Patent ID: 8895200

Claim:
A fuel cell system having a fuel cell, comprising: a power generation-time gas supplier that supplies a hydrogen-containing fuel gas to an anode of the fuel cell and supplies an oxygen-containing oxidizing gas to a cathode of the fuel cell during power generation of the fuel cell; and a processor that executes control logic to: acquire anode potential rise information, which represents information regarding a status of an anode potential rise of the fuel cell and includes information regarding a number of stoppages of power generation, after termination of supplies of the fuel gas and the oxidizing gas by the power generation-time gas supplier; and refer to the information regarding the number of stoppages of power generation and a pre-stored relationship between the information regarding the number of stoppages of power generation and an anode morphology variation representing a degree of a morphology change of a catalyst metal included in the anode so as to derive the anode morphology variation.