Carbon‐Based Dots Co‐doped with Nitrogen and Sulfur for High Quantum Yield and Excitation‐Independent Emission

Dong, Yongqiang; Pang, Haijun; Yang, Hong; Guo, Chunxian; Shao, Jingwei; Chi, Yuwu; Li, Chang Ming; Yu, Ting

doi:10.1002/anie.201301114

Cited by 1,992 publications

(1,309 citation statements)

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“…27 In addition, the C 1s can be further deconvoluted into peaks positioned at 284.8, 285.8, and 288.8 eV, which may attributed to C=C, C=N/C-O/C-S, and C-N, respectively. 55,[64][65][66] Combining XPS analysis with XRD results, it is believed that the products derived from the sulfurization of ZIF-67 at high temperatures are basically Co x S y supported on N,S-codoped carbon composites. The textural characteristics of the as-synthesised composites were analysed by N 2 sorption at -196 o C. While sample Co x S y @C-600 exhibits a large hysteresis loop between its adsorption and desorption branches, implying the existence of mesoporous feature due to the voids between particles, the other two samples Co x S y @C-800, and Co x S y @C-1000 show largely reversible adsorption-desorption isotherms.…”

Section: Resultsmentioning

confidence: 99%

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

et al. 2015

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Exploring highly-efficient and low-cost bifunctional electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reactions (OER) in the renewable energy area has gained its momentum but still remains a significant challenge. Here we represent a simple but efficient way that utilizes ZIF-67 as the precursor and template for the one-step generation of homogeneous dispersed cobalt sulfide/N,S-codoped porous carbon nanocomposites as high-performance electrocatalysts. Due to the favourable molecular-like structural features and uniform dispersed active sites in the precursor, the resulting nanocomposites featured with unique core-shell structure, high porosity, homogeneous dispersion active components together with N and S-doping effect, not only show excellent electrocatalytic activity towards ORR with the high onset potential (around -0.04 V vs -0.02 V for benchmark Pt/C catalyst) and four-electron pathway, and OER with a small overpotential of 0.47 V for 10 mA cm −2 current density, but also exhibit superior stability (92%) to commercial Pt/C catalyst (74%) in ORR and promising OER stability (80%) with good methanol tolerance. Our findings suggest that the transition metal sulfide-porous carbon nanocomposites derived from the one-step simultaneously sulfurization and carbonization of zeolitic imidazolate frameworks are excellent alternative bifuncitonal electrocatalysts towards ORR and OER in the next generation of energy storage and conversion technologies.With the depletion of hydrocarbon-based energy resources and the increasing global energy demands, it is imperative to develop green and sustainable energy storage and conversion technologies as alternatives to currently widely used fossil fuels. 1-3 Electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play key roles in several important next-generation energy storage and conversion technologies, such as fuel cells, metal-air batteries and water splitting. [4][5][6][7][8][9][10][11][12][13] Hitherto, most efficient electrocatalysts for ORR/OER contain precious metals including Pt or Ir; however, due to the prohibitive cost, poor stability of precious metals, the sluggish kinetics for ORR and the large polarisation, it is highly desirable to discover highly efficient and low-cost earthabundant non-precious electroactive materials that can rival the performances of precious metal-based catalysts. 14-17Many efforts have, therefore, been devoted to transition metal oxides/sulfides based materials, as many transition metals like cobalt, manganese have been widely considered to be electrochemical active for ORR and OER. Particularly, cobalt sulfides (Co x S y ) with different phases have been previously investigated as ORR and OER electrode catalysts and exhibited attractive electrocatalytic performance among different nonprecious and late transition metal chalcogenides.18 Co 9 S 8 is a good catalyst for ORR. 21 However, the complicated preparation procedures coupled with the low electrical conductivities of cobalt s...

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Section: Resultsmentioning

confidence: 99%

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

et al. 2015

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“…In addition, simple physisorption through π-stacking was used to load the anticancer drug doxorubicin onto NGO functionalized with antibody for selective 162 15 fluorescent GQDs with a QY of 54.5%. 158 Recently, Dong and co-workers used L-cysteine as precursor to prepare S,N-co-doped GQDs with a QY up to 73%, 159 which is the highest value reported so far.…”

Section: Fluorescent Graphene Quantum Dotsmentioning

confidence: 99%

Ultra-small fluorescent inorganic nanoparticles for bioimaging

et al. 2014

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“…32 According to the literature, Dong et al assumed an enhancement in the QY values of N,S-doped CNDs in two aspects. 31 First, the doping of nitrogen to CNDs introduces new types of surface states, which are able to facilitate radiative recombinations, resulting in increases in the QY values. Second, the co-existence of sulfur together with nitrogen further enhances the effect of nitrogen atoms in doped CND through a cooperative effect.…”

Section: Qy Values Of Cnds From Binary Mixtures Of Amino Acidsmentioning

confidence: 99%

Effect of the Elemental Composition of Precursors from Amino Acids and Their Binary Mixtures on the Photoluminescent Intensity of Carbon Nanodots

et al. 2017

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Experimental ReagentsGlycine (Sigma Aldrich, ≥99%), L-glutamic acid (Sigma Aldrich, ≥99.0%), and L-cysteine (Sigma Aldrich, 97.0%) were used as received. 2-Morpholinoethanesulfonic acid monohydrate 2017 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. E-mail: kotaro@sci.toho-u.ac.jp Effect of the Elemental Composition of Precursors from Amino Acids and Their Binary Mixtures on the Photoluminescent Intensity of Carbon NanodotsKotaro MORITA, † Shusei KURUSU, Haruka KODAMA, and Naoki HIRAYAMA Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi 274-8510, JapanWe report on the photoluminescent (PL) properties of carbon nanodots (CNDs) doped with nitrogen and sulfur obtained by the pyrolytic carbonization of amino acids as precursors. Prepared CNDs exhibit stable PL emission under a wide variety of aqueous conditions. The results also provided the way to tune a PL intensity of CNDs by varying the amount of heteroatoms in precursors with a binary mixture of amino acids. The PL quantum yields of the obtained CNDs were determined to be from 0.079 to 0.571.

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Carbon‐Based Dots Co‐doped with Nitrogen and Sulfur for High Quantum Yield and Excitation‐Independent Emission

Cited by 1,992 publications

References 44 publications

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

Ultra-small fluorescent inorganic nanoparticles for bioimaging

Effect of the Elemental Composition of Precursors from Amino Acids and Their Binary Mixtures on the Photoluminescent Intensity of Carbon Nanodots

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