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고온 수전해 전극용 modified Ni/YSZ cermet 제조 및 전극특성
채의석,홍현선,추수태,윤용승,박근만 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.2
Modified Ni/YSZ cermets for high temperature electrolysis were synthesized by dry or wet mechanical alloying methods. The Ni/YSZ composit particle was directly fabricated from the ball milling of Ni and YSZ powder or obtained from the reduction of NiO/YSZ particle after the ball milling of NiO and YSZ. In the case of the NiO/YSZ composite particle, the dry milling increased the average particle size whereas the wet milling decreased the size. The dry milling showed that fine YSZ particles were distributed over large Ni surfaces while Ni and YSZ particles similar in size were well mixed in the wet milling method. These features were the same in the Ni/YSZ composite particle prepared from Ni and YSZ powders. The electrical conductivity of the wet-milled Ni/YSZ cermet showed the highest value of 2×102 S/cm among the specimens and this value was increased to 1.4×104 S/cm after the sintering at 900 ℃ for 1 h.
Mechanical Alloying Method로 제조된 고온수전해용 Ni/YSZ cermet의 제조 및 특성
채의석,홍현선,추수태 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.4
Ni/YSZ (Y2O3-stabilized ZrO2) composite powder for a cathode material in high temperature electrolysis(HTE) was synthesized by a mechanical alloying method with Ni and YSZ powder. Microstructure of the composite and cell thickness for HTE reaction has been analyzed with various techniques of XRD, SEM to investigate effects of fabrication conditions. Employing the composite material , furthermore, the unit cell for HTE has been studied to evolve hydrogen from water. XRD patterns showed that the composites after wet mechanical alloying were composed of respective nano-sized crystalline Ni and YSZ. While ethanol as additive for mechanical alloying increased to 20 ㎛ of average particle size of the composites, alpha-terpineol effectively decreased to sub-micro size of that. This study has been found out the evolution of hydrogen by HTE reaction employing the fabricated cathode material, showing 1.4 ml/min of H2 generation rate as increasing 20 ㎛ of cathode thickness.