Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6601184 | Electrochemistry Communications | 2015 | 13 Pages |
Abstract
We use the rotating ring disk (RRDE) method to study activity-selectivity relationships for the oxygen reduction reaction (ORR) on Pt(111) modified by various surface coverages of adsorbed CNad (ÎCNad). The results demonstrate that small variations in ÎCNad have dramatic effect on the ORR activity and peroxide production, resulting in “volcano-like” dependence with an optimal surface coverage of ÎCNad = 0.3 ML. These relationships can be simply explained by balancing electronic and ensemble effects of co-adsorbed CNad and adsorbed spectator species from the supporting electrolytes, without the need for intermediate adsorption energy arguments. Although this study has focused on the Pt(111)-CNad/H2SO4 interface, the results and insight gained here are invaluable for controlling another dimension in the properties of electrochemical interfaces.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Eduardo G. Ciapina, Pietro P. Lopes, Ram Subbaraman, Edson A. Ticianelli, Vojislav Stamenkovic, Dusan Strmcnik, Nenad M. Markovic,