CsH5(PO4)2/quartz fiber thin membranes for intermediate temperature fuel cells and electrochemical synthesis of ammonia
- 300 Downloads
In this study, CsH5(PO4)2/quartz fiber thin membranes with thicknesses varying from 70 to 150 μm were prepared by a simple impregnation method and were tested as an electrolyte for fuel cell and electrolytic cell applications. The membranes consisted of a physical dispersion of CsH5(PO4)2 in the quartz fiber matrix. The crystalline structure and thermal behavior of CsH5(PO4)2 were not influenced by the quartz fiber. The membrane showed a high conductivity of 33 mS cm−1 at 180–250 °C under 30% H2O/Ar atmosphere. In addition, the membranes had area-specific resistances of 0.32 and 0.73 Ω cm2, for corresponding thicknesses of 70 and 150 μm, which are sufficiently low values compared with those of pellet-type electrolytes. The membrane showed stable conductivity at 220 °C under 30% H2O/Ar atmosphere for 20 h. A fuel cell assembled with the membrane exhibited an open-circuit voltage of 0.93 V and peak power densities of 105 and 72 mW cm−2, for corresponding thicknesses of 70 and 150 μm. In addition, ammonia was successfully synthesized from humidified hydrogen and nitrogen under atmospheric pressure in an electrolytic cell assembled with the membrane. An ammonia formation rate of 2.8 × 10−10 mol cm−2 s−1 and a Faradaic efficiency of 0.09% were obtained at 220 °C when the applied voltage was 0.05 V. With the increase of the applied voltage, both ammonia formation rate and Faradaic efficiency decreased rapidly.
KeywordsElectrolyte Membrane Intermediate temperature fuel cells Electrolysis Ammonia synthesis CsH5(PO4)2
This work was supported by CREST, Japan Science and Technology Agency (JST).
- 1.Toyota MC (2017) The 2017 Toyota Mirai fuel cell vehicle. https://ssl.toyota.com/mirai/fcv.html. Accessed 5 February 2017
- 2.JLPGA (2017) Home-use fuel cell (ENE-FARM). http://www.j-lpgas.gr.jp/en/appliances/index.html#ENE-FARM. Accessed 5 February 2017
- 32.Kikuchi R, Ogawa A, Matsuoka T, Takagaki A, Sugawara T, Oyama ST (2016) Interfacial conduction mechanism of cesium hydrogen phosphate and silicon pyrophosphate composite electrolytes for intermediate-temperature fuel cells. Solid State Ionics 285:160–164. doi: 10.1016/j.ssi.2015.10.008 CrossRefGoogle Scholar
- 39.Amar IA, Petit CTG, Lan R, Mann G, Tao SW (2014) Electrochemical synthesis of ammonia from wet nitrogen using La0.6Sr0.4FeO3−δ-Ce0.8Gd0.18Ca0.02O2−δ composite cathode. RSC Adv 4(36):18749-18754. doi: 10.1039/c4ra02090a
- 41.Fan LD, Zhang GQ, Chen MM, Wang CY, Di J, Zhu B (2012) Proton and oxygen ionic conductivity of doped ceria-carbonate composite by modified Wagner polarization. Int J Electrochem Sci 7(9):8420–8435Google Scholar
- 45.Amar IA, Lan R, Petit CTG, Tao S (2015) Electrochemical synthesis of ammonia using Fe3Mo3N catalyst and carbonate-oxide composite electrolyte. Int J Electrochem Sci 10(5):3757–3766Google Scholar
- 50.Patnaik P (2003) Handbook of inorganic chemicals. McGraw-Hill, New YorkGoogle Scholar