Promotional effects of oxygen-containing additives on ammonia borane dehydrogenation for polymer electrolyte membrane fuel cell applications

Shinyoung Yeo, Yongmin Kim, Jin Hee Lee, Kibeom Kim, Jong Hyun Jang, Seong Ahn Hong, SukWoo Nam, Chang Won Yoon

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

To develop continuous hydrogen generators utilizing ammonia borane (AB), one of the extensively studied chemical hydrogen storage material for applications in polymer electrolyte membrane fuel cells (PEMFCs), various types of oxygen-containing compounds such as 18-crown-6, 18-crown-6 derivatives, glycols, and polyethylene glycols were examined as chemical additives to enhance the H2-release properties of AB. The rate and extent of AB dehydrogenation with these promoters were found to increase considerably at temperatures ranging from 85 °C to 125 °C; in particular, a mixture of AB and either 18-crown-6 or tetraethylene glycol afforded a material-based hydrogen storage capacity of >9.5 wt%. In situ Fourier transform infrared (FT-IR) and solid-state nuclear magnetic resonance (NMR) spectroscopic studies were conducted to identify gaseous byproducts potentially detrimental to a PEMFC. Density functional theory (DFT) studies demonstrated that the additives could interact with AB via hydrogen bonding between oxygen atoms of a promoter and N-H of AB, which could ultimately facilitate AB dehydrogenation.

Original languageEnglish
Pages (from-to)21786-21795
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number36
DOIs
Publication statusPublished - 2014 Dec 1

Keywords

  • Ammonia borane
  • Chemical hydride
  • Hydrogen storage
  • Polyethers
  • Polymer electrolyte membrane fuel cell (PEMFC)
  • Promoter

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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