Differential pressure electrolysis cell and differential pressure electrolysis stack

A differential pressure electrolysis cell comprising:

• a membrane electrode assembly including an electrolyte membrane, a first electrode catalyst layer stacked on one surface of the electrolyte membrane, and a second electrode catalyst layer stacked on another surface of the electrolyte membrane;
• a first separator located across the electrolyte membrane from the second electrode catalyst layer;
• a second separator located across the electrolyte membrane from the first electrode catalyst layer;
• a first current collector disposed between the first separator and the first electrode catalyst layer;
• a second current collector disposed between the second separator and the second electrode catalyst layer;
• and
• a pressing member sandwiched and held between the second current collector and the second separator and configured to press the second current collector toward the second electrode catalyst layer;
• wherein the differential pressure electrolysis cell applies a voltage between the first current collector and the second current collector to electrolyze a fluid supplied to the membrane electrode assembly and thereby generate a gas in the second electrode catalyst layer, and is configured to cause the gas to have a higher pressure than a pressure of the fluid, and
• the pressing member includes a sheet portion that is formed of a polymer material having an electrical insulating property so as to be elastically deformable, and is disposed between the second current collector and the second separator in a state of being compressed and deformed in a stacking direction of the membrane electrode assembly.