A flexible high-performance symmetric quasi-solid supercapacitor based on Ni-doped MnO2 nano-array @ carbon cloth

Zhong, Rui; Xu, Meng‐Yao; Fu, Ning; Li, Rui; Zhou, Anan; Wang, Xiao Dong; Yang, Zhenglong

doi:10.1016/j.electacta.2020.136209

Cited by 60 publications

(20 citation statements)

References 40 publications

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“…The areal capacitance realized by our activated CNTFF electrode also exceeds that of most reported CBFF electrodes (Figure S11 and Table S1), such as electrochemically activated CFF (756 mF cm –2 at 6 mA cm –2 ), hydrothermally activated GFF (1060 mF cm –2 at 1 mA cm –2 ), thermally activated CFF (1324 mF cm –2 at 2 mA cm –2 ), thermally treated and acid-etched CFF (1385 mF cm –2 at 1 mA cm –2 ), and plasma-treated nitrogen-doped CFF (741 mF cm –2 at 0.5 mA cm –2 ) . Moreover, this capacitance is even superior to that of CFF-based hybrid electrodes, including PANI/CFF (1459.2 mF cm –2 at 10 mV s –1 ), PANI/GO/CFF (1122.8 mF cm –2 at 5 mV s –1 ), PPy@MnO 2 /CFF (1240 mF cm –2 at 1 mA cm –2 ), Fe 2 O 3 /CFF (862.12 mF cm –2 at 1 mA cm –2 ), Ni(OH) 2 /CFF (1248 mF cm –2 at 0.5 mA cm –2 ), and Ni-doped MnO 2 /CFF (1398.8 mF cm –2 at 4 mA cm –2 ) . It is expected that the areal capacitance can be further improved through incorporating with metal oxides and conducting polymers. ,, The areal capacitance for the activated CNTFF electrode decreased with the increasing current density (Figure e).…”

Section: Resultssupporting

confidence: 49%

“…22 Moreover, this capacitance is even superior to that of CFF-based hybrid electrodes, including PANI/CFF (1459.2 mF cm −2 at 10 mV s −1 ), 38 PANI/GO/CFF (1122.8 mF cm −2 at 5 mV s −1 ), 39 PPy@MnO 2 /CFF (1240 mF cm −2 at 1 mA cm −2 ), 40 Fe 2 O 3 /CFF (862.12 mF cm −2 at 1 mA cm −2 ), 41 Ni(OH) 2 /CFF (1248 mF cm −2 at 0.5 mA cm −2 ), 42 and Nidoped MnO 2 /CFF (1398.8 mF cm −2 at 4 mA cm −2 ). 43 It is expected that the areal capacitance can be further improved through incorporating with metal oxides and conducting polymers. 18,44,45 The areal capacitance for the activated CNTFF electrode decreased with the increasing current density (Figure 4e).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Activated Carbon Nanotube Fiber Fabric as a High-Performance Flexible Electrode for Solid-State Supercapacitors

Liang

Luo

Weng

et al. 2021

ACS Appl. Mater. Interfaces

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Owing to their features of excellent mechanical flexibility, high conductivity, and light weight, carbon-based fiber fabrics (CBFFs) are highly attractive as flexible electrodes for flexible solid-state supercapacitors (SCs). However, the achieved areal capacitance of most CBFFs is still unsatisfactory. Carbon nanotube fiber fabric (CNTFF) is a new kind of CBFF and could provide a potential alternative to high-performance flexible electrodes. Herein, we report the activation of CNTFF using a facile thermal oxidation and acid treatment process. The activated CNTFF shows an exceptional combination of large areal capacitance (1988 mF cm–2 at 2 mA cm–2), excellent rate performance (45% capacitance reservation at 100 mA cm–2), and outstanding cycle life (only 3% capacitance decay after 10,000 cycles). The constructed solid-state SC reaches a maximum energy density of 143 μWh cm–2 at 1000 μW cm–2 and a maximum power density of 30,600 μW cm–2 at 82 μWh cm–2. Additionally, this device possesses good rate performance along with superb cycle stability and excellent mechanical flexibility under various bending conditions. Our present work therefore offers a new opportunity in developing high-performance flexible electrodes for flexible energy storage.

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Section: Resultssupporting

confidence: 49%

Section: ■ Results and Discussionmentioning

confidence: 99%

Activated Carbon Nanotube Fiber Fabric as a High-Performance Flexible Electrode for Solid-State Supercapacitors

Liang

Luo

Weng

et al. 2021

ACS Appl. Mater. Interfaces

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“…Considering the environmental deterioration and energy crisis, it is highly desirable to develop high-efficiency and sustainable energy storage/delivery systems. , Carbon-based supercapacitors, as a burgeoning energy storage device, are currently coming into the spotlight because of their fast charge/discharge capability, superior power output, and long service life. − Since energy storage E is proportional to the square of the potential V in the formula E = 1/2 CV 2 ( C , capacitance), emerging wide-potential electrolyte systems are widely reported to upgrade the low-energy bottleneck caused by the finite working potential window of conventional aqueous supercapacitors at 1.23 V. , These reported devices generally employ commercial activated carbons (ACs) as the electrode materials, but there still exists significant disadvantages affecting the electrode/device capacitance C as follows: (1) hydrophobic carbon surface and weeny-sized pores (<0.5 nm) result in the under-utilization of ample electrode surface (>3000 m 2 g –1 ) toward large wide-potential electrolyte ions, and manifested interfacial charge accumulation is blocked for generating electrical double interlayers ,− and (2) tortuous/island-like pore structures cannot efficiently transfer viscous concentrated media owing to the boosted mass transportation resistance and electrolyte penetration pathway, simultaneously kinetically sacrificing energy/power supply. ,,, Hence, for better adaption to progressive wide-potential electrolytes, the ingenious design of high-capacity carbon electrodes with structurally interconnected channels and highly accessible surface area is a challenging and valuable ongoing task towards advanced supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Adapting a Kinetics-Enhanced Carbon Nanostructure to Li/Na Hybrid Water-in-Salt Electrolyte for High-Energy Aqueous Supercapacitors

Cheng

Liu

Zhu

et al. 2021

ACS Appl. Energy Mater.

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Wide-potential supercapacitor systems are highly anticipated to put aside the low-energy roadblock caused by the finite electrolysis voltage (1.23 V). However, poor electrolyte kinetics within the popular activated carbon electrodes usually downgrades the inherent high-power supply and long-cycle tolerance. To address this issue, multimodal porous carbon nanostructures are fabricated by the spontaneous cross-coupling between tetrachloro-1,4-benzoquinone (network joint) and four aromatic amines (chain motif) with varying bond dissociation energies, followed by temperature-programmed alkali thermolysis. The representative electrode with a broad ion-accessible platform (2539 m2 g–1) stands out by virtue of substantial electrosorption spaces (<1 nm micropores) and multi-level pore highways nested in open macroporous voids, enabling an instant ion-transport kinetics response (0.40 Ω s–0.5) and remarkable rate capability (80.4% capacitance retention up to 20 A g–1) in the H2SO4 electrolyte. Moreover, a LiOTf/NaOTf hybrid water-in-salt electrolyte is developed here to shift the water-splitting potential, wherein double Li+/Na+ cations can weaken strong Coulombic interactions for low migration barrier and dense interface accumulation. Consequently, the upgraded symmetric device using such concentrated aqueous medium, displays a boosted energy capacity of 39.2 Wh kg–1@550 W kg–1, an extraordinary power response of 22 kW kg–1 under high-energy delivery up to 28.2 Wh kg–1, and a durable service lifespan (85.5% energy retention over 10 000 successive cycles). This inspiring work provides structural insights for designing carbon electrodes adaptive to safe, wide-potential but kinetically sluggish electrolytes, realizing comprehensive energy-power improvements in supercapacitors.

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“…The electrochemical characteristics of MnO 2 are mainly influenced by the crystal phase, grain size, surface area, and composition ratio of the electrode materials. 18 To overcome the limitations and enhance the electrochemical performance of MnO 2 , most current studies have focused on synthesizing MnO 2 with different crystal phases or preparing binary and ternary composite materials (Table I). 14,17,[19][20][21][22] Nanocomposite material structures have been created by adding another transition metal compound to MnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Huang

Zhang

2021

J. Electron. Mater.

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In this study, the properties of supercapacitors were improved by doping nanomaterials. Transition metal oxides (i.e., MnO 2 ) with Faraday's reduction-oxidation (redox) reaction and silver nanowires (AgNWs) with high conductivity were doped into activated carbon based material to prepare thin-film electrodes. The results indicated that doping with AgNWs can effectively improve the conductivity of the thin film electrode. A conductive network was constructed between activated carbon and MnO 2 , and the optimal balance between conductivity and specific surface area was achieved through suitable doping. Thus, the electrochemical efficacy of the developed supercapacitor was effectively improved, and its specific capacitance increased from 240.14 F/g before doping to 1020.91 F/g (by 3.25 times) after doping. In addition, the prepared thin-film electrodes had favorable reproducibility at different voltage scan rates. Electrochemical impedance spectroscopy indicated a noticeable decrease in the charge transfer resistance of the thin-film electrodes from 1.46 Ω before doping to 0.66 Ω after doping. The doping of the two nanomaterials preserved their respective advantages and created a synergistic effect. The doping of transition metal oxides with metal AgNWs has applications in thin-film preparation for different types of supercapacitors, thereby enhancing the capacitance effect.

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A flexible high-performance symmetric quasi-solid supercapacitor based on Ni-doped MnO2 nano-array @ carbon cloth

Cited by 60 publications

References 40 publications

Activated Carbon Nanotube Fiber Fabric as a High-Performance Flexible Electrode for Solid-State Supercapacitors

Activated Carbon Nanotube Fiber Fabric as a High-Performance Flexible Electrode for Solid-State Supercapacitors

Adapting a Kinetics-Enhanced Carbon Nanostructure to Li/Na Hybrid Water-in-Salt Electrolyte for High-Energy Aqueous Supercapacitors

Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

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