Electrodeposited MnOx/PEDOT Composite Thin Films for the Oxygen Reduction Reaction

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• 作者：Julian A. Vigil ; Timothy N. Lambert ; Kaitlyn Eldred
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：22745-22750
• 全文大小：396K
• ISSN：1944-8252

文摘

Manganese oxide (MnO_x) was anodically coelectrodeposited with poly(3,4-ethylenedioxythiophene) (PEDOT) from an aqueous solution of Mn(OAc)₂, 3,4-ethylenedioxythiophene, LiClO₄ and sodium dodecyl sulfate to yield a MnO_x/PEDOT composite thin film. The MnO_x/PEDOT film showed significant improvement over the MnO_x only and PEDOT only films for the oxygen reduction reaction, with a >0.2 V decrease in onset and half-wave overpotential and >1.5 times increase in current density. Furthermore, the MnO_x/PEDOT films were competitive with commercial benchmark 20% Pt/C, outperforming it in the half-wave ORR region and exhibiting better electrocatalytic selectivity for the oxygen reduction reaction upon methanol exposure. The high activity of the MnO_x/PEDOT composite is attributed to synergistic charge transfer capabilities, attained by coelectrodepositing MnO_x with a conductive polymer while simultaneously achieving intimate substrate contact.