Platinum nanoparticles functionalized with acetylene derivatives: Electronic conductivity and electrocatalytic activity in oxygen reduction

CORC > 厦门大学 > 化学化工－已发表论文

	Platinum nanoparticles functionalized with acetylene derivatives: Electronic conductivity and electrocatalytic activity in oxygen reduction
	Liu, Ke ; Kang, Xiongwu ; Zhou, Zhi-You ; Song, Yang ; Lee, Lyman J. ; Tian, Daniel ; Chen, Shaowei ; Zhou ZY(周志有)
刊名	http://dx.doi.org/10.1016/j.jelechem.2012.07.009
	2013
关键词	RUTHENIUM NANOPARTICLES INTERVALENCE TRANSFER ENHANCEMENT NANOTUBES CHEMISTRY SURFACES CONTACTS MOIETIES BONDS CO
英文摘要	National Science Foundation [CHE - 1012256, DMR - 0804049]; ACS Petroleum Research Fund [49137 - ND10]; Stable platinum nanoparticles were prepared by the self assembly of acetylene derivatives (1-alkynes, 4-ethylphenylacetylene, and 4-tert-butylphenylacetylene) onto bare Pt colloid surfaces. Transmission electron microscopic measurements showed that the nanoparticles exhibited an average core size of 2.85 +/- 0.62 nm. FTIR study showed that with the acetylene ligands adsorbed onto the Pt nanoparticle surface, the C-H vibrational stretches disappeared completely, along with a substantial redshift of the C C vibrational stretch, as compared to those of the monomeric ligands. These were ascribed to the breaking of the C-H bond and the formation of Pt-surface-H and Pt-surface-C at the metal-ligand interface. The conjugated bonding interactions between the triple bond and Pt were found to lead to extensive intraparticle charge delocalization between the acetylene moieties, and hence unique photoluminescence properties of the nanoparticles. For nanoparticles functionalized with 4-ethylphenylacetylene or 4-tert-butylphenylacetylene, the excitation and emission peak positions showed an apparent redshift as compared to those of 1-alkyne-capped platinum nanoparticles. Electronic conductivity measurements of the nanoparticle solids showed that for the nanoparticles capped with 1-alkynes or 4-ethylphenylacetylene, the temperature dependence of the ensemble conductivity was consistent with that of semiconducting materials, whereas for the 4-tert-butylphenylacetylene-capped nanoparticles, metallic behaviors were observed instead. An apparent discrepancy was also observed in the electrocatalytic reduction of oxygen in alkaline media, where the specific activity was all markedly better than that of commercial Pt/C catalysts, with the best performance by the 4-ethyphenylacetylene-capped Pt nanoparticles. These observations were accounted for by the deliberate manipulation of the electronic structure of the Pt nanoparticles by the organic ligands. (C) 2012 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE SA
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88803]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Liu, Ke,Kang, Xiongwu,Zhou, Zhi-You,et al. Platinum nanoparticles functionalized with acetylene derivatives: Electronic conductivity and electrocatalytic activity in oxygen reduction[J]. http://dx.doi.org/10.1016/j.jelechem.2012.07.009,2013.
APA	Liu, Ke.,Kang, Xiongwu.,Zhou, Zhi-You.,Song, Yang.,Lee, Lyman J..,...&周志有.(2013).Platinum nanoparticles functionalized with acetylene derivatives: Electronic conductivity and electrocatalytic activity in oxygen reduction.http://dx.doi.org/10.1016/j.jelechem.2012.07.009.
MLA	Liu, Ke,et al."Platinum nanoparticles functionalized with acetylene derivatives: Electronic conductivity and electrocatalytic activity in oxygen reduction".http://dx.doi.org/10.1016/j.jelechem.2012.07.009 (2013).