Structural evolution of turbostratic carbon: Implications in H2 storage

Ruz, Priyanka; Banerjee, S.; Pandey, M.; Sudarsan, V.; Sastry, P. U.; Kshirsagar, R.J.

doi:10.1016/j.solidstatesciences.2016.10.017

Cited by 53 publications

(22 citation statements)

References 46 publications

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“…The structure and morphology of HCC were investigated by using XRD, Raman spectroscopy, high‐resolution (HR) TEM, and SAED (Figure b–e). The results indicate that HCC possesses a turbostratic structure, which is a typical feature of a HC that has a graphite‐like layered structure, but no stacking between the bent layers . Moreover, a large number of nanovoids (i.e., pores) within the carbon were observed with increasing heat treatment temperature, which was ascribed to a decreasing defect concentration, heteroatom doping, and the rearrangement of carbon atoms, leading to a higher concentration of Na adsorption sites.…”

Section: Biomass‐derived Carbon For Sibsmentioning

confidence: 99%

“…The results indicate that HCC possesses at urbostratic structure, which is at ypical feature of aH Ct hat has ag raphite-like layered structure, but no stacking between the bent layers. [74] Moreover,alarge number of nanovoids (i.e.,p ores) within the carbon were observed with increasing heatt reatment temperature, whichw as ascribed to ad ecreasing defectc oncentration,h eteroatom doping, and the rearrangement of carbon atoms, leading to a higher concentration of Na adsorption sites. Furthermore, HCC-derived carbon, carbonized at 1300 8C, exhibited as pecific capacityo f2 75 mAh g À1 and excellent cyclic stability with ac apacity retention of 97 %a fter 1000 cycles.…”

Section: Three-dimensional Carbonsmentioning

confidence: 99%

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Biomass‐Derived Carbons for Sodium‐Ion Batteries and Sodium‐Ion Capacitors

et al. 2020

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In the past decade, the rapid development of portable electronic devices, electric vehicles, and electrical devices has stimulated extensive interest in fundamental research and the commercialization of electrochemical energy‐storage systems. Biomass‐derived carbon has garnered significant research attention as an efficient, inexpensive, and eco‐friendly active material for energy‐storage systems. Therefore, high‐performance carbonaceous materials, derived from renewable sources, have been utilized as electrode materials in sodium‐ion batteries and sodium‐ion capacitors. Herein, the charge‐storage mechanism and utilization of biomass‐derived carbon for sodium storage in batteries and capacitors are summarized. In particular, the structure–performance relationship of biomass‐derived carbon for sodium storage in the form of batteries and capacitors is discussed. Despite the fact that further research is required to optimize the process and application of biomass‐derived carbon in energy‐storage devices, the current review demonstrates the potential of carbonaceous materials for next‐generation sodium‐related energy‐storage applications.

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Section: Biomass‐derived Carbon For Sibsmentioning

confidence: 99%

Section: Three-dimensional Carbonsmentioning

confidence: 99%

Biomass‐Derived Carbons for Sodium‐Ion Batteries and Sodium‐Ion Capacitors

et al. 2020

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“…At large q-values, the intensity followed a Porod’s law decay with I(q) ~q −α . Fitting the SAXS profiles, a non-integer value for α was obtained, α = −3.4 , which indicated that the active material of the electrode is a porous system having a fractal nature of its structural morphology 55 . From a qualitative point of view, since scattering intensity are similar, NC_ J and NC_CV have a comparable specific surface area, smaller than the pristine reference p-Si sample.…”

Section: Resultsmentioning

confidence: 99%

High-performance solid state supercapacitors assembling graphene interconnected networks in porous silicon electrode by electrochemical methods using 2,6-dihydroxynaphthalen

Romanițan

Varasteanu

Mihalache

et al. 2018

Sci Rep

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The challenge for conformal modification of the ultra-high internal surface of nanoporous silicon was tackled by electrochemical polymerisation of 2,6-dihydroxynaphthalene using cyclic voltammetry or potentiometry and, notably, after the thermal treatment (800 °C, N2, 4 h) an assembly of interconnected networks of graphene strongly adhering to nanoporous silicon matrix resulted. Herein we demonstrate the achievement of an easy scalable technology for solid state supercapacitors on silicon, with excellent electrochemical properties. Accordingly, our symmetric supercapacitors (SSC) showed remarkable performance characteristics, comparable to many of the best high-power and/or high-energy carbon-based supercapacitors, their figures of merit matching under battery-like supercapacitor behaviour. Furthermore, the devices displayed high specific capacity values along with enhanced capacity retention even at ultra-high rates for voltage sweep, 5 V/s, or discharge current density, 100 A/g, respectively. The cycling stability tests performed at relatively high discharge current density of 10 A/g indicated good capacity retention, with a superior performance demonstrated for the electrodes obtained under cyclic voltammetry approach, which may be ascribed on the one hand to a better coverage of the porous silicon substrate and, on the other hand, to an improved resilience of the hybrid electrode to pore clogging.

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“…The unusual increase in conversion observed for Pd5 during recycling may be attributed to a structural change in the catalyst. It is reasonable to assume that under the reaction conditions the hexagonal network of GO was transformed into turbostratic carbon with a rather irregular structure in which the layers are folded or crumpled and there is no stacking between them . The formation of a less ordered structure of the support material may provide enhanced access for the reactants to the active Pd species and thereby tends to contribute to improved catalytic performance.…”

Section: Resultsmentioning

confidence: 99%

Immobilization of a Pd(II) complex on hydrophilic graphite oxide and its catalytic investigation in the Heck coupling reaction

Mastalir

Hancsárik

Szabó

2020

Applied Organom Chemis

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Tetraamminepalladium(II) chloride monohydrate was heterogenized on hydrophilic graphite oxide (GO), synthesized by Brodie's method. Two samples, with Pd contents of 2% and 5%, referred to as Pd2 and Pd5, respectively, were prepared by a simple and scalable impregnation method and tested as catalysts in the Heck coupling reaction of styrene and bromobenzene. The reactions were carried out at 423 K for 3 hr by applying Na2CO3 as a base and N‐methylpirrolidone or dimethylformamide (DMF) as a solvent. The Pd complexes heterogenized on graphene oxide platelets proved to be highly active and selective catalysts, and Pd2 was more efficient than Pd5. The effect of quaternary ammonium salts (tetrabutylammonium bromide and tetrabutylammonium chloride, TBAC) as modifiers and that of an ionic liquid (1‐butyl‐3‐methylimidazolium bromide, bmim) was studied and the highest conversions were obtained when TBAC was employed. The selectivity for the formation of the main product, E‐stilbene, was in the range 91–96%. Catalyst recycling was investigated and the extent of leaching was found to depend on the solvent. DMF proved to be a highly feasible reaction medium because both catalysts could be recycled five times in this solvent without any significant loss of activity. A hot filtration test was performed and gave evidence that leaching of the active Pd species did not take place under the above reaction conditions. These results substantiate the fact that simple cationic Pd species can be efficiently immobilized on pristine GO surfaces without the requirement of the functionalization of GO with nitrogen‐containing mono or multidentate ligands as binding sites.

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Structural evolution of turbostratic carbon: Implications in H2 storage

Cited by 53 publications

References 46 publications

Biomass‐Derived Carbons for Sodium‐Ion Batteries and Sodium‐Ion Capacitors

Biomass‐Derived Carbons for Sodium‐Ion Batteries and Sodium‐Ion Capacitors

High-performance solid state supercapacitors assembling graphene interconnected networks in porous silicon electrode by electrochemical methods using 2,6-dihydroxynaphthalen

Immobilization of a Pd(II) complex on hydrophilic graphite oxide and its catalytic investigation in the Heck coupling reaction

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