自動車排気ガス浄化用多層構造電気化学セルの設計(<特集>セラミックスインテグレーション)

概要

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Multi-layered electrochemical cells for exhausts gas purification, which consist of a LSCF/CGO composite catalytic electrode, a CGO buffer layer, and ScSZ solid electrolyte, were prepared, and their electrochemical properties and NO decomposition behaviors were investigated. Owing to the presence of a CGO buffer layer, the harmful interfacial reaction between LSCF and ScSZ, which resulted in a resistance increase of the electrochemical cell, could be prevented. Consequently, it was possible to reduce the electrode/electrolyte interfacial resistance of the cell by integrating the LSCF/CGO electrode and ScSZ electrolyte covered by CGO buffer layer. The CGO buffer layer was deposited on the ScSZ electrolyte by two different methods: a screenprinting and a pulsed-laser deposition (PLD) process. The screen-printed CGO buffer layer showed a porous microstructure, while a dense CGO layer could be obtained by PLD process. It was found that the microstructure of the CGO buffer layer influenced strongly the ohmic resistance of the electrochemical cells. A consuming electrical power for NO decomposition was reduced by constructing multi-layered electrochemical cell, LSCF/CGO (cathode) | CGO (buffer layer deposited by PLD) | ScSZ (electrolyte) | CGO (buffer layer) | LSCF/CGO.
社団法人日本セラミックス協会の論文
2002-05-01