Cell for water electrolysis/fuel cell power generation and cell stack body having a plurality of same cells stacked

A water electrolysis cell and/or a fuel power cell and/or a reversible cell, comprising:

• a cell stack part in which a first gas diffuser, an oxygen-side electrode layer held on the first gas diffuser, an electrolyte layer, an electrolyte holding portion which holds the electrolyte layer, a hydrogen-side electrode layer, and a second gas diffuser which holds the hydrogen-side electrode layer are stacked, and a catalyst layer is provided between the oxygen-side electrode layer and the electrolyte layer and/or between the electrolyte layer and the hydrogen-side electrode layer;
• an oxygen-containing gas flow path provided in the first gas diffuser in a second direction substantially perpendicular to the stacking direction;
• a hydrogen-containing gas flow path provided in the second gas diffuser in a third direction substantially perpendicular to the stacking direction and the second direction;
• and
• a water flow path provided in the electrolyte holding portion in a first direction substantially perpendicular to the stacking direction and configured to supply or discharge water from a side surface of a layer including the electrolyte,
• wherein each of the oxygen-side electrode layer and the hydrogen-side electrode layer is an electrode layer having water repellency,
• the water flow path, the oxygen-containing gas flow path, and the hydrogen-containing gas flow path are completely independent and separated from each other,
• the first gas diffuser is configured to diffuse oxygen gas passing therethrough and to separate oxygen gas from water, and
• the second gas diffuser is configured to diffuse hydrogen gas passing therethrough and to separate hydrogen gas from water.