Method for driving gas sensor, and gas detection device

A gas sensor driving method for a gas sensor that (i) includes:

• a first electrode including a first principal surface;
• a second electrode including a second principal surface;
• a metal-oxide layer interposed between the first principal surface and the second principal surface that face each other;
• and
• an insulating film covering the first electrode, the metal-oxide layer, and the second electrode, and exposing at least a part of a third principal surface of the second electrode, the third principal surface being disposed on an opposite side of the second principal surface, and
• (ii) detects hydrogen in accordance with a change in a resistance value of the metal-oxide layer occurring when the part of the third principal surface contacts gas including gas molecules containing hydrogen atoms in a state in which a voltage is applied across the first electrode and the second electrode,
• the gas sensor driving method comprising:
• repeatedly applying a positive voltage and a negative voltage across the first electrode and the second electrode.