Controlling Pt Crystal Defects on the Surface of Ni-Pt Core-Shell Nanoparticles for Active and Stable Electrocatalysts for Oxygen Reduction

被引：19

作者：

Alinezhad, Ali ^{[2
,3
]}

Benedetti, Tania M. ^{[2
,3
]}

Gloag, Lucy ^{[2
,3
]}

Cheong, Soshan ^{[4
]}

Watt, John ^{[5
]}

Chen, Hsiang-Sheng ^{[2
,3
]}

Gooding, J. Justin ^{[6
]}

Tilley, Richard D. ^{[1
,2
]}

机构：

[1] Univ New South Wales, Sch Chem, Electron Microscope Unit, Mark Wainwright Analyt Ctr, Sydney, NSW 2052, Australia

[2] Univ New South Wales, ARC Ctr Excellence Convergent Bionano Sci & Techn, Sydney, NSW 2052, Australia

[3] Univ New South Wales, Sch Chem, Sydney, NSW 2052, Australia

[4] Univ New South Wales, Mark Wainwright Analyt Ctr, Electron Microscope Unit, Sydney, NSW 2052, Australia

[5] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[6] Univ New South Wales, Sch Chem, Australian Ctr Nanomed, Sydney, NSW 2052, Australia

来源：

ACS APPLIED NANO MATERIALS | 2020年 / 3卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

Pt-Ni; defects; step-edge; grain boundaries; ORR; STABILITY; NANOWIRES; CATALYSTS;

D O I：

10.1021/acsanm.0c01159

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A strategy of direct growth of Pt on Ni was used to create and control Pt crystal defects on the surface of Ni-Pt core-shell nanoparticles. The control over the types of defects was easily achieved by changing the surfactant system. In this work, two types of crystal defects have been introduced into Ni-Pt core-shell nanoparticles: polycrystalline shells with multiple grain boundaries and step-edge shells with undercoordinated atoms at corners and steps. We show that the step-edge shell has a higher specific activity for the oxygen reduction reaction (ORR), while the thinner polycrystalline shell results in a higher activity per mass and stability. Our results suggest that Ni-Pt core-shell nanoparticles with a thin Pt shell that have high density of crystal defect should be targeted for high performance ORR catalysts.

引用

页码：5995 / 6000

页数：6

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