Cu掺杂SmBaCo_2O_(5+δ)作为中温固体氧化物燃料电池阴极材料的研究

Research on Cu-doped SmBaCo_2O_(5+δ) Cathode Materials for Intermediate Temperature Solid Oxide Fuel Cell

采用EDTA-甘氨酸法制备了SmBaCo_(2-x)Cu_xO_(5+δ)(SBCC_x,x=0,0.5,1.0,1.5,2.0)阴极材料,研究不同Cu掺杂量对SBCC_x材料的晶体结构、热膨胀系数、电导率及电化学性能的影响。结果表明,在SmBaCo_2O_(5+δ)阴极材料的Co位掺入Cu,材料的晶胞体积逐渐变大,热膨胀系数将随着Cu的加入而逐渐降低,与Sm_(0.2)Ce_(0.8)O_(1.9)(SDC)电解质热匹配性良好。以SBCC1.0为阴极,SDC为电解质,N-SDC为阳极支撑的单电池在750℃时输出功率达到346 mW·cm^2,这得益于SBCC1.0在750℃时电导率值为133S·cm^1和较小的极化电阻0.154Ω·cm^2。

SmBaCo_2-xCu_xO_5＋δ（SBCC_x,x =0,0.5,1.0,1.5,2.0） cathode powders were prepared by an EDTAglycine method.The influence of different Cu doping contents on the crystal structure,thermal expansion,electrical conductivity and electrochemical property of SBCC_x materials were studied.The results showed that with the increasing of Cu amount,the unit cell volumes of SBCC_x became larger,and their coefficient of thermal expansion got smaller,which made those cathode materials thermally match with the Sm_0.2Ce_0.8O_1.9（SDC） electrolyte.The power output of Ni-SDC anode-supported fuel cell with SBCC1.0 as cathode and SDC as electrolyte was measured,and the max value was obtained to be 346 mW·cm-（-2） at 750°C when fed with humidified H_2 at the anode side.This satisfied result was attributed to its electrical conductivity of 133 S·cm^-1 and the small electrode polarization resistance of 0.154Ω·cm-2for SBCC1.0 cathode at 750 °C.