High Performing and Durable Pyrophosphate Based Composite Membranes for Intermediate Temperature Fuel Cells [Slides] [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.312 Generation, modification, storage
• 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, 2020
• Mô tả vật lý: Size: 22 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 256082
• Chủ đề: 1. 30 direct energy conversion; 2. 36 materials science; 3. 42 engineering; 4. Energy sciences; 5. Material science

Tóm tắt

 Objective: Develop a novel proton conducting electrolyte operating at >
 200�C with conductivity ? ? 100 mScm<
 sup>
 ?1<
 /sup>
  and RH <
  1%. Fabrication of membranes of less than 40?m thickness while retaining high conductivity will result in ASR <
 0.04 ?cm<
 sup>
 2<
 /sup>
 . Evaluate membrane durability in terms of crossover, shorting resistance, and open circuit voltage, as well as against temperature cycling. Relevance: Operating FCs in the intermediate temperature range has the potential to greatly reduce cost and simplify water and thermal management. This effort requires novel materials and approaches to meet DOE membrane performance and durability targets. MPP/Polymer composite membranes show promise in early development for application in IT-FCs for transportation applications. Approach: We have demonstrated that both cation dopants and phosphate precursor influence MPP conductivity and identified the most promising MPP compositions for membrane fabrication. The ceramic MPP materials are fabricated as a composite membrane in a 90:10 wt% ratio with Nafion. We have modified our membrane fabrication procedure to improve the density of our membranes. Accomplishments: We demonstrated through-plane membrane conductivity of 95mScm<
 sup>
 -1<
 /sup>
  at T >
  200�C and RH<
 0.04bar with a thickness 50?m. We demonstrated FC performance up to 94hrs at 220�C and <
 1% RH with a 50?m thick membrane exhibiting an OCV of 0.98V and ASR of 0.08 Wcm<
 sup>
 2<
 /sup>
 . Future work: Further decrease in ASR is expected by decreasing the membrane thickness to <
 40?m. ITPP with higher P:M ratio will be used to increase the conductivity of the starting material. Long term durability will be assessed against DOE technical targets