach 10 mA·cm^(−2)in 0.1 M *** kinetic has been rapidly accelerated as indicated by the smaller Tafel slope and charge transfer *** calculations revealed that the d-band center and charge density distribution have been regulated with the introduction of defects in IrO_(2)/Ir,which significantly decreased the free energy barrier of rate determining *** work provides a valuable reference to design effective and defects-rich electrocatalysts.

关键词： IrO_(2)/Ir nanoclusters compressive strain metal vacancies d-band center water oxidation in acid

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