Flow field of a fuel cell

A fuel cell, comprising:

• an ion-selective separator;
• a gas diffusion layer situated adjacent to the separator;
• and
• a separator plate which, together with the gas diffusion layer, forms a gas-conducting flow field,
• wherein
• a plurality of ducts extend between a media inlet duct and a media exhaust duct,
• at least one of the plurality of ducts has an upstream portion and a downstream portion having a constant width transverse to a gas flow direction of a gas flow,
• the at least one duct of the plurality of ducts includes
• a first barrier configured to divide at least a section of the upstream portion of the at least one duct into a first convergent duct section and a first divergent duct section laterally adjacent to one another relative to the gas flow direction, the first barrier being arranged between parallel side walls of the upstream portion, and
• at least one additional barrier configured to divide at least a section of the downstream portion of the at least one duct into at least one additional convergent duct section and at least one additional divergent duct section laterally adjacent to one another relative to the gas flow direction, the at least one additional barrier being arranged between parallel side walls of the downstream portion, and
• the first barrier is arranged such that at least a portion of the gas flow along the first barrier passes from the first convergent duct section through the gas diffusion layer into the first divergent duct section at the first barrier,
• the at least one additional barrier is arranged such that at least a portion of the gas flow along the at least one additional barrier passes from the additional convergent duct section through the gas diffusion layer into the additional divergent duct section at the at least one additional barrier,
• between the first barrier and the at least one additional barrier there is arranged at least one mixing zone into which at least one of the first convergent section and the first divergent duct section empty and from which the at least one additional convergent duct section and at least one additional divergent duct section receive the gas flow.