Dopant-Driven Nanostructured Loose-Tube SnO2 Architectures: Alternative Electrocatalyst Supports for Proton Exchange Membrane Fuel Cells

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• 作者：Sara Cavaliere ; Surya Subianto ; Iuliia Savych ; Monique Tillard ; Deborah J. Jones ; Jacques Rozi猫re
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：September 12, 2013
• 年：2013
• 卷：117
• 期：36
• 页码：18298-18307
• 全文大小：607K
• 年卷期：v.117,no.36(September 12, 2013)
• ISSN：1932-7455

文摘

A novel complex loose-tube (fiber-in-tube) morphology (Nb)鈥揝nO₂ has been prepared by conventional, single-needle electrospinning, and a mechanism for the formation of fiber-in-tube structures is proposed. The presence of niobium drives the morphology of electrospun tin oxide from dense fibers to loose tubes by enhancing the Kirkendall effect where precursor salts diffuse to the fiber surface during calcination. The highest electronic conductivity (0.02 S cm^鈥?) of the cassiterite structured niobium-doped tin oxides is observed with 5 wt % Nb doping. The loose-tube morphology materials have been further functionalized by depositing Pt nanoparticles prepared by a microwave assisted polyol method, and the samples examined by electron microscopy and studied for their electrochemical properties. The electrochemically active surface area of 13 wt % Pt on Nb鈥揝nO₂ is >50 m² g^鈥?, and is more stable to voltage cycling than Pt/C.