Mass transfer controlled by gas evolution at electrodes has previously been widely studied. However, the resulting correlations deviate considerably from each other, mainly because they did not take into account the various interacting mechanisms. The present paper gives an overview of these models. A model is then presented taking into account all the decisive mechanisms and their interactions. As a result, a new mass transfer correlation is derived suitable for industrial and basic applications. (C) 2015 Elsevier Ltd. All rights reserved.