In this paper we report an enhancement of anomalous codeposition in NiFe electrodeposition when using nanoporous templates. Depending on the deposition potential it is possible to obtain homogeneous nanowires of a high Fe concentration or of a concentration similar to the one of the electrolyte used. In addition, nanowires with a decreasing Fe concentration are found for intermediate overpotentials. Voltammetric studies relate this effect with a possible higher block of the cathode surface by adsorption. of intermediated species in nanopores. A study of the effect of hydrogen bubbles shows a change in the composition in the areas surrounding the bubbles, and yields an increase in the deposition rate, which results in longer nanowires. (C) 2013 Elsevier Ltd. All rights reserved.