A carbon modified MnO2 nanosheet array as a stable high-capacitance supercapacitor electrode

Huang, Yu; Li, Yuanyuan; Hu, Zhenzhong; Wei, Guangming; Guo, Junling; Liu, Jinping

doi:10.1039/c3ta12148h

Cited by 141 publications

(95 citation statements)

References 38 publications

(17 reference statements)

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“…The weak peaks in the range of 501-640 cm −1 come from MnO 2 nanosheets, in agreement with the previous report about α-MnO 2 . [33] After the GQDs were in situ formed on the surface of MnO 2 nanosheets, the Raman spectrum also contained characteristic D and G peaks of carbon materials at ≈1350 and 1580 cm −1 , which implies the existence of carbon materials. Combined with the TEM results, this demonstrates that the carbon materials are GQDs.…”

Section: Resultsmentioning

confidence: 97%

“…44-0141). [33] And there is one additional small peak located at 43.1° in addition to MnO 2 , which means the existence of impurities. Based on previously reported results, the XRD diffraction peak at 43.3° can be indexed to (200) of NiO, [34,35] which probably comes from the gradual oxidation of Ni foam in hydrothermal and cannot be avoided when scratching active materials from the Ni foam for XRD measurement.…”

Section: Resultsmentioning

confidence: 99%

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Heterostructural Graphene Quantum Dot/MnO₂ Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

et al. 2018

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a great deal of research effort has been devoted on high energy density supercapacitors. According to the equation of energy density E = 1/2 CV 2 , the energy density (E) of supercapacitors can be enhanced by increasing either voltage window (V) or specific capacitance (C). [5] For high specific capacitance, one of the research efforts should concentrate on using transition metal oxides (TMO) (e.g., MnO 2 , RuO 2 ) as electrode materials. [6,7] They can provide great specific capacitance due to the pseudocapacitive characteristic. [8,9] Among TMO materials, MnO 2 is one of the most potential materials for supercapacitors due to its high theoretical specific capacitance, environmental friendliness, and the high practical voltage window (about 1 V). [2] However, it has suffered from intrinsically low conductivity and specific surface area, which severely restrict its further development in practical application of supercapacitors. In this regard, integrating nanostructured MnO 2 and conductive carbon materials to fabricate novel hybrid nanostructures is a plausible solution to overcome this obstacle. [4] Further, some research efforts have been accordingly performed to synthesize hybrid nanostructures electroactive materials for constructing supercapacitors with considerable performance. Some researchers accordingly synthesized highperformance nanostructured MnO 2 -carbon materials electrodes, whose specific capacitance is close to theoretical value. However, the undesirable contact resistances that produced by the weak and noncoherent TMO/conductor interfaces lead to sluggish kinetics for charge transport, which requires further improvement. [10,11] In order to further improve the energy density, some researchers have concentrated on enlarging the voltage window of supercapacitors. The applications of aqueous electrolytes have been limited by their theoretical voltage window (≈1.23 V) and the practical voltage window is mostly lower than about 1 V for supercapacitors. [12] To extend the voltage window, various techniques have been applied, such as dual shuttle-ion electrolytes, [13,14] pH adjustment of electrolytes, [15] and concentrated electrolytes. [16][17][18] All of these methods have complex processing technologies and sacrifice capacitance, so being difficult for practical applications. Recently, Zhu and co-workers

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Heterostructural Graphene Quantum Dot/MnO₂ Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

et al. 2018

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“…The Mn 2p 1/2 peak is centered at 653.7 eV whereas the Mn 2p 3/2 peak can be fi tted by three peaks including Mn 2+ (640.7 eV), Mn 3+ (641.8 eV), and Mn 4+ (643.15 eV), respectively. [ 43 ] However, the area of the Mn 2+ peak decreases signifi cantly together with the appearance of a sharp Mn 3+ peak and slight shift in Mn 4+ (643.0 eV) with increasing annealing temperature. This is probably due to the formation of Mn 3+ from the reaction between Mn 2+ and Mn 4+ .…”

Section: Resultsmentioning

confidence: 98%

Robust Electrodes Based on Coaxial TiC/C-MnO₂Core/Shell Nanofiber Arrays with Excellent Cycling Stability for High-Performance Supercapacitors

Zhang

Peng

et al. 2014

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A coaxial electrode structure composed of manganese oxide-decorated TiC/C core/shell nanofiber arrays is produced hydrothermally in a KMnO4 solution. The pristine TiC/C core/shell structure prepared on the Ti alloy substrate provides the self-sacrificing carbon shell and highly conductive TiC core, thus greatly simplifying the fabrication process without requiring an additional reduction source and conductive additive. The as-prepared electrode exhibits a high specific capacitance of 645 F g(-1) at a discharging current density of 1 A g(-1) attributable to the highly conductive TiC/C and amorphous MnO2 shell with fast ion diffusion. In the charging/discharging cycling test, the as-prepared electrode shows high stability and 99% capacity retention after 5000 cycles. Although the thermal treatment conducted on the as-prepared electrode decreases the initial capacitance, the electrode undergoes capacitance recovery through structural transformation from the crystalline cluster to layered birnessite type MnO2 nanosheets as a result of dissolution and further electrodeposition in the cycling. 96.5% of the initial capacitance is retained after 1000 cycles at high charging/discharging current density of 25 A g(-1). This study demonstrates a novel scaffold to construct MnO2 based SCs with high specific capacitance as well as excellent mechanical and cycling stability boding well for future design of high-performance MnO2-based SCs.

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“…It has been reported that different kinds of oxide-based materials were explored as electrodes for pseudocapacitor. Especially NiO (674.2 F g -1 ), Co 3 O 4 (905 F g -1 ), MnO 2 (622 F g -1 ), NiWO 4 (173 F g -1 ), etc., [2][3][4][5] have been used as the positive electrodes. On the other hand, Bi 2 O 3 (386 F g -1 ), Fe 3 O 4 (163 F g -1 ), VN (413 F g -1 ), BiPO 4 (302 F g -1 ), etc., [6][7][8][9] have been used as the negative electrode materials: however, the obtained specific capacitance of negative electrodes is still insufficient to meet the practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

et al. 2015

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Polyvinylpyrrolidone (PVP)-assisted Bi 2 WO 6 nanoparticles were successfully synthesized by sonochemical method. Three different concentrations of PVP (0.05, 0.1, and 0.2 g) were used, and their effects over the structural, morphological, compositional, and electrochemical analysis were studied. The structural investigation revealed the formation of 100 % pure Bi 2 WO 6 phase. The presence of carbon in the PVP-assisted materials was evidenced from differential scanning calorimetry, Fourier transform infra red (FT-IR) spectroscopy and Raman analysis. There was a reduction in the particle size of Bi 2 WO 6 (30-35 nm) upon using PVP. The highly crystalline nature and the presence of carbon coating over Bi 2 WO 6 were evidenced from the high-resolution transmission electron microscopic image. Besides, the calculated d-spacing of 0.19 nm attributed to (2 0 6) lattice plane of Bi 2 WO 6 nanoparticles. Subsequently, a shift in binding energy toward larger values while using PVP was identified through X-ray photoelectron spectroscopic analysis. The electrochemical analysis showed a subsequent enhancement in specific capacitance of PVP-assisted Bi 2 WO 6 (462 F g -1 ) compared with pristine Bi 2 WO 6 (304 F g -1 ) at 3 mA cm -2 .

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A carbon modified MnO2 nanosheet array as a stable high-capacitance supercapacitor electrode

Cited by 141 publications

References 38 publications

Heterostructural Graphene Quantum Dot/MnO₂ Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

Heterostructural Graphene Quantum Dot/MnO₂ Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

Robust Electrodes Based on Coaxial TiC/C-MnO₂Core/Shell Nanofiber Arrays with Excellent Cycling Stability for High-Performance Supercapacitors

Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

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A carbon modified MnO2 nanosheet array as a stable high-capacitance supercapacitor electrode

Cited by 141 publications

References 38 publications

Heterostructural Graphene Quantum Dot/MnO2 Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

Heterostructural Graphene Quantum Dot/MnO2 Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

Robust Electrodes Based on Coaxial TiC/C-MnO2Core/Shell Nanofiber Arrays with Excellent Cycling Stability for High-Performance Supercapacitors

Effect of carbon coating on the electrochemical properties of Bi2WO6 nanoparticles by PVP-assisted sonochemical method

Contact Info

Product

Resources

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Heterostructural Graphene Quantum Dot/MnO₂ Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

Heterostructural Graphene Quantum Dot/MnO₂ Nanosheets toward High‐Potential Window Electrodes for High‐Performance Supercapacitors

Robust Electrodes Based on Coaxial TiC/C-MnO₂Core/Shell Nanofiber Arrays with Excellent Cycling Stability for High-Performance Supercapacitors