Facile synthesis of defect-rich nitrogen and sulfur Co-doped graphene quantum dots as metal-free electrocatalyst for the oxygen reduction reaction

Fan, Tianju; Zhang, Guangxing; Jian, Lingfeng; Murtaza, Imran; Meng, Hong; Liu, Yidong; Min, Yong

doi:10.1016/j.jallcom.2019.04.097

Cited by 79 publications

(40 citation statements)

References 37 publications

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“… 4 , 7 , 8 Specifically, dual-doped CDs always show a higher ORR catalytic activity than non-doped or single-doped CDs due to higher heteroatom loading, synergistic electron-coupling interactions, and more active sites. 106 , 107 However, usually, CDs are combined with other carbon materials (e.g., graphene, reduced GO), 108 some metals (e.g., Ag, Au, Ni, Pd, Fe, Ru), 93 , 109 − 111 or metal-based semiconductors (e.g., Bi 2 O 3 , Co 3 O 4 , MoS 2 ) 104 , 112 , 113 to improve durability and synergistically enhance catalytic activity. For instance, GQDs greatly boosted both OER and HER performance of NiCo 2 P 2 by controlling catalyst morphology, enhancing charge transfer, and improving the catalytic kinetics.…”

Section: Energy Applicationsmentioning

confidence: 99%

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

2020

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Carbon dots (CDs), as a new type of carbon-based nanomaterial, have attracted broad research interest for years, because of their diverse physicochemical properties and favorable attributes like good biocompatibility, unique optical properties, low cost, ecofriendliness, abundant functional groups (e.g., amino, hydroxyl, carboxyl), high stability, and electron mobility. In this Outlook, we comprehensively summarize the classification of CDs based on the analysis of their formation mechanism, micro-/nanostructure and property features, and describe their synthetic methods and optical properties including strong absorption, photoluminescence, and phosphorescence. Furthermore, the recent significant advances in diverse applications, including optical (sensor, anticounterfeiting), energy (light-emitting diodes, catalysis, photovoltaics, supercapacitors), and promising biomedicine, are systematically highlighted. Finally, we envisage the key issues to be challenged, future research directions, and perspectives to show a full picture of CDs-based materials.

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Section: Energy Applicationsmentioning

confidence: 99%

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

2020

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“…The ability of GQD as a unique material has been identified to enhance fuel cell activity as an ORR in catalytic and proton conductivity in the PEM. Fan et al 183 have successfully synthesized heteroatom‐doped GQDs for fuel cell application through the hydrothermal method with two primary precursors existed which were ammonium hydroxide and sodium sulfide. The co‐doped of the heteroatom in GQDs shows the best electrocatalytic activity which attributed to the NC or CSC bonding in metal‐free N, S‐GQDs.…”

Section: Graphene Dots In Fuel Cellmentioning

confidence: 99%

Carbon and graphene quantum dots in fuel cell application: An overview

2020

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Summary Carbon quantum dots (CQD) and graphene quantum dots (GQDs) have been mentioned frequently. They have been selected in recent studies as they have unique and remarkable potential, especially in electrical, optical, and optoelectrical properties. CQD and GQDs have very high chemical and physical stability due to inherent inert carbon material, thus newly recognized as a kind of quantum dots material. Its environmentally friendly, non‐toxic, and naturally inactive nature is also a major attraction for scientists around the world. In this work, CQD and GQDs production methods are discussed in detail, including soft‐template method, hydrothermal method, microwave‐assisted hydrothermal (MAH) method, metal‐catalyzed method, liquid exfoliation method, electron beam lithography method, and others. Additive material has been introduced in CQD and GQDs to increase the ability and performance of CQD and GQDs such as nitrogen, sulfur, chlorine, fluorine, and potassium. In particular, the presence of additive material in CQD and GQDs shows an advantage in terms of energy level, which is very good at achieving specific requirements in properties such as optical, electrical, and optoelectrical. In addition, the existence of functional groups consisting of heteroatoms such as oxygen, nitrogen, sulfur, phosphorus, boron, and so on of zero‐dimensional carbon materials in providing an overabundance of the active electrochemical site for the reaction. The product of CQD and GQDs has various shapes and sizes influenced by several parameters such as synthesis temperature, growth time, source concentration, catalyst, and so on. The application of CQDs and GQDs composites in fuel cells has been clearly and scientifically stated as it has enhanced the performance of fuel cell technology.

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“…The approaches used to synthesize sulfur-doped carbon or graphene quantum dots can be divided into two categories: “top-down” approaches and “bottom-up” approaches. The “top-down” approaches included hydrothermal, solvothermal, ultrasound, chemical exfoliation, microwave-assisted exfoliation methods, and so on [ 102 , 103 , 104 , 105 , 106 ]. Due to their superiority such as time-saving and easy to operation, the “top-down” approaches have attracted much excitement for synthesizing sulfur-doped carbon or graphene quantum dots.…”

Section: Sulfur-containing Quantum Dotsmentioning

confidence: 99%

Biosensors Based on Advanced Sulfur-Containing Nanomaterials

Wang

Jiang

et al. 2020

Sensors

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In recent years, sulfur-containing nanomaterials and their derivatives/composites have attracted much attention because of their important role in the field of biosensor, biolabeling, drug delivery and diagnostic imaging technology, which inspires us to compile this review. To focus on the relationships between advanced biomaterials and biosensors, this review describes the applications of various types of sulfur-containing nanomaterials in biosensors. We bring two types of sulfur-containing nanomaterials including metallic sulfide nanomaterials and sulfur-containing quantum dots, to discuss and summarize the possibility and application as biosensors based on the sulfur-containing nanomaterials. Finally, future perspective and challenges of biosensors based on sulfur-containing nanomaterials are briefly rendered.

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Facile synthesis of defect-rich nitrogen and sulfur Co-doped graphene quantum dots as metal-free electrocatalyst for the oxygen reduction reaction

Cited by 79 publications

References 37 publications

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

Carbon and graphene quantum dots in fuel cell application: An overview

Biosensors Based on Advanced Sulfur-Containing Nanomaterials

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