Pt电极上Sb,S吸附原子对正丁醇电催化氧化性能的影响  

EFFECT OF ADATOMS Sb AND S ON Pt ELECTRODE TOWARDS 1-BUTANOL ELECTROOXIDATION

作　　者：林珩[1] 陈声培[2] 卢江红[1] 陈国良[1] 

机构地区：[1]漳州师范学院化学系,福建漳州363000 [2]厦门大学化学系固体表面物理化学国家重点实验室,福建厦门361005

出　　处：《燃料化学学报》2003年第4期367-371,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(29833060);福建省科研基金(K2001101)~~

摘　　要：运用电化学循环伏安和石英晶体微天平研究了0 1mol/LH2SO4溶液中正丁醇(1 BL)在Pt电极和以Sb,S吸附原子修饰的Pt(Pt/Sbad和Pt/Sad)电极上电催化氧化过程。从电极表面质量变化表明正丁醇的氧化与电极表面氧物种有着极其密切的关系。Pt电极表面Sb吸附原子能在较低的电位下吸附氧,可显著提高正丁醇电催化氧化活性。与Pt电极相比较,Sb吸附原子修饰的Pt电极使正丁醇氧化的峰电位负移了0 33V,峰电流增大了近一倍。相反,Pt电极表面S吸附原子的氧化会消耗表面氧物种,抑制了正丁醇的电氧化。本文从表面质量变化提供了吸附原子电催化作用的新数据。The processes of adsorption and oxidation of 1-butanol on Pt electrode and Pt electrodes modified with Sb and S (Pt/Sb ad and Pt/S ad ) were studied by cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM) The results demonstrated that the oxidation of 1-butanol depends strongly on the oxidation states of electrode surface Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials, and exhibit catalytic effects for 1-butanol oxidation In comparison with the case of Pt electrode, the oxidation peak potential of 1-butanol on Pt surface modified with Sb was negatively shifted about 330?mV and the peak current was doubly increased On a contrary, the oxidation of S adatoms consumes oxygen species of Pt electrode surface As a consequence, the oxidation of 1-butanol was inhibited by the presence of S ad The EQCM studies provided quantitative results of surface mass changes during 1-butanol oxidation, and have thrown new light on elucidating different effects of adatoms Sb ad and S ad on Pt electrode towards 1-butanol oxidation

关 键 词：石英晶体微天平 铂电极 修饰电极 正丁醇 电催化氧化 

分 类 号：O646.54[理学—物理化学] O433[理学—化学]