Small palladium islands embedded in palladium-tungsten bimetallic nanoparticles form catalytic hotspots for oxygen reduction

被引：80

作者：

Hu, Guangzhi ^{[1
]}

Nitze, Florian ^{[2
]}

Gracia-Espino, Eduardo ^{[1
,3
]}

Ma, Jingyuan ^{[4
]}

Barzegar, Hamid Reza ^{[1
]}

Sharifi, Tiva ^{[1
]}

Jia, Xueen ^{[1
]}

Shchukarev, Andrey ^{[3
]}

Lu, Lu ^{[5
,6
]}

Ma, Chuansheng ^{[5
,6
]}

Yang, Guang ^{[5
,6
]}

Wagberg, Thomas ^{[1
]}

机构：

[1] Umea Univ, Dept Phys, S-90187 Umea, Sweden

[2] Chalmers Univ Technol, Dept Chem & Biol Engn, Div Appl Surface Chem, S-41296 Gothenburg, Sweden

[3] Umea Univ, Dept Chem, S-90187 Umea, Sweden

[4] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

[5] Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab Minist Educ, Xian 710049, Peoples R China

[6] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

中国国家自然科学基金; 瑞典研究理事会;

关键词：

HELICAL CARBON NANOFIBERS; ELECTROCATALYTIC ACTIVITY; FUEL-CELLS; EXAFS; ACID; ELECTROOXIDATION; NANOCRYSTALS; STABILITY; METHANOL; DENSITY;

D O I：

10.1038/ncomms6253

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The sluggish kinetics of the oxygen reduction reaction at the cathode side of proton exchange membrane fuel cells is one major technical challenge for realizing sustainable solutions for the transportation sector. Finding efficient yet cheap electrocatalysts to speed up this reaction therefore motivates researchers all over the world. Here we demonstrate an efficient synthesis of palladium-tungsten bimetallic nanoparticles supported on ordered mesoporous carbon. Despite a very low percentage of noble metal (palladium: tungsten = 1:8), the hybrid catalyst material exhibits a performance equal to commercial 60% platinum/Vulcan for the oxygen reduction process. The high catalytic efficiency is explained by the formation of small palladium islands embedded at the surface of the palladium-tungsten bimetallic nanoparticles, generating catalytic hotspots. The palladium islands are similar to 1 nm in diameter, and contain 10-20 palladium atoms that are segregated at the surface. Our results may provide insight into the formation, stabilization and performance of bimetallic nanoparticles for catalytic reactions.

引用

页数：9

共 51 条

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