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정전분무법을 이용한 직접개미산 연료전지 전극촉매의 효율적인 분산
권병완,김진수,권용재,한종희,Kwon, Byeong-Wan,Kim, Jin-Soo,Kwon, Yong-Chai,Han, Jong-Hee 한국전기화학회 2008 한국전기화학회지 Vol.11 No.4
직접개미산 연료전지의 전극 촉매로 사용되는 귀금속 백금-루테늄 촉매를 정전분무법을 이용하여 효율적으로 분산하여 보았다. 전극에 도포된 촉매 양은 분사 시간에 따라 증가하였으나, 분사시간이 80분을 넘는 경우 촉매 응집으로 인하여 연료전지 성능은 감소하는 경향을 보였다. 상용 핸드스프레이로 전극 촉매를 $3.0\;mg/cm^2$ 분산한 경우 얻은 최대 출력밀도 $74\;mW/cm^2$와 비교하여 정전분무법은 적은 양인 $1.85\;mg/cm^2$의 촉매를 분산하고도 $72\;mW/cm^2$의 최대 출력밀도를 얻을 수 있었다. Effective dispersion of noble metal Pt-Ru catalysts was conducted for the application of direct formic acid fuel cell(DFAFC) electrodes by electrospray method. The amount of catalysts deposited on the electrodes increased with increasing deposition time. However, the performance of cell test decreased with the deposition time after 80 min. because of agglomeration of catalysts. With the conventional hand-spray method, the density of the anode catalysts deposited was $3.0\;mg/cm^2$ and the maximum power density of the MEA was $74\;mW/cm^2$. On the other hand, the MEA prepared by the electrospray method, showed a similar power density of $72\;mW/cm^2$. However, the density of the anode catalysts deposited was much lower than the case of the hand-spray and the density the anode catalysts in this case was $1.85\;mg/cm^2$.
주천호,권병완,이원미,권용재 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
Carboxylic acid functionalized alloxazine (alloxazine-COOH) and ferrocyanide are utilized as active species for aqueous redox flow battery (ARFB), and the effect of operating temperature on the performance of ARFB was investigated. Based on electrochemical characterization, although ferrocyanide is in a quasi-reversible state at room temperature, the state becomes irreversible as temperature increases. By the use of carbon felt (CF) containing carbonoxygen functional groups, the activity of ferrocyanide is enhanced without side effect, such as irreversible redox reactivity. This is because the hydrophilic (charge-dipole) interaction between dipole groups (hydroxyl and carbonyl groups) onto CF and ferricyanide ions promotes the oxidation reaction of ferricyanide. Though alloxazine-COOH coated on glassy carbon electrode shows irreversible state compared to ferrocyanide as temperature increases, the activity of alloxazine- COOH is also enhanced by using the hydrophilic group doped CF. To prove whether the redox reactivity of the two active species is improved with increase in temperature, the performance of ARFBs using them was evaluated in the different temperature conditions. When the temperature of both anolyte and catholyte is 45 oC, average discharge capacity and state of charge are 24 Ahr·L−1 and 90%, and the values are reduced to 23 Ahr·L−1 and 86% in ARFB of only catholyte heating, 22 Ahr·L−1 and 82% in ARFB of only anolyte heating and 21.3 Ahr·L−1 and 80% with no heating. Based on that, it is speculated that the operation temperature can be a factor in determining the performance of ARFB