Facile synthesis of Co<sub>3</sub>O<sub>4</sub>porous nanosheets/reduced graphene oxide composites and their excellent supercapacitor performance

Ma, Lianbo; Zhou, Hu; Shen, Xiaoping; Chen, Quanrun; Zhu, Guoxing; Ji, Zhenyuan

doi:10.1039/c4ra07136k

Cited by 67 publications

(39 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was also found that the binding energies of Mn 2p from CoB@MnO2 shifted positively compared to those from the bulk MnOx [39][40][41] . This is due to the fact that when MnOx is highly dispersed on the support, a strong electrostatic field is produced, leading to the positive shift of the Mn 2p binding energy peak 42,43 34,44,45 . In the case of CoB@MnO2, two features were observed.…”

Section: Resultsmentioning

confidence: 99%

Achieving highly practical capacitance of MnO₂ by using chain-like CoB alloy as support

Yan

Wang

et al. 2018

Nanoscale

View full text Add to dashboard Cite

The practical performance of MnO2 as a capacitor material is limited mainly by its poor electronic conductivity. Arranging MnO2 on the conductive backbone to form a unique hierarchical nanostructure is an efficient way to enhance its capacitor performance. Herein, a hierarchically core-shell structure, in which thin γ-MnO2 sheets are grown on amorphous CoB alloy nano-chains (CoB@MnO2), is produced via a simple and scalable solution-phase procedure at room temperature. A specific capacitance of 612.0 F g-1 is obtained for the CoB@MnO2 capacitor electrode at a discharge current density of 0.5 A g-1, a value higher than those obtained for other conductive materials supported MnO2 electrodes reported in the literature. A rate retention value of 60.9% of its initial capacitance is obtained when the discharge current density increased by 12-fold. It is found that after 6000 charge-discharge cycles at 2 A g-1, the specific performance of CoB@MnO2 is 86.5%. The excellent capacitor performance of CoB@MnO2 is explained to be due to the hierarchical core-shell structure, in which the CoB alloy nano-chain backbone provides a transport pathway for the electron, and the porous MnO2 outer layers provide the channel for mass transfer, hence allowing further exposure to active sites. The combination of high capacitor performance and low-cost synthesis makes the core-shell CoB@MnO2 a promising cathode material for alkaline electrolyte supercapacitors.

show abstract

Section: Resultsmentioning

confidence: 99%

Achieving highly practical capacitance of MnO₂ by using chain-like CoB alloy as support

Yan

Wang

et al. 2018

Nanoscale

View full text Add to dashboard Cite

show abstract

“…Carbon‐based materials including carbon particles, carbon nanotubes, carbon nanofibers, graphite, and graphene have been used as electrodes for EDLCs owing to their exceptional properties, such as high surface area, porous structure, chemical inertness, and good electrical conductivity that promote a nanoscopic charge separation at the electrode/electrolyte interface . In addition to carbon, both conducting polymers and transition metal oxides such as manganese oxides (MnO, Mn 2 O 3 , Mn 3 O 4 , MnO 2 ), RuO 2 , Fe 3 O 4 , SnO 2 , NiO, Fe 2 O 3 , TiO 2 , MoO 2 , MoO 3 , CuO, Co 3 O 4 , NiCo 2 O 4 , ZnO, Bi 2 O 3, Nb 2 O 5 , etc., have been used as electrode materials in pseudocapacitors due to their electrochemically active nature and the ability to carry out the Faradaic redox reaction . The electron transfer between the electrodes and the electrolytes comes from the reversible electrochemical doping–redoping with conductive polymers and fast Faradaic redox reactions in transition metal oxides, respectively.…”

Section: Supercapacitorsmentioning

confidence: 99%

Graphene‐Based Nanocomposites for Energy Storage

Meduri

Agubra

et al. 2016

Advanced Energy Materials

338

176

View full text Add to dashboard Cite

Since the first report of using micromechanical cleavage method to produce graphene sheets in 2004, graphene/graphene‐based nanocomposites have attracted wide attention both for fundamental aspects as well as applications in advanced energy storage and conversion systems. In comparison to other materials, graphene‐based nanostructured materials have unique 2D structure, high electronic mobility, exceptional electronic and thermal conductivities, excellent optical transmittance, good mechanical strength, and ultrahigh surface area. Therefore, they are considered as attractive materials for hydrogen (H2) storage and high‐performance electrochemical energy storage devices, such as supercapacitors, rechargeable lithium (Li)‐ion batteries, Li–sulfur batteries, Li–air batteries, sodium (Na)‐ion batteries, Na–air batteries, zinc (Zn)–air batteries, and vanadium redox flow batteries (VRFB), etc., as they can improve the efficiency, capacity, gravimetric energy/power densities, and cycle life of these energy storage devices. In this article, recent progress reported on the synthesis and fabrication of graphene nanocomposite materials for applications in these aforementioned various energy storage systems is reviewed. Importantly, the prospects and future challenges in both scalable manufacturing and more energy storage‐related applications are discussed.

show abstract

“…For as-prepared Co 3 O 4 specimen, four characteristic peaks were observed at 190, 488, 585 and 682 cm À1 , which correspond to the F 1 2g , E g , F 2 2g and A 1g Raman-active modes of the Co 3 O 4 cubic phase, respectively. 25 For the asprepared rGO and RCo5 composite, two broad peaks corresponding to the D band at 1352 cm À1 and G band at 1597 cm À1 were observed, respectively, which showed the existence of rGO. 26 Besides, the peaks of Co 3 O 4 were also observed.…”

Section: Morphology and Structurementioning

confidence: 96%

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature

Bai

Sun

et al. 2016

RSC Adv.

View full text Add to dashboard Cite

Although the gas sensing properties of p-type semiconductors (such as Co 3 O 4 ) generally are lower than those of n-type oxide semiconductors, high quality gas sensors can still be designed by various modified methods due to their distinctive surface reactivity. In the work, the rGO/Co 3 O 4 composites with different formulations have been successfully synthesized by a facile hydrothermal reaction. The morphology, structure and composition of as-prepared composites were characterized by XRD, FESEM, Raman, TG, XPS spectrum and BET analysis, respectively. The sensing tests indicate that the 5 wt% rGO composite to toluene not only exhibits the highest response and excellent selectivity, but also has linear response in concentration lower 5 ppm, indicating the composite is a promising sensing material for detection of toluene. Furthermore, the mechanism of rGO enhanced composite gas sensing is also discussed in detail, which is attributed to rGO action in composite and the formation of p-p isotype heterojunction at the interface between rGO and Co 3 O 4 .

show abstract

Facile synthesis of Co₃O₄porous nanosheets/reduced graphene oxide composites and their excellent supercapacitor performance

Abstract: Porous Co3O4 nanosheets/RGO composite with excellent capacitive performance was prepared through a facile two-step strategy.

Cited by 67 publications

References 70 publications

Achieving highly practical capacitance of MnO₂ by using chain-like CoB alloy as support

Achieving highly practical capacitance of MnO₂ by using chain-like CoB alloy as support

Graphene‐Based Nanocomposites for Energy Storage

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature

Contact Info

Product

Resources

About

Facile synthesis of Co3O4porous nanosheets/reduced graphene oxide composites and their excellent supercapacitor performance

Abstract: Porous Co3O4 nanosheets/RGO composite with excellent capacitive performance was prepared through a facile two-step strategy.

Cited by 67 publications

References 70 publications

Achieving highly practical capacitance of MnO2 by using chain-like CoB alloy as support

Achieving highly practical capacitance of MnO2 by using chain-like CoB alloy as support

Graphene‐Based Nanocomposites for Energy Storage

Preparation of reduced graphene oxide/Co3O4 composites and sensing performance to toluene at low temperature

Contact Info

Product

Resources

About

Facile synthesis of Co₃O₄porous nanosheets/reduced graphene oxide composites and their excellent supercapacitor performance

Achieving highly practical capacitance of MnO₂ by using chain-like CoB alloy as support

Achieving highly practical capacitance of MnO₂ by using chain-like CoB alloy as support

Preparation of reduced graphene oxide/Co₃O₄ composites and sensing performance to toluene at low temperature