ELECTROCHEMICAL CELL, POWER GENERATION METHOD USING ELECTROCHEMICAL CELL, AND MANUFACTURING METHOD OF HYDROGEN GAS USING ELECTROCHEMICAL CELL

Provided is an electrochemical cell, a power generation method using the electrochemical cell, and a manufacturing method of a hydrogen gas using the electrochemical cell that are suitable for the use in a temperature range between 200° C. and 600° C. A fuel cell (electrochemical cell) includes a proton conductor represented by (Li, H)Zn(GeO)where a portion of lithium ions of LiZn(GeO)where x is a number equal to or more than 0 is substituted with protons, the proton conductor having electric conductivity of 0.01 S/cm or more at 300° C., an anode provided on one side of the proton conductor, a cathode provided on another side of the proton conductor, a first separator provided on an anode side of the proton conductor to define an anode chamber and a second separator provided on a cathode side of the proton conductor to define a cathode chamber