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应用电化学原位傅里叶变换红外反射光谱(in situ FTIRS)研究了酸性介质中Pt(110)单晶电极上吸附态CO(COad)和溶液相CO(COsol)的氧化过程.循环伏安测试表明,COsol氧化的峰电位比COad氧化的正移了168mV,其峰电流密度为后者的6.7倍.电化学原位红外光谱检测到CO主要生成线型的吸附态物种(COL),均匀分布在Pt(110)表面上.当溶液中不存在CO时,COL仅在电位高于0.15V才发生氧化.而且,该谱峰在其稳定吸附的电位区间内随电位增加蓝移,Stark系数为30cm-1·V-1;在COL发生氧化的电位区间,其谱峰强度随电位增加减小、峰位红移,线性变化率为-56cm-1·V-1.溶液中饱和CO时,原位红外光谱在-0.05V即可检测到CO2的存在,显示COL起始氧化的电位提前了200mV;电位高于-0.05V,该谱峰即发生红移,对应的线性变化率为-26.5cm-1·V-1.
The oxidation process of CO (COad) and CO (COsol) on the Pt (110) single crystal electrode in acid medium was investigated by electrochemical in-situ Fourier transform infrared spectroscopy (in situ FTIRS). The cyclic voltammetry The results showed that the peak potential of COsol oxidation was shifted by 168mV from that of COAD oxidation and the peak current density was 6.7 times higher than that of COAD oxidation.Analysis of CO mainly generated linearly adsorbed species (COL) by electrochemical in situ FTIR. Is distributed on the surface of Pt (110) .COL oxidizes only when the potential is higher than 0.15 V when CO is absent in the solution.Moreover, the peak shifts blue with the increase of potential in the stably adsorbed potential region, Stark coefficient Was 30cm-1 · V-1. At the potential of oxidation of COL, the peak intensity decreased with the increase of potential and the peak position was red-shifted with a linear change rate of -56cm-1 · V-1. , In-situ IR spectra at -0.05V can detect the presence of CO2, indicating that the initial oxidation of COL potentials advance 200mV; potential higher than -0.05V, the peak of that redshift occurs, the corresponding linear change rate of - 26.5 cm-1 · V-1.