A high temperature reduction cleaning (HTRC) process: A novel method for conductivity recovery of yttrium-doped barium zirconate electrolytes
| Autor: | Donglin Han, Tetsuya Uda, Kenji Kazumi, Shigeaki Uemura, Masatoshi Majima, Chihiro Hiraiwa, Junji Iihara |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Nickel oxide Inorganic chemistry Non-blocking I/O chemistry.chemical_element 02 engineering and technology General Chemistry Yttrium Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode chemistry visual_art visual_art.visual_art_medium General Materials Science Grain boundary Ceramic 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 4(27):10601-10608 |
| ISSN: | 2050-7496 |
| Popis: | Proton conducting Y-doped BaZrO3 (BZY) and nickel oxide (NiO) are currently the most promising electrolyte and anode catalyst for protonic ceramic fuel cells, respectively. However, during the co-sintering process to fabricate the fuel cells, Ni cations diffuse from the anode into the lattice of the BZY electrolyte, resulting in significant degradation of the electrolyte conductivity and fuel cell performance. With the aim to solve such a problem, in this work, we report a novel method, named as high temperature reduction cleaning (HTRC) process, which is composed of several sequential heat-treatments in controlled atmospheres. The most interesting point is that after heat-treating the NiO-contaminated BZY at 1400 °C in a Ti-deoxidized Ar atmosphere for 100 h, Ni cations were observed to be expulsed from the BZY lattice and segregated at the grain boundary as Ni metal particles. And the conductivity of the BZY electrolyte was recovered. However, delamination along the grain boundary of the BZY electrolyte was introduced when the segregated Ni metal particles were oxidized to NiO particles in an oxygen atmosphere. And a series of sequential heat-treatments were designed to solve such a problem. |
| Databáze: | OpenAIRE |
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