ELECTROCHEMICAL AND ELECTRON SPECTROSCOPIC STUDIES OF HIGHLY POLISHED GLASSY-CARBON ELECTRODES
ELECTROCHEMICAL AND ELECTRON SPECTROSCOPIC STUDIES OF HIGHLY POLISHED GLASSY-CARBON ELECTRODES
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DOI：
10.1021/ac50001a049
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发表时间：
1985-01-01
影响因子：
7.4
通讯作者：
RUSLING, JF
中科院分区：
文献类型：
--
作者：
KAMAU, GN;WILLIS, WS;RUSLING, JF
通过连续使用粒径较小的碳化硅、金刚石膏和氧化铝进行高速抛光和超声波清洗，制备了玻碳电极，对铁氰化物、二茂铁、抗坏血酸盐、quiñones和catharanthlne的阳极氧化产生了可重复的活化。电子能谱分析表明，高度抛光的电极在20 ~ 30 nm处的氧含量高于块状材料或未活化的电极。氧的大部分可能与类酚基团有关。对于简单的电子转移，在电极上产生有利的电荷密度是激活的一个重要因素，但也可能涉及其他非特异性相互作用。对于质子偶联反应，如抗坏血酸和多巴胺的反应，反应物与表面上产生的催化基团的特定相互作用可能在电激活中起重要作用。电极的响应随着时间的推移而退化。
Preparation of glassy carbon electrodes by high-speed polishing with successively smaller particle size silicon carbide, diamond paste, and-alumlna, and ultrasonic cleaning, yielded reproducible activation for anodic oxidations of fer-rocyanide, ferrocene, ascorbate, quiñones, and catharanthlne. Electron spectroscopy showed that the highly polished electrodes had a higher oxygen content In the outer 20-30 nm than In the bulk material or In unactlvated electrodes. A major portion of the oxygen Is probably associated with phenolic-like groups. For simple electron transfers, creation of a favorable charge densityat the electrode Is an Important factor In the activation, but other nonspecific Interactions may also be Involved. For proton-coupled reactions, such as those of ascorbate and dopamine, specific Interactions of reactants with catalytic groups created on the surface may play a sig-nificant role In electrqde activation. Response of the electrodes degraded with time.