期刊
ELECTROCHIMICA ACTA
卷 85, 期 -, 页码 492-500出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.08.005
关键词
Glancing angle deposition; Niobium oxide; Oxygen reduction reaction; Catalyst support
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC), Micralyne
- Ballard Power Systems
- Automotive Fuel Cell Cooperation (AFCC) through the National Research Council Technology Development Program (TDP)
- Alberta Innovates: Technology Futures
Metal oxides such as niobium oxides have been demonstrated as alternative support materials for Pt and non-precious metal catalysts in fuel cells. High surface area and columnar niobium oxide catalyst support structures were produced by the glancing angle deposition (GLAD) technique on 5 mm diameter glassy carbon disks. The columnar structures have lengths of about 500 nm, diameters of 50 nm and an areal density of about 10(9) cm(-2). Annealing under different gas mixtures (Ar/H-2) led to the formation of various oxides (Nb2O5, NbO2, or NbO + NbO2). Pt catalyst, with a loading of 0.1 mg(pt) cm(-2), was deposited onto these structures by magnetron sputter deposition. Rotating disk electrode characterization of the samples, performed in 0.1M HClO4 electrolyte at room temperature, revealed surface enhancement factors of up to 11 and oxygen reduction specific activities of >= 1 mA cm(pt)(-2) at 0.9 V (vs. RHE). The impact of annealing on Nb-O phase formation, conductivity, oxygen reduction activity and stability are discussed. (C) 2012 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据