Tag: Basic principles of fuel cells

Electrode polarization and energy conversion efficiency in fuel cells

Electrode polarization and energy conversion efficiency in fuel cells

(1) Electrode polarization. When the battery is working (with current passing through the electrodes), the phenomenon that the electrode potential deviates from the reversible potential is called electrode polarization. The larger the deviation value, the more severe the polarization. The degree of polarization of the electrode can be represented by the overpotential n, and the […]

Reversible electromotive force and electrochemical reaction rate of fuel cells

Reversible electromotive force and electrochemical reaction rate of fuel cells

(1) The reversible electromotive force of the battery. The heat-electric energy conversion relationship followed by the fuel cell is ΔG=-nFEr     (1-1) When the activities of the substances participating in the reaction are all equal to 1, rewrite as ΔGΘ=-nFErΘ     (1-2) In the formula: Er is the reversible electromotive force (or reversible potential) of the battery reaction; ΔG […]

Cell reactions of fuel cells

Cell reactions of fuel cells

A fuel cell is an isothermal electrochemical unit that directly converts the chemical energy stored in the fuel and oxidant into electrical energy, and an energy conversion device that directly converts the chemical energy of the supplied fuel into electrical energy. It is a power generation device that can continuously obtain electric power by continuously […]