Synthesis and characterization of activated 3D graphene via catalytic growth and chemical activation for electrochemical energy storage in supercapacitors

Liu, Bolin; Li, Ze-Sheng; Pang, Qi; Zhuang, Qintao; Zhu, Jingyi; Tsiakaras, Panagiotis; Shen, Pei Kang

doi:10.1016/j.electacta.2019.134878

Cited by 35 publications

(14 citation statements)

References 77 publications

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of the AG/rGO/P-Cu mesh was almost 0 Ω, whereas those of the R- and B-Cu meshes with AG/rGO were 0.81 and 0.67 Ω, respectively. This result indicates that the P-Cu mesh with a porous surface provided improved contacts between the electrode materials and current collector surface, which led to efficient charge transfer with rapid and excellent EDL formation on the AG/rGO surfaces [ 38 , 39 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Activated Graphene Deposited on Porous Cu Mesh for Supercapacitors

2021

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A porous Cu (P-Cu) mesh was used as a current collector and its morphological effect on the supercapacitor performance was investigated. A porous surface was obtained by thermally annealing the Cu mesh using ammonia gas. Hierarchically porous activated graphene (AG) with a high specific surface area (SSA) was deposited on the P-Cu mesh using electrophoretic deposition, aided by graphene oxide (GO). GO was thermally converted to electrically conductive reduced graphene oxide (rGO). The AG/rGO that was deposited on the P-Cu mesh achieved a high specific capacitance of up to 140.0 F/g and a high energy density of up to 3.11 Wh/kg at a current density of 2 A/g in 6 m KOH aqueous electrolyte. The high SSA of AG and the porous surface morphology of the Cu mesh allowed efficient electric double-layer formation and charge transport. This work offers an alternative to improve supercapacitors by combining a porous metallic current collector with porous AG.

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Section: Resultsmentioning

confidence: 99%

Activated Graphene Deposited on Porous Cu Mesh for Supercapacitors

2021

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“…The Fermi level of graphene lies at the convergence point of CB and VB, make graphene as zero band gap material. Lately, the concept of 3D graphene based hybrid heterostructure is continuation of the 2D heterostructure materials, in the sense that 2D materials are hybridized by interplanar vdW or electrostatic interactions, while 3D structure is prepared by twisting, pore‐creating or stacking (Figure 15(d, e)) [178] . By designing of 3D graphene framework with sp2 hybridization, the exceptional inherent properties of 2D graphene could connate to 3D architecture [179,64] …”

Section: Magnifying Mechanism Of Charge Separation Related To Stability Of Ldh@graphene and Analogous Heterostructure Towards Pc/pec Watementioning

confidence: 99%

Section: Magnifying Mechanism Of Charge Separation Related To Stability Of Ldh@graphene and Analogous Heterostructure Towards Pc/pec Watementioning

confidence: 99%

Recent Progress in LDH@Graphene and Analogous Heterostructures for Highly Active and Stable Photocatalytic and Photoelectrochemical Water Splitting

Nayak

2021

Chemistry An Asian Journal

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Photocatalytic (PC) and photoelectrochemical (PEC) water splitting is a plethora of green technological process, which transforms copiously available photon energy into valuable chemical energy. With the augmentation of modern civilization, developmental process of novel semiconductor photocatalysts proceeded at a sweltering rate, but the overall energy conversion efficiency of semiconductor photocatalysts in PC/PEC is moderately poor owing to the instability ariseing from the photocorrosion and messy charge configuration. Particularly, layered double hydroxides (LDHs) as reassuring multifunctional photocatalysts, turned out to be intensively investigated owing to the lamellar structure and exceptional physico‐chemical properties. However, major drawbacks of LDHs material are its low conductivity, sluggish mass transfer and structural instability in acidic media, which hinder their applicability and stability. To surmount these obstacles, the formation of LDH@graphene and analogus heterostructures could proficiently amalgamate multi‐functionalities, compensate distinct shortcomings, and endow novel properties, which ensure effective charge separation to result in stability and superior catalytic activities. Herein, we aim to summarize the currently updated synthetic strategies used to design heterostructures of 2D LDHs with 2D/3D graphene and graphene analogus material as graphitic carbon nitride (g‐C3N4), and MoS2 as mediator, or interlayer support, or co‐catalyst or vice versa for superior PC/PEC water splitting activities along with long‐term stabilities. Furthermore, latest characterization technique measuring the stability along with variant interface mode for imparting charge separation in LDH@graphene and graphene analogus heterostructure has been identified in this field of research with understanding the intrinsic structural features and activities.

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“…Figure 4 illustrates the described process. Chemical heat storage offers several advantages over the other two TCHS processes [90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107]:…”

Section: Chemical Reactions Storage Processmentioning

confidence: 99%

Recent Status and Prospects on Thermochemical Heat Storage Processes and Applications

Gbenou

Fopah-Lele

Wang

2021

Entropy

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Recent contributions to thermochemical heat storage (TCHS) technology have been reviewed and have revealed that there are four main branches whose mastery could significantly contribute to the field. These are the control of the processes to store or release heat, a perfect understanding and designing of the materials used for each storage process, the good sizing of the reactor, and the mastery of the whole system connected to design an efficient system. The above-mentioned fields constitute a very complex area of investigation, and most of the works focus on one of the branches to deepen their research. For this purpose, significant contributions have been and continue to be made. However, the technology is still not mature, and, up to now, no definitive, efficient, autonomous, practical, and commercial TCHS device is available. This paper highlights several issues that impede the maturity of the technology. These are the limited number of research works dedicated to the topic, the simulation results that are too illusory and impossible to implement in real prototypes, the incomplete analysis of the proposed works (simulation works without experimentation or experimentations without prior simulation study), and the endless problem of heat and mass transfer limitation. This paper provides insights and recommendations to better analyze and solve the problems that still challenge the technology.

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Synthesis and characterization of activated 3D graphene via catalytic growth and chemical activation for electrochemical energy storage in supercapacitors

Cited by 35 publications

References 77 publications

Activated Graphene Deposited on Porous Cu Mesh for Supercapacitors

Activated Graphene Deposited on Porous Cu Mesh for Supercapacitors

Recent Progress in LDH@Graphene and Analogous Heterostructures for Highly Active and Stable Photocatalytic and Photoelectrochemical Water Splitting

Recent Status and Prospects on Thermochemical Heat Storage Processes and Applications

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