Investigation of hydrogen production from boron compounds for pem fuel cells |
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| Affiliation: | 1. Mechanical Engineering Department, Nigde University, Nigde, Turkey;2. Energy Division, Mechanical Engineering Department, Nigde University, Nigde, Turkey;3. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ont., Canada L1H 7K4;1. Istanbul Technical University, Faculty of Civil Engineering, Department of Hydraulics, Maslak 34469, Istanbul, Turkey;2. Yildiz Technical University, Faculty of Civil Engineering, Department of Hydraulics, Davutpasa 34220, Istanbul, Turkey;3. Turkish Water Foundation, Aksaray 34134, Istanbul, Turkey;1. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Universite de Montpellier, Place E. Bataillon, F-34095, Montpellier, France;2. Laboratoire des Multimatériaux et Interfaces, Université Lyon 1, CNRS, UMR 5615, 43 Boulevard du 11 Novembre 1918, F-69622 Villeurbanne, France;3. Institute for Advanced Materials Research, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, 739-8521, Japan;4. Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, 739-8521, Japan;1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China;1. Department of Physics, Himachal Pradesh University, Shimla 171005, India;2. Department of Applied Sciences, Shoolini University, Bajhol, Solan, India;3. CSIR – National Physical Laboratory, Dr. K. S. Krishnan Road, Pusa, New Delhi, India;4. Department of Physics and Computer Science, Dayalbagh Educational Institute, Agra, India;5. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh, Saudi Arabia |
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| Abstract: | This paper presents a comprehensive study of hydrogen production from sodium borohydride (NaBH4), which is synthesized from sodium tetraborate (Na2B4O7) decomposition, for proton exchange membrane (PEM) fuel cells. For this purpose, Na2B4O7 decomposition reaction at 450–500 °C under hydrogen atmosphere and NaBH4 decomposition reaction at 25–40 °C under atmospheric pressure are selected as a common temperature range in practice, and the inlet molar quantities of Na2B4O7 are chosen from 1 to 6 mol with 0.5 mol interval as well. In order to form NaBH4 solution with 7.5 wt.% NaBH4, 1 wt.% NaOH, 91.5 wt.% H2O, the molar quantities of NaBH4 are determined. For a PEM fuel cell operation, the required hydrogen production rates are estimated depending on 60, 65, 70 and 75 g of catalyst used in the NaBH4 solution at 25, 32.5 and 40 °C, respectively. It is concluded that the highest rate of hydrogen production per unit area from NaBH4 solution at 40 °C is found to be 3.834 × 10−5 g H2 s−1 cm−2 for 75 g catalyst. Utilizing 80% of this hydrogen production, the maximum amounts of power generation from a PEM fuel cell per unit area at 80 °C under 5 atm are estimated as 1.121 W cm−2 for 0.016 cm by utilizing hydrogen from 75 g catalyst assisted NaBH4 solution at 40 °C. |
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