Strain-Induced Structure Evolution of Multimetallic Nanoplates

Azhar Mahmood; Dequan He; Shamraiz Hussain TalibYing HeZhongqian SongLiu ZhenbangDongxue HanLi Niu

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Strain-Induced Structure Evolution of Multimetallic Nanoplates

机译：Strain-Induced Structure Evolution of Multimetallic Nanoplates

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The surface structure and lattice strain necessary to optimize oxygen reductionreaction (ORR) in a cost-effective electrocatalyst still requires systematic exploration.Here, by means of oxidative etching of surface confinement stackingfaults, a comparative study of the influence of defects on the growth and latticestrain of PtAgPb core-shell nanoplates for ORR is conducted. Stacking faultsare key to forming the core–shell structure and induce tensile and compressivestrains to improve catalytic performance of nanoplates. In particular, the compressivestrain arising from the optimal composition of nanoplates enhancesthe ORR activity. The findings show how compressive strain in core–shellnanoplates shift the electronic band structure of platinum (Pt) and weakenschemisorption of oxygenated species. As a result, the obtained PtAgPb-IV/Cnanoplates display superior specific and mass activities (5.06 mA cm~(?2) and 2.24 A mgPt~(?1)) for ORR that are ≈18 and ≈13 times higher than that of commercialPt/C, placing it among the best reported Pt based ORR electrocatalysts.Furthermore, the PtAgPb-IV/C catalyst exhibits substantially improved durabilityrelative to commercial Pt/C catalysts. This work represents a major steptoward the deterministic synthesis of Pt-based multimetallic nanocrystals withspecific structure and surface strain for efficient ORR performance.

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来源
《Advanced functional materials》 |2022年第40期|2205223.1-2205223.10|共10页
作者
Azhar Mahmood; Dequan He; Shamraiz Hussain TalibYing HeZhongqian SongLiu ZhenbangDongxue HanLi Niu;
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作者单位

Guangzhou Key Laboratory of Sensing Materials & DevicesCenter for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006, P.R. China Key Laboratory of Organic Optoelectronics and Molecular EngineeringDe;

Guangzhou Key Laboratory of Sensing Materials & DevicesCenter for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006, P.R. China;

Key Laboratory of Organic Optoelectronics and Molecular EngineeringDepartment of ChemistryTsinghua UniversityBeijing 100084, China;

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正文语种英语
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catalysis; oxygen reduction reaction; platinum nanostructures; stacking faults; strain effect;

Strain-Induced Structure Evolution of Multimetallic Nanoplates

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