Journal
JOURNAL OF POWER SOURCES
Volume 192, Issue 2, Pages 573-581Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.03.018
Keywords
Ammonia electrolysis; Ammonia electrolytic cell; On-board hydrogen production; Hydrogen storage; Fuel cells
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On-board hydrogen storage and production via ammonia electrolysis was evaluated to determine whether the process was feasible using galvanostatic studies between an ammonia electrolytic cell (AEC) and a breathable proton exchange membrane fuel cell (PEMFC). Hydrogen-dense liquid ammonia stored at ambient temperature and pressure is an excellent source for hydrogen storage. This hydrogen is released from ammonia through electrolysis, which theoretically consumes 95% less energy than water electrolysis; 1.55 Wh g(-1) H-2 is required for ammonia electrolysis and 33 Wh g(-1) H-2 for water electrolysis. An ammonia electrolytic cell (AEC), comprised of carbon fiber paper (CFP) electrodes supported by Ti foil and deposited with Pt-Ir, was designed and constructed for electrolyzing an alkaline ammonia solution. Hydrogen from the cathode compartment of the AEC was fed to a polymer exchange membrane fuel cell (PEMFC). In terms of electric energy. input to the AEC was less than the output from the PEMFC yielding net electrical energies as high as 9.7 +/- 1.1 Wh g(-1) H-2 while maintaining H-2 production equivalent to consumption. (C) 2009 Elsevier B.V. All rights reserved.
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