ELECTROCHEMICAL CELL, AND ELECTROCHEMICAL REACTION CELL STACK

• Main Authors: YAMAGIWA KATSUYA, FUNAHASHI YOSHIHIRO, TAKEICHI TOSHINORI, MATSUO TOMOAKI
• Format: Patent
• Language: English; Japanese
• Published: 01.03.2021
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To enhance the performance of an electrochemical cell.SOLUTION: An electrochemical cell comprises: an electrolyte layer containing a solid oxide; an air electrode disposed on one side of the electrolyte layer in a first direction; and a fuel electrode disposed on the other side of the electrolyte layer in the first direction and containing a metal including Ni, and an ion conducting oxide. The fuel electrode has a particular region in the fuel electrode, which is a region ranging from an interface with the electrolyte layer to a distance of 10 μm from the interface in at least one cross section in parallel with the first direction. When a pore areal percentage, which is a rate of an area of the ion conducting oxide to an area of the particular region, is Sa%, a pore areal percentage, which is a rate of a total area of pores located in the particular region to an area of the particular region, is Sb%, and the number of pores per unit area in the particular region is N/μm2, the electrochemical cell satisfies the following expressions: (1) Sa≥30; and (2) Sb/N≤54.SELECTED DRAWING: Figure 12 【課題】電気化学セルの性能を向上させる。【解決手段】電気化学セルは、固体酸化物を含む電解質層と、電解質層の第１の方向の一方側に配置された空気極と、電解質層の第１の方向の他方側に配置された燃料極であって、Ｎｉを含む金属と、イオン伝導性酸化物とを含む燃料極とを備える。電気化学セルは、第１の方向に平行な少なくとも１つの断面において、燃料極における電解質層との界面からの距離が１０μｍまでの領域である特定領域について、特定領域の面積に対するイオン伝導性酸化物の面積の割合である気孔面積率をＳａ％とし、特定領域の面積に対する特定領域に存在する各気孔の面積の合計の割合である気孔面積率をＳｂ％とし、特定領域における単位面積あたりの気孔の個数をＮ個／μｍ２としたとき、式（１）：Ｓａ≧３０と、式（２）：Ｓｂ／Ｎ≦５４とを満たす。【選択図】図１２