Supercritical CO2-Mediated Synthesis of CNT@Co3O4 Nanocomposite and Its Application for Energy Storage

Nguyen, Van Hoa; Jung, Seungho; Roh, Changhyun; Shim, Jae‐Jin

doi:10.1021/acs.iecr.5b04069

Cited by 24 publications

(13 citation statements)

References 33 publications

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“…In addition, SCCO 2 fluid can act as a precursor carrier for the fabrication of various nanomaterials. For example, nano‐size Ni, [ 27 ] Fe, [ 28 ] Pd, [ 22 ] Pt, [ 29 ] Au, [ 30 ] MnO 2 , [ 31 ] SnO 2 , [ 32 ] V 2 O 5 , [ 33 ] Fe 3 O 4 , [ 34 ] Co 3 O 4 [ 35 ] have been synthesized and anchored on various nanostructured carbon materials. In addition, our team has demonstrated that SCCO 2 itself can serve as the precursor in the synthesis of a highly porous CoCO 3 /graphene nanocomposite anode for Li + and Na + storage.…”

Section: Introductionmentioning

confidence: 99%

Supercritical CO₂‐Assisted SiO_x/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

Hernandha

Rath

Umesh

et al. 2021

Adv Funct Materials

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Supercritical CO2 (SCCO2), characterized by gas‐like diffusivity, low surface tension, and excellent mass transfer properties, is applied to create a SiOx/carbon multi‐layer coating on Si particles. Interaction of SCCO2 with Si produces a continuous SiOx layer, which can buffer Si volume change during lithiation/delithiation. In addition, a conformal carbon film is deposited around the Si@SiOx core. Compared to the carbon film produced via a conventional wet‐chemical method, the SCCO2‐deposited carbon has significantly fewer oxygen‐containing functional groups and thus higher electronic conductivity. Three types of carbon precursors, namely, glucose, sucrose, and citric acid, in the SCCO2 syntheses are compared. An eco‐friendly, cost‐effective, and scalable SCCO2 process is thus developed for the single‐step production of a unique Si@SiOx@C anode for Li‐ion batteries. The sample prepared using the glucose precursor shows the highest tap density, the lowest charge transfer resistance, and the best Li+ transport kinetics among the electrodes, resulting in a high specific capacity of 918 mAh g−1 at 5 A g−1. After 300 charge–discharge cycles, the electrode retains its integrity and the accumulation of the solid electrolyte interphase is low. The great potential of the proposed SCCO2 synthesis and composite anode for Li‐ion battery applications is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Supercritical CO₂‐Assisted SiO_x/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

Hernandha

Rath

Umesh

et al. 2021

Adv Funct Materials

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“…Hence, active oxide particles are very often deposited on various supports with appropriate thermal and mechanical stability as well as a developed surface. The supports most frequently used for the deposition of Co 3 O 4 are based on different individual metal oxides (e.g., Al 2 O 3 [21][22][23], SiO 2 [24], TiO 2 [25][26][27], CeO 2 [28,29], ZrO 2 [30], Fe 2 O 3 [31]), nitrogen-doped carbons [32][33][34], zeolites [35,36], perovskites [37] or hydrotalcites [38,39].…”

Section: Introductionmentioning

confidence: 99%

In Search of Factors Determining Activity of Co3O4 Nanoparticles Dispersed in Partially Exfoliated Montmorillonite Structure

Rokicińska¹,

Berniak²,

Drozdek³

et al. 2021

Molecules

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The paper discusses a formation of Mt–PAA composite containing a natural montmorillonite structure partially exfoliated by poly(acrylic acid) introduced through intercalation polymerization of acrylic acid. Mt–PAA was subsequently modified by controlled adsorption of Co2+ ions. The presence of aluminosilicate packets (clay) and carboxyl groups (hydrogel) led to the deposition of significant amounts of Co2+ ions, which after calcination formed the Co3O4 spinel particles. The conditions of the Co2+ ions’ deposition (pH, volume and concentration of Co(NO3)2 solution, as well as a type of pH-controlling agent) were widely varied. Physicochemical characterization of the prepared materials (including X-ray fluorescence (XRF), X-ray powder diffraction (XRD), low-temperature nitrogen adsorption, X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (H2-TPR)) revealed that the modification conditions strongly influenced the content as well as the distribution of the Co3O4 active phase, tuning its reducibility. The latter parameter was, in turn, very important from the point of view of catalytic activity in the combustion of aromatic volatile organic compounds (VOCs) following the Mars–van Krevelen mechanism.

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“…synthesized NixCo 3 ‐xO 4 /CNTs nanocomposite obtain high electrochemical performance according to the synergistic effects of Ni−Co mixed oxides and CNTs, showing a high energy density of 23.56 Wh⋅kg −1 at power density of 800.15 W⋅kg −1 . Carbon nanotubes (CNT)/cobalt oxide (Co 3 O 4 ) nanocomposites were synthesized by Nguyen et al . CNTs have been considered excellent fillers for metal oxides on improving the electric conductivity and exhibited a high specific capacitance of 950 F⋅g −1 at a current density of 1 A⋅g −1 .…”

Section: Introductionmentioning

confidence: 99%

Facile Construction of Sandwich‐like Co₃O₄/CNTs Complex for High‐performance Asymmetric Supercapacitors

et al. 2019

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Sandwich-like, hetero-structured Co 3 O 4 /CNTs were prepared by a simple hydrothermal and self-assembly process. The CNTs insert into layered Co 3 O 4 sheets and ensure fast electron transfer between the Co 3 O 4 sheets for a faradaic reaction close to the electroactive sites and effectively inhibit the deformation and collapse of the pseudocapacitance material in the cyclic process. The well-ordered complex delivers a specific capaci-tance of 562.22 F⋅g À 1 at a current density of 1 A⋅g À 1 ; and in a three-electrode system with regard to hold 96% of the primitive specific capacitance after 5000 cycles. An asymmetric supercapacitor was assembled with Co 3 O 4 /CNTs as positive electrode and activated carbon (AC) as negative electrode, the device shows a high energy density of 157.5 W⋅h⋅kg À 1 at a power density of 2520 W⋅kg À 1 .

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Supercritical CO₂-Mediated Synthesis of CNT@Co₃O₄ Nanocomposite and Its Application for Energy Storage

Cited by 24 publications

References 33 publications

Supercritical CO₂‐Assisted SiO_x/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

Supercritical CO₂‐Assisted SiO_x/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

In Search of Factors Determining Activity of Co3O4 Nanoparticles Dispersed in Partially Exfoliated Montmorillonite Structure

Facile Construction of Sandwich‐like Co₃O₄/CNTs Complex for High‐performance Asymmetric Supercapacitors

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Supercritical CO2-Mediated Synthesis of CNT@Co3O4 Nanocomposite and Its Application for Energy Storage

Cited by 24 publications

References 33 publications

Supercritical CO2‐Assisted SiOx/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

Supercritical CO2‐Assisted SiOx/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

In Search of Factors Determining Activity of Co3O4 Nanoparticles Dispersed in Partially Exfoliated Montmorillonite Structure

Facile Construction of Sandwich‐like Co3O4/CNTs Complex for High‐performance Asymmetric Supercapacitors

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Product

Resources

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Supercritical CO₂-Mediated Synthesis of CNT@Co₃O₄ Nanocomposite and Its Application for Energy Storage

Supercritical CO₂‐Assisted SiO_x/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

Supercritical CO₂‐Assisted SiO_x/Carbon Multi‐Layer Coating on Si Anode for Lithium‐Ion Batteries

Facile Construction of Sandwich‐like Co₃O₄/CNTs Complex for High‐performance Asymmetric Supercapacitors