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제125회 대한화학회 학술발표회 및 총회 Degradation of Oxygen Evolution Reaction Performances Due to the Interfacial Changes of Carbon and Titanium Based Materials

2020년 2월 14일 14시 36분 08초
ENVR.P-985 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
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Environmental Energy
저자 및
Hansaem Jang, Jaeyoung Lee*
School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Korea
Since the oxygen evolution reaction (OER) occurs at or near the surface, the interfacial behavior between the anode and the electrolyte can affect OER activity. Interfaces could exist between any of the two contacting surfaces of the following: electrolyte, catalyst, (if any) support, (if any) substrate, and electrode. The presence of the interface can reduce the OER activity by increasing the charge transfer resistance. Considering that C or Ti is typically used in anode, understanding the interfacial phenomena occurring on the surface of C or Ti may be the key to identifying the decrease in OER activity. In this regard, modelling experiments are conducted to reveal the influence of introducing C- or Ti-based materials. The interfacial phenomena on C surfaces during the OER are disclosed using various samples with different degrees of graphitization. This physicochemical property can be controlled using an appropriate heat treatment condition; in this regard, the effect of heat treatment conditions towards the physicochemical properties of C is studied. OER testing and ex-situ sample analyses reveal that C corrosion is one of the main reason that reduces the OER activity. This corrosion behavior is observed using several in-situ techniques during the OER. The interfacial phenomena on Ti surfaces during the OER are disclosed using various samples with different catalyst placement conditions. The electrochemical study using these samples reveals that Ti passivation can lead to the decrease in OER activity. Each modelling study shows that interfaces resulting from the use of C or Ti are the cause of degraded OER activity. Therefore, it is envisaged that this study can help optimize the OER activity by providing hints to minimize the interface-derived degradation.