Preparation of BaZr_0.1Ce_0.7Y_0.2O_3–δ Based Solid Oxide Fuel Cells with Anode Functional Layers by Tape Casting

Abstract

Solid oxide fuel cells (SOFCs) based on the proton conducting BaZr0.1Ce0.7Y0.2O3–δ (BZCY) electrolyte were prepared and tested in 500–700 °C using humidified H2 as fuel (100 cm3 min–1 with 3% H2O) and dry O2 (50 cm3 min–1) as oxidant. Thin NiO‐BZCY anode functional layers (AFL) with 0, 5, 10 and 15 wt.% carbon pore former were inserted between the NiO‐BZCY anode and BZCY electrolyte to enhance the cell performance. The anode/AFL/BZCY half cells were prepared by tape casting and co‐sintering (1,300 °C/8 h), while the Sm0.5Sr0.5CoO3–δ (SSC) cathodes were prepared by thermal spray deposition. Well adhered planar SOFCs were obtained and the test results indicated that the SOFC with an AFL containing 10 wt.% pore former content showed the best performance: area specific resistance as low as 0.39 Ω cm2 and peak power density as high as 0.863 W cm–2 were obtained at 700 °C. High open circuit voltages ranging from 1.00 to 1.12 V in 700–500 °C also indicated negligible leakage of fuel gas through the electrolyte.

Fabrication of multi-layered structures for proton conducting ceramic cells

“…In ref. 20 a very high Ce content of 70 mol% was used (critical with respect to long-term stability, see below) many tape-cast layers were then laminated (unpractical for upscaling), and the cell size was only 3.3 cm 2 , which limits the applicability of such an approach. In ref.…”

Electrochemical performance of spin coated dense BaZr0.80Y0.16Zn0.04O3-δ membranes

“…Several preparation methods have been exploited for the preparation of thin and thick proton conducting membrane such as tape casting [25], electrophoretic deposition (EPD) [26,27], pulsed laser deposition (PLD) [28], co-pressing [29,30], spray coating [31], and slurry spin coating [32]. Among them, slurry spin coating is a simple and cost effective method that allows the control of the electrolytes thickness by varying the coating cycles.…”

Evaluation of thin film fuel cells with Zr-rich BaZrxCe0.8−xY0.2O3−δ electrolytes (x ≥ 0.4) fabricated by a single-step reactive sintering method

“…R b À1 obeys linear Arrhenius-type relationship, providing the activation energies of proton conduction of 0.26, 0.33, 0.34, and 0.22 eV for BZCY4, BZCY6, BZCY7, and BZY cells, respectively, and these energies are similar to the corresponding energies reported elsewhere. [24][25][26][27]31 In all electrolyte cells, the fractions of R b to total resistances (R b + R p ) account for 65-80% at 600 C, indicating that the electrolyte resistances involve the major part of the voltage losses. R b values of BZCY7 and BZY electrolyte lms are one order of magnitude higher than those of BZCY4 and BZCY6, which is due to large grain boundary resistances; the grain boundary volumes of the former are much larger than those of the latter (Fig.…”