CsH2PO4/Epoxy Composite Electrolytes for Intermediate Temperature Fuel Cells. (1st July 2015)

• Record Type: Journal Article
• Authors: Qing, Geletu; Kikuchi, Ryuji; Takagaki, Atsushi; Sugawara, Takashi; Oyama, Shigeo Ted
• Is Part Of: Electrochimica acta. Volume 169(2015)
• Page Start: 219
• Page End: 226
• Publication Date: 2015-07-01
• Subjects: Intermediate temperature fuel cells -- CsH2PO4 -- Epoxy -- Composite electrolyte -- Proton conduction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.04.089
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this study CsH2 PO4 /epoxy composite electrolytes were prepared by dispersing CsH2 PO4 particles, whose sizes were smaller than 10 μm, in a low-viscosity heat-resistant epoxy resin. The epoxy polymerization was promoted by thermal curing. The composite electrolyte consisted of a physical dispersion of CsH2 PO4 particles in the cross-linked epoxy matrix. The polymerized epoxy showed a high thermal stability with no weight loss or phase transformation up to 290 °C. The composite electrolyte with 80 wt% CsH2 PO4 showed a high conductivity of 11 mS cm −1 at 259 °C under 30% H2 O/Ar atmosphere as well as a flexural strength of 7.3 MPa at room temperature. The composite electrolyte with 80 wt% CsH2 PO4 showed a stable conductivity at 259 °C under 30% H2 O/Ar atmosphere for 50 h. A fuel cell assembled with this electrolyte exhibited an open circuit voltage of 0.95 V and a peak power density of 38 mW cm −2 . In addition, the fuel cell produced an output voltage higher than 0.44 V during a 6 h test under an output current density of 70 mA cm −2 with humidified H2 as the fuel and humidified O2 as the oxidant.