Fabrication and characterization of MnO2 based composite sheets for development of flexible energy storage electrodes

Farid, Tanveer; Islam, Adeel; Masood, Aneeqa; Iqbal, Faisal; Rafique, Mohsin; Razaq, Aamir

doi:10.1016/j.ceramint.2018.03.192

Cited by 11 publications

(6 citation statements)

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“…The Nyquist plot reveals a low R i of 4.75 Ω and a low R e of 4.0 Ω (Figure C). The EIS profile of the ASC also reveals the higher conductivity of CNT@FW-RC than that of carbonized wood and cellulose fiber-based supercapacitor devices. ,,,− Calculated from GCD curves, our ASC is found to deliver volumetric specific capacitance values of 398, 308, 257, and 173 mF cm –3 at the current densities of 0.5, 0.7, 1.0, and 2.5 mA cm –2 , respectively. The ASC device exhibited excellent rate performance by showing a volumetric specific capacitance of 132 mF cm –3 at the current density of 5.0 mA cm –2 .…”

Section: Resultsmentioning

confidence: 88%

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Porous Flexible Wood Scaffolds Designed for High-Performance Electrochemical Energy Storage

Farid

Wang

Rafiq

et al. 2022

ACS Sustainable Chem. Eng.

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Natural wood has been physically or chemically modified to create new hierarchical structures for vast applications. We report herein the facile methods to synthesize porous flexible conductive wood for high-performance energy storage. Our delignification and densification increase micro−mesopores for higher surface area but decrease macropores to improve the scaffold's density, thus leading to ultra-high flexibility and excellent mechanical strength. Such hydroxyl-enriched flexible wood scaffolds (FW-RC) are readily chemically deposited with carbon nanotubes (CNTs) to promote fast electron/ion transport and a lower internal resistance (ca. 2.1 Ω). Interestingly, the as-prepared CNT@FW-RC electrode exhibited organic redox reactions originating from oxygen-containing groups on the wood surface. The electrode showed an areal specific capacitance of 640 mF cm −2 at a 0.1 mA cm −2 scan rate and over 93% capacitance retention for 10,000 galvanostatic charge/discharge cycles, outperforming most reported carbonized wood electrodes. Asymmetric supercapacitors demonstrated a maximum energy density of 108 mW h L −1 at the power density of 2.06 W L −1 , which retains a value of 36 mW h L −1 at the highest volumetric power density of 20.5 W L −1 . Further in situ electrodeposition of conducting polymers on the CNTs@wood electrodes was explored for scalable energy storage devices. The design strategies surely provide guidance on constructing porous flexible wood-based hierarchical nanostructures for emerging applications, utilizing surface functional groups of the wood surface for organic redox reactions.

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Section: Resultsmentioning

confidence: 88%

“…Versatile and innovative functionalization techniques have been introduced for wood components (e.g., cellulose and lignin) due to their enhanced accessibility to functional groups. − However, the functionalization of bulk wood is challenging. Recently, various polymerization approaches have been utilized to functionalize NW scaffolds.…”

Section: Resultsmentioning

confidence: 99%

Porous Flexible Wood Scaffolds Designed for High-Performance Electrochemical Energy Storage

Farid

Wang

Rafiq

et al. 2022

ACS Sustainable Chem. Eng.

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“…That's why they have limited applications in biomedical systems, energy storage devices, catalytic support, pollutant removal, biosensors, artificial muscles, thermal insulations, and actuators. [77][78][79][80][81][82] In recent years, research has focused on developing nature-friendly and cost-efficient H&As using top-down methods directly from wood. Processing wood into H&As is relatively straightforward.…”

Section: Wood Hydrogels and Aerogelsmentioning

confidence: 99%

“…These H&As produced by bottom‐up approaches consume much energy and time; lack mechanical strength and homogeneity in structure. That's why they have limited applications in biomedical systems, energy storage devices, catalytic support, pollutant removal, biosensors, artificial muscles, thermal insulations, and actuators 77–82 . In recent years, research has focused on developing nature‐friendly and cost‐efficient H&As using top‐down methods directly from wood.…”

Section: Wood Hydrogels and Aerogelsmentioning

confidence: 99%

Transforming wood as next‐generation structural and functional materials for a sustainable future

Farid

Rafiq

Ali

et al. 2021

EcoMat

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Wood as an ecofriendly and renewable natural material has been extensively modified through various delignification protocols to preserve its natural structure and fiber direction. The increased porosity and permeability of wood scaffold thus provide excellent opportunities for material infiltration and densification. Wood features in hierarchical structure and biocompatibility are combined with cutting‐edge processings to overcome the weaknesses for vast applications. These new modifications have explored the great potentials of wood as a next‐generation structural and functional material. This review updates the state‐of‐the‐art physicochemical modifications and strategies to prepare versatile wood hydrogels, aerogels, membranes, and fibers with different physicochemical features. Discussion is elaborated to explore the immense breadth of wood as next‐generation material for applications in biomedical, energy storage, sensors, separation, and buildings. Finally, the main challenges of wood scaffold engineering are represented along with potential solutions and directions for developing wood‐based high‐performance structural and functional materials.

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“…To address the rigid structure, Zn based flexible composites are reported in literature with better electrochemical results. Lignocelluloses (LC) fibers known as natural fibers (extracted from pollutant resources) can be suitable candidate to provide a flexible matrix by employing as substrate/binder 17–21 . In presented study, ZHS 3D spheres were synthesized by facile microwave method and furthermore LC fibers extracted from Popeye stem employed as substrate for growth of ZHS microspheres to fabricate robust and conductive paper sheets for energy storage applications.…”

Section: Introductionmentioning

confidence: 99%

Natural fibers and zinc hydroxystannate 3D microspheres based composite paper sheets for modern bendable energy storage application

Ullah

Kainat

Manzoor

et al. 2022

J of Applied Polymer Sci

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For modern high-tech flexible energy storage devices, it becomes important to synthesize micro-/nanostructures as per the required shape and morphology with superior physical and electro-active characteristics. This work shares the fabrication and characterization of ZnSn(OH) 6 (Zinc hydroxystannate [ZHS]) prepared by facile microwave-assisted technique and furthermore converted into flexible sheets by employing lignocelluloses (LC) known as natural fibers, collected from Carica papaya leaf petiole as a substrate to provide the flexible matrix. X-ray diffraction measurements confirm the successful crystalline structure of ZHS. Scanning electron microscopy and transmission electron microscopy showed the solid spherical structure of ZHS microspheres. Fourier transform infrared spectrometry and Raman spectroscopy confirmed the composite formation of ZHS and LC-based composite sheets (ZHS/LC sheets). Electrochemical measurements that is, cyclic voltammetry (CV), Galvanostatic charge/discharge, and electrochemical impedance (EIS) spectroscopy revealed the electroactive behavior of ZHS/LC paper sheets as working electrode for energy storage applications. CV measurements revealed the specific capacitance of 100 F/g and EIS measurements confirmed the decrease in the resistance of LC fiber after the growth of ZHS microspheres. Presented flexible ZHS based paper sheets will be highly feasible for the modern bendable/flexible/disposable energy storage applications.

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Fabrication and characterization of MnO2 based composite sheets for development of flexible energy storage electrodes

Cited by 11 publications

References 50 publications

Porous Flexible Wood Scaffolds Designed for High-Performance Electrochemical Energy Storage

Porous Flexible Wood Scaffolds Designed for High-Performance Electrochemical Energy Storage

Transforming wood as next‐generation structural and functional materials for a sustainable future

Natural fibers and zinc hydroxystannate 3D microspheres based composite paper sheets for modern bendable energy storage application

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