Effect of plating bath composition on chemical composition and oxygen reduction reaction activity of electrodeposited Pt-Co catalysts

被引：28
作者：
Puangsombut, Pranee [1 ]
Tantavichet, Nisit [1 ,2 ,3 ]
机构：
[1] Chulalongkorn Univ, Fac Sci, Dept Chem Technol, Bangkok 10330, Thailand
[2] Chulalongkorn Univ, Ctr Excellence Petrochem & Mat Technol, Bangkok 10330, Thailand
[3] Chulalongkorn Univ, Res Unit Adv Mat Energy Storage, Bangkok 10330, Thailand
来源：
RARE METALS | 2019年 / 38卷 / 02期
关键词：
Pt-Co alloy; Electrodeposition; Electrocatalyst; Oxygen reduction reaction; Proton exchange membrane fuel cell; GALVANOSTATIC PULSE ELECTRODEPOSITION; MEMBRANE-FUEL-CELLS; ELECTROCATALYTIC ACTIVITY; ELECTROCHEMICAL CHARACTERIZATION; NANOSTRUCTURED PLATINUM; SURFACE-PROPERTIES; HIGH-TEMPERATURE; ALLOY CATALYSTS; AREA PLATINUM; GLASSY-CARBON;
D O I：
10.1007/s12598-018-1082-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Platinum-cobalt (Pt-Co) alloy electrocatalysts were prepared on pretreated carbon cloth by electrodeposition from different plating baths with the aim of finding suitable plating bath conditions that could control the chemical composition of the Pt-Co alloy electrodeposits over a wide range (from 0 to 100at% Pt) and then to study the relationship of the deposit composition on the oxygen reduction reaction (ORR) electroactivity. The type of supporting electrolyte, the solution pH, Pt and Co concentrations of the plating bath and the current density used for electrodeposition all play a crucial role in the composition of the electrodeposited Pt-Co alloy. Pt contents in all the Pt-Co alloys deposited in H2SO4 are at a relatively high and narrow level (83at%-97at% Pt), regardless of the electrodeposition conditions used. While the Pt contents in the Pt-Co alloys deposited in Na2SO4 could reach a very low and broad level (5at%-97at% Pt), evidence of Co oxide formation is observed. Of the three supporting electrolytes studied, only NaCl effectively produces Pt-Co deposits over a wide range of compositions (8-90at% Pt) by controlling the Pt and Co concentrations of the plating bath and using the high enough current density. The results show a qualitative correlation between Pt-Co deposit composition and ORR activity, where Pt-Co alloy catalysts with45at% Pt tend to yield higher ORR activities than the pure Pt catalyst, with the best ORR performance obtained from the Pt-Co alloy catalyst with 78at% Pt.
引用
收藏
页码：95 / 106
页数：12
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