Graphene nanosheets-polypyrrole hybrid material as a highly active catalyst support for formic acid electro-oxidation

Yang, Sudong; Shen, Chengmin; Liang, Yanyu; Tong, Hao; He, Wei; Shi, Xinzhi; Zhang, Xiaogang; Gao, Hongjun

doi:10.1039/c1nr10371g

Cited by 98 publications

(58 citation statements)

References 34 publications

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“…It could be found that there is the mass loss at about ∼120°C for DBS‐doped PPy, while this mass loss existed at ∼160°C for C‐GO‐composited PPy. The major mass loss in the first stage was attributed to the decomposition of the PPy backbones and carboxyl in C‐GO from 120 to 580°C (S. Yang et al, ), and the rate of mass loss of DBS‐doped PPy (76%) was larger than 58% of C‐GO‐composited PPy, indicating that the polarity interaction between the carboxyl groups from C‐GO and imino groups in PPy could improve the thermostability in this stage (Cheng et al, ). After the first stage, the mass loss should result from the degradation of skeleton carbon of polymers in 580 to 1,000°C (Xie et al, ).…”

Section: Resultsmentioning

confidence: 99%

Preparation of carboxylic graphene oxide‐composited polypyrrole conduits and their effect on sciatic nerve repair under electrical stimulation

Chen

Liu

Huang

et al. 2019

J Biomedical Materials Res

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Carboxylic graphene oxide‐composited polypyrrole/poly‐l‐lactic acid (C‐GO/PPy/PLLA) films were fabricated by electrochemical deposition of C‐GO‐composited PPy on PLLA fibers‐film, and their conductivity and tensile strength (∼4.6 S/cm and 26.4 MPa, respectively) were stably remained after the immersion of 4 weeks, due to the hydrogen bond interaction between graphene oxide's carboxylic groups and pyrrole's imino groups. Their specific surface areas of ∼57.5 m2/g and pore volume of ∼0.02 cm3/g were significantly larger than those of PPy/PLLA films, due to the addition of C‐GO nanosheets. Then, C‐GO/PPy/PLLA conducting conduit with 2 mm inner diameter was prepared to bridge 10 mm sciatic nerve defect of rats, and the direction of fiber‐axis in the conduit was the same as the conduit central axis. Electrical stimulation (ES) of 1 V and 20 Hz through the conducting conduit was exerted on the defect site. The results of in vivo electrophysiological and histological evaluation indicated that, the sciatic nerve defect could be repaired in C‐GO/PPy/PLLA conduit, moreover the re‐innervated gastrocnemius muscle and nerve conduction in C‐GO/PPy/PLLA conduit & ES group were obviously better than the conduit without ES group. The results of transmission electron microscope analysis also demonstrated that the mean thickness of myelin sheath and diameter of axon in C‐GO/PPy/PLLA conduit & ES group were significantly larger than those without ES, suggesting that the repair efficiency of ES & conduit group was closer to that of autograft group. These results indicated the great potential of C‐GO/PPy/PLLA with the in vivo ES in the application of sciatic nerve repair.

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Section: Resultsmentioning

confidence: 99%

Preparation of carboxylic graphene oxide‐composited polypyrrole conduits and their effect on sciatic nerve repair under electrical stimulation

Chen

Liu

Huang

et al. 2019

J Biomedical Materials Res

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“…At present, a promising approach to deposit Pt-based catalyst on the surface of graphene is the surfactant stabilized colloidal method, in which the surfactants are applied to stabilize the Pt-based colloidal solutions before Pt-based catalysts anchor to the graphene surface [9,12,13]. Generally, cationic moieties [14] and polymers [15] have been used as a surfactant. The ionic moieties with a low molecular weight (normally quaternary ammonium salts) [9,16] have been widely applied as a stabilizer to reduce the Pt precursor reduction rate and prevent Pt colloids from aggregation.…”

Section: Introductionmentioning

confidence: 99%

Graphene-supported platinum catalyst prepared with ionomer as surfactant for anion exchange membrane fuel cells

Zeng

Zhao

et al. 2015

Journal of Power Sources

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“…4 Thus, many hybrid materials were synthesized that combine conducting polymers with non-conducting polymers, 5,6 metallic or metal-containing components, 7,8 carbon in its different allotropic forms, 9,10 and biological species. 11,12 Each time, the aim has been to obtain a material with new or improved properties compared to the individual components.…”

Section: Introductionmentioning

confidence: 99%

Microstructured electrodeposited polypyrrole–phthalocyanine hybrid material, from morphology to ammonia sensing

et al. 2012

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Hybrid materials combining polypyrrole with ionic macrocycles as counterions are electrosynthesized at the surface of platinum interdigitated electrodes. The chemical composition of the hybrid films is characterized by infrared reflexion absorption spectroscopy (IRRAS) and glow discharge optical emission spectroscopy (GDOES) and their morphology is studied by a range of techniques such as optical topomicroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The obtained films reveal to be more homogeneous, with smaller crystallites, compared to polypyrrole synthesized with small counterions. Finally, the films exhibit a higher sensitivity to ammonia, with a very good reversibility and with a stable response in a broad range of relative humidity. Overall, we present the advantages of combining ionic phthalocyanines with polypyrrole in enhancing the properties of the final material. Synergetic effects in the structure and properties of polypyrrolephthalocyanine materials open the way to their development in the field of hybrid material and their use in chemosensing.

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Graphene nanosheets-polypyrrole hybrid material as a highly active catalyst support for formic acid electro-oxidation

Cited by 98 publications

References 34 publications

Preparation of carboxylic graphene oxide‐composited polypyrrole conduits and their effect on sciatic nerve repair under electrical stimulation

Preparation of carboxylic graphene oxide‐composited polypyrrole conduits and their effect on sciatic nerve repair under electrical stimulation

Graphene-supported platinum catalyst prepared with ionomer as surfactant for anion exchange membrane fuel cells

Microstructured electrodeposited polypyrrole–phthalocyanine hybrid material, from morphology to ammonia sensing

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