Cyclic Voltammetry, FTIRS, and DEMS Study of the Electrooxidation of Carbon Monoxide, Formic Acid, and Methanol on Cyanide-Modified Pt(111) Electrodes
Cyclic Voltammetry, FTIRS, and DEMS Study of the Electrooxidation of Carbon Monoxide, Formic Acid, and Methanol on Cyanide-Modified Pt(111) Electrodes
复制标题
DOI：
10.1021/la8041154
复制
发表时间：
2009-06-02
期刊：
影响因子：
3.9
通讯作者：
Baltruschat, Helmut
中科院分区：
文献类型：
--
作者：
Cuesta, Angel;Escudero, Maria;Baltruschat, Helmut
我们采用氰化物修饰Pt（111）电极，结合循环伏安法（CV）、傅里叶变换红外光谱（FTIRS）和微分电化学质谱（DEMS）研究了甲酸和甲醇在Pt电极上的氧化反应。由于CO是甲酸和甲醇氧化过程中形成的有毒中间体，我们先前已经表征了氰化物修饰的Pt（111）电极上的CO吸附层。在甲酸和甲醇的情况下，氰化物改性的Pt（111）上的毒物形成几乎完全被抑制，因此，相应的电氧化反应完全通过反应性中间体途径进行。这些结果表明，在甲酸和甲醇的氧化中，吸附CO的形成需要至少三个连续的Pt原子的存在。
We have used cyanide-modified Pt(111) electrodes, in combination with cyclic voltammetry (CV), Fourier transform infrared spectroscopy (FTIRS), and differential electrochemical mass spectrometry (DEMS), to investigate the oxidation of formic acid and methanol on Pt electrodes. Since CO is the poison intermediate formed during the oxidation of both formic acid and methanol, we have previously characterized the CO adlayer on cyanide-modified Pt(111) electrodes. Poison formation on cyanide-modified Pt(111) is nearly completely inhibited in the case of formic acid and methanol, the corresponding electro-oxidation reaction proceeding, hence, exclusively through the reactive intermediate pathway. These results suggest that, in the oxidation of formic acid and methanol, the formation of adsorbed CO would require the presence of at least three contiguous Pt atoms.