Remarkable ionic conductivity and catalytic activity in ceramic nanocomposite fuel cells. (12th July 2018)

• Record Type: Journal Article
• Authors: Asghar, M.I.; Jouttijärvi, S.; Jokiranta, R.; Lund, P.D.
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 28(2018)
• Page Start: 12892
• Page End: 12899
• Publication Date: 2018-07-12
• Subjects: Carbonate -- Catalytic activity -- Ceramic -- Fuel cell -- Ionic conductivity -- Nanocomposite; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.05.045
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Although ceramic nanocomposite fuel cells (CNFCs) have attracted the attention of the fuel cell community due to their low operating temperature (<600 °C), often the performance of the cells is limited due to the low ionic conductivity of the electrolyte and the sluggish reaction kinetics at the electrodes. This results in high ohmic and charge transfer losses in the cell performance. Here we report nanocomposite electrolyte (GDC-NLC) and electrodes (NiO-GDC-NLC and LSCF-GDC-NLC as anode and cathode respectively) with enhanced ionic conductivity and catalytic activity respectively, which significantly improve the ionic transport in the electrolyte layer (ohmic losses ≈ 0.23 Ω cm 2 ) and the reaction kinetics at the electrodes (polarization losses ≈ 0.63 Ω cm 2 ). Microstructural and phase changes in the materials were characterized with X-ray diffraction, scanning electron microscopy, and differential scanning calorimetry to understand the mechanisms in the cells. Our button fuel cell produced an outstanding performance of 1.02 W/cm 2 at 550 °C. Highlights: A nanocomposite electrolyte with high ionic conductivity was synthesized. Detailed characterization is performed to study its properties. High performance nanocomposite fuel cells produced 1.02 W/cm 2 at 550 °C.