Size effect of oxygen reduction reaction on nitrogen-doped graphene quantum dots

Zhang, Peng; Hu, Qiang; Yang, Xuejing; Hou, Xiuli; Mi, Jianli; Liu, Lei; Dong, Mingdong

doi:10.1039/c7ra10104j

Cited by 42 publications

(23 citation statements)

References 63 publications

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“…The Koutecky–Levich (K–L) plots of this catalyst showed that the ORR electron‐transfer number ( n ) was 3.82, comparable to that of commercial Pt/C: 3.96. Zhang et al 169 used density functional theory (DFT) to study the effect of the size of N‐GQD on catalytic ORR performance in terms of the adsorption strength of ORR intermediates, reaction free energy, rate‐determining step, and overpotential. The results indicated that the smallest N‐doped GQDs had the smallest overpotential and the highest ORR catalytic activity.…”

Section: Applications Of Cds In Electrocatalysismentioning

confidence: 99%

A review of carbon dots and their composite materials for electrochemical energy technologies

et al. 2021

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Carbon dots (CDs) and their composites as energy storage materials and electrocatalysts have emerged as new types of quasi‐zero‐dimensional carbon materials. CDs can provide a large specific surface area, numerous electron–electron hole pairs, adjustable heteroatom doping, rich surface functional groups, and so on. However, the roles and functional mechanisms of CDs and their composite materials in the enhancement of electrochemical performance remain unclear and need to be understood in depth. Based on the most recent literature, this paper comprehensively reviews the synthesis methods and applications of various categories of CDs and their composites as electrode materials of supercapacitors, lithium‐ion batteries, sodium‐ion batteries, and potassium‐ion batteries, and as electrocatalysts for hydrogen evolution, oxygen evolution, and oxygen reduction reactions in metal–air batteries, fuel cells, and water electrolysis. To facilitate further research and development, several important aspects related to CDs and their composite materials are summarized with analysis of the technical challenges in practical applications and discussion of the possible development perspectives.

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Section: Applications Of Cds In Electrocatalysismentioning

confidence: 99%

A review of carbon dots and their composite materials for electrochemical energy technologies

et al. 2021

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“…The functionalization procedures of CQD play a fundamental role not only in the PL modulation, but also in many other applications including ORR catalysis [26][27][28], selective oxidation of organic molecules [29], doping of semiconducting membranes [30], drug delivery [19,23], chemical or biosensing [4,31] etc. The functionalization can lead to bulk doping or to definite defect organizations, such as surface passivation by noncovalent bonds or by covalent linkages of different molecules in edge sites.…”

Section: Introductionmentioning

confidence: 99%

Tuneable properties of carbon quantum dots by different synthetic methods

et al. 2021

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Carbon quantum dots (CQD) were prepared from three different precursors and by three bottom-up synthesis methods: classical pyrolysis of citric acid (CAP), microwave irradiation of glucose (GM), and hydrothermal treatment of glucosamine hydrochloride (GAH). CQD were further functionalized using various nitrogen-containing compounds: 6-aminohexanoic acid, 1,6-diaminohexane, N-octylamine, dimethylamine, and tryptophan. Special attention was dedicated to investigate how the combination of synthetic method and starting material affected the nature and properties of CQD. The analysis indicated that CAP were good candidates for covalent post-functionalization, GM allowed an easy passivation, and GAH permitted the direct introduction of nitrogen into the core. The size distribution showed a core–shell structure for CQD functionalized with an aminoacid by microwave irradiation, whereas the thermal decomposition evidenced the degradation of functionalizing molecules and the presence of pyridinic and pyrrolic nitrogen after hydrothermal synthesis. Photoluminescence spectra revealed important differences between the synthesis techniques, related to the occurrence of surface states, and the highest fluorescence quantum yield for hydrothermally prepared CQD. These approaches led to CQD with properties that can be exploited in many fields from energy conversion to sensing.

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“…Moreover, it was shown that O 2 is stabilized significantly when water effects are modeled [10]. Different other aspects such as: the type of doping nitrogen (graphitic, pyridinic, pyrrolic) [7,11,12], concentration of N dopants [9,13,14], solvation effects of reaction intermediates [10,13,15], the size and shape of graphene sheets were investigated to get insights into activities of these materials [16,17]. Even though in recent years N doped graphitic materials (nanotubes, grapheme, etc.)…”

Section: Introductionmentioning

confidence: 99%

First principle studies of oxygen reduction reaction on N doped graphene: Impact of N concentration, position and co-adsorbate effect

Man

Tranca

Soriga

2020

Applied Surface Science

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Size effect of oxygen reduction reaction on nitrogen-doped graphene quantum dots

Abstract: The adsorption strength of ORR intermediates, the reaction free energy of rate-determining step, and the overpotential increase with the increase of the size of N-doped graphene quantum dots.

Cited by 42 publications

References 63 publications

A review of carbon dots and their composite materials for electrochemical energy technologies

A review of carbon dots and their composite materials for electrochemical energy technologies

Tuneable properties of carbon quantum dots by different synthetic methods

First principle studies of oxygen reduction reaction on N doped graphene: Impact of N concentration, position and co-adsorbate effect

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