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Voltage-Current Profiles of Hydrogen-Oxygen Mixture Gas at Polymer Electrolyte Interface
차석렬(Suk Yeul Cha),송정민(Jung Min Song),이웅무(Woong Moo Lee) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.2
Voltage-current profiles are measured when hydrogen-oxygen gas is in contact with solid polymer membrane (Nafion<sup>®</sup>) as the electrolyte. The feed gas is prepared by mixing hydrogen and oxygen gas in various ratios. The carbon gas diffusion electrodes contacting the electrolyte are treated by platinum catalyst. The platinum surface is impregnated with a 5% Nafion<sup>®</sup> solution to ensure its good surface contact with the electrolyte. The constant voltage between anode and cathode was applied by a DC power supply. The results on the profiles show that the energy efficiency critically depends on the hydrogen concentration in H₂/O₂ mixture gas.
Voltage - Current Characteristics of Electrical Discharge Method for Hydrogen Generation
최용만(G . J . Kang),강구진(S . Y . Cha),차석렬(W . M . Lee),이웅무 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.1
Hydrogen generation by electrical discharge through metal/water system is a viable method for on-demand applications. But its success depends on high energy efficiency defined as the ratio of the amount of consumed metal for a complete reaction with water to the electrical energy input. To improve the energy efficiency the electrical discharge has to sustain the hydrogen generation reaction with a minimal energy dissipation. Some experimental results on the discharge voltage-current profiles are reported and discussed.
오인환,임태원,최형준,조성아,이정규,하흥용,심중표,홍성안,차석렬,안상열 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.4
전극 유효면적이 200㎠인 단위전지를 39단 적층하여 향류흐름형 스택을 제작하고 이에 대한 운전특성을 조사하였다. 작동압력 1기압, 작동온도 75℃의 조건 하에서 반응기체로 수소/산소를 사용하였을 경우의 최대출력은 3.94 ㎾(0.51 W/㎠/cell)이었으며 수소/공기를 사용하였을 경우는 2.53㎾(0.32 W/㎠/cell)였다. 스택 내의 각 단위전지들에 대한 전압손실 요인을 분석한 결과 전압손실은 주로 전극의 분극저항 때문인 것으로 나타났다. 단위전지들 간에 일부 불균일한 성능분포 및 온도분포가 관찰되었으나 90시간 이상의 연속운전이 가능하였다. A counter-flow type 39-cell proton exchange membrane fuel cell(PEMFC) stack with an effective electrode area of 200 ㎠ has been assembled and its operational characteristics were investigated. Under the condition of atmospheric pressure and 75 ℃, the maximum power of the stack was 3.94 ㎾(0.51 W/㎠/cell) and 2.53 ㎾(0.32 W/㎠/cell) for H₂/O₂ and H₂/air, respectively. The analysis of the factors causing voltage losses revealed that polarization resistance of the electrodes was the main reason. Although ununiform distribution in voltage and temperature of the unit cells was observed, the continuous operation of the stack beyond 90 hours was possible.