参比氢分压对固体电解质浓差电池氢传感器测试准确性的影响  

Reference Hydrogen Partial Pressure on Accurancy of Hydrogen Determination Utilizing Concentration Cell Type Sensor Based on Solid State Electrolyte

作　　者：陈建勋[1] 吴树森[1] 张亚楠[1] 毛有武[1] 吕书林[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《无机材料学报》2017年第11期1195-1201,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(51574129)~~

摘　　要：采用固相反应法合成了CaZr_(0.9)In_(0.1)O_(3-α)高温质子导体材料并制备了固体电解质管。通过组装两类浓差电池氢传感器研究了不同参比氢分压对电动势测量误差和待测端氢分压计算误差的影响。结果表明,在873~1073 K,且待测端氢分压在0.005~0.1 atm(1 atm=1.013′105 Pa)范围内,参比端氢分压与测试端氢分压相差越大,所测电动势相对误差越大,尤其在873 K低温下更明显。根据Nernst定律计算待测端氢分压的计算误差极大依赖于参比端与待测端氢分压的比值。该误差可通过用电动势为零时的参比氢分压代替测试端氢分压的方法加以消除。利用该方法测定出在873~1073 K,氢化锆在β-ZrH-_x和δ-ZrH_x两相共存区的平台氢分压以及两相转变过程中的生成焓和生成熵。High temperature proton conductor CaZr_（0.9）In_（0.1）O_（3-α） powders were prepared. By using the prepared powders, solid state electrolyte tubes were prepared. After assembling two types of concentration cell type hydrogen sensors, the effects of reference hydrogen partial pressures on electromotive force errors and hydrogen partial pressure calculation errors were investigated. At temperatures ranging from 873-1073 K and in the hydrogen partial pressure range of 0.005-0.1 atm（1 atm=1.013′105 Pa）, the relative errors of electromotive forces increase when the hydrogen partial pressure difference between reference and measurement sides enlarged. This phenomenon is more obvious at low temperature of 873 K. The calculation error of the hydrogen partial-pressure according to the Nernst law is greatly dependent on hydrogen pressure ratio of the two sides of the cell. This error can be eliminated through reference hydrogen partial pressure at electromotive force of zero instead of hydrogen partial pressure. Hydrogen pressures platforms of β-ZrH_x and δ-ZrH_x coexistence zone were calculated by this method, as well as the formation enthalpy and formation entropy in the phases conversion process.

关 键 词：固体电解质 高温质子导体 Nernst定律 氢分压 CA Zr0.9In0.1O3-α 

分 类 号：TB321[一般工业技术—材料科学与工程]