HIGH TEMPERATURE STEAM ELECTROLYSIS CELL, HYDROGEN ELECTRODE LAYER THEREFOR, AND SOLID OXIDE ELECTROCHEMICAL CELL

摘要

PROBLEM TO BE SOLVED: To provide a solid oxide electrochemical cell capable of making the shrinking behavior of its hydrogen electrode layer practicably similar to the shrinking behavior of its electrolyte layer.SOLUTION: A solid oxide electrochemical cell or SOEC1 is constituted of an electrolyte layer 13 constituted of an electrolyte that can conduct an oxygen ion and does not allow gas to flow therethrough, and a hydrogen electrode layer 10 that is laminated over the outer side in the thickness direction T of the electrolyte layer 13, has a skeleton of a network structure, is constituted of a porous material allowing gas to flow through open pores surrounded by the skeleton, and can electrolyze steam flowing into the open pores into an oxygen ion and hydrogen. The hydrogen electrode layer 10 includes at least one composite layer (101, 102) that is a layer of composite particles prepared by sintering first particles constituting the base material of the skeleton of a network structure and second particles that is less easily reduced relative to the first particles, with the second particles disposed in a dispersed state on the surface of a part of the skeleton facing the open pores.SELECTED DRAWING: Figure 1