Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

Silva, Vinícius D.; Simões, Thiago A.; Loureiro, Francisco J.A.; Fagg, Duncan P.; Medeiros, Eliton S.; Macedo, Daniel A.

doi:10.1016/j.matlet.2018.03.088

Cited by 26 publications

(8 citation statements)

References 23 publications

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“…23 A variety of nanofiber morphologies were observed, and the emergence of which strongly depends on the interplay of calcination parameters and ES precursor composition. 24,25 ES of CCO nanofibers is not new, 6,9,20,[26][27][28] but only a few investigated the TE properties of this nanostructured compound. Yin et al 26 combined sol-gel-based ES with spark plasma sintering (SPS) to synthesize nanocrystalline CCO ceramics.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Ca₃Co₄₋_xO₉₊_δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

et al. 2022

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Oxide-based ceramics offer promising thermoelectric (TE) materials for recycling high-temperature waste heat, generated extensively from industrial sources. To further improve the functional performance of TE materials, their power factor should be increased. This can be achieved by nanostructuring and texturing the oxide-based ceramics creating multiple interphases and nanopores, which simultaneously increase the electrical conductivity and the Seebeck coefficient. The aim of this work is to achieve this goal by compacting electrospun nanofibers of calcium cobaltite Ca 3 Co 4−x O 9+δ , known to be a promising p-type TE material with good functional properties and thermal stability up to 1200 K in air. For this purpose, polycrystalline Ca 3 Co 4−x O 9+δ nanofibers and nanoribbons were fabricated by sol-gel electrospinning and calcination at intermediate temperatures to obtain small primary particle sizes. Bulk ceramics were formed by sintering pressed compacts of calcined nanofibers during TE measurements. The bulk nanofiber sample pre-calcined at 973 K exhibited an improved Seebeck coefficient of 176.5 S cm −1 and a power factor of 2.47 μW cm −1 K −2 similar to an electrospun nanofiber-derived ceramic compacted by spark plasma sintering.

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Section: Introductionmentioning

confidence: 99%

Electrospun Ca₃Co₄₋_xO₉₊_δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

et al. 2022

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“…Different metal oxide hollow nanofibers were successfully synthesized by Daniel's group with this method using PVP as the sacrificing template, and exhibited promising OER performance. [91][92][93] Different from complete decomposition of PVP at high temperature thermal treatment, PVP can be partially remained during a lower temperature synthesis to become carbon substrate. [94] Li et al applied a two-step annealing process (air stabilization at 250 ℃ , then N 2 heating at 600 ℃ ) to the Co and Fe containing PVP nanofibers, and the resulted composite material exhibited excellent OER performance with a potential at 10 mA/cm 2 only 7 mV negative than commercial RuO 2 catalyst.…”

Section: Pvpmentioning

confidence: 99%

Fibrous‐Structured Freestanding Electrodes for Oxygen Electrocatalysis

Jiang

Fang

et al. 2019

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Electrocatalysts used for oxygen reduction and oxygen evolution reactions are critical materials in many renewable‐energy devices, such as rechargeable metal–air batteries, regenerative fuel cells, and water‐splitting systems. Compared with conventional electrodes made from catalyst powders, oxygen electrodes with a freestanding architecture are highly desirable because of their binder‐free fabrication and effective elimination of catalyst agglomeration. Among all freestanding electrode structures that have been investigated so far, fibrous materials exhibit many unique advantages, such as a wide range of available fibers, low material and material‐processing costs, large specific surface area, highly porous structure, and simplicity of fiber functionalization. Recent advances in the use of fibrous structures for freestanding electrocatalytic oxygen electrodes are summarized, including electrospun nanofibers, bacterial cellulose, cellulose fibrous structures, carbon clothes/papers, metal nanowires, and metal meshes. After detailed discussion of common techniques for oxygen electrode evaluation, freestanding electrode fabrication, and their electrocatalytic performance, current challenges and future prospects are also presented for future development.

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“…20 It delivers a stable reversible capacity of ∼500 mA h g –1 after 50 cycles. Recently, some other synthetic methods have also been reported for the preparation of performance-optimized Ca 3 Co 4 O 9 compounds, for instance, Ca 3 Co 4 O 9 nanofibers obtained by solution blow spinning, 21 polycrystalline Ca 3 Co 4 O 9 materials synthesized by sintering and spark plasma sintering, 22 and Cr-doped Ca 3 Co 4 O 9 materials synthesized by the thermal hydrodecomposition method. 23 However, as for another layered Co–Ca-based ternary oxides of Ca 9 Co 12 O 28 , the currently reported synthetic methods can hardly meet the demands for the sake of improving their structural stability and rate capability.…”

Section: Introductionmentioning

confidence: 99%

Bricklike Ca₉Co₁₂O₂₈ as an Active/Inactive Composite for Lithium-Ion Batteries with Enhanced Rate Performances

et al. 2019

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Transition-metal oxides are considered as promising anode materials because of the high theoretical specific capacities. However, the fast capacity fading and unstable cycling performance restricted their electrochemical performance. To achieve fast and stable lithium storage capability, in this work, bricklike Ca 9 Co 12 O 28 is synthesized via a modified Pechini method with the assistance of the C 12 H 25 SO 4 Na surfactant. The as-obtained Ca 9 Co 12 O 28 ternary oxides exhibit stable structural stability, which may be attributed to the in situ formed CaO layers during the first discharge process. When tested as an anode material in lithium-ion batteries (LIBs), bricklike Ca 9 Co 12 O 28 exhibits an excellent reversible capacity of 517 mA h g –1 at 1 C after 200 cycles. Even at the high rate of 3 C, the discharge capacity can still reach 392 mA h g –1 after 200 cycles. It reveals a great application prospect in anode materials of LIBs.

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Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

Cited by 26 publications

References 23 publications

Electrospun Ca₃Co₄₋_xO₉₊_δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Electrospun Ca₃Co₄₋_xO₉₊_δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Fibrous‐Structured Freestanding Electrodes for Oxygen Electrocatalysis

Bricklike Ca₉Co₁₂O₂₈ as an Active/Inactive Composite for Lithium-Ion Batteries with Enhanced Rate Performances

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Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

Cited by 26 publications

References 23 publications

Electrospun Ca3Co4−xO9+δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Electrospun Ca3Co4−xO9+δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Fibrous‐Structured Freestanding Electrodes for Oxygen Electrocatalysis

Bricklike Ca9Co12O28 as an Active/Inactive Composite for Lithium-Ion Batteries with Enhanced Rate Performances

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Electrospun Ca₃Co₄₋_xO₉₊_δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Electrospun Ca₃Co₄₋_xO₉₊_δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Bricklike Ca₉Co₁₂O₂₈ as an Active/Inactive Composite for Lithium-Ion Batteries with Enhanced Rate Performances