MEDIUM-TO-LOW-TEMPERATURE HIGH-EFFICIENCY ELECTROCHEMICAL CELL AND ELECTROCHEMICAL REACTION SYSTEM COMPRISING SAME

The present invention is an electrochemical cell that achieves generation efficiency of 40% or more even in a medium-to-low-temperature region at or below 700°C, and a generation method in which the electrochemical cell is used. The electrochemical cell has a structure in which a fuel electrode having an interface with a fuel gas, a dense ion conductor (electrolyte) and an air electrode having an interface with air (oxygen) are layered in this order, the fuel electrode and the air electrode are not in contact with each other and are separated by the electrolyte, and a structure in which a functional layer having a porous structure and promoting electrochemical reactions is layered on part or all of the fuel electrode surface that is an interface with the fuel gas. The present invention allows providing a high-efficiency electrochemical reaction system that utilizes a gaseous hydrogen fuel and contributes to solving environmental and energy problems by significantly lowering resistance derived from internal diffusion of a gaseous hydrogen fuel gas in a fuel electrode, and by making it possible to achieve, at a single-cell level, a generation efficiency of 40% or more even in a medium-to-low-temperature region at or below 700°C.