High-performance all-solid-state asymmetric stretchable supercapacitors based on wrinkled MnO2/CNT and Fe2O3/CNT macrofilms

Gu, Taoli; Wei, Bingqing

doi:10.1039/c6ta04712b

Cited by 124 publications

(68 citation statements)

References 42 publications

(72 reference statements)

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“…7c, α 44 and also some carbon/graphene based SSCs, 45,46 and are comparable to that reported for VO x //VN-ASCs, i.e., 0.61 mWh/cm 3 , 0.5 mA/cm 2 . 39 The highest volumetric-power-density values for the present ASCs are almost similar, i.e., ∼155 mW/cm 3 at the load current of 7 mA, whereas the gravimetric power density is found to be higher for α- densities of the assembled ASCs are also compared with those reported in the literature 9,10,12,41,[47][48][49][50][51] and are shown in the Fig. 7c, which also suggest superior performance for the supercapacitors reported in this study.…”

Section: Resultssupporting

confidence: 62%

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

Sarkar

Pal

Mandal

et al. 2017

J. Electrochem. Soc.

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A α-Fe 2 O 3 /MnO x core-shell nanorod (NR)-based positive electrode is designed combining the traits of α-Fe 2 O 3 and MnO x with an ultrathin MnO x shell serving as active site for surface or near-surface based fast and reversible faradaic-reactions and α-Fe 2 O 3 NR core facilitating electron transfer toward the current collector. The α-Fe 2 O 3 /MnO x core-shell NR electrode shows ameliorated electrochemical performance in terms of capacitance and rate capability within the potential window of 0-1 V in relation to both pristine α-Fe 2 O 3 NR electrode and pristine MnO x thin film electrode. Similarly, α-Fe 2 O 3 /C core-shell NR negative electrode is also realized. The assembled α-Fe 2 O 3 /C//α-Fe 2 O 3 /MnO x core-shell NR asymmetric supercapacitor (ASC) exhibits a volumetric capacitance of ∼ 1.28 F/cm 3 at a scan rate of 10 mV/s with nearly 78% capacitance retention at the scan rate of 400 mV/s within a potential window of 0-2 V in aqueous electrolyte medium. Interestingly, the ASC delivers a maximum energy-density of ∼ 0.64 mWh/cm 3 and a maximum power-density of 155 mW/cm 3 , which are higher than the values obtained for α- By 2050, global electrical energy demand is likely to reach 28 TW.1,2 Production of such a humungous amount of carbonneutral energy would necessitate the exploitation of renewable energy sources, like solar and wind.3,4 Furthermore, electrical energy storage would be required for unimpaired integration of electricity generated from these sources to the grid. For large-scale electrochemical storage to be viable, the materials used and devices produced need to be costeffective, besides being long-lasting and safe. Indeed, high specific energy and high power densities are of lesser concern in this regard. Accordingly, chemistries that make use of aqueous electrolytes are favorable candidates for large scale energy storage. It is noteworthy that as the renewable energy resources are intermittent, it would be desirable to store the energy from these sources as quickly as possible.Recently, supercapacitors (SCs) have emerged as a new class of storage devices that can be charged quickly with higher powerdensities than storage batteries. [5][6][7] However, their energy densities still remain limited and there is a definite need to increase it to cope with the global energy demand for electric traction and nextgeneration portable electronic devices. 8 The energy density of supercapacitors can be enhanced by increasing their capacitance as well as their operating-potential window, which can be achieved more easily with asymmetric supercapacitors (ASCs) than with the symmetric supercapacitors (SSCs) since, with suitable combination of positive and negative electrode materials, the operational potential window as high as 2 V has been achieved even with aqueous electrolytes. 6,[9][10][11][12][13][14] In recent years, efforts have been expended to explore several ASCs with different electrode materials based on redox-active transition-metal oxides, like RuO 2 ,

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Section: Resultssupporting

confidence: 62%

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

Sarkar

Pal

Mandal

et al. 2017

J. Electrochem. Soc.

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“…After 4000 cycles, a slow decay of capacitance appears, which could be assigned to the degradation of K + -conducting Nafion membrane from OH − attack. [51,52] Calculated from the GCD profiles of LS AC based supercapacitor at different current densities and electrolytes, Ragone plots are drawn to analyze the energy densities of LS AC based supercapacitors (Figure 5g). It can be seen that 1 m Li 2 SO 4 aqueous electrolyte solution indicates a higher internal resistance of 51.7 Ω and R CT of ≈24 Ω relative to other two supercapacitors, agreeing with previously reported results (Figure 5f).…”

mentioning

confidence: 99%

Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

Wu²,

Wang

et al. 2018

Advanced Science

127

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Aqueous symmetric carbon‐based supercapacitors (CSCs) are always the research focus for energy storage devices because of the virtue of low cost, inherent safety, and encouraging electrochemical stability. As is well‐known, so far most aqueous symmetric CSCs are subjected to low energy densities. Here, a symmetric supercapacitor comprising electrodes from biomass‐derived activated carbon and alkaline–acidic electrolyte is reported. This aqueous symmetric CSC demonstrates exceptional electrochemical performance with high stable working voltage of 2 V and attractive cycling stability of no capacitance loss over 10 000 cycles. Impressively, it shows a remarkable energy density of 36.9 W h kg−1 at 248 W kg−1 based on the total mass of the active materials, which is much higher than traditional aqueous symmetric CSCs, and a power density of 4083 W kg−1 with an energy density of 8.8 W h kg−1. The use of stable alkaline–acidic electrolyte provides an innovative technique to enhance the energy density of aqueous supercapacitors.

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“…[146] Stretchable carbon electrodes have been developed, including graphene papers and single-walled carbon nanotube films, that would promote the fabrication of the stretchable metal oxide/ hydroxide-carbon composite electrodes for high energy density flexible supercapacitors. [148] Fe 2 O 3 -carbon nanotube was prepared by chemical vapor deposition in the presence of Fe precursor and MnO 2carbon nanotube was prepared by redox deposition of MnO 2 on etched Fe 2 O 3 -carbon nanotube (Figure 16f, bottom). [148] Fe 2 O 3 -carbon nanotube was prepared by chemical vapor deposition in the presence of Fe precursor and MnO 2carbon nanotube was prepared by redox deposition of MnO 2 on etched Fe 2 O 3 -carbon nanotube (Figure 16f, bottom).…”

Section: Flexible Supercapacitorsmentioning

confidence: 99%

Metal Oxide and Hydroxide–Based Aqueous Supercapacitors: From Charge Storage Mechanisms and Functional Electrode Engineering to Need‐Tailored Devices

2019

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Energy storage devices that efficiently use energy, in particular renewable energy, are being actively pursued. Aqueous redox supercapacitors, which operate in high ionic conductivity and environmentally friendly aqueous electrolytes, storing and releasing high amounts of charge with rapid response rate and long cycling life, are emerging as a solution for energy storage applications. At the core of these devices, electrode materials and their assembling into rational configurations are the main factors governing the charge storage properties of supercapacitors. Redox‐active metal compounds, particularly oxides and hydroxides that store charge via reversible valence change redox reactions with electrolyte ions, are prospective candidates to optimize the electrochemical performance of supercapacitors. To address this target, collaborative investigations, addressing different streams, from fundamental charge storage mechanisms and electrode materials engineering to need‐tailored device assemblies, are the key. Over the last few years, significant achievements in metal oxide and hydroxide–based aqueous supercapacitors have been reported. This work discusses the most recent achievements and trends in this field and brings into the spotlight the authors' viewpoints.

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High-performance all-solid-state asymmetric stretchable supercapacitors based on wrinkled MnO₂/CNT and Fe₂O₃/CNT macrofilms

Abstract: A high voltage (2 V) asymmetric stretchable supercapacitor based on two metal oxide/CNT electrodes with high electrochemical and dynamic mechanical cycling stability is presented.

Cited by 124 publications

References 42 publications

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

Metal Oxide and Hydroxide–Based Aqueous Supercapacitors: From Charge Storage Mechanisms and Functional Electrode Engineering to Need‐Tailored Devices

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High-performance all-solid-state asymmetric stretchable supercapacitors based on wrinkled MnO2/CNT and Fe2O3/CNT macrofilms

Abstract: A high voltage (2 V) asymmetric stretchable supercapacitor based on two metal oxide/CNT electrodes with high electrochemical and dynamic mechanical cycling stability is presented.

Cited by 124 publications

References 42 publications

α-Fe2O3-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe2O3/C//α-Fe2O3/MnOxAsymmetric Supercapacitor

α-Fe2O3-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe2O3/C//α-Fe2O3/MnOxAsymmetric Supercapacitor

Fabricating an Aqueous Symmetric Supercapacitor with a Stable High Working Voltage of 2 V by Using an Alkaline–Acidic Electrolyte

Metal Oxide and Hydroxide–Based Aqueous Supercapacitors: From Charge Storage Mechanisms and Functional Electrode Engineering to Need‐Tailored Devices

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High-performance all-solid-state asymmetric stretchable supercapacitors based on wrinkled MnO₂/CNT and Fe₂O₃/CNT macrofilms

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor

α-Fe₂O₃-Based Core-Shell-Nanorod–Structured Positiveand Negative Electrodes for a High-Performance α-Fe₂O₃/C//α-Fe₂O₃/MnO_xAsymmetric Supercapacitor