Abstract
To understand the influence of bubble generation on electrochemical reaction in microchannel reactor, visualized experimental research was carried out to analyze the bubble growth and detachment behaviors on needle electrode and investigate the voltage–time diagrams of a typical electrochemical oxidation and hydrogen evolution reaction. Two kinds of gas–liquid flow patterns were observed in the microchannel reactor, which caused different current fluctuations in the linear sweep voltammetry experiment. Quickly bubble rupturing was important for maintaining stable electrochemical reaction by avoiding the block of ionic conduction between electrodes. The voltage fluctuation caused by periodic growth and detachment of bubble on the needle electrode clearly exhibited the variation of electrochemical reaction process. The diameter of the bubble shear-ruptured from the electrode was exponential with the capillary number of electrolyte solution, and the relative diameter of bubble and electrode was linear with the relative voltage fluctuation. The voltage fluctuation was mainly contributed by the bubble induced activation and ohmic overpotentials, which ratios were almost 50% respectively.
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