Three Dimensionally Free-Formable Graphene Foam with Designed Structures for Energy and Environmental Applications

Xu, Xi; Guan, Cao; Xu, Le; Tan, Yong Zen; Zhang, Dan‐Wei; Wang, Yanqing; Zhang, Hong; Blackwood, Daniel John; Wang, John; Li, Meng; Ding, Jun

doi:10.1021/acsnano.9b08191

Cited by 116 publications

(76 citation statements)

References 49 publications

(85 reference statements)

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“…Various oxides have the ability to act as substrates for growing few-layer graphitic or graphene under CVD conditions, such as MgO, 81 ZnO, 82 CaO, [83][84][85] SiO 2 , [86][87][88][89][90] and so forth. The oxides can prompt the decomposition of the carbon source and the deposition of graphitic carbon on their surface.…”

Section: Cvd On Oxide Templates For 3dgmentioning

confidence: 99%

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Porous monoliths of 3D graphene for electric double‐layer supercapacitors

Zeng

Gao

et al. 2021

Carbon Energy

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For delivering the nanoscaled extraordinary characteristics in macroscopical bulk, it is essential to integrate two-dimensional nanosheets into threedimensional (3D) porous monoliths, alternatively called as 3D architectures, 3D networks, or aerogels. The intersupported structure of porous monolithic 3D graphene (3DG) can prevent aggregation or restacking of graphene individuals, and the interconnected sp 2 network of 3DG not only can provide the highway for the transport of electron/phonon but also can present continual cavities/channels for mass transfer. This review summarizes the synthesis methodology of 3DG porous monoliths and highlights the application for electric double-layer capacitors. Present challenges and future prospects about the manufacture and application of 3DG are also discussed.

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Section: Cvd On Oxide Templates For 3dgmentioning

confidence: 99%

“…89 Efforts have been made on fabricating graphene monoliths with a finer interconnected network. Xu et al 90 reported 3D free-formable graphene foams by combination of 3D printing and CVD (Figure 11H). Porous silica templates were prepared by digital light process method with photopolymerization of resin.…”

Section: Cvd On Oxide Templates For 3dgmentioning

confidence: 99%

Porous monoliths of 3D graphene for electric double‐layer supercapacitors

Zeng

Gao

et al. 2021

Carbon Energy

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“…Till now, various methods have been developed to prepare 3D graphene such as template-assisted methods, assembly of graphene oxide (GO), and laser-introduced methods. [8] Due to the difference in preparation methods, these 3D graphene have different structures at the macroscopic level such as powder, paper-like, and monolithic structures. [9] Compared with the powder and paper-like graphene, the monolithic graphene (such as graphene foam (GF) and graphene aerogel (GA)) have 3D structures at both micro-and macro-scale.…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Graphene‐Based Macrostructures for Electrocatalysis

Cui

Guo

Zhou

2021

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Electrochemical energy storage and conversion is an effective strategy to relieve the increasing energy and environment crisis. The sluggish reaction kinetics in the related devices is one of the major obstacles for them to realize practical applications. More efforts should be devoted to searching for high‐efficiency electrocatalysts and enhancing the electrocatalytic performance. 3D graphene macrostructures (3D GMs) are one kind of porous crystalline materials with 3D structures at both micro‐ and macro‐scale. The unique structure can achieve large accessible surface area, expose many active sites, promote fast mass/electron transport, and provide wide room for further functional modification. All these features make them promising candidates for electrocatalysis. In this review, the authors focus on the latest progress of 3D GMs for electrocatalysis. First, the preparation methods of 3D GMs are introduced followed by the strategies for functional modifications. Then, their electrocatalytic performances are discussed in detail including monofunctional and bifunctional electrocatalysis. The electrocatalytic processes involve oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, and carbon dioxide reduction reaction. Finally, the challenges and perspectives are presented to offer a guideline for the exploration of excellent 3D GM‐based electrocatalysts.

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“…Apart from thermal reduction and chemical reduction, CVD method is the other effective way in preparing carbon materials with few defects, rather than improving porous carbon to be more perfect. The carbon edge sites including functional groups and defects can be lowered to 4 at % [3d,6] . Among these three methods, thermal reduction and chemical reduction have more advantages when applied to mass production, while CVD is super in fine structure fabrication.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Spillover Facilitating Reduction of Surface Oxygen Species on Porous Carbon

et al. 2021

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Surface oxygen‐containing functional groups of porous carbon have great influence on its various properties, including the catalytic performance, chemical stability, and adsorption capacity. In this paper, a catalytic hydrogen spillover method was proposed to prepare porous carbons with low oxygen content in 7 vol % H2/Ar atmosphere. Pt/C was used as the catalyst. Petroleum coke‐based porous carbon was adopted as the model material to study hydrogen spillover reduction effect within the temperature range of 500–700 °C. XRD, Raman and XPS were used to characterize the microstructures and surface chemical composition of prepared materials. Compared with H2 reduction, hydrogen spillover reduction can further increase graphitic degree of porous carbon without destroying the morphology and pore structure, and can reduce the contents of surface oxygen‐containing groups of porous carbon more effectively. And among different kinds of oxygen‐containing groups, the more reactive hydrogen atoms dissociated by Pt/C catalyst have the best reduction effect on C−O species.

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Three Dimensionally Free-Formable Graphene Foam with Designed Structures for Energy and Environmental Applications

Cited by 116 publications

References 49 publications

Porous monoliths of 3D graphene for electric double‐layer supercapacitors

Porous monoliths of 3D graphene for electric double‐layer supercapacitors

Three‐Dimensional Graphene‐Based Macrostructures for Electrocatalysis

Hydrogen Spillover Facilitating Reduction of Surface Oxygen Species on Porous Carbon

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