Jeong, Yeon Hun Jung, Ju Hae Choi, Euiji Han, Seungyoon Begley, Alina Irene Yoo, Sung Jong Jang, Jong Hyun Kim, Hyoung-Jtihn Nam, Suk Woo Lee, Kwan-Young Kim, Jin Young 2024-01-20T05:30:55Z 2024-01-20T05:30:55Z 2021-09-03 2015-12-20 0378-7753 https://pubs.kist.re.kr/handle/201004/124615 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. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER HIGH-TEMPERATURE PEMFC ELECTROLYTE MEMBRANES PERFORMANCE Colorimetric determination of phosphoric acid leakage for phosphoric acid-doped polybenzimidazole membrane fuel cell applications Article 10.1016/j.jpowsour.2015.09.015 1 JOURNAL OF POWER SOURCES, v.299, pp.480 - 484 JOURNAL OF POWER SOURCES 299 480 484 scie scopus 000363907400059 2-s2.0-84942092729 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article HIGH-TEMPERATURE PEMFC ELECTROLYTE MEMBRANES PERFORMANCE Molybdenum blue method Phosphoric acid leakage Phosphoric acid-doped polybenzimidazole membrane High temperature proton exchange membrane fuel cells