Performance and stability of proton conducting solid oxide fuel cells based on yttrium-doped barium cerate-zirconate thin-film electrolyte

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.jpowsour.2012.11.094Journal of Power Sources, 229, pp. 48-57, 2012-11-30 Performance and stability of proton conducting solid oxide fuel cells based on yttrium-doped barium cerate-zirconate thin-film electrolyte Yoo, Yeong; Lim, Nguon . The open circuit voltages were around 1.12-1.13 V at 600 C indicating negligible gas leakage or mixed conduction through the electrolyte. The maximum power density of 493 mW cm -2 was obtained at 600 C and 0.7 V under air as the oxidant gas and humid 75% H 2 in N 2 (2.76% H 2 O) as the fuel gas at a gas flow rate of 100 ml min -1. The area specific resistance of an anode supported button cell of BSCF-BCZY // BCZY // NiO-BCZY in fuel cell mode was about 0.46 cm 2 and in the electrolysis mode was 0.26 cm 2 at 600 °C, indicating efficient reversible SOFCs. The single cell performance was stable for over 600 h at 600 C under humid 75% H 2 in N 2 (2.76% H 2 O) as the fuel gas and air as the oxidant gas. The stability of BCZY electrolyte in water-containing atmospheres was investigated by exposing sintered BCZY pellets to humid air (2.76% H 2 O) at 200 C for 24 h or soaking them in boiling water for 3 h.

Effects of H2O and CO2on Electrochemical Behaviors of BSCF Cathode for Proton Conducting IT-SOFC

“…[7][8][9] In comparison, proton conducting oxides, many of which are perovskite-structured, offer higher ionic conductivity with low electronic transport number as well as lower activation energy at intermediate temperature. [10][11][12][13][14][15][16] As a result, they are regarded as the preferred electrolyte for IT-SOFC. 17 For IT-SOFC, the cathode process is generally regarded as the rate-limiting step due to its high activation energy compared to the electrolyte.…”

Enhanced durability of a proton conducting oxide fuel cell with a purified yttrium-doped barium zirconate-cerate electrolyte

“…A yttriumdoped barium zirconate-cerate (BaZr x Ce y Y 1ÀxÀy O 3Àd ) with a low Zr content (i.e., BaZr 0.1 Ce 0.7 Y 0.2 O 3Àd ) still decomposed when exposed to an atmosphere containing 3% CO 2 [19] [21]; however, more research is necessary to evaluate the long-term durability and performance of thin film cells with a BZCY electrolyte under fuel cell operation conditions. Slodczyk et al [22,23] have noted the formation of bariumcontaining secondary phases (carbonates, hydroxides, hydrates, etc.)…”

Synthesis and Evaluation of Ni Catalysts Supported on BaCe0.5Zr0.3−xY0.2NixO3−δ with Fused-Aggregate Network Structure for the Hydrogen Electrode of Solid Oxide Electrolysis Cell

“…The scaffold was obtained by the co-sintering procedure at 1050 °C, which was a much lower temperature than previous reports, with no impurity phases, particularly metallic Ni [20][21][22]. As seen in the cross-sectional images, the BCZYN scaffolds (x = 0 and 0.03) on BCZY(EL) (Figure 3a) also maintained the structure with open pores, both primary pores (<100 nm in diameter) and secondary pores (>100 nm), surrounded by the aggregates.…”

“…He and Rao reported a high electrolysis current density (0.83 A cm −2 at 1.5 V) at 700 • C by use of a thin BCZY electrolyte (thickness: 30 µm) [20,21]. Yoo also reported a high electrolysis current density (1.1 A cm −2 at 1.3 V) by use of a thin BCZY electrolyte (thickness: 10-15 µm) [22].…”

“…In the case of the proton-conducting SOECs, composites of Ni and proton-conducting electrolytes are also typically used as the hydrogen electrode [20][21][22]30]. In the present study, we have sought to apply the DL electrode (CL: nanometer-sized Ni dispersed on porous mixed proton-electron conducting (MPEC) oxide; CCL: composite of Ni and MPEC oxide) to the proton-conducting SOEC, based on the electrode design concept described above, as shown in Figure 1.…”