Reactive MnO2 template-assisted synthesis of double-shelled PPy hollow nanotubes to boost microwave absorption

Gu, Huiling; Huang, Ji; Li, Na; Yang, Hua; Chen, Gang; Dong, Chengjun; Gong, Chunhong; Guan, Hongtao

doi:10.1016/j.jmst.2022.11.010

Cited by 49 publications

(11 citation statements)

References 38 publications

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“…Furthermore, we explored an alternative approach to fabricate rGO/PPy composite films by immersing rGO/MnO 2 -60 samples in a HCl/pyrrole solution to oxidatively polymerize pyrrole using the reactive MnO 2 as an oxidizing agent. 49 As seen from the SEM images of as-prepared rGO/PPy samples in Figure S15, with increasing pyrrole concentrations, the resulting PPy films composed of nanoparticles become thicker. The CV and GCD tests of the electrodes are presented in Figure S16 and the capacitance values are listed in Table S6 in which the rGO/PPy-4 sample can achieve an optimal capacitance of 339.7 F g −1 at 1 A g −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Oxidative MnO₂ Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Ye,

Xu,

Cao

et al. 2024

Langmuir

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Improving the morphological structure of active materials is a reliable strategy for the fabrication of highperformance supercapacitor electrodes. In this study, we introduce a feasible approach to constructing the graphene/polypyrrole (PPy) composite film implanted onto the current collector through a two-step electrochemical deposition method utilizing MnO 2 as an intermediary template. The reduced graphene oxide (rGO) hydrogel film is first hydrothermally grown on a carbon cloth (CC) substrate to obtain a porous rGO@CC electrode on which MnO 2 is electrodeposited. Then the as-prepared rGO/MnO 2 @CC electrode is subjected to the electrochemical polymerization of pyrrole, with MnO 2 acting as an oxidizing template to facilitate the oxidative polymerization of pyrrole, ultimately yielding an rGO/ PPy composite film on CC. The PPy synthesized via this methodology exhibits a distinctive interconnected structure, resulting in superior electrochemical performance compared with the electrode with PPy directly electrodeposited on rGO@CC. The optimized electrode achieves an impressive specific capacitance of 583.6 F g −1 at 1 A g −1 and retains 83% of its capacitance at 20 A g −1 , with a capacitance loss of only 9.5% after 5000 charge−discharge cycles. The corresponding all-solid-state supercapacitor could provide a high energy density of 22.5 Wh kg −1 and a power density of 4.6 kW kg −1 , with a capacitance retention of 82.7% after 5000 charge− discharge cycles. Furthermore, the device also demonstrates good flexibility performance upon bending at 90 and 180°. This work presents an innovative method for the preparation of carbon material/conducting polymer electrodes with specific structural characteristics and superior performance.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Oxidative MnO₂ Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Ye,

Xu,

Cao

et al. 2024

Langmuir

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“…In all three hybrids, a broad peak ranging from 23°to 28°w as observed, which was attributed to the PPy polymer chain. 33 The characteristic peaks at 6.1°and 60.6°represented the (002) and (110) crystal planes of MXene, respectively. 43 This suggests a well-mixed state of PPy and MXene within the hybrids.…”

Section: Resultsmentioning

confidence: 99%

Polymorphic Polypyrrole-Modified MXene Nanosheets for Broadband Microwave Absorption

Shen,

Wang,

Huang

et al. 2024

ACS Appl. Nano Mater.

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The absorption of microwaves is significantly influenced by the structure of the absorber. Typically, the electromagnetic parameters can be adjusted by modifying the structure of the absorber. In this work, a novel approach is proposed to enhance microwave absorption properties by adjusting the impedance matching of MXene nanosheets. MXene/PPy hybrids with loose lamellar structure are synthesized through self-assembly of positively charged polypyrrole (PPy) and MXene nanosheets with negative charges, facilitated by electrostatic and hydrogen-bonding interactions. The impact of polymorphic PPy on the electromagnetic parameters and microwave absorption properties of MXene nanosheets is comprehensively explored. It is found that the addition of PPy with different morphologies can effectively tune the electromagnetic parameters of the MXene nanosheets. Particularly, the microwave absorption capabilities are significantly enhanced when PPy nanopaperclips are uniformly adsorbed on the surface of the MXene nanosheets. This enhancement is attributed to the favorable impedance match between PPy nanopaperclips and MXene nanosheets along with the exceptional attenuation capabilities of PPy. A minimum reflection loss (RLmin) of −47.85 dB is achieved at an ultrathin matched thickness of 1.6 mm, and the maximum effective absorption bandwidth (EABmax) is 5.01 GHz at 1.9 mm for the prepared MXene/PPy nanopaperclip hybrid with a filling rate of 20%. Furthermore, a bandwidth with 99% absorption efficiency of 15.4 GHz (2.4–18.0 GHz) can be attained when the thickness of the absorber ranges from 1.6 to 10.0 mm. It is anticipated that this work will provide valuable insights for the manufacture of high-performance microwave absorbers.

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“…In this work, freeze drying assisted with in situ thermally structure-directing techniques was applied to fabricate composite aerogels with orientation design. 21,22 Carboxymethyl cellulose sodium (CMC) was utilized as the molding agent and structure-directing agent, which possesses unique physical properties like good solubility/dispersibility and easy recombination at high temperature. 23–25 Benefitting from the thermal-assisted in situ bonding process, the obtained composite aerogel exhibits strong interface contact and mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Thermally assisted layer–layer crosslinking towards programmable evolution of pore structures for tunable electromagnetic response capability

Quan,

Chen,

Lin

et al. 2024

Nanoscale

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Reactive MnO2 template-assisted synthesis of double-shelled PPy hollow nanotubes to boost microwave absorption

Cited by 49 publications

References 38 publications

Oxidative MnO₂ Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Oxidative MnO₂ Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Polymorphic Polypyrrole-Modified MXene Nanosheets for Broadband Microwave Absorption

Thermally assisted layer–layer crosslinking towards programmable evolution of pore structures for tunable electromagnetic response capability

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Reactive MnO2 template-assisted synthesis of double-shelled PPy hollow nanotubes to boost microwave absorption

Cited by 49 publications

References 38 publications

Oxidative MnO2 Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Oxidative MnO2 Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Polymorphic Polypyrrole-Modified MXene Nanosheets for Broadband Microwave Absorption

Thermally assisted layer–layer crosslinking towards programmable evolution of pore structures for tunable electromagnetic response capability

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Product

Resources

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Oxidative MnO₂ Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes

Oxidative MnO₂ Template Assisted Electrochemical Fabrication of Graphene/Polypyrrole Supercapacitor Electrodes