Functional Nanoporous Graphene Foams with Controlled Pore Sizes

Huang, Xiaodan; Qian, Kun; Yang, Jie; Zhang, Jun; Li, Li; Yu, Chengzhong; Zhao, Dongyuan

doi:10.1002/adma.201201680

Cited by 357 publications

(265 citation statements)

References 39 publications

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“…Firstly, the graphene (GR) or graphene oxide (GO) is the matrix, and a limited amount of PVA usually less than 10 wt.% were added to improve the stacking of carbon planes [14][15][16][17]. For example, Chen et al [18] added 10 wt.% PVA to form a stable network in which PVA chains align along the GO plane to prevent the restacking of GO nanosheets in the drying process and thus equipped with high capacity and excellent rate performance as anode materials for Li-ion batteries after reduction.…”

Section: Introductionmentioning

confidence: 99%

Structure, Mechanical and Electrochemical Properties of Thermally Reduced Graphene Oxide-poly (Vinyl Alcohol) Foams

Wang

Chen

et al. 2017

Period. Polytech. Chem. Eng.

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Section: Introductionmentioning

confidence: 99%

Structure, Mechanical and Electrochemical Properties of Thermally Reduced Graphene Oxide-poly (Vinyl Alcohol) Foams

Wang

Chen

et al. 2017

Period. Polytech. Chem. Eng.

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“…Moreover, the nanosheets could easily aggregate or restack in the circumstance where no cross-linkers are used. [15][16][17] The third type of GFs are derived from organic carbon through high-temperature graphitization, e.g., by assembling and graphitizing oleic acid at 1000 °C with the assistance of Fe 3 O 4 nanocrystal template, [11] or by the graphitization of sugar at 1350 °C with the cost-effective sugar-blowing approach (Figure 1e,f). [12] These GFs have high crystallinity, great electrical conductivity, enlarged surface area, and outstanding mechanical strength and elasticity.…”

Section: Introductionmentioning

confidence: 99%

Vertically Aligned Graphene Nanosheet Arrays: Synthesis, Properties and Applications in Electrochemical Energy Conversion and Storage

Zhang

Lee

Zhang

2017

Advanced Energy Materials

139

103

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In the pursuit of better electrode kinetics and mass transportation for electrochemical energy applications, 3D graphene‐based electrodes have been receiving increasing research interest. Distinguished from other kinds of 3D graphene structures, the well‐developed, vertically aligned graphene nanosheet arrays (VAGNAs) could be grown on a variety of substrates by plasma‐enhanced chemical vapor deposition (PECVD), forming a 3D interconnected structure with intimate contact with substrates and largely exposed edges, and easily accessible open surfaces of the graphene nanosheets. Ascribing to the combined superior inherent properties of graphene and the special structure configuration, e.g., large surface area, excellent electron transfer capability, outstanding mechanical strength, great chemical and thermal stabilities, and enhanced electrochemical activity, VAGNAs have demonstrated promising applications in supercapacitors, batteries, and fuel cell catalysts. This progress report provides a brief review on the nucleation and growth of VAGNAs, their growth mechanism and properties, and highlights the recent important progress in their electrochemical energy conversion and storage applications, in the views of their pros and cons in comparison with other 3D graphene‐based structures. Challenges and perspectives for future advance are discussed in the end.

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“…2,10,[15][16][17] In most cases, such structures are synthesized by a top-down approach of graphite oxidation followed by chemical or thermal reduction. Thus, the achievable conductivity and porosity in the nal graphene based networks is directly related to the strengths of the oxidation of the starting graphite (to yield graphene-oxide, GO), and the reduction…”

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confidence: 99%

Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

Gadipelli

Skipper

et al. 2017

J. Mater. Chem. A

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We demonstrate a simple and fully scalable method for obtaining hierarchical hyperporous graphene networks of ultrahigh total pore volume by thermal-shock exfoliation of graphene-oxide (exfGO) at a relatively mild temperature of 300 C. Such pore volume per unit mass has not previously been achieved in any type of porous solid. We find that the amount of oxidation of starting graphene-oxide is the key factor that determines the pore volume and surface area of the final material after thermal shock. Specifically, we emphasize that the development of the hyperporosity is directly proportional to the enhanced oxidation of sp 2 C]C to form C]O/COO. Using our method, we reproducibly synthesized remarkable meso-/macroporous graphene networks with exceptionally high total pore volumes, exceeding 6 cm 3 g À1. This is a step change compared to #3 cm 3 g À1 in conventional GO under similar synthetic conditions.Moreover, a record high amine impregnation of >6 g g À1 is readily attained in exfGO samples (solid-amine@exfGO), where amine loading is directly controlled by the pore-structure and volume of the host materials. Such solid-amine@exfGO samples exhibit an ultrahigh selective flue-gas CO 2 capture of 30-40 wt% at 75 C with a working capacity of z25 wt% and a very long cycling stability under simulated flue-gas stream conditions. To the best of our knowledge, this is the first report where a graphene-oxide based hyperporous carbon network is used to host amines for carbon capture application with exceptionally high storage capacity and stability.The widespread implementation of clean energy technologies, such as CCS (carbon capture and sequestration), fuel cells, batteries, supercapacitors, water electrolysers, and/or molecular storage and transport, is critical to tackle climate change and energy security issues. [1][2][3][4][5] In this regard, nanoporous carbons, metal-organic frameworks (MOFs), polymers and zeolites have gained tremendous attention as storage, transport and conversion media.2-7 Considerable performance improvements have been achieved by synthesizing and manipulating their functional features and porous structures.6 In the case of CO 2 capture, obtaining high enough CO 2 uptake capacities by using sorbent based materials under ue-gas conditions is still a challenging task. Many sorbent materials show good CO 2 uptake capacities but only at 0 C or 25 C and for 100% dry CO 2 .Porous sorbents including zeolites, activated carbons and MOFs do not show desirable selective CO 2 uptake under humid conditions and/or at >50 C. 8 This is a major setback for the implementation of CCS. The recent efforts on the introduction of CO 2 -philic amine groups into nanoporous structures have led to a large enhancement in selective carbon (CO 2 ) capture and effluent ue-gas tolerance. 4,7,8 However, the practical feasibility of these materials for CO 2 capture is compromised by the lack of a simple and large-scale synthesis method. Substantial improvements in both the structural stability and scalable synthesis of these...

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Functional Nanoporous Graphene Foams with Controlled Pore Sizes

Cited by 357 publications

References 39 publications

Structure, Mechanical and Electrochemical Properties of Thermally Reduced Graphene Oxide-poly (Vinyl Alcohol) Foams

Structure, Mechanical and Electrochemical Properties of Thermally Reduced Graphene Oxide-poly (Vinyl Alcohol) Foams

Vertically Aligned Graphene Nanosheet Arrays: Synthesis, Properties and Applications in Electrochemical Energy Conversion and Storage

Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

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