펄스 전착법을 이용한 전기분해용 망간 산화물 전극의 제조 및 특성
Characteristics and Preparation of Manganese Oxide Electrode by Using Pulse Voltammetry Electrodeposition for Electrolysis
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초록
망간 산화물이 전착된 전기분해용 전극의 전기화학적 특성을 조사하기 위해 펄스 전위차 방법을이용하여 티타늄 망 표면에 망간 산화물을 전착하였다. 전착된 망간 산화물을 확인하기 위해EDX 분석과 SEM 분석을 실시하였다. 또한 제조된 전극의 EIS 측정을 실시하여 전기화학적특성을 관찰하였다. 티타늄 망에 펄스 1cycle의 인가 시간이 증가함에 따라 티타늄 망 표면에형성되는 망간 입자 크기는 증가 하였으며, 10 ms의 펄스 인가 시간에서 응집이 발생하여 약100 nm 크기의 망간 산화물 불균일 상이 형성되는 것을 SEM으로 관찰하였다. 다양한 조건으로제조한 전극들은 EIS 측정을 통해 과전위 부근에서 나타나는 전자이동저항(Rct, Charge transfer resistance)을 평가하였고, Tafel plot을 이용하여 제조된 전극이 갖는 과전위를 계산하여 전기분해용 전극으로서의 가능성을 모색하였다.
Abstract
In order to investigate the electrochemical propertied of titanium electrode for electrolysis,manganese oxide was electrodeposited on surface of mesh titanium by pulse voltammetry. The morphological changes and impedance results of manganese oxide electrodeposited electrode were analyzed by SEM and EDX. The size of electrodeposited manganese oxide on mesh titanium was increased with first cycle pulse time increase, and approximately 100 non-uniform manganese oxide was grown at 10 ms pulse polarization time. Charge transfer resistance(Rct) of near the overpotential was analyzed by EIS measurement and the feasibility of prepared electrode was evaluated by the overpotential calculated from Tafel plots.
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