This is the author’s ǀersion of a ǁork that ǁas aĐĐepted for puďliĐation in Electrochimica Acta Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms, may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in: Electrochimica Acta 146, pages 335-345, 11/2014 DOI: 10.1016/j.electacta.2014.08.056 url: http://www.sciencedirect.com/science/article/pii/S001346861401679X