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学科主题: 物理化学
题名: Supported Noble Metals on Hydrogen-Treated TiO2 Nanotube Arrays as Highly Ordered Electrodes for Fuel Cells
作者: Zhang, Changkun1, 2;  Yu, Hongmei1;  Li, Yongkun1, 2;  Gao, Yuan1, 2;  Zhao, Yun1, 2;  Song, Wei1;  Shao, Zhigang1;  Yi, Baolian1
通讯作者: 俞红梅 ;  邵志刚
关键词: catalysis ;  electrochemistry ;  fuel cells ;  hydrogenation ;  nanotubes
刊名: CHEMSUSCHEM
发表日期: 2013-04-01
DOI: 10.1002/cssc.201200828
卷: 6, 期:4, 页:659-666
收录类别: SCI
文章类型: Article
部门归属: DNL03
项目归属: DNL0301
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
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.
关键词[WOS]: OXYGEN REDUCTION REACTION ;  TITANIUM-DIOXIDE ;  NANOWIRE ARRAYS ;  ELECTROCATALYTIC ACTIVITY ;  PLATINUM CATALYST ;  ANODIC-OXIDATION ;  HEAT-TREATMENT ;  CARBON-FREE ;  WATER ;  DURABILITY
语种: 英语
WOS记录号: WOS:000317367400015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117663
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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