Manganese oxide/poly(3,4-ethylenedioxythiophene) hybrid electrocatalysts for the oxygen reduction reaction in alkaline fuel cells [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.3 Electrical, magnetic, optical, communications, computer engineering; electronics, lighting
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: 6 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 256389
• Chủ đề: 1. 30 direct energy conversion; 2. 36 materials science

Tóm tắt

 Manganese oxide/poly(3,4-ethylene-dioxythiophene) (MnO<
 sub>
 x<
 /sub>
 / PEDOT) nanostructured hybrid thin films were prepared using a simple anodic electrodeposition process from aqueous solution, and then tested for oxygen reduction reaction (ORR) activity in alkaline electrolyte using rotating disk electrode and rotating ring disk electrode methods. MnO<
 sub>
 x<
 /sub>
 /PEDOT provided improvements over MnO<
 sub>
 x<
 /sub>
 -only and PEDOT-only control films, with >
  0.2 V decrease in onset and half-wave overpotentials, and >
  1.5 times increase in terminal current density. The MnO<
 sub>
 x<
 /sub>
 /PEDOT film exhibited only a slightly lower n value (n = 3.86-3.92) than the 20% Pt/C benchmark electrocatalyst (n = 3.98) across all potentials. MnO<
 sub>
 x<
 /sub>
 /PEDOT also displayed a more positive half-wave potential and superior electrocatalytic selectivity for the ORR upon methanol exposure than 20% Pt/C. Here, the high activity and synergism of MnO<
 sub>
 x<
 /sub>
 /PEDOT towards the ORR is attributed to effective intermixing/dispersion of the two materials, intimate substrate contact with improved charge transfer processes attained by co-electrodepositing MnO<
 sub>
 x<
 /sub>
  with PEDOT and due to the increase in Mn<
 sup>
 3+<
 /sup>
  content at the surface of the oxide.