PdAu合金催化剂制备及其氧还原性能研究
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摘要
用液相还原法合成了多种合金度的碳载PdAu纳米粒子,考察了其对氧还原反应的催化行为。研究表明Pd_(85)Au_(15)/C氧还原面积比活性最好,但由于其电化学面积小、利用率低,在燃料电池的实际应用中更关心的质量比活性小于气相还原法得到的Pd/C催化剂,因此该合金催化剂不适用于燃料电池阴极工作。
PdAu/C catalysts with different alloy degrees were prepared by liquid phase reduction method.The catalytic activity of the samples toward oxygen reduction reaction(ORR)were tested.Among these catalysts Pd_(85)Au_(15)/C exhibits the highest area specific catalytic activity toward ORR due to its small electrochemical area and low utilization degree.The mass specific activity of Pd_(85)Au_(15)/C is lower than that of Pd/C catalyst obtained by gas phase reduction method so that Pd_(85)Au_(15)/C is not suitable for the cathode of fuel cell.
PdAu/C catalysts with different alloy degrees were prepared by liquid phase reduction method.The catalytic activity of the samples toward oxygen reduction reaction(ORR)were tested.Among these catalysts Pd_(85)Au_(15)/C exhibits the highest area specific catalytic activity toward ORR due to its small electrochemical area and low utilization degree.The mass specific activity of Pd_(85)Au_(15)/C is lower than that of Pd/C catalyst obtained by gas phase reduction method so that Pd_(85)Au_(15)/C is not suitable for the cathode of fuel cell.
引文
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[4]ARROYO-RAMREZ L,MONTANO-SERRANO R,LUNA-PINEDA T,et al.Synthesis and Characterization of Palladium and Palladium-Cobalt Nanoparticles on Vulcan XC-72Rfor the Oxygen Reduction Reaction[J].ACS Appl Mater Interfaces,2013,5(22):11 603-11 612.
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[7]HAM H C,MANOGARAN D,LEE K H,et al.Enhanced Oxygen Reduction Reaction and Its Underlying Mechanism in Pd-Ir-Co Trimetallic Alloys[J].J Chem Phys,2013,139(20):201 104.
[8]WEN W,LI C,LI W,et al.Carbon-Supported PdCr Electrocatalysts for the Electrooxidation of Formic Acid that Demonstrate High Activity and Stability[J].Electrochim Acta,2013,109(11):201-206.
[9]LI S,CHENG D,QIU X,et al.Synthesis of Cu@Pd Core-shell Nanowires with Enhanced Activity and Stability for Formic Acid Oxidation[J].Electrochim Acta,2014,143:44-48.
[10]WU H,LI H,ZHAI Y,et al.Facile Synthesis of Free-Standing Pd-Based Nanomembranes with Enhanced Catalytic Performance for Methanol/Ethanol Oxidation[J].Adv Mater,2012,24(12):1 594-1 597.
[11]DU W X,MACKENZIE K E,MILANO D F,et al.Palladium-Tin Alloyed Catalysts for the Ethanol Oxidation Reaction in an Alkaline Medium[J].ACS Catal,2012,2(2):287-297.
[12]LI W,FAN F R F,BARD A J,The Application of Scanning Electrochemical Microscopy to the Discovery of Pd-W Electrocatalysts for the Oxygen Reduction Reaction that Demonstrate High Activity,Stability,and Methanol Tolerance[J].J Solid State Electrochem,2012,16(7):2 563-2 568.
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[14]SEROV A,MARTINEZ U,FALASE A,et al.Highly Active PdCu Catalysts for Electrooxidation of2-Propanol[J].Electrochem Commun,2012,22(1):193-196.
[15]ZHANG H,HAO Q,GENG H,et al.Nanoporous PdCu Alloys as Highly Active and Methanol-Tolerant Oxygen Reduction Electrocatalysts[J].Int J Hydrogen Energy,2013,38(24):10 029-10 038.
[16]SHEN L,LI H,LU L,et al.Improvement and Mechanism of Electrocatalytic Performance of Pd-Ni/C Anodic Catalyst in Direct Formic Acid Fuel Cell[J].Electrochim Acta,2013,89(1):497-502.
[17]RYU J,CHOI J,LIM D H,et al.Morphology-Controlled Synthesis of Ternary Pt-Pd-Cu Alloy Nanoparticles for Efficient Electrocatalytic Oxygen Reduction Reactions[J].Appl Catal B,2015,(174-175):526-532.
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