Controllable Modification of the Electronic Structure of Carbon-Supported Core鈥揝hell Cu@Pd Catalysts for Formic Acid Oxidation

详细信息    查看全文

• 作者：Mingjun Ren ; Yi Zhou ; Feifei Tao ; Zhiqing Zou ; Daniel L. Akins ; Hui Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：June 19, 2014
• 年：2014
• 卷：118
• 期：24
• 页码：12669-12675
• 全文大小：438K
• 年卷期：v.118,no.24(June 19, 2014)
• ISSN：1932-7455

文摘

This study analyzes the synthesis of carbon-supported core鈥搒hell structured Cu@Pd catalysts (Cu@Pd/C) through a galvanic replacement reaction to be utilized in the electrocatalytic oxidation of formic acid. The strategy used in this study explores the relationship among lattice strain, electronic structure, and catalytic performance. X-ray diffraction and X-ray photoelectron spectroscopy indicate that the inclusion of Cu in the nanocatalyst increases lattice strain and results in a downshift of the d-band of palladium. Electrochemical tests show that Cu@Pd/C catalysts exhibit weaker adsorption strength for CO with increased Cu content, which can be attributed to the downshift of the electronic d-band. For the synthesized materials, the Cu@Pd/C catalyst with a Cu:Pd atomic ratio of 27:73 is found to have the highest activity for formic acid oxidation. A peaklike plot between activity and atomic composition is acquired and reveals the relationship among lattice strain, electronic structure, and catalytic performance.