Performance of Polymer Electrolyte Fuel Cell Electrodes with Atomically Dispersed (AD) Fe-C-N ORR Catalyst [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 333.8 Subsurface resources

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2019

Mô tả vật lý: Size: p. F1096-F1104 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 255617

 Activity of (AD)Fe-N-C catalyst with low Fe content is investigated in differential cells prepared by hot pressing anode gas diffusion electrodes (0.2 mg<
 sub>
 Pt<
 /sub>
 /cm<
 sup>
 2<
 /sup>
 ) to N211 membrane and brush painting the cathode catalyst ink. Polarization curves obtained in H<
 sub>
 2<
 /sub>
 /O<
 sub>
 2<
 /sub>
  show double Tafel slopes which, in conjunction with the redox potential observed in cyclic voltammetry traces, forms the basis for a distributed ORR (oxygen reduction reaction) kinetic model with potential-dependent available sites. Application of this model to polarization data in H<
 sub>
 2<
 /sub>
 /air provides the basis for formulating an oxygen transport model and leads to 7.7 � mA0.6 mA/cm2 catalyst activity at 0.9 V, 31.5-34.3 mA/cm<
 sup>
 2<
 /sup>
  cell performance at 0.8 V, and 0.8-2 s/cm O<
 sub>
 2<
 /sub>
  transport resistance. A coupled kinetic, O<
 sub>
 2<
 /sub>
  transport and proton transport illustrates the projected improvements needed in catalyst activity and electrode structure to approach the automotive target of 1000 mW/cm<
 sup>
 2<
 /sup>
  stack power density while meeting the 1.45 kW/degrees C heat rejection constraint at 1.5 cathode stoichiometry. The model indicates that we need twelve-fold higher mass activity for reducing the kinetic losses, doubling of active site density and an engineered electrode structure for 50% lower proton transport resistance, as well as a 50% reduction in electrode thickness to limit the O<
 sub>
 2<
 /sub>
  transport losses.
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