Three dimensional iron oxide/graphene aerogel hybrids as all-solid-state flexible supercapacitor electrodes

Khattak, Abdul Muqsit; Yin, Huajie; Ghazi, Zahid Ali; Liang, Bin; Iqbal, Azhar; Khan, Niaz Ali; Gao, Yan; Li, Lianshan; Tang, Zhiyong

doi:10.1039/c6ra11106h

Cited by 85 publications

(49 citation statements)

References 53 publications

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“…These are higher than the previous studies reported, [62][63][64][65][66] such as Co 9 S 8 //AC. NC@CoSe 2 //Co-NC@Fe 2 O 3 shows the maximum power density of 8.9 kW/kg at an energy density of 14 Wh/kg.…”

Section: Electrochemical Propertiescontrasting

confidence: 70%

Carbon Nanoarrays Embedded with Metal Compounds for High‐Performance Flexible Supercapacitors

Zhu

Guan

Cai

et al. 2019

Batteries & Supercaps

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Metal-organic frameworks (MOFs)-derived nanoarrays have been widely used as electrode materials in energy storage applications with the unique morphology and large specific surface area. Herein, we report a series of N-doped carbon arrays embedded with different metal compounds (noted as NC@Co 3 O 4 , NC@CoSe 2 and NC@CoS 2 ), which have been derived from a Co-based MOF through simple fabrication processes. The resulted structures have high surface-to-volume ratio and short charge-transfer paths in electrochemical reactions, which greatly benefit the energy storage performance. An asymmetric supercapacitor of NC@CoS 2 //Co-NC@Fe 2 O 3 is also demonstrated, which has a power density up to 23.5 kW/kg and illustrates good cycling stability after long-time rapid charging and discharging. This work demonstrates a promising way to develop MOF-derived nanoarrays for flexible energy storage devices.

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Section: Electrochemical Propertiescontrasting

confidence: 70%

Carbon Nanoarrays Embedded with Metal Compounds for High‐Performance Flexible Supercapacitors

Zhu

Guan

Cai

et al. 2019

Batteries & Supercaps

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“…In the faradaic process, energy storage occurs via electron transfer across the electrolyte‐electrode interface, due to the rapid and reversible reduction/oxidation (redox) processes of the specific materials supported on the electrode surface; such materials are also known as pseudocapacitors . In the non‐faradaic process, however, the energy storage occurs via frequent adsorption/desorption of charged electrolyte ions on the tiny surface of the electrode; no charge transfer occurs . In both of these processes, the electrode material has the main effect on the efficiency of the capacitor.…”

Section: Figurementioning

confidence: 99%

“…Supercapacitors [1] are energy storage devices, also known as electric double-layerc apacitors, that have wide appeal for their massivep owerd ensities, operation over ab road range of temperatures, extra-long life times, and high reversibility.A ccording to the nature of the electrode material and the mechanism of energy storage, supercapacitors can store energy through either faradaic or non-faradaic processes. [2,3] In the faradaic process, energy storage occurs via electron transfer across the electrolyte-electrode interface, due to the rapid and reversible reduction/oxidation( redox) processes of the specific materials supported on the electrode surface;s uch materials are also knowna sp seudocapacitors. [4] In the non-faradaic process, however,t he energy storage occurs via frequenta dsorption/ desorption of charged electrolyte ions on the tiny surface of the electrode;n oc harget ransfer occurs.…”

mentioning

confidence: 99%

A Hollow Microtubular Triazine‐ and Benzobisoxazole‐Based Covalent Organic Framework Presenting Sponge‐Like Shells That Functions as a High‐Performance Supercapacitor

EL‐Mahdy

Hung

Mansoure

et al. 2019

Chemistry An Asian Journal

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In this paper we report the construction of a hollow microtubular triazine‐ and benzobisoxazole‐based covalent organic framework (COF) presenting a sponge‐like shell through a template‐free [3+2] condensation of the planar molecules 2,4,6‐tris(4‐formylphenyl)triazine (TPT‐3CHO) and 2,5‐diaminohydroquinone dihydrochloride (DAHQ‐2HCl). The synthesized COF exhibited extremely high crystallinity, a high surface area (ca. 1855 m2 g−1), and ultrahigh thermal stability. Interestingly, a time‐dependent study of the formation of the hollow microtubular COF having a sponge‐like shell revealed a transformation from initial ribbon‐like crystallites into a hollow tubular structure, and confirmed that the hollow nature of the synthesized COF was controlled by inside‐out Ostwald ripening, while the non‐interaction of the crystallites on the outer surface was responsible for the sponge‐like surface of the tubules. This COF exhibited significant supercapacitor performance: a high specific capacitance of 256 F g−1 at a current density of 0.5 A g−1, excellent cycling stability (98.8 % capacitance retention over 1850 cycles), and a high energy density of 43 Wh kg−1. Such hollow structural COFs with sponge‐like shells appear to have great potential for use as high‐performance supercapacitors in energy storage applications.

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“…With regard to the latter, carbon/metal oxide nanocomposites have been extensively investigated as active materials for charge storage schemes . By integrating metal oxides and carbon the advantages of both materials including high surface area, high conductivity, improved capacitance or energy density and in some cases even higher rate capability and cycling stability can be simultaneously utilized . Pure metal oxide based electrodes typically show low conductivities and stability as well as low surface area .…”

Section: Introductionmentioning

confidence: 99%

“…Iron oxide nanoparticles are incorporated into carbon electrodes by, for example, chemical reduction of graphene oxide in the presence of an Fe(III) salt at elevated temperatures . The resulting Fe 3 O 4 or Fe 2 O 3 nanoparticles are attached to the rGO sheets . In another example, initially grown FeOOH nanorods were electrochemically transformed into Fe 3 O 4 nanoparticles covering the rGO surface .…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanodots as Feedstock for a Uniform Hematite‐Graphene Nanocomposite

Strauß

Anderson

Wang

et al. 2018

Small

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High degrees of dispersion are a prerequisite for functional composite materials for applications in electronics such as sensors, charge and data storage, and catalysis. The use of small precursor materials can be a decisive factor in achieving a high degree of dispersion. In this study, carbon nanodots are used to fabricate a homogeneous, finely dispersed Fe2O3‐graphene composite aerogel in a one‐step conversion process from a precursor mixture. The laser‐assisted conversion of small size carbon nanodots enables a uniform distribution of 6.5 nm Fe2O3 nanoparticles during the formation of a highly conductive carbon matrix. Structural and electrochemical characterization shows that the features of both material entities are maintained and successfully integrated. The presence of Fe2O3 nanoparticles has a positive effect on the active surface area of the carbon aerogel and thus on the capacitance of the material. This is demonstrated by testing the performance of the composite in supercapacitors. Faradaic reactions are exploited in an aqueous electrolyte through the high accessible surface of the incorporated small Fe2O3 nanoparticles boosting the specific capacitance of the 3D turbostratic graphene network significantly.

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Three dimensional iron oxide/graphene aerogel hybrids as all-solid-state flexible supercapacitor electrodes

Abstract: Three dimensional iron oxide/graphene aerogel hybrid (Fe2O3/GA) was synthesized and used as electrode materials in flexible supercapacitor devices, which show high specific capacitance of 440 F g−1 with 89% capacitance retention after 2200 cycles.

Cited by 85 publications

References 53 publications

Carbon Nanoarrays Embedded with Metal Compounds for High‐Performance Flexible Supercapacitors

Carbon Nanoarrays Embedded with Metal Compounds for High‐Performance Flexible Supercapacitors

A Hollow Microtubular Triazine‐ and Benzobisoxazole‐Based Covalent Organic Framework Presenting Sponge‐Like Shells That Functions as a High‐Performance Supercapacitor

Carbon Nanodots as Feedstock for a Uniform Hematite‐Graphene Nanocomposite

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