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| Hauptseite > Publikationsdatenbank > Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Eelctrolyte Membranes > print |
| Hauptseite > Publikationsdatenbank > Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Eelctrolyte Membranes > print |
| 001 | 848044 | ||
| 005 | 20240712113232.0 | ||
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| 100 | 1 | _ | |a Becker, Hans |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Eelctrolyte Membranes |
| 260 | _ | _ | |a Pennington, NJ |c 2018 |b Electrochemical Soc. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a The passage of an electrical current through phosphoric acid doped polymer membranes involves parasitic migration of the acid, which imposes a critical issue for long-term operation of the high temperature polymer electrolyte membranes fuel cell (HT-PEMFC). To elucidate the phenomenon, a three-layered membrane is constructed with embedded micro reference electrodes to measure phosphoric acid redistribution in a polybenzimidazole based membrane. Under a constant load, a concentration gradient develops due to the acid migration, which drives the back diffusion of the acid and eventually reaches a steady state between migration and diffusion. The acid gradient is measured as a difference in local ohmic resistances of the anode- and cathode-layer membranes by electrochemical impedance spectroscopy. The phosphoric acid diffusion coefficient through the acid doped membrane is about 10−11 m2 s−1, at least one order of magnitude lower than that of aqueous phosphoric acid solutions. The anion (H2PO4−) transference number is found to range up to 4% depending on current density, temperature and atmospheric humidity of the cell, implying that careful control of the operating parameters is needed in order to suppress the vehicular proton conduction as a degradation mitigation strategy. |
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| 700 | 1 | _ | |a Reimer, Uwe |0 P:(DE-Juel1)6697 |b 1 |e Corresponding author |
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| 700 | 1 | _ | |a Cleemann, Lars N. |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Jensen, Jens Oluf |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Lehnert, Werner |0 P:(DE-Juel1)129883 |b 5 |
| 700 | 1 | _ | |a Li, Qingfeng |0 P:(DE-HGF)0 |b 6 |e Corresponding author |
| 773 | _ | _ | |a 10.1149/2.1201810jes |g Vol. 165, no. 10, p. F863 - F869 |0 PERI:(DE-600)2002179-3 |n 10 |p F863 - F869 |t Journal of the Electrochemical Society |v 165 |y 2018 |x 0013-4651 |
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