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사마륨이 도핑된 세륨 옥사이드 나노 결정질 박막의 열처리 공정에 따른 표면 반응 특성 연구
양휘철(Hwichul Yang),배지웅(Jiwoong Bae),손종현(Jonghyun Son),구봉준(Bongjun Koo),김영범(Young-Beom Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Surface kinetics of samarium-doped ceria (SDC) thin film have been investigated. FE-SEM image analysis is conducted to discern the grain size effect and internal effect roughly by thermal annealing. Electrode resistance of SDC surface has been measured by electrochemical impedance spectroscopy (EIS). As a result, the electrode resistance becomes larger when the annealing temperature is increased.
스퍼터링 기법을 통해 증착된 저온형 고체 산화물 연료전지를 위한 YSZ 박막 전해질의 증착 온도에 따른 영향 분석
임용현(Yonghyun Lim),홍순욱(Soonwook Hong),배지웅(Jiwoong Bae),김영범(Young-Beom kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, deposition temperature effects on the crystallinity and grain morphology of sputtered yttria stabilized zirconia (YSZ) thin films have been studied. With various deposition temperature conditions, we investigated relationship between deposition temperature and crystallinity and grain morphology by X-ray diffraction (XRD) and Atomic force microscopy (AFM) respectively. With increasing deposition temperature, highly textured YSZ thin films were observed in the deposition temperature range of 500ºC. The high temperature deposited YSZ thin film electrolyte showed much higher ionic conductivity than low temperature deposited films due to influence of crystallinity in oxygen ion conduction. In respect of grain morphology, more significant changes are observed. The low temperature deposited films showed nano-granular morphology which favorable to Oxygen Reduction Reaction (ORR) for fuel cell kinetics, but the high temperature deposited film showed agglomeration of nano-grains result in comparatively few reaction sites and low cell performances. The electrochemical impedance spectroscopy (EIS) and fuel cell current-voltage behavior verified little effect of crystallinity in cell performance, but grain morphology affect more significantly in the cell performance. The low temperature deposited films showed much lower electrode impedance and higher fuel cell performance than high temperature deposited films result from difference in nano-granular morphology and grain boundary density.