Three‐Dimensional Nitrogen and Boron Co‐doped Graphene for High‐Performance All‐Solid‐State Supercapacitors

Wu, Zhong‐Shuai; Winter, Andreas; Чэн, Лонг; Sun, Yi; Turchanin, Andrey; Feng, Xinliang; Müllen, Kläus

doi:10.1002/adma.201201948

Cited by 1,322 publications

(833 citation statements)

References 49 publications

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“…3) 22 and the enhanced oxygen atom density in regions connecting graphene sheets, which is seen by energy-filtering transmission electron microscopy mapping ( Supplementary Fig. 4) 23 . Though there is no direct evidence, this possible bonding between graphene sheets is further suggested by the observation of a ductile cup and cone tensile fracture (Fig.…”

Section: Synthesismentioning

confidence: 99%

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

et al. 2015

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It is a challenge to fabricate graphene bulk materials with properties arising from the nature of individual graphene sheets, and which assemble into monolithic three-dimensional structures. Here we report the scalable self-assembly of randomly oriented graphene sheets into additive-free, essentially homogenous graphene sponge materials that provide a combination of both cork-like and rubber-like properties. These graphene sponges, with densities similar to air, display Poisson's ratios in all directions that are near-zero and largely strain-independent during reversible compression to giant strains. And at the same time, they function as enthalpic rubbers, which can recover up to 98% compression in air and 90% in liquids, and operate between À 196 and 900°C. Furthermore, these sponges provide reversible liquid absorption for hundreds of cycles and then discharge it within seconds, while still providing an effective near-zero Poisson's ratio.

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Section: Synthesismentioning

confidence: 99%

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

et al. 2015

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“…Nowadays, it is convenient to fabricate graphene through various methods such as exfoliation routes,5 chemical vapor deposition (CVD),6 carbon segregation,7 and epitaxial growth 8. Moreover, the modulation of electronic properties of graphene via doping9 or decoration10 has been demonstrated in many works. Consequently, a rising question is whether there are other types of pure element 2D materials waiting for exploration 11.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Single‐Crystalline Boron Nanosheets for Enhanced Electro‐Optical Performances

et al. 2015

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Large‐scale single‐crystalline ultrathin boron nanosheets (UBNSs, ≈10 nm) are fabricated through an effective vapor–solid process via thermal decomposition of diborane. The UBNSs have obvious advantages over thicker boron nanomaterials in many aspects. Specifically, the UBNSs demonstrate excellent field emission performances with a low turn‐on field, E to, of 3.60 V μm−1 and a good stability. Further, the dependence of (turn‐on field) E to/(threshold field) E thr and effective work function, Φ e, on temperature is investigated and the possible mechanism of temperature‐dependent field emission phenomenon has been discussed. Moreover, electronic transport in a single UBNS reveals it to be an intrinsic p‐type semiconductor behavior with carrier mobility about 1.26 × 10−1 cm2 V−1 s−1, which is the best data in reported works. Interestingly, a multiconductive mechanism coexisting phenomenon has been explored based on the study of temperature‐dependent conductivity behavior of the UBNSs. Besides, the photodetector device fabricated from single‐crystalline UBNS demonstrates good sensitivity, reliable stability, and fast response, obviously superior to other reported boron nanomaterials. Such superior electronic‐optical performances are originated from the high quality of single crystal and large specific surface area of the UBNSs, suggesting the potential applications of the UBNSs in field‐emitters, interconnects, integrated circuits, and optoelectronic devices.

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“…Few promising directions have been explored to address this issue, especially using graphene oxide (GO) nanosheets. For example, several researchers have demonstrated hydrothermal treatment of GO suspension as a versatile method to produce various types of porous graphene frameworks [23][24][25][26] . Vermant and colleagues 27 reported the preparation of GO frameworks from bi-continuous emulsions stabilized by the nanosheets.…”

mentioning

confidence: 99%

Diffusion driven layer-by-layer assembly of graphene oxide nanosheets into porous three-dimensional macrostructures

2014

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Despite recent progress in preparing numerous types of nanosheets, it remains a difficult challenge to assemble the tiny building blocks into functional macroscale architectures suitable for practical applications. Here we introduce a diffusion driven layer-by-layer assembly process and demonstrate its application for the construction of graphene oxide sheets into various three-dimensional structures. This process involves complexation of the negatively charged graphene oxide sheets and positively charged branched polyethylenimine at a given interface. We find that the diffusion of branched polyethylenimine molecules allows the complex to continuously grow into foam-like frameworks with tunable porosities. Furthermore, the assembly process is quite robust and can be utilized in various configurations such as to create free-standing architectures with tailored shapes or patterned films on a substrate. With such useful features, we believe that this technique may serve as a valuable tool for the assembly of nanomaterials.

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Three‐Dimensional Nitrogen and Boron Co‐doped Graphene for High‐Performance All‐Solid‐State Supercapacitors

Cited by 1,322 publications

References 49 publications

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

Ultrathin Single‐Crystalline Boron Nanosheets for Enhanced Electro‐Optical Performances

Diffusion driven layer-by-layer assembly of graphene oxide nanosheets into porous three-dimensional macrostructures

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