ELECTROCHEMICAL REACTION SINGLE CELL, ELECTROCHEMICAL REACTION CELL STACK, AND METHOD FOR MANUFACTURING ELECTROCHEMICAL REACTION SINGLE CELL

• Main Authors: YAMAGIWA KATSUYA, MURAMATSU MASAKI, ITO MASAYA
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide an electrochemical reaction cell which enables the suppression of the worsening of the performance of an electrochemical reaction single cell by suppressing the increase in IR resistance owing to excessively increase in the thickness of an electrolyte layer and suppressing the occurrence of gas leak owing to the worsening of the denseness of an electrolyte layer in a solid oxide fuel cell (SOFC).SOLUTION: An electrochemical reaction single cell comprises: an electrolyte layer 112 including a solid oxide; a porous fuel electrode 116 disposed on one side of the electrolyte layer 112 in a first direction; and a porous air electrode 114 disposed on the other side of the electrolyte layer 112 in the first direction. A particular electrode, which is one of the fuel electrode 116 and the air electrode 114, has a surface opposed to the electrolyte layer 112, and the surface has a surface roughness Rz of 30 μm or less. The opening rate of part of the particular electrode on the side of the electrolyte 112 is 5% or more and less than 35%. The electrolyte layer 112 includes a yttria-stabilized zirconia as the solid oxide, and has a thickness of 20 μm or less.SELECTED DRAWING: Figure 6 【課題】固体酸化物形の燃料電池（ＳＯＦＣ）において、電解質層の厚さが過度に厚くなることによるＩＲ抵抗の増大を抑制しつつ、電解質層の緻密性が低下することによるガスリークの発生を抑制して、電気化学反応単セルの性能の低下を抑制する電気化学反応セルの提供。【解決手段】電気化学反応単セル、固体酸化物を含む電解質層１１２と、電解質層１１２の第１の方向の一方側に配置された多孔質な燃料極１１６と、電解質層１１２の第１の方向の他方側に配置された多孔質な空気極１１４とを備え、燃料極１１６と空気極１１４との一方である特定電極における電解質層１１２に対向する表面の表面粗さＲｚは、３０μｍ以下である電気化学反応セル。特定電極における電解質１１２側の部分の開口率が５〜３５％未満である電気化学反応セル。電解質層１１２は固体酸化物として、イットリア安定化シルコニアを含み、その厚さが２０μｍ以下である、電気化学セル。【選択図】図６