Ultra-low Pt loading catalytic layer based on buckypaper for oxygen reduction reaction
Ultra-low Pt loading catalytic layer based on buckypaper for oxygen reduction reaction
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DOI：
10.1016/j.ijhydene.2014.03.054
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发表时间：
2014-08
影响因子：
7.2
通讯作者：
Junsheng Zheng;Tian Tian-Tian;Yuan Gao;Qiang Wu;J. Ma;Jim P. Zheng
中科院分区：
文献类型：
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作者：
Junsheng Zheng;Tian Tian-Tian;Yuan Gao;Qiang Wu;J. Ma;Jim P. Zheng
Buckypaper是一种独立的、自我支撑的、清晰的膜状黑色薄膜。我们开发了一种含有富MWNTs表面和富CNFS表面的Buckypaper薄膜。采用溅射法制备了铂含量为0.05 mg/cm2的铂纳米粒子作为氧还原反应的催化层。研究了该纳米复合材料的物化性能和电化学性能。作为对比，采用电沉积法制备了铂含量为0.10 mg/cm2的负载铂纳米粒子。结果表明，与铂/BP-ED相比，铂/BP-SP具有更小的粒径和更均匀的分布。循环伏安研究表明，尽管铂含量低于铂/BP-ED，但其具有较高的电化学比表面积。Tafel研究表明，铂/BP-SP具有移动正平衡电位和较高的表观交换电流密度。此外，线性扫描伏安分析结果表明，与铂/BP-ED相比，铂/BP-SP具有更高的氧化还原活性，不同转速下的线性扫描伏安分析表明，铂/BP-SP电极上的氧化还原是一个4E的−过程。
Buckypaper is a freestanding, self-supported and well defined membrane-like black thin film. We developed a buckypaper film containing a MWNTs-rich surface and a CNFs-rich surface. Pt nanoparticles supported on this film with an ultra-low Pt content, 0.05 mg/cm2, as a catalytic layer for oxygen reduction reaction (ORR) were synthesized by a sputtering process (Pt/BP-SP). The physical and chemical properties as well as electrochemical performance of this nanocomposite were studied. For comparison, Pt nanoparticles supported on buckypaper with a Pt content of 0.10 mg/cm2were prepared by an electrodeposition process (Pt/BP-ED). The results proved that Pt/BP-SP possessed a smaller particle size and a more uniform distribution on buckypaper than Pt/BP-ED. Cyclic voltammetric investigation showed that Pt/BP-SP had a higher electrochemical surface area although its Pt content was lower than that of Pt/BP-ED. Tafel studies proved that Pt/BP-SP had a move positive equilibrium potential and a higher apparent exchange current density. Moreover, the results of linear sweep voltammetric (LSV) analysis exhibited that Pt/BP-SP had a higher ORR activity compared with Pt/BP-ED, and LSV at different rotation rates revealed that ORR on Pt/BP-SP electrode was a 4e−process.