Nitrogen-doped carbon dots decorated on graphene: a novel all-carbon hybrid electrocatalyst for enhanced oxygen reduction reaction

Hu, Chao; Yu, Chang; Li, Mingyu; Wang, Xiuna; Dong, Qiang; Wang, Gang

doi:10.1039/c4cc08735f

Cited by 163 publications

(70 citation statements)

References 24 publications

(2 reference statements)

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“…Recently, non‐metal carbon‐based electrocatalysts have attracted great attention because of their excellent stability, low cost, and good methanol tolerance compared with Pt‐based catalysts . In particular, N‐doped CQDs have been widely used in the oxygen reduction reaction (ORR) as the catalyst or cocatalyst . The electrocatalytic activity of the prepared CQDs was evaluated by cyclic voltammetry (CV) by using a conventional three‐electrode system and linear sweep voltammetry (LSV) using a rotating disk electrode (RDE).…”

Section: Resultsmentioning

confidence: 99%

“…[2,57] In particular, N-doped CQDs have been widely used in the oxygen reduction reaction (ORR) as the catalysto r cocatalyst. [58] The electrocatalytic activity of the prepared CQDs was evaluated by cyclic voltammetry (CV) by using ac onventional three-electrode system andl inear sweep voltammetry (LSV) using ar otating disk electrode (RDE). As shown in Figure 7a,t he CQDs have ar eduction peak near À0.42 V. Moreover,i tc an be seen from Figure S10 (in the SupportingI nformation) that the dissolvedO 2 catalyzed by CQDs is asecondary reduction reaction, and the electron transfer number (n)o ft he CQDs is 1.33-1.38, indicating that the ORR activities of individual CQDsare relatively poor.T oimprove its catalysis properties, we chose to combine CQDs with graphene oxide (GO), called GO-CQDs.…”

Section: Resultsmentioning

confidence: 99%

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Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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Sustainable, inexpensive, and environmentally friendly biomass waste can be exploited for large‐scale production of carbon nanomaterials. Here, alkali lignin was employed as a precursor to synthesize carbon quantum dots (CQDs) with bright green fluorescence through a simple one‐pot route. The prepared CQDs had a size of 1.5–3.5 nm, were water‐dispersible, and showed wonderful biocompatibility, in addition to their excellent photoluminescence and electrocatalysis properties. These high‐quality CQDs could be used in a wide range of applications such as metal‐ion detection, cell imaging, and electrocatalysis. The wide range of biomass lignin feedstocks provide a green, low‐cost, and viable strategy for producing high‐quality fluorescent CQDs and enable the conversion of biomass waste into high‐value products that promote sustainable development of the economy and human society.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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“…3–5 In fact, carbon dots have emerged to represent now a rapidly advancing and expanding research field, as reflected by the large number of recent publications in the literature, with extensive investigations looking into many aspects of carbon dots for both fundamental and technological purposes. 3–16 …”

Section: Introductionmentioning

confidence: 99%

Enhanced fluorescence properties of carbon dots in polymer films

et al. 2016

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Carbon dots of small carbon nanoparticles surface-functionalized with 2,2′-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA-carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were attributed to the different levels and/or effectiveness of the surface functionalization-passivation in the carbon dots. These fractions, as well as carbon nanoparticles without any deliberate surface functionalization, were dispersed into poly(vinyl alcohol) (PVA) for composite films. In the PVA film matrix, the carbon dots and nanoparticles exhibited much enhanced fluorescence emissions in comparison with their corresponding aqueous solutions. The increased fluorescence quantum yields in the films were determined quantitatively by using a specifically designed and constructed film sample holder in the emission spectrometer. The observed fluorescence decays of the EDA-carbon dots in film and in solution were essentially the same, suggesting that the significant enhancement in fluorescence quantum yields from solution to film is static in nature. Mechanistic implications of the results, including a rationalization in terms of the compression effect on the surface passivation layer (similar to a soft corona) in carbon dots when embedded in the more restrictive film environment resulting in more favorable radiative recombinations of the carbon particle surface-trapped electrons and holes, and also potential technological applications of the brightly fluorescent composite films are highlighted and discussed.

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“…Carbon quantum dots (CQDs), nano-sized carbon particles, have attracted growing interest due to their high photochemical stability, low toxicity, good biocompatibility, and low environmental impact [18,19]. It has also been demonstrated that CQDs are of great potential in energy storage and conversions [20][21][22]. It is well known that there are abundant negative charged oxygen-containing functional groups on the surface of CQDs.…”

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confidence: 99%

CoS nanosheets-coupled graphene quantum dots architectures as a binder-free counter electrode for high-performance DSSCs

Liu

Chen

et al. 2016

Sci. China Mater.

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als as candidates are considered and developed to replace Pt CE, such as sulphide [6,7], nitride [8], polymer [9], carbon materials [5,10,11], and hybrid materials [12].Low-cost abundant cobalt sulphide (CoS) is one of the potential and promising electrocatalysts which has been widely utilized in various energy storage/conversion devices such as Li-ion battery, supercapacitor [13][14][15] Kung et al. [17] carried out a two-step approach of chemical bath deposition (CBD) and sulfuration treatment to fabricate acicular CoS nanorod arrays. This new morphology and structure endowed the DSSCs based on CoS CE with a good efficiency. It is easily observed that the size and morphology of CoS have an important influence on electrochemical performance for I 3 − reduction, and carbon species have unique features and superiorities in increasing the conductivity of CoS CE materials, thus further improving its catalytic activities for I 3 − reduction. Carbon quantum dots (CQDs), nano-sized carbon particles, have attracted growing interest due to their high photochemical stability, low toxicity, good biocompatibility, and low environmental impact [18,19]. It has also been demonstrated that CQDs are of great potential in energy storage and conversions [20][21][22]. It is well known that there are abundant negative charged oxygen-containing functional groups on the surface of CQDs. These groups could further adsorb metal ions with positive charge easily to A BSTRACT Hybrid materials with alternate components and synergetic effects are promising and intriguing materials as electrodes for high-performance energy storage/conversion devices. Cobalt sulphide (CoS) is one of the low-cost but inactive catalysts as counter electrode (CE) for dye-sensitized solar cells (DSSCs). How to optimize its structure and further enhance its electrochemical activity for I3 − reduction remains a major challenge. Herein, a simple and efficient approach has been adopted to configure CoS sheets-coupled graphene quantum dots (GQDs) architectures via electrodepositing GQDs and CoS on the fl uorine doped tin oxide glass substrate. When employed as the binder-free CE for DSSCs, the as-made CoS-GQDs exhibits a high catalytic activity towards the reduction of I3 − , evidenced by the results of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements. A conversion efficiency of 7.30% is achieved, being superior to CoS CE (5.55%) and Pt CE (6.94%) due to their synergetic effects. The present work provides a simple method for configuring low-cost binder-free CE materials for replacing Pt.

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Nitrogen-doped carbon dots decorated on graphene: a novel all-carbon hybrid electrocatalyst for enhanced oxygen reduction reaction

Cited by 163 publications

References 24 publications

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Enhanced fluorescence properties of carbon dots in polymer films

CoS nanosheets-coupled graphene quantum dots architectures as a binder-free counter electrode for high-performance DSSCs

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