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	Ligand-Mediated Electrocatalytic Activity of Pt Nanoparticles for Oxygen Reduction Reactions
	Zhou, Zhi-You ; Zhou ZY(周志有)
	2012-05-17
关键词	CAPPED PLATINUM NANOPARTICLES ELECTROCHEMICAL REDUCTION CATALYSTS SURFACES SIZE GOLD CO ENHANCEMENT ELECTRODES MOLECULES
英文摘要	High-performance electrocatalysts for oxygen reduction reactions (ORB.) are crucial for the development of proton exchange membrane fuel cells (PEMFCs). In this study, a novel method was developed by which the ORR activity of Pt nanoparticles was deliberately manipulated by selective organic capping ligands. By coreduction of diazonium salts and H2PtCl4, a series of Pt nanoparticles (core size 2.0-2.5 nm) stabilized by para-substituted (R = -CH3, -F, -Cl, -OCF3, and -CF3) phenyl groups were synthesized. The experimental results demonstrated that the electron-withdrawing capability of the substituent moieties, as manifested by the Hammet substituent constant (sigma), plays a key role in controlling the ORR activity, where the higher sigma, the higher ORB. activity. Within the present experimental context, Pt nanoparticles stabilized by trifluoromethylphenyl groups (Pt-Ar-CF3) exhibit the highest catalytic activity among the series, with an ORR specific activity 3.2 times higher than that of commercial Pt/C catalysts. The enhanced activity may be correlated with the weakened oxygen adsorption by the electronegative ligands.; National Science Foundation [CHE-1012258]; ACS [49137-ND10]; Department of Energy
语种	英语
出版者	AMER CHEMICAL SOC
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1021/jp300199x]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhou, Zhi-You,Zhou ZY. Ligand-Mediated Electrocatalytic Activity of Pt Nanoparticles for Oxygen Reduction Reactions[J],2012.
APA	Zhou, Zhi-You,&周志有.(2012).Ligand-Mediated Electrocatalytic Activity of Pt Nanoparticles for Oxygen Reduction Reactions..
MLA	Zhou, Zhi-You,et al."Ligand-Mediated Electrocatalytic Activity of Pt Nanoparticles for Oxygen Reduction Reactions".(2012).

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