High stability three-dimensional porous PtSn nano-catalyst for ethanol electro-oxidation reaction
High stability three-dimensional porous PtSn nano-catalyst for ethanol electro-oxidation reaction
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高稳定性三维多孔PtSn纳米催化剂用于乙醇电氧化反应
DOI：
10.1016/j.cclet.2020.04.025
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发表时间：
2020-04
影响因子：
9.1
通讯作者：
Song Liu
中科院分区：
文献类型：
--
作者：
Yue Sun;Haiyan Xiang;Huimin Li;Gang Yu;Hong Chen;Song Liu
除了理论研究外，直接乙醇燃料电池在实际应用中也有很大的潜力。直接乙醇燃料电池的性能在很大程度上取决于电催化剂。铂基电催化剂以其高的催化活性和良好的耐久性，成为直接乙醇燃料电池的重要候选材料。本文设计并通过两步液相还原反应合成了具有独特三维多孔纳米结构的PtSn催化剂。Sn在PtSn合金颗粒（约3.5 nm）中形成自支撑框架。在乙醇电氧化反应中，PtSn催化剂比Pt/C催化剂具有更高的质量活性和更长的循环寿命。通过电位循环前后的形貌表征，PtSn合金基纳米催化剂表现出良好的稳定性。PtSn催化剂有效地避免了由于外载体而导致的结构不稳定性，并延长了Sn的浸出时间。此外，引入一定量的Sn还可以解决Pt表面活性位的中毒现象。多孔合金纳米催化剂的设计策略为其在直接乙醇燃料电池中的应用奠定了基础。
In addition to the theoretical research, direct ethanol fuel cells have great potential in practical applications. The performance of direct ethanol fuel cells largely depends on the electrocatalysts. Pt-based electrocatalysts have been promising candidates for advancing direct ethanol fuel cells for its high catalytic activity and great durability. Here, a PtSn catalyst with unique three-dimensional porous nanostructure has been designed and synthesizedviaa two-step liquid phase reduction reaction. Sn formed a self-supporting framework in PtSn alloy particles (∼3.5 nm). In ethanol electro-oxidation reaction, the PtSn catalyst exhibited high mass activity and excellent recycling time compared with that of Pt/C. After the morphology characterization before and after potential cycling, the PtSn alloy-based nano-catalyst showed good stability. The PtSn catalysts effectively avoid structural instability due to the external carriers, and prolong the leaching time of Sn. In addition, the introduction of a certain amount of Sn can also solve the poisoning phenomenon of active sites on Pt surface. The design strategy of porous alloy nano-catalyst sheds light on its applications in direct ethanol fuel cells.
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