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탄소펠트의 산화처리 방법이 바나듐 레독스 흐름 전지의 전극 성능에 미치는 영향
하달용,김상경,정두환,임성엽,백동현,이병록,이관영,Ha, Dal-Yong,Kim, Sang-Kyung,Jung, Doo-Hwan,Lim, Seong-Yop,Peck, Dong-Hyun,Lee, Byung-Rok,Lee, Kwan-Young 한국전기화학회 2009 한국전기화학회지 Vol.12 No.3
레독스 흐름 전지의 전극으로 사용하기 위해 탄소펠트를 열처리와 산처리 방법으로 산화 개질하였다. 열중량 분석결과 열처리 또는 산처리에 의하여 탄소펠트의 섬유 표면에 고분자 물질이 제거되고 산소 관능기가 도입된 것을 확인할 수 있었으며 습식 방법인 산처리 방법보다 건식방법인 열처리 방법이 기계적 안정성을 유지하는데 효과적인 처리 방법으로 나타났다. XPS, 원소분석을 통하여 500$^{\circ}C$에서 4시간 열처리한 탄소펠트의 표면에 산소 관능기가 부가된 것을 확인하였으며 질소흡착실험에서 거의 없던 표면적이 96 $m^2/g$로 증가한 것을 알 수 있었다. CV실험 및 분극 실험을 수행한 결과 500$^{\circ}C$ 열처리 전극의 활성화 저항이 가장 낮게 나타났다. 산처리한 탄소펠트와 400$^{\circ}C$, 500$^{\circ}C$에서 열처리한 탄소펠트를 이용하여 바나듐 레독스 흐름 전지를 구성하고 충/방전 실험을 실시한 결과 충/방전 전압효율이 산처리 전극의 경우 86.6%, 400$^{\circ}C$ 열처리 전극의 경우 89.6%, 500$^{\circ}C$ 열처리 전극의 경우 90.6%로 500$^{\circ}C$ 열처리 전극이 가장 우수하였다. Carbon felt surface was modified by heat or acid treatment in order to use for the electrode of a redox-flow battery. Polymers on the surface of carbon felt was removed and oxygen-containing functional group was attached after the thermal treatment of carbon felt. Thermal treatment was better for the stability of the carbon structure than the acid treatment. Oxygen-containing functional group on the thermally treated carbon felt at 500$^{\circ}C$ was confirmed by XPS and elementary analysis. BET surface area was increased from nearly zero to 96 $m^2/g$. Thermally treated carbon felt at 500$^{\circ}C$ showed lower activation polarization than the thermally treated carbon felt at 400$^{\circ}C$ and the acid-treated carbon felt in the cyclicvoltammetry and polarization experiments. The thermally treated carbon felts at 400$^{\circ}C$ and 500$^{\circ}C$ and the acid-treated carbon felt was applied for the electrode to prepare vanadium redox flow battery. Voltage efficiencies of charge/discharge were 86.6%, 89.6%, and 96.9% for the thermally treated carbon felts at 400$^{\circ}C$ and 500$^{\circ}C$ and the acid-treated carbon felt, respectively.
Study on the settling rate of As_2S_3 sol in gelatine solution
Kim, Byung Kyu,Ha, Dal Yong 成均館大學校 1972 論文集 Vol.17 No.-
It is not yet enough to explained for the system with organics then, I will summarized as define in gelatine. (1) When coagulation agent used, a AI_2(SO_4)_3 alone, it is more effect other than. (2) In gelatine added to the system, it did not almost appear the ion-antigonism, but, settling velocity decreases. (3) In any dilute range of gelatine, especially the sensitisation phenomena is occured. (4) In very dilute range of gelatin, it does not almost depend on gelatine.
金昺圭,河達容 成均館大學校 1973 論文集 Vol.18 No.-
From above report, it was investgated the coagulation phenomena of As_2S_3(hydrophobic sol) to agar agar (hydrophilic sol) Thus, the coagulation value of agar agar by sensitization phenomena is 3×10^-3% (wt.). When agar agar and Al_2(So_4)_3 were added to the dispersion system of As_2S_3, hence, the range of coaglation agents will be taken the nearest one-half to the coaglation value respectively because it will appear Ionic-antagonism Phenomena. In this experiment, we found that coaglation power of Vander-Waal's force is very weaker than that of Coulomb's force and gelatine.