4种有机小分子伯醇在Pt电极上吸附和氧化的比较研究  

The Study on the Electrooxidatian of C1 to C4 Primary Alcohols in Acidic Media on Pt Electrodes

作　　者：陈国良[1] 林珩[1] 卢江红[1] 林进妹[1] 林秀梅[1] 陈燕鑫[1] 

机构地区：[1]漳州师范学院化学系,福建漳州363000

出　　处：《漳州师范学院学报（自然科学版）》2004年第4期71-74,共4页Journal of ZhangZhou Teachers College（Natural Science)

摘　　要：用电化学循环伏安研究了酸性介质中4种有机小分子伯醇(甲醇、乙醇、正丙醇和正丁醇)在Pt电极上吸附和氧化过程．结果表明：这些伯醇电氧化反应活性的顺序为：甲醇、乙醇、正丙醇、正丁醇；在-0．25V至0．1V的氢吸脱附电位区间，伯醇或其解离产物都会吸附在电极表面并且抑制氢吸脱附：酸性介质中伯醇在Pt电极上的CV曲线都有两个正向氧化峰，但峰值大小随着分子结构不同而改变；伯醇的氧化与Pt表面生成不同氧物种密切相关；伯醇的氧化要有表面吸附氧物种参与；在0．18-0．48V电位区间内，负向电位扫描中伯醇的氧化电流明显比正向电位扫描的大，说明这些伯醇的电氧化中都存在自毒化现象．The processes of adsorption and oxidation of C1 to C4 primary alcohols (methanol,ethanol,propanol,1-butanol) in acid media on Pt electrode were studied by using cyclic voltammetry. The results demonstrated that in the hydrogen adsorption and desorption potential range between –0.25 and 0.1V primary alcohols and their dissociative adsorbates(DA) can adsorb to the surface of the electrode and then inhabit the adsorption and desorption of the hydrogen. There are two positive-going oxidation peaks in primary alcohols’ CV curve in acid media on Pt electrode, but the value of peaks varies with the molecular structure. The primary alcohol oxidation depends strongly on oxidation states of electrode surface; Furthermore, the oxygen species adsorbed on the electrode surface must participate in this process. In the potential range between 0.18 and 0.46V, the oxidation current density is obviously higher in the NGPS than in the PGPS. The above phenomenon suggests that there is self-poisoning in primary alcohol electro-oxidation.

关 键 词：PT电极 电氧化 解离 正丙醇 电位 循环伏安 有机小分子 伯醇 改变 乙醇 

分 类 号：O646[理学—物理化学] R914.4[理学—化学]