Method and system for examining a fuel cell by means of a cyclic voltammetric measurement

According to the invention, a gas composition, in particular a hydrogen excess, is ascertained in a fuel cell (5) by means of a cyclic voltammetric measurement for the purposes of examining said fuel cell (5). A particularly advantageous use of the invention lies in the monitoring of a hydrogen excess in the gas spaces (6, 7) of a storing or non-operated fuel cell (5), in particular also in the remote monitoring thereof. However, it can also be used very advantageously for the purposes of monitoring and/or controlling a deactivation procedure of a fuel cell (5), in particular in order to set a desired gas atmosphere in the fuel cell (5), such as, e.g., a hydrogen excess, in the process. This is possible without interventions in the fuel cell (5) using only a single measuring device. All that is required is an access to the electrical load terminals of the fuel cell.