The impact of porosity, pH(2) and pH(2)O on the polarisation resistance of Ni-BaZr0.85Y0.15P3-delta cermet anodes for Protonic Ceramic Fuel Cells (PCFCs)
authors Nasani, N; Ramasamy, D; Brandao, AD; Yaremchenko, AA; Fagg, DP
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Protonic ceramic fuel cells (PCFC); Porosity; Cermet anode; Polarisation resistance; Barium zirconate
keywords CONDUCTING ELECTROLYTE; PORE-FORMER; SOFCS; MICROSTRUCTURE; PERFORMANCE; NI; OXIDATION; POWDERS; PHASE
abstract The effect of porosity and atmosphere on the polarisation resistance of Ni-BZY cermet anodes for protonic ceramic fuel cells (PCFCs) was investigated using electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The level of porosity was adjusted by the use of differing amounts of starch porogen. The total polarisation resistance of the cermet anode (Rp) generally showed an increase with increasing porosity. The high frequency polarisation resistance (R2) was shown to have low atmosphere dependence but presented a strong correlation to microstructural variations. In contrast, the low frequency polarisation resistance (R3) was shown to have a low dependence on humidity but demonstrated a strong negative dependence on pH(2) with a value of unity. Subsequent discussion relates the lower frequency response to the dissociative adsorption of H2 on the anode surface. The present study highlights that porogens are not required for peak performance in PCFC anodes under standard operating conditions, a result contrary to that of their oxide-ion conducting cermet counterparts. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2014
volume 39
issue 36
beginning page 21231
ending page 21241
digital object identifier (doi) 10.1016/j.ijhydene.2014.10.093
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000347576200036
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