碳载Pt/Sb_(ad)电极上乙醇电催化氧化特征和原位FTIR反射光谱研究  

In-situ FTIR Spectroscopic Study of Electrocatalytic Oxidation of CH_3CH_2OH on Sb Modified nm-Pt/GC Electrode

作　　者：陈国良[1] 孙世刚[2] 陈声培[2] 周志有[2] 

机构地区：[1]漳州师范学院化学系 [2]厦门大学固体表面物理化学国家重点实验室,化学系厦门361005

出　　处：《应用化学》2001年第6期432-435,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金 (2 983 3 0 60 ;2 95 2 5 3 0 7);国家教育部研究基金 (99177;19990 3 840 3 )资助

摘　　要：用电化学循环伏安法和原位 FTIR反射光谱法研究了 Sb在碳载纳米 Pt膜电极 (nm -Pt/ GC)表面不可逆吸附的电化学特性及酸性介质中乙醇的吸附和电催化氧化特性 .结果指出 ,当扫描电位的上限 Eu≤0 .5 0 V(SCE)时 ,Sbad可以稳定地吸附在 nm-Pt/ GC电极表面 .与未修饰的 nm-Pt/ GC电极上结果相比 ,Sbad修饰的 nm-Pt/ GC/ Sbad/ (nm-Pt/ GC)的催化活性显著增加 .测得当覆盖度θsb=0 .1 3 7时 ,修饰电极对乙醇的电催化活性最高 ,乙醇氧化的峰电位负移了 0 .1 5 V,峰电流增大了 1倍 .原位 FTIR反射光谱的结果从分子水平揭示了 Sb修饰对乙醇氧化反应途径的选择功能 .The electrochemical behavior of irreversibly adsorbed antimony on nm- Pt/GC have been studied by cyclic voltammetry and in-situ FTIR spectrometry. The results showed that the adatoms of Sb were stable on the surface of nm-Pt/GC when the scanning potentials were below 0.50 V(SCE). In comparison with the unmodified nm-Pt/GC electrode, the Sb_ad/nm-Pt/GC electrode manifested significant increase in catalytic activity for oxidation of ethanol, and the maximum activity was found when the coverage of Sb_ad was 0.137. The oxidation peak potential in this case negatively shifted to about 150 mV with peak current being double increased.

关 键 词：吸附 原位FTIRS 乙醇 电催化氧化 碳载纳米铂电极 薄膜电极 锑 修饰 电极 

分 类 号：O623.411[理学—有机化学] O646.5[理学—化学]