Transition Metal Salt Doping on Polypyrrole/MWCNT Composites for Supercapacitor Applications

Karthikeyan, G.; Das, C. K.

doi:10.1002/masy.201250512

Cited by 5 publications

(1 citation statement)

References 23 publications

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“…42,43 The peaks at 1190, 1096, and 924 cm −1 correspond to in-plane and out-of-plane N−H bending vibrations, while the peaks at 1045 and 793 cm −1 are attributed to in-plane and out-of-plane C−H bending, respectively. 44,45 The peak at 964 cm −1 belongs to ring deformation. 46 Then, when MWCNTs and PPy (with or without Cl-doping) were combined (namely, Cl-PPy@MWCNTs and PPy@ MWCNTs), every peak (1549, 1467, 1303, 1190, 1096, 1045, 964, 924, and 793 cm −1 ) appeared but redshifted except that at 964 cm −1 , indicating that PPy is successfully coated on the nanofibers of MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

Removal and Recovery of Gaseous Elemental Mercury Using a Cl-Doped Protonated Polypyrrole@MWCNTs Composite Membrane

Hao

Zeng

Mao

et al. 2022

Environ. Sci. Technol.

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Due to the restrictions on mercury mining, recovering the mercury from mercury-containing waste is attracting increasing attention. This study successfully achieved the removal and recovery of gaseous elemental mercury (Hg0) by using membrane technology. A novel composite membrane of Cl-doped protonated polypyrrole-coated multiwall carbon nanotubes (Cl-PPy@MWCNTs) was fabricated in which MWCNTs acted as the framework to support the active component Cl-PPy. The morphology, structure, and composition of the prepared membranes were determined by field emission scanning electron microcopy, energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, etc. The composite membrane exhibited an excellent performance in Hg0 removal (97.3%) at a high space velocity of 200,000 h–1. The dynamical adsorption capacity of Hg0 was 3.87 mg/g when the Hg0 breakthrough reached 10%. The adsorbed Hg0 could be recovered/enriched via a leaching process using acidic NaCl solution; meanwhile, the membrane was regenerated. The recovered mercury was identified in the form of Hg2+, with a recovery efficiency of over 99%. Density functional theory calculations and mechanism analysis clarified that the electrons of Hg0 transported to the delocalized electron orbits of protonated PPy and then combined with Cl– to form Hg2Cl2/HgCl2. Finally, we first demonstrated that the analogous protonated conductive polymers (e.g., polyaniline) also possessed good Hg0 removal ability, implying that such species may offer more outstanding answers and attract attention in future.

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Section: Resultsmentioning

confidence: 99%

Removal and Recovery of Gaseous Elemental Mercury Using a Cl-Doped Protonated Polypyrrole@MWCNTs Composite Membrane

Hao

Zeng

Mao

et al. 2022

Environ. Sci. Technol.

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Fabrication of transition‐metal‐doped polypyrrole/multiwalled carbon nanotubes nanocomposites for supercapacitor applications

Dhibar

Sahoo

Das

2013

J of Applied Polymer Sci

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Copper chloride (CuCl2)‐doped polypyrrole (PPy)/multiwalled carbon nanotube (MWCNTs) nanocomposites were synthesized by an in situ oxidative polymerization method with ammonium persulfate as the oxidant in HCl medium and investigated as electrode materials for supercapacitors. The interaction of metal cations (Cu2+ ions) with PPy was confirmed by Fourier transform infrared spectroscopic analysis. The morphology of the nanocomposites was characterized by field emission scanning electron microscopy and high‐resolution transmission electron microscopy. Electrochemical characterizations of the composites materials were carried out by a three‐electrode probe method, where platinum and a saturated standard calomel electrode were used as the counter and reference electrodes, respectively. A 1M KCl solution was used as the electrolyte for all of the electrochemical characterizations. The transition‐metal‐ion doping enhanced the electrochemical properties of the conducting polymer. Among all of the composites, the CuCl2‐doped PPy/MWCNTs showed the highest specific capacitance value of 312 F/g at a 10 mV/s scan rate. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Enhanced Electrochemical Performance of Nanocellulose/PPy·CuCl2 Electrodes for All-Cellulose-Based Supercapacitors

Wesling

Dias

Müller

et al. 2019

Journal of Elec Materi

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Transition Metal Salt Doping on Polypyrrole/MWCNT Composites for Supercapacitor Applications

Cited by 5 publications

References 23 publications

Removal and Recovery of Gaseous Elemental Mercury Using a Cl-Doped Protonated Polypyrrole@MWCNTs Composite Membrane

Removal and Recovery of Gaseous Elemental Mercury Using a Cl-Doped Protonated Polypyrrole@MWCNTs Composite Membrane

Fabrication of transition‐metal‐doped polypyrrole/multiwalled carbon nanotubes nanocomposites for supercapacitor applications

Enhanced Electrochemical Performance of Nanocellulose/PPy·CuCl2 Electrodes for All-Cellulose-Based Supercapacitors

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