Porous platinum mesoflowers with enhanced activity for methanol oxidation reaction

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• 作者：Lina Zhuang ; Wenjin Wang ; Feng Hong ; Shengchun Yang ; ^{ysch1209@mail.xjtu.edu.cn} ; Hongjun You ; ^{hjyou@mail.xjtu.edu.cn} ; Jixiang Fang ; Bingjun Ding
• 关键词：Noble metal ; Platinum mesoflower ; Methanol oxidation reaction ; Porous nanostructure
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：191
• 期：Complete
• 页码：239-245
• 全文大小：1246 K

文摘

Porous Pt and Pt-Ag alloy mesoflowers (MFs) with about 2 ¦Ìm in diameter and high porosity were synthesized using Ag mesoflowers as sacrificial template by galvanic reaction. The silver content in Pt-Ag alloys can be facilely controlled by nitric acid treatment. And the pure Pt MFs can be obtained by selective removal of silver element from Pt₇₂Ag₂₈ MFs electrochemically. Both Pt₄₅Ag₅₅, Pt₇₂Ag₂₈ and pure Pt show a high catalytic performance in methanol oxidation reaction (MOR). Especially, pure Pt MFs exhibited a 2 to 3 times current density enhancement in MOR compared with the commercial used Pt black, which can be attributed to their porous nanostructure with 3-dimentional nature and small crystal sizes.