An ordered structured cathode based on vertically aligned Pt nanotubes for ultra-low Pt loading passive direct methanol fuel cells
An ordered structured cathode based on vertically aligned Pt nanotubes for ultra-low Pt loading passive direct methanol fuel cells
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基于垂直排列 Pt 纳米管的有序结构阴极，用于超低 Pt 负载被动直接甲醇燃料电池
DOI：
10.1016/j.electacta.2017.09.038
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发表时间：
2017-10
影响因子：
6.6
通讯作者：
Yang Hui
中科院分区：
文献类型：
--
作者：
Wang Guoliang;Lei Linfeng;Jiang Jingjing;Zhou Yi;Huang Qinghong;Zou Zhiqing;Jiang San Ping;Yang Hui
结合牺牲模板法和原位电置换法制备了用于超低载铂量被动直接甲醇燃料电池（DMFC）的基于可控垂直排列Pt纳米管的有序纳米结构阴极。Pt纳米管由高度分散的Pt纳米颗粒壳层组成，平均厚度约为100 μ m。15纳米。作为氧还原反应（ORR）电催化剂，它表现出类似的活性，但更好的耐用性比商业铂黑。作为被动DMFC的阴极，通过有序纳米结构阴极获得了77.48 m2 g-1（Pt）的高电化学比表面积，这是常规Pt/C基阴极（19.46 m2 g-1（Pt））的3倍，表明Pt催化剂利用率的显著提高。令人印象深刻的是，通过使用垂直排列的Pt纳米管催化层，阴极侧的Pt负载量可以减少到常规MEA的约1/7（0.12mgcm-2），而不牺牲电池性能。该方法为制备超低铂负载量燃料电池有序纳米结构阴极提供了一种新的途径。
Ordered nanostructured cathodes based on controlled vertically aligned Pt nanotubes are fabricated via combining sacrificial template method and in-situ galvanic replacement for ultra-low Pt loading passive direct methanol fuel cells (DMFCs). The Pt nanotubes are composed of highly dispersed Pt nanoparticles shell with an average thickness of ca. 15 nm. Employed as the oxygen reduction reaction (ORR) electrocatalyst, it exhibits similar activity but better durability than that of the commercial Pt black. Serving as the cathode for passive DMFC, a high electrochemical specific area of 77.48 m2g−1(Pt)is obtained by the ordered nanostructured cathode, which is 3 times higher than that of the conventional Pt/C based cathode (19.46 m2g−1(Pt)), indicating a significant improvement in the Pt catalyst utilization. Impressively, the Pt loading at the cathode side can be reduced to approximately 1/7 (0.12 mgcm−2) of the conventional MEA without sacrificing cell performance by using the vertically aligned Pt nanotubes catalytic layer. This method may provide a new way to fabricate ordered nanostructured cathode for ultra-low Pt loadings fuel cells.
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