Effect of calcination temperature on oxidation state of cobalt in calcium cobaltite and relevant performance as intermediate-temperature solid oxide fuel cell cathodes

Yu, Shancheng; He, Shoucheng; Chen, Han; Guo, Lucun

doi:10.1016/j.jpowsour.2015.01.150

Cited by 51 publications

(11 citation statements)

References 50 publications

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“…At 5 mA/cm², C349 presented a potential of 0.89 V against 1.48 V for GC, similar to that found for other OER catalysts listed in Table 1. The mixed Co 4+ /Co 3+ redox couple highlighted by the XPS could be the likely source of the noted catalysis of the OER [14]. Pt-wire (measuring 0.63 V) was better than C349 and CG for the OER, as expected.…”

Section: Resultssupporting

confidence: 66%

Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

et al. 2018

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Ca 3 Co 4 O 9 (C349) nanofibres were obtained by Solution Blow Spinning (SBS) and evaluated as electrocatalysts for Oxygen Reduction and Oxygen Evolution Reactions (ORR and OER). Calcined nanofibres were characterised in terms of structural, morphological and electrochemical features.Results showed that catalytic activity of C349 nanofibres for ORR/OER is in line with literature data for carbon-related materials. The areal capacitance is much better than that of TiO 2 nanotubes.

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Section: Resultssupporting

confidence: 66%

Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

et al. 2018

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“…In an oxidizing atmosphere, cobalt cation in an oxide possesses the mixed valence state of +3/+4. 32,33 When Ce 4+ sites are substituted by Co 3+ , oxygen vacancies are created for the compensation of a charge neutrality in BCCY100x as follows.…”

Section: Resultsmentioning

confidence: 99%

La0.6Sr0.4Co0.2Fe0.8O3−δ–Ba(Ce,Co,Y)O3−δ Composite Cathodes for Proton-conducting Ceramic Fuel Cells

et al. 2020

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In this study, the applicability of Ba(Ce,Co,Y)O 3−δ (BCCY) for a cathode of proton-conducting ceramic fuel cells was investigated. The electrical conductivity and transference number of BCCY were significantly affected by a cobalt content in the oxide. It was found that this material showed a mixed conduction of proton, oxide ion, and electron. The addition of cobalt into Ba(Ce,Y)O 3−δ mainly increased the electronic conductivity of materials. Composite electrodes with an optimum composition of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF)-BaCe 0.7 Co 0.2 Y 0.1 O 3−δ (50:50 wt.%) exhibited lower polarization for the symmetrical cell test with a BaCe 0.8 Y 0.2 O 3−δ electrolyte in 6.5% humidified oxygen atmosphere, as compared with La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) itself and LSCF-BaCe 0.9 Y 0.1 O 3−δ (50:50 wt.%) composite electrodes. The power generation test was performed at 600°C-700°C using a BaCe 0.8 Y 0.2 O 3−δ electrolyte-supported single cell employing a LSCF-BaCe 0.7 Co 0.2 Y 0.1 O 3−δ (50:50 wt.%) composite cathode, upon feeding 3% humidified hydrogen and pure oxygen to the anode and cathode, respectively. The cell with a LSCF-BaCe 0.7 Co 0.2 Y 0.1 O 3−δ (50:50 wt.%) composite cathode exhibited much higher performance than that with a LSCF electrode. Consequently, the introduction of cobalt into Ba(Ce,Y)O 3−δ was an effective strategy for an improvement in an oxygen reduction reaction activity of a cathode material.

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“…NiO-SDC (weight ratio of 6:4) was employed as the anode material to form electrolyte-supported fuel cells. The synthesis process was reported in our previous paper [23].…”

Section: Sample Preparationmentioning

confidence: 99%

“…The Co 2p 3/2 peaks are deconvoluted into three peaks in Fig. 4b-d, and the peaks corresponding to the higher, medium and lower binding energy are attributed to Co 2+ , Co 3+ and Co 4+ , respectively [23,33].…”

Section: Comentioning

confidence: 99%

Investigation of La1−Sm−Sr CoO3−δ cathode for intermediate temperature solid oxide fuel cells

Chen

et al. 2017

Journal of Power Sources

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La 1-x Sm x-y Sr y CoO 3-G (LSSC; x=0.475, 0.650, 0.825, y=0.35, 0.40, 0.45) compounds, which have the same compositions as the La 0.7 Sr 0.3 CoO 3-G (LSC) and Sm 0.5 Sr 0.5 CoO 3-G (SSC) mixture (corresponding mole ratio is 3:1, 1:1 and 1:3, respectively), are synthesized through a conventional solid-state reaction and characterized by X-ray diffraction, thermal expansion coefficient, X-ray photoelectron spectrometer and electrical conductivity measurement, as well as the electrochemical impedance spectra and single cell performance measurement. Interestingly, the experimental results reveal that with the linear increase of y in LSSC, the conductivity of the corresponding samples does not alter linearly but reaches a peak when y=0.35, namely, the maximum electrical conductivity enhancing from 2148 S cm-1 (LSC, y=0.30) and 1802 S cm-1 (SSC, y=0.50) to 2750 S cm-1 (y=0.35). In addition, this turning point coincidently corresponds to the structure transition from hexagonal (y=0.35) to orthorhombic (y=0.40). Furthermore, comparing with LSC and SSC, the cathode polarization resistance (R P) decreases by about 50% and 38%, respectively, after employing the LSSC (y=0.40) compound as cathode at 800 o C and 0.21 atm p(O 2), which also leads to an increment

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Effect of calcination temperature on oxidation state of cobalt in calcium cobaltite and relevant performance as intermediate-temperature solid oxide fuel cell cathodes

Cited by 51 publications

References 50 publications

Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3−</sub><i><sub>δ</sub></i>–Ba(Ce,Co,Y)O<sub>3−</sub><i><sub>δ</sub></i> Composite Cathodes for Proton-conducting Ceramic Fuel Cells

Investigation of La1−Sm−Sr CoO3−δ cathode for intermediate temperature solid oxide fuel cells

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