The edge- and basal-plane-specific electrochemistry of a single-layer graphene sheet

Yuan, Wenjing; Yu, Zhishui; Li, Yingru; Li, Chun; Peng, Hailin; Zhang, Jin; Liu, Zhongfan; Dai, Liming; Shi, Gaoquan

doi:10.1038/srep02248

Cited by 453 publications

(340 citation statements)

References 45 publications

(55 reference statements)

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“…8a). [229] Graphene edges (with current density j = 0.11 A cm -2 ) exhibit larger electrocatalytic properties, while the basal plane (j = 2.2×10 -4 A cm -2 ) is relatively inert (Fig. 8b).…”

Section: Graphene-based Electrochemical (Gec) Biosensorsmentioning

confidence: 99%

Sensing at the Surface of Graphene Field‐Effect Transistors

et al. 2016

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Abstract. 10Recent research trends now offer new opportunities for developing the next generations of label-free biochemical sensors using graphene and other two-dimensional materials. While the physics of graphene transistors operated in electrolyte is well grounded, important chemical challenges still remain to be addressed, namely the impact of the chemical functionalizations of graphene on the key electrical parameters and the sensing performances. In fact, graphene -at least ideal graphene -is highly chemically inert. The 15 functionalizations and chemical alterations of the graphene surface -both covalently and non-covalently -are crucial steps that define the sensitivity of graphene. The presence, reactivity, adsorption of gas and ions, proteins, DNA, cells and tissues on graphene have been successfully monitored with graphene. This review aims to unify most of the work done so far on biochemical sensing at the surface of a (chemically functionalized) graphene field-effect transistor and the challenges that lie ahead. We are convinced that graphene biochemical sensors 20 hold great promises to meet the ever-increasing demand for sensitivity, especially looking at the recent progresses suggesting that the obstacle of Debye screening can be overcome.2

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Section: Graphene-based Electrochemical (Gec) Biosensorsmentioning

confidence: 99%

Sensing at the Surface of Graphene Field‐Effect Transistors

et al. 2016

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“…[12][13][14] However, for catalytic applications, it has been shown that graphene is highly active at its edges compared to its basal plane. 15,16 The increased density of states at the edge defects compared to basal plane makes the edges of graphene have faster capabilities of electron transfer to oxidize or reduce various chemical compounds in the solution phase. This faster electron transfer ultimately leads to higher current density along with a shift in peak potential.…”

Section: Introductionmentioning

confidence: 99%

Superaerophobic graphene nano-hills for direct hydrazine fuel cells

et al. 2017

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Hydrazine fuel-cell technology holds great promise for clean energy, not only because of the greater energy density of hydrazine compared to hydrogen but also due to its safer handling owing to its liquid state. However, current technologies involve the use of precious metals (such as platinum) for hydrazine oxidation, which hinders the further application of hydrazine fuel-cell technologies. In addition, little attention has been devoted to the management of gas, which tends to become stuck on the surface of the electrode, producing overall poor electrode efficiencies. In this study, we utilized a nano-hill morphology of vertical graphene, which efficiently resolves the issue of the accumulation of gas bubbles on the electrode surface by providing a nano-rough-edged surface that acts as a superaerophobic electrode. The growth of the vertical graphene nano-hills was achieved and optimized by a scalable plasma-enhanced chemical vapor deposition method. The resulting metal-free graphene-based electrode showed the lowest onset potential (−0.42 V vs saturated calomel electrode) and the highest current density of all the carbon-based materials reported previously for hydrazine oxidation.

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“…It was demonstrated that graphene edges showed a two-time higher ORR reactivity, a 4 orders of magnitude larger specific capacitance, and a faster electron-transfer rate than basal planes (Fig. 2g, h) [124,125]. The observed edge enhanced electrocatalytic activity was further confirmed by precise measurements of ORR activity at the edge or basal-plane regions of HOPG using a micro-apparatus (Fig.…”

Section: Defect-induced Charge Transfermentioning

confidence: 60%

Carbon-Based Metal-Free Electrocatalysis for Energy Conversion, Energy Storage, and Environmental Protection

Xiao

Zou

et al. 2018

Electrochem. Energ. Rev.

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157

103

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Carbon-based metal-free catalysts possess desirable properties such as high earth abundance, low cost, high electrical conductivity, structural tunability, good selectivity, strong stability in acidic/alkaline conditions, and environmental friendliness. Because of these properties, these catalysts have recently received increasing attention in energy and environmental applications. Subsequently, various carbon-based electrocatalysts have been developed to replace noble metal catalysts for low-cost renewable generation and storage of clean energy and environmental protection through metal-free electrocatalysis. This article provides an up-to-date review of this rapidly developing field by critically assessing recent advances in the mechanistic understanding, structure design, and material/device fabrication of metal-free carbon-based electrocatalysts for clean energy conversion/storage and environmental protection, along with discussions on current challenges and perspectives. Graphical AbstractKeywords Metal-free electrocatalysis · Carbon-based catalysts · Energy conversion and storage · Environmental protection

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The edge- and basal-plane-specific electrochemistry of a single-layer graphene sheet

Cited by 453 publications

References 45 publications

Sensing at the Surface of Graphene Field‐Effect Transistors

Sensing at the Surface of Graphene Field‐Effect Transistors

Superaerophobic graphene nano-hills for direct hydrazine fuel cells

Carbon-Based Metal-Free Electrocatalysis for Energy Conversion, Energy Storage, and Environmental Protection

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