Promotion of oxygen reduction and evolution by applying a nanoengineered hybrid catalyst on cobalt free electrodes for solid oxide cells

Tong, Xiaofeng; Xu, Yu; Tripković, Đorđije; Hendriksen, Peter Vang; Kiebach, Ragnar; Chen, Ming

doi:10.1039/d0ta02979c

Cited by 29 publications

(13 citation statements)

References 57 publications

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“…The perovskite structure material incorporates H 2 O for protonation [25], and cobalt plays an essential role in cathode catalytic activity [26,27]. However, issues such as cobalt evaporation at high temperatures and thermal mismatch between the cobalt-containing cathode and the electrolyte [28,29] have not been adequately addressed till now. As a result, the development of high-performance cathodes free of cobalt is of interest to many researchers.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Zhang

Yin

et al. 2022

Sci. China Mater.

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Sc-doped Sr 2 Fe 1.5 Mo 0.5 O 6−δ (SFMSc) was successfully synthesized by partially substituting Mo in Sr 2 Fe 1.5 -Mo 0.5 O 6−δ (SFM) with Sc, resulting in a higher proton diffusion rate in the resultant SFMSc sample. Theoretical calculations showed that doping Sc into SFM lowered the oxygen vacancy formation energy, reduced the energy barrier for proton migration in the oxide, and increased the catalytic activity for oxygen reduction reaction. Next, a proton-conducting solid oxide fuel cell (H-SOFC) with a single-phase SFMSc cathode demonstrated significantly higher cell performance than that of cell based on an Sc-free SFM cathode, achieving 1258 mW cm −2 at 700°C. The performance also outperformed that of many other H-SOFCs based on single-phase cobalt-free cathodes. Furthermore, no trade-off between fuel cell performance and material stability was observed. The SFMSc material demonstrated good stability in both the CO 2 -containing atmosphere and the fuel cell application. The combination of high performance and outstanding stability suggests that SFMSc is an excellent cathode material for H-SOFCs.

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Section: Introductionmentioning

confidence: 99%

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Zhang

Yin

et al. 2022

Sci. China Mater.

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“…Currently, solution-based infiltration is the promising method of surface structural modifications, which is the most facile route to fabricate a cathode in the lower temperature range to further improve the cell performance. − Particularly, infiltrated CFL is a smart method to accelerate the kinetics of ORR due to combining the advantages of the above-mentioned surface structure modifications. − An infiltrating process is flexible, which can not only produce CFL with a single material, − but also construct a nanostructured composite CFL with two or more functional materials. − These functional materials include MIEC, ionic conductor, and even a combination of electrocatalysts. ,− In general, the porous scaffold possesses superior electrical conductivity, whereas the infiltrated covering has very good durability and remarkable catalytic activity for the oxygen reduction reaction . For example, Ishfaq et al reported a customized nanofilm of Sm 0.5 Sr 0.5 CoO 3‑δ (SSC) catalyst on a LSC electrode via an optimized drying rate, showing 2× increments in cell performance and superior long-term stability compared to the blank LSC cathode .…”

Section: Introductionmentioning

confidence: 55%

Boosting and Robust Multifunction Cathode Layer for Solid Oxide Fuel Cells

Zheng

Jing

et al. 2022

ACS Sustainable Chem. Eng.

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Designing an efficient cathode and an accelerating sluggish oxygen reduction reaction (ORR) process are crucial to enhancing electrochemical outputs for solid oxide fuel cells (SOFCs). A novel multifunction layer (MFL) cathode that combines the Gd 0.2 Ce 0.8 O 2−δ (GDC) interlayer with a La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) cathode functional layer is reported. After precisely controlling the concentration of an infiltration precursor solution, discrete and filmy LSCF on the GDC scaffold (MFL-D and MFL-F) can be prepared. Compared with the discrete-coating of LSCF (MFL-D), the film-like coating of LSCF (MFL-F) exhibits a lower initial polarization impedance of 0.093 Ω cm 2 at 750 °C. The as-obtained SOFCs produce an enhanced peak power density of 0.93 W cm −2 and have successfully been operated at 0.5 A cm −2 for 400 h with a voltage degradation of only 16 mV. Oxygen ion transport model of the MFL-F is constructed and discussed. This work provides an important insight into designing efficient cathode for SOFCs.

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“…In the DRT plots shown in Figure c, all of the peaks demonstrated an increase in magnitude as the temperature decreased. Additionally, their characteristic frequencies shifted toward lower values, indicating a thermally activated behavior . This observation suggests that none of the peaks were exclusively associated with gas diffusion processes, which exhibited only a slight temperature dependence.…”

Section: Resultsmentioning

confidence: 99%

Scalable Fabrication and Resistance Deconvolution of Ni/BCZY Fuel Electrode-Supported Protonic Ceramic Cells

Tong,

Yuan,

et al. 2023

Energy Fuels

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Protonic ceramic cells (PCCs) are emerging as promising technologies for energy conversion at intermediate temperatures (400−700 °C). Here, we present a comprehensive study on the scalable fabrication and resistance deconvolution of Ni/BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ (BCZY) fuel electrode-supported PCCs featuring triple-conducting PrNi 0.5 Co 0.5 O 3-δ (PNC) oxygen electrodes. The Ni/BCZY|BCZY half cells are fabricated using commercially relevant tape-casting methods in dimensions of 18 × 18 cm 2 before sintering. The sintering process of both the half cells and the PNC oxygen electrodes is optimized by examining the influence of sintering temperature on cell microstructure. Even a deviation of 50 °C in the sintering temperature of the PNC electrode can result in a remarkable 5-fold difference in cell performance. Through comprehensive analysis of electrochemical impedance spectroscopy data obtained under various gas supply and operating temperature conditions, different electrode processes are successfully identified, and their respective contributions to the overall resistance of the cell are quantified. The results reveal that the resistance associated with the PNC oxygen electrode processes primarily governs the total polarization resistance (R p ), while the resistance associated with the Ni/BCZY fuel electrode is considerably smaller. During short-term durability tests, the cell undergoes continuous activation. The changes in resistance associated with different electrode processes indicate that the major activation of the cell is contributed by the PNC oxygen electrode. After durability tests, the resistance associated with reactions occurring on the Ni/BCZY fuel electrode contributes the highest percentage to the total R p . Postmortem analysis is performed on the cell after the durability tests. Our work provides insights to guide the design and optimization of PCCs.

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Promotion of oxygen reduction and evolution by applying a nanoengineered hybrid catalyst on cobalt free electrodes for solid oxide cells

Abstract: A remarkable enhancement of electro-catalytic activity of a cobalt-free (La0.6Sr0.4)0.98FeO3−δ electrode by applying a nanoengineered hybrid catalyst coating via co-infiltration.

Cited by 29 publications

References 57 publications

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Tailoring Sr2Fe1.5Mo0.5O6−δ with Sc as a new single-phase cathode for proton-conducting solid oxide fuel cells

Boosting and Robust Multifunction Cathode Layer for Solid Oxide Fuel Cells

Scalable Fabrication and Resistance Deconvolution of Ni/BCZY Fuel Electrode-Supported Protonic Ceramic Cells

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