首页|Shape and composition evolution of Pt and Pt3M nanocrystals under HCl chemical etching
Shape and composition evolution of Pt and Pt3M nanocrystals under HCl chemical etching
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Controlling the shape and composition of Pt-based nanocrystals is essential to improve electrocatalytic performance.In this work,we have carefully investigated the evolution process of morphology and com-position for Pt and Pt3M(M=Ni,Co)nanocrystals by hydrochloric acid(HCl)etching.As a result,only Pt3Ni nanocrystals successfully formed unsaturated step-like atoms on the surface and then constructed high-index facets(HIFs),while Pt and Pt3Co preserved a good octahedron shape.Density functional the-ory(DFT)calculation suggests that Cl-ions can be tightly adsorbed on the surface of Pt3Ni rather than other nanocrystals,which hinders the deposition of newly-reduced atoms and thus regulating the surface morphology.Besides,the etching of surface transitional metals further accelerates the formation of HIFs.Boosted by the active sites on the surface,HCl-Pt-Ni exhibited a～10.8 and～11.3 times higher oxygen re-duction reaction(ORR)mass and specific activities than commercial Pt/C catalyst,and possessed a good durability after 10,000 cycles test.This work gives a deep insight into the design of high-performance Pt-based ORR catalysts.
Lian Sun、Honglei Wang、Ming Ma、Tingting Cao、Leilei Zhang、Xingui Zhou
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State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China
School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China
State Key Laboratory of Crystal Materials and Institute of Crystal Materials,Shandong University,Ji'nan 250100,China
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