Dopant-Driven Nanostructured Loose-Tube SnO2 Architectures: Alternative Electrocatalyst Supports for Proton Exchange Membrane Fuel Cells
Dopant-Driven Nanostructured Loose-Tube SnO2 Architectures: Alternative Electrocatalyst Supports for Proton Exchange Membrane Fuel Cells
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DOI：
10.1021/jp404570d
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发表时间：
2013-09
影响因子：
3.7
通讯作者：
S. Cavaliere;S. Subianto;I. Savych;M. Tillard;Deborah J. Jones;J. Roziere
中科院分区：
文献类型：
--
作者：
S. Cavaliere;S. Subianto;I. Savych;M. Tillard;Deborah J. Jones;J. Roziere
采用传统的单针静电纺丝技术制备了一种新型的复杂松管（纤维-管）形貌的（Nb）-SnO 2，并提出了纤维-管结构的形成机理。铌的存在通过增强Kirkendall效应（其中前体盐在煅烧期间扩散到纤维表面）来驱动电纺氧化锡的形态从致密纤维到松散管。最高的电子电导率（0.02 S cm-1）的钙钛矿结构的铌掺杂的锡氧化物中观察到5重量%的Nb掺杂。松管形态的材料已被进一步功能化，通过沉积Pt纳米粒子制备的微波辅助多元醇的方法，并通过电子显微镜检查和研究其电化学性能的样品。Nb-SnO 2上13 wt % Pt的电化学活性表面积>50 m2 g-1，并且比Pt/C对电压循环更稳定。
A novel complex loose-tube (fiber-in-tube) morphology (Nb)–SnO2 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–1) 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–SnO2 is >50 m2 g–1, and is more stable to voltage cycling than Pt/C.