Pt电极上Sb吸附原子对甲酸电催化氧化性能的影响  

Effect of adatom Sb on Pt electrodes towards formic acid electrooxidation

作　　者：卢江红[1] 林进妹[1] 林爱兰[1] 李鲤燕[1] 黄如莺[1] 陈国良[1] 

机构地区：[1]漳州师范学院化学系,福建漳州363000

出　　处：《福州大学学报（自然科学版）》2003年第6期747-750,共4页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(E0310026).

摘　　要：运用电化学循环伏安(CV)和电化学原位石英晶体微天平(EQCM)研究了Pt电极表面不可逆吸附Sb原子的电化学特性以及Pt电极上Sb吸附原子对0.1mol·L-1H2SO4溶液中甲酸电催化氧化性能的影响.研究发现,当扫描电位的上限Eu≤0.50V(vs.SCE)时,Sbad可以稳定地吸附在Pt电极表面,饱和覆盖度为0.34;Pt电极表面Sb吸附原子能在较低的电位下吸附氧,可显著提高甲酸电催化氧化活性.与Pt电极相比较,Sb饱和吸附原子修饰的Pt电极使甲酸氧化的峰电流增加了近5倍.The electrochemical behaviors of irreversibly adsorbed antimony on Pt electrode and the processes of adsorption and oxidation of formic acid on Pt, Pt/Sbad electrodes were studied by using cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The results demonstrated that the Sb adatoms are stable on Pt electrode when the electrode potentials are below 0.50?V(vs.SCE) and its saturation coverage of Sbad is 0.34. Sb adatoms on Pt surface can adsorb oxygen at relatively low potentials, and exhibit catalytic effects for formic acid oxidation. In contrast to Pt electrodes, the oxidation peak current of formic acid in this case was five times increased. The EQCM studies provided quantitative results of surface mass variation during formic acid oxidation, and have thrown new light in elucidating effects of adatom Sbad on Pt electrode surface towards formic acid oxidation.

关 键 词：EQCM PT电极 SB 甲酸 电催化氧化 

分 类 号：O646.54[理学—物理化学] O433[理学—化学]