In a fuel cell system comprising a first zone (1) and a second zone (2), wherein the first zone (1) comprises a reaction area (4), wherein the second zone (2) comprises a fluidic connection (6, 7), wherein the fuel cell system comprises a decoupling structure (3) located between the first zone (1) and the second zone (2), wherein the decoupling structure (3) is configured to achieve an at least partial thermal decoupling between the first zone (1) and the second zone (2), the fuel cell system is configured to maintain a temperature of the first zone (1) essentially stable during an operation of the fuel cell system.