作者：Assabumrungrat, S.;Charojrochkul, S.;Sansernnivet, M.;Laosiripojana, N.;
作者單位：Department of Chemical Engineering, Chulalongkorn University, Bangkok, Thailand;National Metal and Materials Technology Center, Pathumthani, Thailand;Joint Graduate School of Energy and Environment, KMUTT, Bangkok, Thailand;Joint Graduate School of Energy
刊名：Chemical vapor deposition
ISSN：0948-1907
出版年：2010-01-05
卷：16
期：41194
起頁：311
止頁：321
分類號：TQ175
語種：英文
關(guān)鍵詞：FAVD;Lanthanum chromite (La_(0.8)Sr_(0.2)CrO_3);Methane steam reforming;Perovskite;Solid oxide fuel cells;
內(nèi)容簡介Flame-assisted vapor deposition (FAVD) has a principle similar to conventional CVD in which a film is deposited from a vapor phase. It is a simple and cost-effective technique as it is operated in an open atmosphere. The microstructure of the deposited films is controlled by varying the processing parameters. In our research, an oxide film of lanthanum chromite perovskite-based (La_(0.8)Sr_(0.2)CrO_3) material is fabricated, using the FAVD technique, on a stainless steel substrate (SS430) for an application in solid oxide fuel cells (SOFC). The precursor solution for La_(0.8)Sr_(0.2)CrO_3 film is prepared from metal nitrate compounds with a concentration in the range 0.0125a-a0. 0500aM. Dense and porous films are fabricated, depending on various processing parameters such as fuel to water ratio, air pressure, flow rate of a precursor, and the distance between the spray nozzle and the substrate. The effect of various processing parameters on the microstructure and phase formation of the deposited film are investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The deposition temperature resulting from the total heat of combustion from the combination of all the deposition parameters is very important in determining the properties of the films. According to the SEM images, a small particle size on the nanometer scale is found at high deposition temperature. On the other hand, the particles are connected into a dense film at low deposition temperatures. The main phase of LaCrO_3 is found in all deposition temperatures (temp range). For hydrogen production, the methane steam reforming over the porous film of La _(0.8)Sr_(0.2)CrO_3 at 900a°C is investigated. Under specific operating conditions (low inlet H _2O/CH_4 ratio), its catalytic reactivity is comparable to metallic-based catalysts but with less inlet steam required. Dense and porous La_(0.8)Sr_(0.2)CrO_3 films for use in Solid Oxide Fuel Cells are fabricated on stainless steel using a flame-assisted CVD route, starting from a solution of the corresponding metal nitrates. The interrelations between the processing parameters and the film morphology and microstructure are investigated by SEM and XRD. The functional properties of the obtained systems in H_2 production by methane steam reforming are also presented and discussed.
所需耐材幣：0
