This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of Editor-in-Chief. At the end of August 2015 the Editorial Office of Electrochimica Acta received a message from the corresponding author of this paper stating that he never submitted this manuscript to the journal. Upon inquiry it was found that the initial version of the manuscript had been submitted to the journal from the EES account of J.C. Zheng (jczhengedu@outlook.com), College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China. Nevertheless, J.C. Zheng is non-existent and was never employed by the School of Chemistry and Chemical Engineering of Chongqing University. Moreover, the revised version of the article was submitted to Elsevier with a different authorship, including a new email address for the corresponding author (lijungdut@sina.com). The email address of the corresponding author was then changed to the one given in the published version of the article upon proof correction. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to the authors of the published version and the readers of the journal.