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

发布时间：2018-07-17 06:22

【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。
[Abstract]:CaZr _ (0.9) in _ (0.1) O _ (3- 伪) high temperature proton conductor materials were synthesized by solid state reaction and solid electrolyte tubes were prepared. The effects of different reference hydrogen partial pressure on the measurement error of EMF and the calculation error of terminal hydrogen partial pressure were studied by assembling two kinds of hydrogen sensors of concentration difference cell. The results show that the larger the difference between the reference hydrogen partial pressure and the measured terminal hydrogen partial pressure is in the range of 0.005 ~ 0. 1 atm (1 atm=1.013'105 Pa), the larger the relative error of the EMF is, especially at 873 K. The error of calculating the terminal hydrogen partial pressure based on Nernst's law is greatly dependent on the ratio of the reference end to the measured terminal hydrogen partial pressure. The error can be eliminated by replacing the measured terminal hydrogen partial pressure with the reference hydrogen partial pressure of 00:00 electromotive force. Using this method, the formation enthalpy and entropy of formation of zirconium hydride in the coexistence region of 尾 -ZrH-tix and 未 -ZrH _ x in the two-phase coexisting region and the formation enthalpy and entropy of formation in the two-phase transition were determined at 873H _ (1073) K.
【作者单位】：华中科技大学材料成形与模具技术国家重点实验室;
【基金】：国家自然科学基金(51574129)~~
【分类号】：O646;TP212

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