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

Abstract

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 usingmore » 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/.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
EIC Corp., Newton, MA (USA)
OSTI Identifier:
5712244
Report Number(s):
DOE/ET/11321-T1
DOE Contract Number:  
EY-76-C-03-1363
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ACID ELECTROLYTE FUEL CELLS; ELECTROLYTES; HYDROCARBON FUEL CELLS; SULFONIC ACIDS; ELECTRIC CONDUCTIVITY; STABILITY; SYNTHESIS; AIR; CHEMICAL PREPARATION; CHLORINATION; ELECTRODES; HYDROGEN; METHANE; PERFORMANCE; PERFORMANCE TESTING; PHOSPHORIC ACID; TEMPERATURE DEPENDENCE; ALKANES; CHEMICAL REACTIONS; CRYOGENIC FLUIDS; DIRECT ENERGY CONVERTERS; ELECTRICAL PROPERTIES; ELECTROCHEMICAL CELLS; ELEMENTS; FLUIDS; FUEL CELLS; GASES; HALOGENATION; HYDROCARBONS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; PHYSICAL PROPERTIES; TESTING; 300503* - Fuel Cells- Materials, Components, & Auxiliaries; 300501 - Fuel Cells- Design & Development

Citation Formats

Brummer, S B, Foos, J, McHardy, J, McVeigh, J, Toland, D, and Turner, M. New electrolytes for direct methane fuel cells. Final report, January 10,1977-January 9, 1979. [Methanesulfonic acids]. United States: N. p., 1979. Web. doi:10.2172/5712244.
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]. United States. https://doi.org/10.2172/5712244
Brummer, S B, Foos, J, McHardy, J, McVeigh, J, Toland, D, and Turner, M. Tue . "New electrolytes for direct methane fuel cells. Final report, January 10,1977-January 9, 1979. [Methanesulfonic acids]". United States. https://doi.org/10.2172/5712244. https://www.osti.gov/servlets/purl/5712244.
@article{osti_5712244,
title = {New electrolytes for direct methane fuel cells. Final report, January 10,1977-January 9, 1979. [Methanesulfonic acids]},
author = {Brummer, S B and Foos, J and McHardy, J and McVeigh, J and Toland, D and Turner, M},
abstractNote = {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/.},
doi = {10.2172/5712244},
url = {https://www.osti.gov/biblio/5712244}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {5}
}