A spectroelectrochemistry device capable of studying different regions of an electrode surface simultaneously is presented in this work. It is based on two reflection probes placed in a near-normal arrangement with respect to an electrode surface, part of which has been deliberately modified. As expected, the electrochemical signal contains information related to the whole system, it being impossible to distinguish which behaviour corresponds to the unmodified and which to the modified part of the electrode. Spectroelectrochemistry provides an excellent solution because the reflection probes fully explain the electrochemical response, allowing deconvolution of the electrochemical behaviour from an optical point of view under exactly the same experimental conditions. To demonstrate the usefulness of this platform, a highly oriented pyrolytic graphite electrode is partially modified with commercially available carbon nanotubes or graphene, and the oxidation of dopamine at different parts of the electrode is studied simultaneously. A remarkable decrease in the onset oxidation potential is observed at the modified surfaces compared to the bare electrode. This work highlights the advantages of spectroelectrochemistry for the characterization of materials and the comparison of electrode surfaces, laying the groundwork for novel experiments in which simultaneous measurement is a key factor.

在这项工作中提出了一种能够同时研究电极表面不同区域的光谱电化学装置。它基于相对于电极表面以接近法线布置的两个反射探针，已对其中的一部分进行了有意修改。如所期望的，电化学信号包含与整个系统有关的信息，不可能区分哪个行为对应于电极的未修饰部分，哪个对应于电极的修饰部分。光谱电化学提供了一个很好的解决方案，因为反射探针完全可以解释电化学反应，从而可以在完全相同的实验条件下从光学角度对电化学行为进行反卷积。为了展示该平台的实用性，用市售的碳纳米管或石墨烯对高度取向的热解石墨电极进行了部分修饰，并且同时研究了多巴胺在电极不同部位的氧化。与裸电极相比，在改性表面上观察到起始氧化电位的显着降低。这项工作凸显了光谱电化学在材料表征和电极表面比较方面的优势，为同时进行测量是关键因素的新型实验奠定了基础。与裸电极相比，在改性表面上观察到起始氧化电位的显着降低。这项工作凸显了光谱电化学在材料表征和电极表面比较方面的优势，为同时进行测量是关键因素的新型实验奠定了基础。与裸电极相比，在改性表面上观察到起始氧化电位的显着降低。这项工作凸显了光谱电化学在材料表征和电极表面比较方面的优势，为同时进行测量是关键因素的新型实验奠定了基础。