【摘要】 在较低温度条件下,研究了以LaF3(掺杂)单晶或多晶为固体电解质,Sn,SnF2为参比电极,铂网为工作电极,构成的Sn,SnF2|LaF3(掺杂)|Pt(Ni)气体传感器·用该气体传感器分别测量了CO,CO2二种气体在体积分数5%～30%(以Ar为稀释气体)和温度293 15～343 15K条件下的EMF同CO,CO2气体体积分数、温度的关系,以及电池EMF达到平衡所需要的响应时间·由实验结果得出二种气体都表现出相似的规律性,即当温度一定,体积分数增加时,EMF随之增加;反之,当体积分数一定,而温度升高时,EMF随之增大;同一气体在相同的外部条件(体积分数、温度)下,单晶要比多晶的EMF高·二种气体的平衡响应时间大约在2～5min之间·更多还原

【Abstract】 A CO/CO₂ gas sensor was developed at low temperature, which is composed of Sn, SnF₂︱LaF₃（mixed）︱Pt （Ni）, i.e., taking LaF₃ （mixed） monocrystal or polycrystal as base material, Sn and SnF₂ as reference electrode and Pt wire mesh as working electrode. It was used to measure separately the two gases CO and CO₂ at 295.15～343.15K for the relationships of EMF to volumetric fraction and to temperature under conditions that volumetric fractions are in the range from 5% to 30%（with Ar taken as gaseous diluent）, as well as the response time need for equilibrium EMF the cell just reach. Experimental results show a similarity between both gases that the EMF of cell increases with the volumetric fraction at a fixed temperature and vise versa. In addition, the EMF value of monocrystal is higher than that of polycrystal for the same gas under the same conditions including volumetric fraction and temperature. The response time of both gases are about 2～5min.更多还原