Abstract: A fuel cell system capable of suppressing influence of fuel crossover and achieving long-time power generation and an electronic device using it are provided. The fuel cell system includes a power generation section having an electrolytic solution between a fuel electrode and an oxygen electrode, a fuel supply section supplying a fuel to the fuel electrode, and a control section making the fuel supply section stop supplying the fuel to the fuel electrode and thereby performing electrolytic solution cleaning to remove a fuel contained in the electrolytic solution.

Abstract: Provided is a fuel cell capable of eliminating influence of gravity with a simple configuration and capable of obtaining a high energy density while suppressing crossover. The fuel cell in which a fuel electrode and an oxygen electrode are oppositely disposed include an electrolyte channel provided between the fuel electrode and the oxygen electrode and flowing a first fluid including an electrolyte, and a fuel channel provided on the opposite side of the oxygen electrode from the fuel electrode and flowing a second fluid including a fuel.

Abstract: To provide an electrochemical energy generating apparatus which can regulate the operating conditions of an electrochemical device such as a fuel cell, according to a change of the internal properties of the device, achieving high energy density, and a method for driving the apparatus.

Abstract: [Object] The present invention provides a reactant delivery system capable of delivering reaction gas with good control in both space and time despite its simple construction that it can be assembled in mobile equipment, and also a reactor provided with the reactant delivery system. [Solving Means] The electrochemical energy generation system 50 has a fuel cell 10, a fuel delivery system 20, a measuring unit 30 for measuring an operation state of the fuel cell 10, and a control unit 40 for determining operation conditions on a basis of the results of the measurement. At an optimal rate determined by the control unit 40, the fuel is delivered in the form of gas from the fuel delivery system 20. The source fuel 21 such as methanol is introduced to between the backing portion 26 and the penetration and evaporation portion 27, the source fuel 21 evaporates into the fuel gas 13 from the surface of the penetration and evaporation portion 27.