Studies on Electrochemical Hydrogen Gas Separation Using Proton Conducting Ceramics

本项目的目的是研究利用我们发现的一系列高温质子导电陶瓷来开发一种新的氢分离方法。以下是我们的研究结果。高温混合气体中氢的分离利用基于SrCeO_3的质子导电陶瓷作为固体电解质隔膜，从实验上证实了氢的电化学分离。该方法可用于从烃和氢的混合物中提取氢气。利用质子导电陶瓷试管制作了小型氢气分离器，成功地从硫化氢热解气体中提取了氢气。该分离器可用作氢气分压控制器。分离器用高温氢气传感器的研制利用质子导电陶瓷作为固体电解质，研制出了该类型分离器所必需的高温氢气传感器。研究了不同条件下的特性。质子在SrCeO_3基陶瓷中的行为研究用热脱附法系统地测定了不同条件下的质子浓度和迁移率，并对质子在氧化物中的行为进行了讨论。新型质子导体的合成BaCe&lt；1-x&gt；Sm_xO&lt；3-α&gt；陶瓷是一种高导电性的质子导体，一些CaZrO_3基陶瓷在高温下对CO_2是稳定的质子导体。

The aim of this project is to study on the development of a new hydrogen separation method using a series of high temperature proton conducting ceramics found by us. Followings are the results of our studies.1. Hydrogen Gas Separation from High Temperature Gas MixturesUsing proton conducting ceramics based on SrCeO_3 as a solid electrolyte diaphragm, electrochemical hydrogen separation has been confirmed experimentally. This method could be applied to hydrogen extraction from a gas mixture of hydrocarbons and hydrogen. A small scale hydrogen separator was fabricated by way of experiment using a tube of proton conducting ceramic, and hydrogen was successfully extracted from the thermally decomposed gas of hydrogen sulphide. This separator could be used as a controller of hydrogen partial pressure.2. Development of High Temperature Hydrogen Gas Sensor for SeparatorHigh temperature hydrogen sensors indispensable for this type of separator were developed using the proton conducting ceramics as a solid electrolyte. Characteristics were studied under various conditions.3. Studies on Behavior of Protons in SrCeO_3-based CeramicsConcentration and mobility of proton were determined systematically by a thermal desorption method under various conditions, and the behavior of protons in the oxides was discussed.4. Synthesis of New Proton Conductors for SeparatorBaCe_<1-x> Sm_x O_<3-alpha> ceramics were found to be highly conductive protonic conductors and some CaZrO_3-based ceramics to be good protonic conductors stable against CO_2 at high temperature.