Screening process for activity determination of conductive oxide electrodes for organic oxidation

Journal of the Brazilian Chemical Society

Universidade de São Paulo, São Carlos, Brazil¹  Malpass, Geoffroy R. P.¹  Motheo, Artur J.¹ 

关键词: DSA®;    aldehydes;    oxidation;    normalized faradaic charge;   

DOI  :  10.1590/S0103-50532008000400010

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

A modified method for the calculation of the normalized faradaic charge (qfN) is proposed. The method involves the simulation of an oxidation process, by cyclic voltammetry, by employing potentials in the oxygen evolution reaction region. The method is applicable to organic species whose oxidation is not manifested by a defined oxidation peak at conductive oxide electrodes. The variation of qfN for electrodes of nominal composition Ti/RuXSn1-XO2 (x = 0.3, 0.2 and 0.1), Ti/Ir0.3Ti0.7O2 and Ti/Ru0.3Ti0.7O2 in the presence of various concentrations of formaldehyde was analyzed. It was observed that electrodes containing SnO2 are the most active for formaldehyde oxidation. Subsequently, in order to test the validity of the proposed model, galvanostatic electrolyses (40 mA cm-2) of two different formaldehyde concentrations (0.10 and 0.01 mol dm-3) were performed. The results are in agreement with the proposed model and indicate that this new method can be used to determine the relative activity of conductive oxide electrodes. In agreement with previous studies, it can be concluded that not only the nature of the electrode material, but also the organic species in solution and its concentration are important factors to be considered in the oxidation of organic compounds.

【 授权许可】

Unknown