Photoactive materials based on semiconducting nanocarbons – A challenge opening new possibilities for photocatalysis

Perathoner, Siglinda; Ampelli, Claudio; Chen, Shiming; Passalacqua, Rosalba; Su, Dangsheng

doi:10.1016/j.jechem.2017.01.005

Cited by 34 publications

(13 citation statements)

References 134 publications

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“…Metal-free carbocatalysis 1,24,35,39,40,49,[70][71][72][73][74][75][76] has inspired many studies in recent years, but most centred on the use of functional sp 2 -type nanocarbons, such as graphene and CNT families. Less attention has been instead paid to other types of nanocarbon materials, particularly to sp 3 -hybridized ultradispersed nanodiamonds (NDs) and their derivatives (UNDDs), including sp 3 /sp 2 -hybridized bucky nanodiamonds (BNDs) and sp 2 -hybridized onion-like carbons (OLCs).…”

Section: Hybrid Sp 2 /Sp 3 Nanocarbonsmentioning

confidence: 99%

Catalysis by hybrid sp²/sp³nanodiamonds and their role in the design of advanced nanocarbon materials

et al. 2018

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Section: Hybrid Sp 2 /Sp 3 Nanocarbonsmentioning

confidence: 99%

Catalysis by hybrid sp²/sp³nanodiamonds and their role in the design of advanced nanocarbon materials

et al. 2018

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“…Their electric properties depend on their oxidized/reduced states and the number and nature of their functional groups. Nevertheless, the photocatalytic activity of carbon nanostructures needs considerable further studies [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…The origin of this phenomenon is said to be that they behave as semiconductors.Their electric properties depend on their oxidized/reduced states and the number and nature of their functional groups. Nevertheless, the photocatalytic activity of carbon nanostructures needs considerable further studies [19][20][21][22][23][24].There are several ways how photocatalytic oxide layers can be deposited on monolithic substrates as the aerogels (e.g. sol-gel synthesis, CVD, sputtering) [18].…”

mentioning

confidence: 99%

Photocatalytic properties of TiO2@polymer and TiO2@carbon aerogel composites prepared by atomic layer deposition

Justh

Mikula

Bakoš

et al. 2019

Carbon

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Monolithic structured TiO2/aerogel composites were prepared from resorcinol-formaldehyde polymer aerogel (RFA) and its carbon aerogel (RFCA) derivative. A resorcinol-formaldehyde hydrogel was synthesized in a sol-gel reaction and transformed into polymer aerogel by supercritical drying. The RFA was converted to carbon aerogel by pyrolysis at 900 °C in dry N2.Amorphous and crystalline TiO2 layers were grown from TiCl4 and H2O precursors by atomic layer deposition (ALD) at 80 °C and 250 °C, respectively, on both RFA and RFCA. The substrates and the composites were studied by N2 adsorption, TG/DTA-MS, Raman, SEM-EDX and TEM techniques. Their photocatalytic activity was compared in the UV catalyzed decomposition reaction of methyl orange dye. Keywordsresorcinol-formaldehyde polymer aerogel, carbon aerogel, photocatalysis, ALD, TiO2 IntroductionBeside crystalline carbonaceous nanomaterials such as fullerene, graphene, graphene oxide, nanodiamond, carbon nanospheres, carbon nanotubes; mesoporous carbon aerogels have attracted a great deal of attention. Carbon aerogels, available also in monolithic form, have several favorable properties, for example they can be used as adsorbents or as substrates for catalysts, because of their robustness and high specific surface area [1,2]. They are also excellent thermal and phonic insulators, while conduct electricity. These properties can be tuned through their synthesis conditions. [3][4][5][6][7] Resorcinol-formaldehyde (RF) organic aerogels, that Pekala and co-workers synthetized for the first time [8], undergo two main stages during preparation. In the first stage a hydrogel is prepared by a sol-gel process and in the second stage after drying the aerogel is obtained. The resorcinol-formaldehyde polymer aerogel becomes a carbon aerogel in a consecutive third stage, which is carbonization occasionally followed by activation. Depending on the conditions carbonization or activation influence the structural and performance characteristics, like the specific surface area, significantly [9][10][11][12].Photocatalytic carbon nanocomposites have great potential in the field of environmental remediation, water splitting and self-cleaning surfaces [13,14]. Among the various semiconductor oxide photocatalysts TiO2 is researched widely, due to being stable and nontoxic. TiO2 has ideal band gap width for the half reactions of water splitting and its composites with other nanomaterials, such as carbon nanostructures, may enhance the photocatalytic activity. However, its use still faces some difficulties, such as a narrow light response range limited to UV. The carbon nanostructure inhibits the recombination by promoting the charge separation as an electron acceptor. This effect and the widening of the wavelength response range through Ti-O-C bonds as well as modifying the photocatalytic selectivity are three advantages of TiO2 composites [3,[15][16][17][18]. Moreover, a number of studies indicates that nanoporous or nanostructured carbon materials, such as activated carbon or graphene-oxide...

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“…Excessive burning of fossil fuels has caused a rapid rise in carbon dioxide (CO 2 , a greenhouse gas) concentration in the atmosphere, which triggers serious environmental concerns [1][2][3] . Developing renewable energy (e.g., solar, tidal, and wind) tech-nology is considered as an ideal solution to simultaneously address both the environmental and energy crisis [4][5][6][7][8][9] . Among various approaches [10][11][12][13] , direct electrochemical CO 2 conversion into chemicals or fuels offers the advantages in renewable energy transformation and storage as well as the reduction in CO 2 emission.…”

Section: Introductionmentioning

confidence: 99%

Rational design of carbon-based metal-free catalysts for electrochemical carbon dioxide reduction: A review

Liu

Yang

et al. 2019

Journal of Energy Chemistry

108

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Photoactive materials based on semiconducting nanocarbons – A challenge opening new possibilities for photocatalysis

Cited by 34 publications

References 134 publications

Catalysis by hybrid sp²/sp³nanodiamonds and their role in the design of advanced nanocarbon materials

Catalysis by hybrid sp²/sp³nanodiamonds and their role in the design of advanced nanocarbon materials

Photocatalytic properties of TiO2@polymer and TiO2@carbon aerogel composites prepared by atomic layer deposition

Rational design of carbon-based metal-free catalysts for electrochemical carbon dioxide reduction: A review

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Photoactive materials based on semiconducting nanocarbons – A challenge opening new possibilities for photocatalysis

Cited by 34 publications

References 134 publications

Catalysis by hybrid sp2/sp3nanodiamonds and their role in the design of advanced nanocarbon materials

Catalysis by hybrid sp2/sp3nanodiamonds and their role in the design of advanced nanocarbon materials

Photocatalytic properties of TiO2@polymer and TiO2@carbon aerogel composites prepared by atomic layer deposition

Rational design of carbon-based metal-free catalysts for electrochemical carbon dioxide reduction: A review

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Catalysis by hybrid sp²/sp³nanodiamonds and their role in the design of advanced nanocarbon materials

Catalysis by hybrid sp²/sp³nanodiamonds and their role in the design of advanced nanocarbon materials