天然气和甲烷固体氧化物燃料电池中的Ni-LCCM-GDC阳极性能研究

采用溶胶-凝胶法合成了纳米粉体La_1-xCe_xCr_0.5Mn_0.5O_3-δ(x=0.05，0.10，0.15，0.20)(LCCM)，并采用共压-共烧结法制备了以复合阳极Ni-La_0.9Ce_0.1Cr_0.5Mn_0.5O_3-δ-Ce_0.8Gd_0.2O_2-δ(GDC)为支撑、GDC为电解质、La_0.8Sr_0.2Co_0.8Fe_0.2O_3-δ(LSCF)-GDC为复合阴极的单电池。利用XRD和SEM等方法对阳极材料进行了晶相结构、化学相容性、微观形貌分析。在500~750 ℃范围内，分别以湿天然气(3% H₂O)和甲烷为燃料气，氧气为氧化气测试了单电池的电化学性能，同时检测了以甲烷为燃料气的阳极尾气组成。结果表明：复合阳极材料具有良好的化学相容性；阳极和阴极具有较好的孔隙结构。以天然气和甲烷为燃料气的单电池在700 ℃时最大电流密度分别为131.96 mA·cm^-2，162.36 mA·cm^-2； 最大比功率分别为28.61 mW·cm^-2，31.03 mW·cm^-2。在500~750 ℃范围内阳极尾气中均检测出CO，CO₂，在700 ℃时CO，CO₂含量达到最大值，分别为2.39254%，6.20891%。

Performance of the Ni-LCCM-GDC Anode for Solid Oxide Fuel Cells in Natural Gas and Methane

The article carried out the Sol-Gel Method to synthesize La1-xCexCr0.5Mn0.5O3-δ(x=0.05,0.10,0.15,0.20)(LCCM)nanopowders.The Ni-La1-xCexCr0.5Mn0.5O3-δ-Ce0.8Gd0.2O2-δ(GDC)anode-supported cells were fabricated by dry-pressing process using GDC as electrolyte and La0.8Sr0.2Co0.8Fe0.2O3-δ(LSCF)-GDC as cathode.The crystal forms,chemical stability and microstructures were investigated by XRD and SEM.The electrical properties of single cell were tested by using humidified natural gas (3%H2O) and methane as fuel respectively,oxygen as oxidant in the temperature range from 500 ℃=to 750℃.We also detected the composition of anode tail gas by using methane.The results show that the composite anode have good chemical compatibility,anode and cathode have the better pore microstructure. At 700 ℃, the maximum power density is 28.61 mW·cm-2 for humidified nature gas, 31.03 mW·cm-2 for methane. Carbon monoxide (CO) and carbon dioxide (CO2) were detected in the anode tail gas at 500-750 ℃. The maximum contents of CO and CO2 are 2.392 54%, 6.20891% at 700 ℃, respectively.