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Electrochemical Activity of Modified Glassy Carbon Electrodes with Covalent Bonds Towards Molecular Oxygen Reduction

机译:具有共价键的修饰玻碳电极对分子氧还原的电化学活性

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The formation of covalent bonds on glassy carbon electrodes (GCEs) by producing oxidized functionalgroups (-COOH, -OH, -CHO, etc.) and using molecules such as 4-aminopyridine (4-AP), isonicotinicacid (IA) and 4-aminobenzoic acid (PABA) is proposed in this work with the aim of forming stablebonds. These modifications are done by using bulk electrolysis at an anodic fixed potential and by theKolbe reaction. Then, these modified systems are probed towards dioxygen reduction and it is seenthat the oxidized GCE is the most active system, while the GCE modified with PABA possesses thelowest activity towards the reduction of O2. By doing kinetic studies it was possible to calculate thetransferred electrons and the Tafel slope for the most active system. In this sense, this reaction implies-1 2 transferred electrons and the Tafel slope has a value of 68 mVdecade in the oxidized GCE. Finally,AFM studies were done in order to get information about the morphological behavior of these systemsin which each one presents different roughness (Rq values).
机译:通过产生氧化的官能团(-COOH,-OH,-CHO等)并使用诸如4-氨基吡啶(4-AP),异烟酸(IA)和4-等分子在玻璃碳电极(GCE)上形成共价键在这项工作中提出了氨基苯甲酸(PABA),目的是形成稳定的键。这些修饰是通过在阳极固定电势下使用本体电解并通过Kolbe反应完成的。然后,对这些修饰的体系进行了研究,以寻求还原双氧的方法,可以发现氧化的GCE是活性最高的体系,而用PABA修饰的GCE对O2还原的活性最低。通过进行动力学研究,可以计算出最活跃系统的转移电子和塔菲尔斜率。从这个意义上讲,该反应意味着有-1 2个转移电子,并且Tafel斜率在氧化的GCE中的值为68 mVdecade。最后,进行了原子力显微镜研究,以获取有关这些系统的形态行为的信息,其中每个系统呈现出不同的粗糙度(Rq值)。

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