短时间内Pt-SPE气敏电极上CO氧化电流的衰退研究Ⅰ.Pt表面氧化深度的影响  

STUDY ON CO OXIDATION CURRENT DECAY AT PT SPE GAS SENSING ELECTRODE IN SHORT TIME SCALE Ⅰ. Influence of Pt surface oxidation

作　　者：杨静[1] 严河清[1] 陆君涛[1] 

机构地区：[1]武汉大学化学系

出　　处：《武汉大学学报（自然科学版）》1997年第6期735-740,共6页Journal of Wuhan University(Natural Science Edition)

摘　　要：对短时间内Ｐｔ－ＳＰＥ气敏电极上ＣＯ氧化电流的衰退现象的研究表明，Ｐｔ表面无ＣＯ吸附态情况下，衰退主要与电极阳极极化后Ｐｔ表面氧化程度加深有关；采用动电势扫描法可使电极对ＣＯ氧化的催化活性基本恢复，但随着电极的进一步极化，衰退仍会继续．The current decay of CO oxidation at Pt SPE gas sensing electrode in short time scale has been studied. Results show that the decay is mainly due to the degree of Pt surface oxidation when the electrode was anodic polarized in the potential range without adsorbed CO. The catalytic activity of the electrode for CO oxidation can be restored through potentiodynamic technique. However, the decay still occurs at Pt SPE electrode after a period of anodic polarization.

关 键 词：SPE 铂 一氧化碳 气敏电极 氧化 催化活性 

分 类 号：O656.54[理学—分析化学] O613.71[理学—化学]