The study of Pt@Au electrocatalyst based on Cu underpotential deposition and Pt redox replacement
The study of Pt@Au electrocatalyst based on Cu underpotential deposition and Pt redox replacement
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DOI：
10.1016/j.electacta.2008.12.004
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发表时间：
2009-04
影响因子：
6.6
通讯作者：
Yaolun Yu;Yue Hu;Xue‐Wei Liu;Weiqiao Deng;Xin Wang
中科院分区：
文献类型：
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作者：
Yaolun Yu;Yue Hu;Xue‐Wei Liu;Weiqiao Deng;Xin Wang
对Cu欠电位沉积（UPD）-Pt氧化还原置换法制备的修饰Pt@Au催化剂进行了电化学研究。研究了在硫酸电解液中，UPD电位、沉积时间和电位扫描速率对Au/C纳米粒子上Cu UPD的影响。采用阳极剥离法计算了沉积Cu吸附层的电荷。结果表明，该方法制备的Pt@Au催化剂不是核壳结构，而是修饰结构。合成了一系列不同Pt覆盖率的修饰Pt@Au/C催化剂，并考察了其对甲酸氧化（FAO）的催化性能。研究发现，Pt原子的比活度随Pt在Au表面覆盖度的减小而增大。寿命测试表明，修饰后的Pt@Au/C催化剂对FAO的稳定性优于Pt/C催化剂。
Electrochemical study of the decorated Pt@Au catalyst synthesized by Cu underpotential deposition (UPD)-Pt redox replacement technique has been conducted in this work. The parameters affecting the Cu UPD on Au/C nanoparticles in sulfuric acid electrolyte, including the UPD potential, deposition time and potential sweep rate, were investigated in detail. Anode stripping method was used to calculate the charge of the deposited Cu adlayers. Results showed that Pt@Au catalyst prepared by this UPD-redox replacement approach is not a core-shell structure but a decorated structure. A series of decorated Pt@Au/C catalysts with various Pt coverages were synthesized and examined for formic acid oxidation (FAO). It is found that the specific activity of Pt atoms increases with the decrease of Pt surface coverage on Au. Life test showed that better stability was pertained for this decorated Pt@Au/C catalyst compared to Pt/C towards FAO.