Univ. Bordeaux, Bordeaux INP, CNRS, ISM, UMR 5255, F-33400 Talence, France.
Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM UMR 5254, 64600 Anglet, France.
Bioelectrochemistry. 2023 Dec;154:108551. doi: 10.1016/j.bioelechem.2023.108551. Epub 2023 Aug 28.
Glassy carbon (GC) electrodes are widely used in electroanalytical applications especially in bioelectrochemistry. Their use starts with an efficient surface cleaning and activation protocol, mostly based on surface polishing steps. We studied the use of an oxygen plasma exposure of GC electrodes to replace common polishing procedures. The cyclic voltammetry (CV) responses of ferrocyanide and ferrocene-dimethanol were used to compare brand new, surface-polished and plasma-treated GC electrodes. Plasma treatment induces CV responses with improved features, close to theoretical values, as compared to other methods. The plasma effects were quasi-stable over a week when electrodes were stored in water, this being explained by increased surface energy and hydrophilicity. Furthermore, when electroreduction of diazonium was performed on GC electrodes, the surface blockade could be removed by the plasma. Thus, a short oxygen plasma treatment is prone to replace polishing protocols, that display person-dependent efficiency, in most of the experiments with GC electrodes.
玻碳电极在电分析应用中被广泛应用，尤其是在生物电化学中。它们的使用始于一个高效的表面清洁和激活方案，主要基于表面抛光步骤。我们研究了使用氧等离子体暴露来替代常见的抛光程序。循环伏安法（CV）响应的亚铁氰化物和二茂铁-二甲醇被用来比较全新的、经过表面抛光和等离子体处理的玻碳电极。与其他方法相比，等离子体处理会诱导出具有改进特征、接近理论值的 CV 响应。当电极储存在水中时，等离子体的影响在一周内几乎是稳定的，这可以通过增加表面能和亲水性来解释。此外，当在 GC 电极上进行重氮还原时，表面阻塞可以通过等离子体去除。因此，短时间的氧气等离子体处理很容易替代那些显示出因人而异的效率的抛光方案，在大多数使用 GC 电极的实验中。
