Supported Noble Metals on Hydrogen-Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells

	Supported Noble Metals on Hydrogen-Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells
	Zhang, Changkun 1,2; Yu, Hongmei 1; Li, Yongkun 1,2; Gao, Yuan 1,2; Zhao, Yun 1,2; Song, Wei 1; Shao, Zhigang 1; Yi, Baolian 1
刊名	chemsuschem
	2013-04-01
卷号	6 期号:4 页码:659-666
关键词	catalysis electrochemistry fuel cells hydrogenation nanotubes
通讯作者	俞红梅 ; 邵志刚
产权排序	1,1
英文摘要	hydrogen-treated tio2 nanotube (htnt) arrays serve as highly ordered nanostructured electrode supports, which are able to significantly improve the electrochemical performance and durability of fuel cells. the electrical conductivity of htnts increases by approximately one order of magnitude in comparison to air-treated tnts. the increase in the number of oxygen vacancies and hydroxyl groups on the htnts help to anchor a greater number of pt atoms during pt electrodeposition. the htnts are pretreated by using a successive ion adsorption and reaction (siar) method that enhances the loading and dispersion of pt catalysts when electrodeposited. in the siar method a pd activator can be used to provide uniform nucleation sites for pt and leads to increased pt loading on the h-tnts. furthermore, fabricated pt nanoparticles with a diameter of 3.4nm are located uniformly around the pretreated htnt support. the as-prepared and highly ordered electrodes exhibit excellent stability during accelerated durability tests, particularly for the htnt-loaded pt catalysts that have been annealed in ultrahigh purity h2 for a second time. there is minimal decrease in the electrochemical surface area of the as-prepared electrode after 1000cycles compared to a 68% decrease for the commercial jm 20% pt/c electrode after 800cycles. x-ray photoelectron spectroscopy shows that after the htnt-loaded pt catalysts are annealed in h2 for the second time, the strong metalsupport interaction between the htnts and the pt catalysts enhances the electrochemical stability of the electrodes. fuel-cell testing shows that the power density reaches a maximum of 500mwcm2 when this highly ordered electrode is used as the anode. when used as the cathode in a fuel cell with extra-low pt loading, the new electrode generates a specific power density of 2.68kwgpt1. it is indicated that htnt arrays, which have highly ordered nanostructures, could be used as ordered electrode supports.
学科主题	物理化学
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, multidisciplinary
研究领域[WOS]	chemistry
关键词[WOS]	oxygen reduction reaction ; titanium-dioxide ; nanowire arrays ; electrocatalytic activity ; platinum catalyst ; anodic-oxidation ; heat-treatment ; carbon-free ; water ; durability
收录类别	SCI
语种	英语
WOS记录号	WOS:000317367400015
公开日期	2013-10-11
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/117663]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, Fuel Cell Syst & Engn Lab, Dalian 116023, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Changkun,Yu, Hongmei,Li, Yongkun,et al. Supported Noble Metals on Hydrogen-Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells[J]. chemsuschem,2013,6(4):659-666.
APA	Zhang, Changkun.,Yu, Hongmei.,Li, Yongkun.,Gao, Yuan.,Zhao, Yun.,...&Yi, Baolian.(2013).Supported Noble Metals on Hydrogen-Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells.chemsuschem,6(4),659-666.
MLA	Zhang, Changkun,et al."Supported Noble Metals on Hydrogen-Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells".chemsuschem 6.4(2013):659-666.