Anode fabrication for solid oxide fuel cells: Electroless and electrodeposition of nickel and silver into doped ceria scaffolds

作者：Jamil Zadariana; Ruiz Trejo Enrique; Boldrin Paul; Brandon Nigel P

来源：International Journal of Hydrogen Energy, 2016, 41(22): 9627-9637.

DOI：10.1016/j.lihydene.2016.04.061

• Solid oxide fuel cell
• Electroless
• Electrodeposition
• Anode fabrication
• Ni/GDC

A novel fabrication method using electroless and electrodeposited Ni/Ag/GDC for SOFC anodes is presented. First a porous Ce0.9Gd0.1O2-x (GDC) scaffold was deposited on a YSZ electrolyte by screen printing and sintering. The scaffold was then metallized with silver using Tollens' reaction, followed by electrodeposition of nickel from a Watt's bath. The electrodes (Ni/Ag/GDC) were tested in both symmetrical and fuel cell configurations. The microstructures of the Ni/Ag/GDC anodes were analyzed using scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX). Nano-particles of Ni formed in the porous GDC scaffold provided triple phase boundaries (TPB). The electronic conductivity of the Ni/Ag/GDC (3.5/24.7/71.8 vol%) electrode was good even at relatively low Ni volume fractions. The electrochemical performance was examined in different concentrations of humidified hydrogen (3% H2O) and over a range of temperatures (600-750 degrees C). The total area specific resistance (ASR) of the anode at 750 degrees C in humidified 97 vol% H2 was 1.12 ohm cm(2), with low-frequency polarization (R_l) as the largest contributor. The electrodes were successfully integrated into a fuel cell and operated in both H-2 and syngas.

• 出版日期2016-6-15