New electrolytes for direct methane fuel cells. Final report, January 10,1977-January 9, 1979. [Methanesulfonic acids]

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The program is aimed at developing a fuel cell electrolyte for the direct oxidation of CH/sub 4/ and/or impure H/sub 2/ fuels. Of interest are di- and tribasic methanesulfonic acids CX/sub 2/(SO/sub 3/H)/sub 2/ and CX(SO/sub 3/H)/sub 3/ where X is H, F, or C1. Synthetic routes to CH/sub 2/(SO/sub 3/H)/sub 2/, CH(SO/sub 3/H)/sub 3/, CCl/sub 2/(SO/sub 3/H)/sub 2/, and CCl(SO/sub 3/H)/sub 3/ have been identified and optimized. The diphenyl ester of CF/sub 2/(SO/sub 3/H)/sub 2/ has been prepared for the first time and various approaches to CF(SO/sub 3/H)/sub 3/ have been investigated. In parallel with the synthetic program, apparatus ... continued below

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Pages: 74

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Brummer, S.B.; Foos, J.; McHardy, J.; McVeigh, J.; Toland, D. & Turner, M. May 1, 1979.

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Description

The program is aimed at developing a fuel cell electrolyte for the direct oxidation of CH/sub 4/ and/or impure H/sub 2/ fuels. Of interest are di- and tribasic methanesulfonic acids CX/sub 2/(SO/sub 3/H)/sub 2/ and CX(SO/sub 3/H)/sub 3/ where X is H, F, or C1. Synthetic routes to CH/sub 2/(SO/sub 3/H)/sub 2/, CH(SO/sub 3/H)/sub 3/, CCl/sub 2/(SO/sub 3/H)/sub 2/, and CCl(SO/sub 3/H)/sub 3/ have been identified and optimized. The diphenyl ester of CF/sub 2/(SO/sub 3/H)/sub 2/ has been prepared for the first time and various approaches to CF(SO/sub 3/H)/sub 3/ have been investigated. In parallel with the synthetic program, apparatus was designed and fabricated for the testing of the electrolytes under fuel cell conditions. A new PTFE test cell was developed for testing small amounts of electrolyte. Electrodes with low Pt loading were developed for use in electrolyte evaluation. Optimum performance with H/sub 3/PO/sub 4/ was achieved using 1 mg Pt/cm/sup 2/ and 1 mg TFE 30/cm/sup 2/ deposited on TFE tape, supported on a Au plated Ta screen, and sintered. Preliminary half cell tests using CH/sub 2/(SO/sub 3/H)/sub 2/ and CH(SO/sub 3/H)/sub 3/ indicated that these acids are insufficiently stable for use as fuel cell electrolytes. However, tests using CCl/sub 2/(SO/sub 3/H/sub 2/) and CCl(SO/sub 3/H)/sub 3/ were encouraging, yielding H/sub 2/ oxidation rates equal to or better than those using H/sub 3/PO/sub 4/. Stability tests were conducted by heating a sample of each acid at 130/sup 0/ for 30 days under atmospheres of N/sub 2/, O/sub 2/, and H/sub 2/. At the end of the test, each sample was analyzed for decomposition. In no case did IR analysis indicate significant decomposition and, in the case of the chloroacids, only a trace amount of free Cl/sup -/ was observed. Conductivity measurements showed the aqueous acids to be of the same conductivty as aqueous H/sub 3/PO/sub 4/. The dihydrate of CH/sub 2/(SO/sub 3/H)/sub 2/ was found to be more conductive than CF/sub 3/SO/sub 3/H.H/sub 2/O but less conductive than 100% H/sub 3/PO/sub 4/.

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Pages: 74

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: DOE/ET/11321-T1
  • Grant Number: EY-76-C-03-1363
  • DOI: 10.2172/5712244 | External Link
  • Office of Scientific & Technical Information Report Number: 5712244
  • Archival Resource Key: ark:/67531/metadc1093158

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  • May 1, 1979

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 9, 2018, 11:27 a.m.

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Brummer, S.B.; Foos, J.; McHardy, J.; McVeigh, J.; Toland, D. & Turner, M. New electrolytes for direct methane fuel cells. Final report, January 10,1977-January 9, 1979. [Methanesulfonic acids], report, May 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1093158/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.