On-board hydrogen storage and production: An application of ammonia electrolysis

Bryan K. Boggs, Gerardine G. Botte

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

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 H2 is required for ammonia electrolysis and 33 Wh g-1 H2 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 H2 while maintaining H2 production equivalent to consumption.

Original languageEnglish
Pages (from-to)573-581
Number of pages9
JournalJournal of Power Sources
Volume192
Issue number2
DOIs
StatePublished - Jul 15 2009

Keywords

  • Ammonia electrolysis
  • Ammonia electrolytic cell
  • Fuel cells
  • Hydrogen storage
  • On-board hydrogen production

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