A novel, easily synthesized, anhydrous derivative of phosphoric acid for use in electrolyte with phosphoric acid-based fuel cells

Younes Ansari, Telpriore G. Tucker, Charles Angell

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We build on the success of phosphoric acid as a fuel cell electrolyte, by designing a variant of the molecular acid that provides increased temperature range without sacrifice of high temperature conductivity or open circuit voltage. This is achieved by introduction of a hybrid component, based on silicon coordination of phosphate groups, which prevents decomposition or water loss to 250 °C, while enhancing free proton motion. We report conductivity studies to 285 °C and full H2/O2cell polarization curves to 226 °C with careful monitoring of fuel consumption. The current efficiency we report (current density per unit of fuel supplied per sec) is as high as the highest on record. A power density of 184 mW cm-2 is achieved at 226 °C with hydrogen flow rate of 4.1 ml min-1.

Original languageEnglish (US)
Pages (from-to)47-51
Number of pages5
JournalJournal of Power Sources
Volume237
DOIs
StatePublished - Apr 8 2013

Keywords

  • Anhydrous derivative of phosphoric acid
  • Electrolyte
  • Fuel cells
  • High current efficiency
  • Phosphoric acid-based fuel cells
  • Silicophosphoric acid

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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