Template synthesis of hierarchical mesoporous δ-MnO 2 hollow microspheres as electrode material for high-performance symmetric supercapacitor

Xiao, Wei; Zhou, Wenjie; Yu, Hong; Pu, Yong; Zhang, Yanhua; Hu, Chengbo

doi:10.1016/j.electacta.2018.01.070

Cited by 57 publications

(23 citation statements)

References 56 publications

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“…127 For sphere-like hollow structures and specic template-like structures, the main preponderance is that the morphologies of these structures are easy to be controlled and can be scaled up as templates are oen applied in these strategies. [128][129][130][131] These structures oen possess high specic capacitance and good rate capability as the hollow structure can be used as a transit depot for the electrolyte, which shortens the ion transfer distance. Zhang et al reported a yolk and hollow structure assembled with ultrathin birnessite lms which gives a high specic capacitance of 273 F g À1 with good rate capability.…”

Section: Crystal Dimensional Regulationmentioning

confidence: 99%

Birnessite based nanostructures for supercapacitors: challenges, strategies and prospects

et al. 2020

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Section: Crystal Dimensional Regulationmentioning

confidence: 99%

Birnessite based nanostructures for supercapacitors: challenges, strategies and prospects

et al. 2020

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“…Among diverse energy storage systems, electrochemical capacitor, so-called supercapacitor, is recognized as one of the most promising next-generation candidates because of its ultrahigh power density, short charge/discharge time, long cycle life, stable performance, and broad working temperature, which has found many applications in consumer electronics, backup power supply, hybrid electrical vehicle, and implantable medical devices [3,4,5]. Based on the charge storage mechanism, supercapacitors can be classified as electrical double-layer capacitors (EDLCs) and pseudocapacitors [6,7]. The former relies on the electrostatic accumulation of electrolyte ions at the electrode/electrolyte interface to store energy, while the later achieves this point by the reversible Faradaic redox reactions occurring near the electrode surface [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the charge storage mechanism, supercapacitors can be classified as electrical double-layer capacitors (EDLCs) and pseudocapacitors [6,7]. The former relies on the electrostatic accumulation of electrolyte ions at the electrode/electrolyte interface to store energy, while the later achieves this point by the reversible Faradaic redox reactions occurring near the electrode surface [6,7]. Overall, compared with pseudocapacitors, EDLCs offer higher power density but lower energy density, meanwhile, they are more environmentally friendly and much safer [7].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Porous Carbon Derived from Sichuan Pepper for High-Performance Symmetric Supercapacitor with Decent Rate Capability and Cycling Stability

et al. 2019

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Hierarchical micro-mesoporous carbon (denoted as HPC-2 in this study) was synthesized by pre-carbonization of biomass Sichuan pepper followed by KOH activation. It possessed well-developed porosity with the specific surface area of 1823.1 m2 g−1 and pore volume of 0.906 cm3 g−1, and exhibited impressive supercapacitive behaviors. For example, the largest specific capacitance of HPC-2 was tested to be ca. 171 F g−1 in a three-electrode setup with outstanding rate capability and stable electrochemical property, whose capacitance retention was near 100% after cycling at rather a high current density of 40 A g−1 for up to 10,000 cycles. Furthermore, a two-electrode symmetric supercapacitor cell of HPC-2//HPC-2 was constructed, which delivered the maximum specific capacitance and energy density of ca. 30 F g−1 and 4.2 Wh kg−1, respectively, had prominent rate performance and cycling stability with negligible capacitance decay after repetitive charge/discharge at a high current density of 10 A g−1 for over 10,000 cycles. Such electrochemical properties of HPC-2 in both three- and two-electrode systems are superior or comparable to those of a great number of porous biomass carbon reported previously, hence making it a promising candidate for the development of high-performance energy storage devices.

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“…The charge/discharge time decreases along with a small number of electrolyte ions occupying the active sites. By contrast, at lower current densities, more internal and external active sites are involved, attaining more complete redox reactions and higher specific capacitances [ 79 ]. The increased charge/discharge time results from most electrolyte ions being anchored to the active sites at the interface.…”

Section: Resultsmentioning

confidence: 99%

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

Chiu

Cho

2018

Nanomaterials

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MnO2/N-containing graphene composites with various contents of Mn were fabricated and used as active materials for the electrodes of flexible solid-state asymmetric supercapacitors. By scanning electron microscopes (SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectrometer (XPS), fourier-transform infrared spectroscopy (FTIR) and Raman spectra, the presence of MnO2 and N-containing graphene was verified. The MnO2 nanostructures decorated on the N-containing graphene were of α- and γ-mixed phases. N-containing graphene was found to reduce the charge transfer impedance in the high-frequency region at the electrode/electrolyte interface (RCT) due to its good conductivity. The co-existence of MnO2 and N-containing graphene led to a more reduced RCT and improved charge transfer. Both the mass loading and content of Mn in an active material electrode were crucial. Excess Mn caused reduced contacts between the electrode and electrolyte ions, leading to increased RCT, and suppressed ionic diffusion. When the optimized mass loading and Mn content were used, the 3-NGM1 electrode exhibiting the smallest RCT and a lower ionic diffusion impedance was obtained. It also showed a high specific capacitance of 638 F·g−1 by calculation from the cyclic voltammetry (CV) curves. The corresponding energy and power densities were 372.7 Wh·kg−1 and 4731.1 W·kg−1, respectively. The superior capacitance property arising from the synergistic effect of mixed-phase MnO2 and N-containing graphene had permitted the composites promising active materials for flexible solid-state asymmetric supercapacitors. Moreover, the increase of specific capacitance was found to be more significant by the pseudocapacitive MnO2 than N-containing graphene.

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Template synthesis of hierarchical mesoporous δ-MnO 2 hollow microspheres as electrode material for high-performance symmetric supercapacitor

Cited by 57 publications

References 56 publications

Birnessite based nanostructures for supercapacitors: challenges, strategies and prospects

Birnessite based nanostructures for supercapacitors: challenges, strategies and prospects

Hierarchical Porous Carbon Derived from Sichuan Pepper for High-Performance Symmetric Supercapacitor with Decent Rate Capability and Cycling Stability

Mixed-Phase MnO2/N-Containing Graphene Composites Applied as Electrode Active Materials for Flexible Asymmetric Solid-State Supercapacitors

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