| Summary: | 碩士 === 國立聯合大學 === 能源工程學系碩士班 === 103 === In this study, a new surface modification electrode and its associated fabrication method were developed for metal-air battery (MAB). This electrode is the air-side electrode of MAB during charge where oxygen evolution reaction (OER) is taking place. The electrode surface was modified by electro-deposition method. Stainless steel (SS) mesh and nickel plate were used as the substrate. Laser abrasion technique was used to cut out mini-holes through the insulating layer on the substrate. It was selectively electrodeposited nickel to produce an array of nickel dots. By electro-deposition at different amount of charge (total Coulombs), current density, or DC/pulse electrodeposition conditions, array of nickel dots with various surface morphology and electrochemical properties was studied. We found that it need proper amount of charge and current density to produce desired nickel dot. The properties of these electrodes with array of nickel dots was examined by cyclic voltammetry (CV), linear scanning voltage method (LSV), and electrochemical impedance spectroscopy (EIS) techniques. Results show that at low current density region (5 mA/cm2), nickel metal dots does can effectively reduce the over-potential of OER. In the high current density region (50 mA/cm2), bubbles were accumulated on the electrode. These bubbles can rapidly remove from the electrode surface by flushing with flowing electrolyte, the over-potential of OER can be reduced. This surface modification method and process was experimental verified. It is feasible and can effective reduce the electrode potential of the electrochemical reaction of oxygen evolution.
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