Boron Carbon Nitride Nanostructures from Salt Melts: Tunable Water-Soluble Phosphors

Lei, Weiwei; Portehault, David; Dimova, Rumiana; Antonietti, Markus

doi:10.1021/ja200838c

Cited by 446 publications

(313 citation statements)

References 38 publications

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“…The spectra of both CNn and low-defected CNa show the typical IR patterns of graphitic carbon nitride (Fig.1b) [37]. The strong bands at 1200-1600 cm -1 are assigned to the stretching vibration of either trigonal C-N(-C)-C or bridging C-NH-C units in the heptazine heterocyclic ring (C6N7) units, while the sharp peak at ~810 cm -1 is considered as their breathing mode.…”

Section: Resultsmentioning

confidence: 98%

Condensed and low-defected graphitic carbon nitride with enhanced photocatalytic hydrogen evolution under visible light irradiation

Cui

Zhang

Lin

et al. 2016

Applied Catalysis B: Environmental

235

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Section: Resultsmentioning

confidence: 98%

Condensed and low-defected graphitic carbon nitride with enhanced photocatalytic hydrogen evolution under visible light irradiation

Cui

Zhang

Lin

et al. 2016

Applied Catalysis B: Environmental

235

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“…S1 is the Fourier transf orm infrared (FTIR) spectrum of the sample, showing two strong peaks at 1400 and 790 cm −1 that are assigned to characteristic absorption bands of B-N bond [35]. The vibrations of the C-related group were all overlapped by that of B-N.…”

Section: Resultsmentioning

confidence: 99%

“…Especially, theoretical and experimental investigations have indicated that visible light absorption and emission with tuneable wavelength can be achieved by controlling the carbon content in (B, N) rich BCN nanostructures, which then can be considered as metal-free light energy converters [33][34][35]. However, the study on this family of ternary photocatalysts is rather rare, although such materials fulfil basic requirements of photocatalysts, including being stable, visible-light responsive, and inexpensive.…”

Section: Science China Materialsmentioning

confidence: 99%

Photocatalytic water oxidation by layered Co/h-BCN hybrids

et al. 2015

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The search for new materials has progressed from metal-based photocatalysts to elemental semiconductors (C, Si, P, S, B) [11][12][13][14][15] and recently to metal-free binary materials and polymers, such as carbon nitride [16], boron carbide [17] and conjugated semiconductors [18][19][20]. These researches indicate that photon absorbing materials can be constituted by using lightweight elements such as carbon, nitrogen, and boron, opening up new opportunities for the selection of innovative and intriguing materials for artificial photosynthesis. It is of particular interest that some of these elements themselves (graphene [21], silicone [22]) or their combinations (h-BN, g-C 3 N 4 ) [23] can form layered structures with reduced thickness comparable to charge-diffusion distance, and thus if a semiconducting electronic structure was imparted in these materials, the fast separation of light-induced charge carrier would significantly benefit surface photoredox process that relied on the excitation and separation of electron-hole pairs and their subsequent participation in surface chemical reactions [24][25][26]. An interesting case of such a layered material is ternary h-BCN with tuneable ba nd gap energies between graphene (zero bandgap) and h-BN (bandgap = 5.6 eV) [27], which have the same atomic structure and share many similar properties. The hybridized phases of the two two-dimensional (2D) materials by atomic mixture of B, N, and C with broad composition ranges to create various layered semiconducting structures would produce new material functions complementary to graphene and h-BN, enabling a wide variety of electronic structures, applications and properties [28][29][30]. Such an emerging family of chemically inert and mechanically strong 2D materials practically allows the bandgap-engineered applications in heterogeneous photocatalysis by creating a medium-gap ternary semiconductor, in which the band gap, redox energy levels, p/n-type properties and surface acid-base chemistry can in principle be modulated by rational design and synthesis [31,32].A hexagonal boron carbon nitride (h-BCN) semiconductor was applied to intercalate cobalt ions to catalyze oxygen evolution reaction (OER) with light illumination, without using noble metals. The h-BCN with high specific surface area showed a strong chemical affinity towards metal ions due to the "lop-sided" densities characteristic of ionic B-N bonding, enabling the creation of metal/h-BCN hybrid layered structures with unique properties. As exemplified here by Co/h-BCN for water oxidation catalysis, after intercalating cobalt ions in the h-BCN host, the photocatalytic activity of the resultant layered hybrid is optimized due to their synergic catalysis that promotes charge separation and lowers reaction barriers. This finding promises a new nobel-metal-free nanocompsite using cost-acceptable and earth-abundant sust ances for photocatalytic OER, and enables the facile design of duel catalytic cascades by merging transition metal catalysis with h-BCN (photo)catalys...

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“…30,31 The incorporation of oxygen to the BCN system has drastically enhanced its color tuning range, which extends from violet to red regions of photoluminescence spectra. The theoretical calculations 21,30 and experimental evidence 19,[31][32][33][34][35][36] have indicated that tunable visible emissions with high quantum yields can be achieved using BCNO compounds which have metal-free phosphors with low toxicity properties. In addition, high external quantum efficiency and a broad range of excitation wavelengths also were obtained.…”

Section: Introductionmentioning

confidence: 99%

New emerging rare-earth free yellow emitting 2D BCNO nanophosphor for white light emitting diodes

et al. 2015

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We have demonstrated a new emerging rare-earth free highly-efficient two dimensional (2D) boron carbon oxynitride (BCNO) yellow emitting nanophosphor with high quantum efficiency for white light emitting diode (WLED) devices. This BCNO nanophosphor exhibits 2D layered structures analogous to hexagonal BN phase. Further, the EELS and XPS results confirm the nanophosphor consisted of B, C, N and O elements. The BCNO nanophosphor shows a broad highly intense yellow emission band centered at 580 nm corresponding to 470 nm excitation wavelength with a quantum efficiency approaching 89%. This novel nanophosphor with strong emission has subsequently been integrated to chip on board (CoB) based blue LEDs in order to fabricate WLEDs devices with a color rendering index of 92. Low color temperature (4899) and better CIE color coordinates (x = 0.3496, y = 0.3679) of a fabricated WLEDs device supports a 2D BCNO nanophosphor that could be an exceptional choice for CoB based WLEDs. Hence, our method provides a facile synthesis of rare-earth free 2D lightweight BCNO nanophosphor and its integration with CoB based blue LEDs for next generation advanced solid state white light applications.

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Boron Carbon Nitride Nanostructures from Salt Melts: Tunable Water-Soluble Phosphors

Cited by 446 publications

References 38 publications

Condensed and low-defected graphitic carbon nitride with enhanced photocatalytic hydrogen evolution under visible light irradiation

Condensed and low-defected graphitic carbon nitride with enhanced photocatalytic hydrogen evolution under visible light irradiation

Photocatalytic water oxidation by layered Co/h-BCN hybrids

New emerging rare-earth free yellow emitting 2D BCNO nanophosphor for white light emitting diodes

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