Cation deficiency enabled fast oxygen reduction reaction for a novel SOFC cathode with promoted CO2 tolerance

Ding, Xifeng; Gao, Zhipeng; Ding, Dong; Zhao, Xinyu; Hou, Huaiyu; Zhang, Shihua; Yuan, Guoliang

doi:10.1016/j.apcatb.2018.10.075

Cited by 116 publications

(50 citation statements)

References 61 publications

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“…Polarization resistances (Rp) at high frequency are attributed to charge transfer processes and Rp at low frequency are attributed to oxygen surface exchange process. [26][27][28] The plot was dominated by a semicircle which was attributed to the surface oxygen reduction reaction on the electrode. The cell with LSC nanofibers displays smaller Rp than LSC powder at same experimental conditions.…”

Section: Electrocatalytic Activity and Stabilitymentioning

confidence: 99%

Enhancing the Intrinsic Activity and Stability of Perovskite Cobaltite at Elevated Temperature Through Surface Stress

Zhou

Liu

et al. 2021

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SOFC/SOEC) functioning at elevated temperature, [1][2][3][4] electrochemical water splitting in aqueous solution, [5][6][7] and advanced oxidation processes for water treatment. [8] However, perovskite-based materials synthesized via the conventional solid-state reaction methods typically show large particle size due to high sintering temperature, thus resulting in poor catalytic performance.To enhance the device performance, various techniques have been developed to synthesize perovskite-based oxide catalysts with nanostructure. [9][10][11][12][13][14][15][16] For instance, Chen et al. [17] synthesized a hierarchically porous nano network (Sm 0.5 Sr 0.5 CoO 3 -Gd 0.1 Ce 0.9 O 2-δ ) as a cathode of SOFC, which strongly enhanced the power density and stability of the devices. Similarly, Ahn et al. [13] reported that SOFC with Sm 0.5 Sr 0.5 CoO 3-δ nanofiber-based composite cathode showed a significantly lower area specific resistance compared to one with SSC powder cathode. Zhao et al. observed strongly boosted oxygen evolution reaction (OER) activity of PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) nanotube in alkaline solution as they shrank the material size to tens of nanometers. [14] Although all these works demonstrate that nanostructure engineering can be an effective approach for improving the catalytic activity of perovskite-based oxide, the mechanism for the enhancement is still not fully understood. In most cases, the improved performance was attributed to Perovskite-based oxides attract great attention as catalysts for energy and environmental devices. Nanostructure engineering is demonstrated as an effective approach for improving the catalytic activity of the materials. The mechanism for the enhancement, nevertheless, is still not fully understood. In this study, it is demonstrated that compressive strain can be introduced into freestanding perovskite cobaltite La 0.8 Sr 0.2 CoO 3−δ (LSC) nanofibers with sufficient small size. Crystal structure analysis suggests that the LSC fiber is characterized by compressive strain along the ab plane and less distorted CoO 6 octahedron compared to the bulk powder sample. Accompanied by such structural changes, the nanofiber shows significantly higher oxygen reduction reaction (ORR) activity and better stability at elevated temperature, which is attributed to the higher oxygen vacancy concentration and suppressed Sr segregation in the LSC nanofibers. First-principle calculations further suggest that the compressive strain in LSC nanofibers effectively shortens the distance between the Co 3d and O 2p band center and lowers the oxygen vacancy formation energy. The results clarify the critical role of surface stress in determining the intrinsic activity of perovskite oxide nanomaterials. The results of this work can help guide the design of highly active and durable perovskite catalysts via nanostructure engineering.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202104144.

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Section: Electrocatalytic Activity and Stabilitymentioning

confidence: 99%

Enhancing the Intrinsic Activity and Stability of Perovskite Cobaltite at Elevated Temperature Through Surface Stress

Zhou

Liu

et al. 2021

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“…have been proposed for H-SOFCs, 8 but their performance is not satisfactory. The cathode reaction mechanisms revealed that conduction of protons, oxygen-ions and electrons are all important for the cathode performance of H-SOFCs, 9 while only oxygen-ion and electron conductions are involved in oxygen-ion conducting SOFCs, 10 which could explain the unsatisfactory performance of existing O-SOFC cathodes used for H-SOFCs. In other words, the creation of improved proton conduction in the cathode materials is a rational route for designing proper cathodes for H-SOFCs.…”

Section: Introductionmentioning

confidence: 99%

Tailoring cations in a perovskite cathode for proton-conducting solid oxide fuel cells with high performance

et al. 2019

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“…Figure 1 shows a schematic illustrating the oxygen adsorption and dissociation at the Co 3 O 4 (001) surface. It is known that in oxygen reduction mechanisms, the adsorption and dissociation of molecular oxygen are crucial steps [26], and a decrease in the energies of either of these processes will be beneficial for cathode reactions. Here, we decided to perform a comparative study in which three facets, namely, the (001), (110) and (111) crystal planes, are considered.…”

Section: Methodsmentioning

confidence: 99%

Modification of a first-generation solid oxide fuel cell cathode with Co3O4 nanocubes having selectively exposed crystal planes

Wang

Fronzi

et al. 2019

Mater Renew Sustain Energy

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Co 3 O 4 nanocubes with exposed (001) planes were prepared and employed for use as first-generation Sr-doped LaMnO 3 (LSM) cathodes in solid oxide fuel cells to improve the cell performance. Theoretical simulations suggest that the Co 3 O 4 (001) plane has the smallest oxygen adsorption and oxygen dissociation energies compared with other planes, thus favouring cathode reactions in solid oxide fuel cells (SOFCs). Experimental studies consistently demonstrate that a cell using an LSM cathode made with Co 3 O 4 nanocubes with selective (001) surfaces exhibits a peak power density of 500 mW cm −2 at 600 °C, while the power output for a cell using unselective (commercial) Co 3 O 4 nanoparticles is only 179 mW cm −2 at the same temperature. The electrochemical study indicates that the use of Co 3 O 4 nanoparticles with exposed (001) surfaces obviously accelerates the cathode reactions and thus decreases the polarisation resistance, which is the key to improving fuel cell performance. This study demonstrates the feasibility of using the crystal planes of metal oxides to improve the fuel cell performance and provides a new way to design SOFC cathodes.

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Cation deficiency enabled fast oxygen reduction reaction for a novel SOFC cathode with promoted CO2 tolerance

Cited by 116 publications

References 61 publications

Enhancing the Intrinsic Activity and Stability of Perovskite Cobaltite at Elevated Temperature Through Surface Stress

Enhancing the Intrinsic Activity and Stability of Perovskite Cobaltite at Elevated Temperature Through Surface Stress

Tailoring cations in a perovskite cathode for proton-conducting solid oxide fuel cells with high performance

Modification of a first-generation solid oxide fuel cell cathode with Co3O4 nanocubes having selectively exposed crystal planes

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