Structure evolution of PtCu nanoframes from disordered to ordered for the oxygen reduction reaction

被引：117

作者：

Gong, Mingxing ^{[1
]}

Xiao, Dongdong ^{[2
]}

Deng, Zhiping ^{[1
]}

Zhang, Rui ^{[3
]}

Xia, Weiwei ^{[4
]}

Zhao, Tonghui ^{[1
]}

Liu, Xupo ^{[1
]}

Shen, Tao ^{[1
]}

Hu, Yezhou ^{[1
]}

Lu, Yun ^{[1
]}

Zhao, Xu ^{[1
]}

Xin, Huolin ^{[3
]}

Wang, Deli ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Key Lab Mat Chem Energy Convers & Storage, Minist Educ, Hubei Key Lab Mat Chem & Serv Failure,Sch Chem &, Wuhan 430074, Peoples R China

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[4] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 282卷

关键词：

Oxygen reduction reaction; Ordered intermetallics; PtCu nanoframe; 3D tomography; Atom migration; ONE-POT SYNTHESIS; INTERMETALLIC NANOPARTICLES; HYDROGEN EVOLUTION; ELECTROCATALYSTS; NANOCRYSTALS; NANOWIRES; CATALYSIS; NANOCUBES; CU;

D O I：

10.1016/j.apcatb.2020.119617

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Crystal structure engineering of platinum (Pt) based disordered alloys to chemically ordered intermetallics has triggered increasing attention in promoting their performance towards the oxygen reduction reaction (ORR). However, a systematic experiment of comparing the catalytic performance in different crystal structures is rarely reported. Herein, the widely-watched PtCu nanoframes (atomically disordered) are firstly synthesised to in-vestigate their structure-properties relationship. Subsequently, rhombohedral PtCu intermetallics (L11 structured, atomically ordered) which were rarely reported before are fabricated by appropriate high temperature treatment. The L11-PtCu delivers significantly enhanced durability (only 15 % attenuation after 30,000 cycles) while decreased initial activity (0.44 A mgPt-1) for ORR compared with their disordered counterpart. In virtue of in-situ STEM experiment assisted by the state-of-the-art 3D tomography, we reveal that the ordering process improves the resistance against Cu leaching meanwhile results in the collapse and aggregation of the NFs. This work provides a visual understanding of Pt based electrocatalyst in different crystal structures for proton exchange membrane fuel cells in the future.

引用

页数：8

共 52 条

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