Achieving high-energy density and superior cyclic stability in flexible and lightweight pseudocapacitor through synergic effects of binder-free CoGa2O4 2D-hexagonal nanoplates

Javed, Muhammad Sufyan; Shah, Syed Shoaib Ahmad; Najam, Tayyaba; Siyal, Sajid Hussain; Hussain, Shahid; Saleem, Muhammad; Zhao, Zhijuan; Mai, Wenjie

doi:10.1016/j.nanoen.2020.105276

Cited by 131 publications

(56 citation statements)

References 40 publications

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“…However, SCs still have relatively low energy outputs compared to batteries. 4 The electrochemical performance of electrode materials is critical to enhancing the overall properties of SCs. 5 The capacitance is derived from the electric double layer or the redox-made Faradaic pseudocapacity mechanism of the electrode material.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Highly Porous 2D Bimetallic Sulfide ZnS/FeS Composite Nanosheets as an Advanced Negative Electrode Material for Supercapacitors

et al. 2021

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Metal sulfides delivered much better electrochemical performance over metal oxides due to the extended potential window with high conductivity and therefore are much investigated in the field of energy storage applications. Herein, binder-free two-dimensional bimetallic (ZnS/FeS) interconnected composite nanosheet arrays are synthesized on carbon cloth (2D-ZFS@CC) as an innovative negative electrode material for supercapacitors. The 2D-ZFS@CC exhibits improved capacitance (1367.5 F g–1/1641 C g–1 at 3 A g–1), rate-capability (58.5% at 10-fold high current density), and capacitance retention (87%) over bimetallic oxide (ZnFe2O4). This is accomplished by intelligently regulating the morphology to generate numerous pores with a wide accessible surface area and high porosity, which favors high capacitance, whereas the binder-free nature of the active material promotes fast charge transfer characteristics. Moreover, the kinetic analysis suggested that the 2D-ZFS@CC electrode stored charge based on the hybrid charge storage mechanism with b values of 0.70 and 0.72 for anodic and cathodic peaks, respectively. These results demonstrate the significant potential application of 2D-ZFS@CC as a negative electrode material for next-generation supercapacitor electrodes.

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Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Highly Porous 2D Bimetallic Sulfide ZnS/FeS Composite Nanosheets as an Advanced Negative Electrode Material for Supercapacitors

et al. 2021

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“…To investigate the reason behind the improved performance of AlCu-NiCoP, the diffusion coefficients, electrochemically active surface area (ECSA), and EIS were measured. First, the diffusion coefficients of all electrodes are evaluated based on the following Randles–Sevcik equation where I p , v , A , C , n , and D refer to the peak current, scan rate, tested area of the working electrode, electrolyte concentration, the number of transfer electrons, and diffusion coefficient, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…First, the diffusion coefficients of all electrodes are evaluated based on the following Randles−Sevcik equation. 58…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Zeolitic Imidazole Framework Sacrificial Template-Assisted Synthesis of NiCoP Nanocages Doped with Multiple Metals for High-Performance Hybrid Supercapacitors

Lyu

Antink

Lee

et al. 2021

ACS Appl. Energy Mater.

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Metal phosphides have great potential for electrochemical energy-storage devices and electrocatalysis. Although monometallic and bimetallic phosphides have been extensively studied, the preparation of more complex metal phosphides remains challenging and it is necessary to further expand the available design space. Herein, we report a universal method to dope various metal cations into NiCoP nanocages (M-NiCoP, M = Al, Cu, Cr, Zn). Interestingly, the method can also be expanded to allow the incorporation of two to four metal dopants simultaneously (AlCu-NiCoP, AlZn-NiCoP, CrZn-NiCoP, AlCrCu-NiCoP, AlCrCuZn-NiCoP). To investigate the effect of incorporating multiple dopants, AlCu-NiCoP was used as the electrode material for supercapacitors, showing enhanced capacity and cycling stability compared to Al-NiCoP, Cu-NiCoP, and NiCoP electrodes. The superior electrochemical performance is attributed to the increased number of active sites, improved ion-diffusion kinetics, and a modulated electronic structure. An aqueous hybrid supercapacitor with AlCu-NiCoP as the positive electrode and activated carbon as the negative electrode was assembled and demonstrated a high energy density of 62.8 Wh kg–1 at a power density of 750 W kg–1 with good cycling stability.

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“…The portion of current contributed by the pseudocapacitive process at various sweep rates is computed by finding the values of constants (k 1 and k 2 ) from the slope and y-intercept of the plot [v 1/2 versus i/v 1/2 ] (Figure S10, Supporting Information), respectively. [46] i = av b…”

Section: Discussionmentioning

confidence: 99%

Unprecedented Dual Role of Polyaniline for Enhanced Pseudocapacitance of Cobalt–Iron Layered Double Hydroxide

Mahmood

Zhao

Javed

et al. 2022

Macromol. Rapid Commun.

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Creating nanosized pores in layered materials can increase the abundant active surface area and boost potential applications of energy storage devices. Herein, a unique synthetic strategy based on polyaniline (PANI) doped 2D cobalt-iron layered double hydroxide (CoFe-LDH/P) nanomaterials are designed, and the formation of pores at low temperature (80 °C) is developed. It is found that the optimized concentration of PANI creates the nanopores on the CoFe-LDH nanosheets among all other polymers. The well-ordered pores of CoFe-LDH/P allow the high accessibility of the redox-active sites and promote effective ion diffusion. The optimized CoFe-LDH/P2 cathode reveals a specific capacitance 1686 (1096 Cg −1 ) and 1200 Fg −1 (720 Cg −1 ) at 1 and 30 Ag −1 respectively, a high rate capability (71.2%), and a long cycle life (98% over 10 000 cycles) for supercapacitor applications. Charge storage analysis suggests that the CoFe-LDH/P2 electrode displays a capacitive-type storage mechanism (69% capacitive at 1 mV s −1 ). Moreover, an asymmetric aqueous supercapacitor (CoFe-LDH/P2//AC) is fabricated, delivering excellent energy density (75.9 Wh kg −1 at 1124 W kg −1 ) with outstanding stability (97.5%) over 10 000 cycles. This work opens a new avenue for designing porous 2D materials at low temperature for aqueous energy storage devices.

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Achieving high-energy density and superior cyclic stability in flexible and lightweight pseudocapacitor through synergic effects of binder-free CoGa2O4 2D-hexagonal nanoplates

Cited by 131 publications

References 40 publications

Design and Fabrication of Highly Porous 2D Bimetallic Sulfide ZnS/FeS Composite Nanosheets as an Advanced Negative Electrode Material for Supercapacitors

Design and Fabrication of Highly Porous 2D Bimetallic Sulfide ZnS/FeS Composite Nanosheets as an Advanced Negative Electrode Material for Supercapacitors

Zeolitic Imidazole Framework Sacrificial Template-Assisted Synthesis of NiCoP Nanocages Doped with Multiple Metals for High-Performance Hybrid Supercapacitors

Unprecedented Dual Role of Polyaniline for Enhanced Pseudocapacitance of Cobalt–Iron Layered Double Hydroxide

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