Free-standing sulfonated graphene-polypyrrole-polyethylene glycol foam for highly flexible supercapacitors

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

“…These transition temperatures are in accordance with the T m ’s and T c ’s of pure PEG and C–PI/KNF@PEG/CoFe 2 O 4 composite presented in Figure S17 (Supporting Information). As seen in Figure f, pure PEG has a low thermal conductivity of 0.201 W m –1 K –1 due to its organic nature, which is in good agreement with the corresponding data reported in the literature. , For comparison, pure CoFe 2 O 4 NPs as an inorganic oxide exhibit a high thermal conductivity of 1.050 W m –1 K –1 . As a result, the thermal conductivity of the PEG/CoFe 2 O 4 composite increases from 0.201 (pure PEG) to 0.283 W m –1 K –1 .…”

“…Moreover, PPy contains abundant nitrogen atoms and exhibits hydrophilicity, which is beneficial to the shape stabilization of PEG . The hydrogen bonding and electrostatic interactions between PPy and PEG can improve a interfacial forces between the outer PPy layer and inner C–PI/KNF@PEG/CoFe 2 O 4 composite. , …”

“…47 The hydrogen bonding and electrostatic interactions between PPy and PEG can improve a interfacial forces between the outer PPy layer and inner C−PI/KNF@ PEG/CoFe 2 O 4 composite. 31,48 The chemical and crystalline structures of the C−PI/KNF@ PEG/CoFe 2 O 4 @PPy composite were characterized by EDX, FTIR, and XRD analyses. The elemental mapping images identified the homogeneously distributed C, O, N, Fe, and Co elements in the C−PI/KNF@PEG/CoFe 2 O 4 and C−PI/ KNF@PEG/CoFe 2 O 4 @PPy composites (Figure S13, Supporting Information).…”

Polypyrrole micro/nanostructures and their soft materials in versatile forms: construction and applications

“…During conventional pyrrole chemical oxidative polymerization, PPy is prone to deposit on the surface that contacts the polymerization medium, which provides a facile way to construct PPy films on desired substrates. Polypyrrole can be coated on substrates including air-laid paper, 83 sponge 84 or foam, 85,86 cotton cloth, 87 fibres, 88 plastics, 89 carbon cloth or carbonized paper, 90,91 metal meshes 92 and even leather. 93 Usually, hydrophilic surfaces are much easier to be coated than hydrophobic surfaces.…”

“…91,124 For example, a composite electrode prepared by depositing PPy on a carbonized silk fibre surface 88 exhibited excellent area capacitance up to 4040 mF cm À2 at 2 mA cm À2 . Another way is to construct composites composed of PPy and high-specific-area nanomaterials, including carbon nanotubes, 120 graphene, 56,125 MXene 126,127 and metal organic frameworks (MOFs). 128 Wang et al reported that the salt out effect of ammonium sulfate solution could induce winkles on the surface of gelatin-based PPy hydrogels, resulting in enhancement of capacitance.…”