Colorimetric determination of phosphoric acid leakage for phosphoric acid-doped polybenzimidazole membrane fuel cell applications

Yeon Hun Jeong, Ju Hae Jung, Euiji Choi, Seungyoon Han, Alina Irene Begley, Sung Jong Yoo, Jong Hyun Jang, Hyoung Juhn Kim, SukWoo Nam, Kwan Young Lee, Jin Young Kim

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5 Citations (Scopus)


A simple and precise colorimetric method for analyzing phosphoric acid leakage in phosphoric acid-doped polybenzimidazole membrane fuel cells is described. The developed method is based on the colorimetric determination from a rapid formation of molybdenum blue color by the reduction reaction of molybdate ions in the presence of phosphoric acid in the acidic medium. The color is stable up to a few months and can be used for the sensitive and accurate detection of phosphoric acid electrolyte which is discharged from the fuel cell during operation. Tests with a wide concentration range of phosphate compounds showed that it permits determination of phosphoric acid up to nanogram quantities. The developed detection method assists monitoring the phosphoric acid contents and developing stable operation strategies of fuel cells.

Original languageEnglish
Pages (from-to)480-484
Number of pages5
JournalJournal of Power Sources
Publication statusPublished - 2015 Dec 20



  • High temperature proton exchange membrane fuel cells
  • Molybdenum blue method
  • Phosphoric acid leakage
  • Phosphoric acid-doped polybenzimidazole membrane

ASJC Scopus subject areas

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

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