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Determination of the Real Surface Area of Palladium Electrode
Lan-lan Fang,Qian Tao,Ming-fang Li,Ling-wen Liao,Dong Chen,Yan-xia Chen*
Author NameAffiliationE-mail
Lan-lan Fang Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Qian Tao Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Ming-fang Li Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Ling-wen Liao Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Dong Chen Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China  
Yan-xia Chen* Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, Uni-versity of Science and Technology of China, Hefei 230026, China yachen@ustc.edu.cn 
Abstract:
Four methods, including voltammetric measurement of double layer capacitance, surface oxides reduction, under potential deposition of Cu and carbon monoxide (CO) stripping have been applied to evaluate the real surface area of a polycrystalline Pd (pc-Pd) electrode. The results reveal that the second and third methods lead to consistent results with deviations below 5%. And from the determined double layer capacitance and CO stripping charge, it is deduced that the double layer capacity unit area is 23.1±0.4 μF/cm2 and the saturated CO adlayer should be ca. 0.66 ML in order to ensure that the real surface area as determined is consistent with the other two techniques. The applicability as well as the attentions when applying these techniques for the determination of the real surface area of pc-Pd electrodes have been discussed.
Key words:  Polycrystalline Pd electrode, Real surface area, Double layer capacitance, Oxygen adsorption, Under potential deposition, CO stripping
FundProject:
钯电极活性表面积的计算
方兰兰,陶骞,李明芳,廖玲文,陈栋,陈艳霞*
摘要:
通过测量双电层电容、氧化物还原、欠电位沉积铜和一氧化碳脱附的电量四种方法估算了多晶钯电极的活性表面积. 结果表明,使用第二和第三种方法计算得到的钯电极活性表面积有较好的一致性,误差小于5%,为了使另外两种方法计算得到的面积与之相近,推断单位面积双电层电容双电层电容23.1±0.4 μF/cm2 ,饱和吸附一氧化碳的覆盖度大约为0.66 ML,讨论了使用这些方法在确定多晶钯电极活性面积时的关键步骤及适用性.
关键词:  多晶钯电极,活性表面积,双电层电容,氧吸附,欠电位沉积,一氧化碳脱附
DOI:10.1088/1674-0068/23/05/543-548
分类号: