Platinum-Ruthenium Bimetallic Nanoparticle Catalysts Synthesized Via Direct Joule Heating for Methanol Fuel Cells

被引:3
作者
Deng, Yeyu [1 ]
Liu, Heng [2 ]
Lai, Leo [1 ]
She, Fangxin [1 ]
Liu, Fangzhou [1 ]
Li, Mohan [1 ]
Yu, Zixun [1 ]
Li, Jing [1 ]
Zhu, Di [1 ]
Li, Hao [2 ]
Wei, Li [1 ]
Chen, Yuan [1 ]
机构
[1] Univ Sydney, Sch Chem & Biomol Engn, Darlington, NSW 2006, Australia
[2] Tohoku Univ, Adv Inst Mat Res WPI AIMR, Sendai 9808577, Japan
基金
日本学术振兴会; 澳大利亚研究理事会;
关键词
Joule heating; methanol fuel cell; methanol oxidation reaction; platinum ruthenium alloy nanoparticle; ONE-POT SYNTHESIS; CARBON NANOTUBES; PT-CO; OXIDATION; ALLOY; ELECTROCATALYST; NANOCRYSTALS; TEMPERATURE; PERFORMANCE; SUPPORT;
D O I
10.1002/smll.202403967
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Platinum-Ruthenium (PtRu) bimetallic nanoparticles are promising catalysts for methanol oxidation reaction (MOR) required by direct methanol fuel cells. However, existing catalyst synthesis methods have difficulty controlling their composition and structures. Here, a direct Joule heating method to yield highly active and stable PtRu catalysts for MOR is shown. The optimized Joule heating condition at 1000 degrees C over 50 microseconds produces uniform PtRu nanoparticles (6.32 wt.% Pt and 2.97 wt% Ru) with an average size of 2.0 +/- 0.5 nanometers supported on carbon black substrates. They have a large electrochemically active surface area (ECSA) of 239 m2 g-1 and a high ECSA normalized specific activity of 0.295 mA cm-2. They demonstrate a peak mass activity of 705.9 mA mgPt-1 for MOR, 2.8 times that of commercial 20 wt.% platinum/carbon catalysts, and much superior to PtRu catalysts obtained by standard hydrothermal synthesis. Theoretical calculation results indicate that the superior catalytic activity can be attributed to modified Pt sites in PtRu nanoparticles, enabling strong methanol adsorption and weak carbon monoxide binding. Further, the PtRu catalyst demonstrates excellent stability in two-electrode methanol fuel cell tests with 85.3% current density retention and minimum Pt surface oxidation after 24 h. A direct Joule heating method produces PtRu nanoparticles with uniform size distribution. The nanoparticle formation is sensitive to heating temperature and time. The resulting uniform PtRu nanoparticles enable highly active and stable catalytic performance for the methanol oxidation reaction. image
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页数:9
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