Low Cost Reversible fuel cell systems Page: 3 of 23
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Technology Management, Inc. December 31, 2003
9718 Lake Shore Blvd.
Cleveland, OH 44108
(216) 541-1000; FAX (440) 720-4527; tmi@stratos.net
Final Report: Phase III - Low Cost, High Efficiency Reversible Fuel Cell Systems
Table of Contents
1. Executive Summary.............................................................................................. 2
2. Introduction............................................................................................................. 4
3. Phase I and II Review ......................................................................................... 6
3.1 Phase I (March through September 2000) Review .................................................................................. 6
3.2 Phase II (February 2001 through April 2002) Review ........................................................................... 7
4. Phase III Summary of Results ............................................................................. 9
4.1 Objectives ................................................................................................................................................... 9
4.2 Technical Approach .................................................................................................................................... 9
4.3 Tasks and Milestones .................................................................................................................................. 9
5. Results: Cell Development.................................................................................. 11
5.1 C ell and Stack Fabrication (Task 2)...................................................................................................... 11
5.2 Sealing (Task 1.3) ..................................................................................................................................... 11
5.3 Polarization and ASR (Task 1.1)............................................................................................................... 12
5.4 Degradation Rate (Task 1.2) ..................................................................................................................... 14
6. Results: Demonstration System......................................................................... 15
6.1 Equipment Construction (Tasks 3.1 and 3.2) ......................................................................................... 15
6.2 System Testing and Demonstration (Task 3.3)..................................................................................... 16
6.3 Electrolysis Testing (Task 3.3).................................................................................................................. 16
7. Results: Engineering and Cost Studies (Task 4)................................................ 18
8. Conclusions........................................................................................................... 22
9. Recommendations for Future Work................................................................... 23
Table of Figures
Figure 1. TM I Reversible Solid Oxide Cell ............................................................ 4
Figure 2. Reversible Cell Polarization .................................................................. 7
Figure 3. Reversible Cell Cathode Seal................................................................. 11
Figure 4. Reversible Three Cell Stack with Alternate Cathode........................... 13
Figure 5. Impact of Cathode Thickness on Cell Performance for Passive Cells. ... 13
Figure 6. Reversible Degradation Rate of a 3-Cell Stack .................................. 14
Figure 7. Reversible Stack Demonstration System ................................................ 15
Figure 8. Durability of a 30-Cell Stack with Passive Operation on Natural Gas.... 17
Figure 9. Simplified System Schematic for a Reversible Residential System with
Vehicular Hydrogen Generation........................................................................... 19
Table of Tables
Table 1. Phase One Studies ..................................................................................... 6
Table 2. Costs and Efficiency Comparisons ............................................................ 8
Table 3. C~ M easurements on Seals..................................................................... 11
Table 4. Maximum Efficiency Large Stack Testing on Natural Gas or Methane.... 16
Table 5. Electrolysis Testing on a 30-cell Passive Stack...................................... 173
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Inc., Technology Management. Low Cost Reversible fuel cell systems, report, December 30, 2003; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc786410/m1/3/: accessed April 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.