Simple one-pot synthesis of platinum-palladium nanoflowers with enhanced catalytic activity and methanol-tolerance for oxygen reduction in acid media
Simple one-pot synthesis of platinum-palladium nanoflowers with enhanced catalytic activity and methanol-tolerance for oxygen reduction in acid media
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DOI：
10.1016/j.electacta.2014.06.052
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发表时间：
2014-08
影响因子：
6.6
通讯作者：
Jiening Zheng;Li-Li He-Li;Fang-Yi Chen;Ai-Jun Wang;Meng-Wei Xue;Jiu-Ju Feng
中科院分区：
文献类型：
--
作者：
Jiening Zheng;Li-Li He-Li;Fang-Yi Chen;Ai-Jun Wang;Meng-Wei Xue;Jiu-Ju Feng
在油胺体系中，通过溶剂热共还原乙酰丙酮铂（II）和乙酰丙酮钯（II）制备了铂钯（PtPd）纳米花。Koutecky-Levich曲线表明，该纳米结构对氧还原反应（ORR）的电催化活性明显增强，主要是由于Pt的d带中心下移，抑制了Pt-OH的生成.同时，PtPd纳米花显示出良好的甲醇耐受性和改善的ORR稳定性。计时电流测试表明，PtPd纳米花的电流在6000 s内保持在初始值的45.9%，远高于商业Pt（36.7%）和Pd（32.2%）黑催化剂的电流。因此，具有独特互连结构的PtPd纳米花可作为直接甲醇燃料电池的阴极催化剂。
In this work, bimetallic alloyed platinum-palladium (PtPd) nanoflowers are fabricated by one-pot solvothermal co-reduction of Pt (II) acetylacetonate and Pd (II) acetylacetonate in oleylamine system. The as-prepared nanostructures show the enhanced electrocatalytic activity for oxygen reduction reaction (ORR), dominated by a four-electron pathway based on the Koutecky-Levich plots, mainly owing to the inhibition of the formation of Pt–OHadvia the downshift of d-band center for Pt. Meanwhile, PtPd nanoflowers display good methanol tolerance and improved stability for ORR. The chronoamperometry test reveals that the current of PtPd nanoflowers remains 45.9% of its original value within 6000 s, much higher than those of commercial Pt (36.7%) and Pd (32.2%) black catalysts. Therefore, PtPd nanoflowers with unique interconnected structures can be used as a promising cathode catalyst in direct methanol fuel cells.