Limiting diffusion currents were measured at the inner surface of sintered nickel electrodes sheets and a model adapted from heterogeneous catalysis was used to quantify the minimum mass transfer within the porous material. External mass transport from the bulk electrolyte was induced by rotating a disc facing the sintered nickel disc electrode located at the bottom of a cylinder. Values of the volumetric mass transfer coefficient at two sintered materials were thus obtained. The method and its limitations are discussed.