서울시립대학교 <발표와 토론> 수업 운영에대한 사례보고

Man-Yoep Park
2008 Ratio et Oratio  
요 약 본 연구에서는 Graphite Felt (GF) 전극의 표면에 산소와 질소의 도핑을 통하여 전기화학적 특성을 개선하고, 이의 촉매화학 적 효과를 바나듐 레독스 흐름전지의 양극과 음극의 특성비교를 통하여 관찰하였다. 탄소전극 표면의 산소와 질소 동시 도 핑은 GF 샘플을 773 K에서 암모니아-공기 (NH3 = 50%, O2 = 10%) 혼합가스에 노출시켜 Chemical Vapor Deposition (CVD) 방법으로 제조하였다. 이러한 산소-질소 동시 도핑의 전기화학적 효과는 산소만으로 도핑 처리된 GF 샘플과 비교하여 분 석, 평가하였다. 탄소전극 샘플들의 표면 구조와 화학적 조성은 Scanning Electron Microscopy (SEM)와 X-ray Photoelectron Abstract : In this study, we investigated the electrocatalytic effects of the N and O co-doping of
more » ... Felt (GF) electrode for the vanadium redox flow battery (VRFB) at the cathode and the anode reaction, respectively. The electrodes were prepared by chemical vapor deposition (CVD) with NH3-O2 at 773 K, and its effects were compared with an electrode prepared by an O doping treatment. The surface morphology and chemical composition of the electrodes were characterized by scanning electron microscopy (SEM) and photoelectron spectroscopy (XPS). The electrocatalytic properties of these electrodes were characterized in a VRFB single cell comparing the efficiencies and performance of the electrodes at the cathode, anode, and single cell level. The results exhibited about 2% higher voltage and energy efficiencies on the N-O-GF than the O-GF electrode. It was found that the N and O co-doping was particularly effective in the enhancement of the reduction-oxidation reaction at the anode.
doi:10.19042/kstc.2008.1.1.183 fatcat:ruxrxmenp5hl5eywlvmjw5luhq