Mass transfer phenomena induced by surface gas flow rate in the hanging meniscus configuration: A case study of the methanol electro-oxidation reaction on Pt(100)

The study of electrochemical systems using single-crystal electrodes under conditions that allow the occurrence an oscillatory response can be a valuable tool to obtain proper correlation between structure, composition, and electrocatalytic activity. Measurements with are usually performed in hanging meniscus configuration, so, it is essential understand impact different experimental parameters on response, mainly regime, which very sensitive environment. In this study, we investigated influence surface gas flow rate, commonly used avoid contribution oxygen reduction reaction methanol electro-oxidation Pt(100) electrodes. Controlled experiments were conducted analyze effect parameter behavior chronoamperometric, voltammetric, responses. results show while chronoamperometric voltammetric profiles remain relatively unaffected by varying rates, undergoes significant changes. induction period, existence region potential oscillations, transition patterns notably influenced. observed effects suggest subtle agitation caused increased rate enhances mass transfer phenomena near electrode surface, impacting presence soluble species their role behavior. addition, mixed-mode oscillations attributed periodic re-establishment concentration double layer. findings highlight importance controlling ensure reliable reproducible configuration.