Photoelectrochemical activity of graphene quantum dots/hierarchical porous TiO2 photoanode

Azimirad, R.; Safa, S.; Ebrahimi, Mohammad; Yousefzadeh, Samira; Moshfegh, A.Z.

doi:10.1016/j.jallcom.2017.05.301

Cited by 39 publications

(25 citation statements)

References 84 publications

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“…Interestingly, it has been shown that depending on the deposition method, GQDs can also play different roles in the photoanode performance. For instance, authors employed two different methods 88 to deposit GQDs on TiO 2 photoanodes, which led to a considerable difference in charge transfer and PEC performance. By using spin coating as deposition method, GQDs behave as a photosensitizer donating electrons to the CB of the semiconductor.…”

Section: Metal Oxides/graphenementioning

confidence: 99%

Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting

et al. 2021

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Section: Metal Oxides/graphenementioning

confidence: 99%

Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting

et al. 2021

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“…The electrical properties of graphene quantum dots‐based nancomposites can also take advantage of the synergistic effect occurring between an inorganic and semiconducting matrix and the carbon nanostructures. The synthesis of nanocomposites made of graphene quantum dots and hierarchical porous titania, for instance, has proved to exceed the photoelectrochemical activity of a pure titania system because of a charge‐transfer mechanism, in agreement with the findings between nanocrystalline titania films and graphene …”

Section: Graphene Quantum Dots In Sol‐gel Materialsmentioning

confidence: 99%

Sol‐Gel Chemistry for Carbon Dots

Malfatti

Innocenzi

2018

The Chemical Record

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Carbon dots are an emerging class of carbon-based nanostructures produced by low-cost raw materials which exhibit a widely-tunable photoluminescence and a high quantum yield. The potential of these nanomaterials as a substitute of semiconductor quantum dots in optoelectronics and biomedicine is very high, however they need a customized chemistry to be integrated in host-guest systems or functionalized in core-shell structures. This review is focused on recent advances of the sol-gel chemistry applied to the C-dots technology. The surface modification, the fine tailoring of the chemical composition and the embedding into a complex nanostructured material are the main targets of combining sol-gel processing with C-dots chemistry. In addition, the synergistic effect of the sol-gel precursor combined with the C-dots contribute to modify the intrinsic chemo-physical properties of the dots, empowering the emission efficiency or enabling the tuning of the photoluminescence over a wide range of the visible spectrum.

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“…Carbon quantum dots (CQDs), new zero-dimensional carbon nanomaterials whose size are similar with conventional semiconductor quantum dots but the skeleton is based on carbon, have attracted tremendous research interest after been found (Jaleel and Pramod, 2018;Kaur et al, 2018;Riyanto et al, 2019;Wang et al, 2019;Zhou et al, 2019). And CQDs have been expected to have large potential application in biomedicine (Jaleel and Pramod, 2018), photovoltaic device Kaur et al, 2018), ion detection (Wu et al, 2014;Arumugam and Kim, 2018;Wang et al, 2018;Zhang et al, 2018;Omer et al, 2019), photocatalysis (Yu et al, 2014;Azimirad et al, 2017;Zhang B. et al, 2017;Syed et al, 2019), and other fields due to their fascination optical and electro-optical properties (Shao et al, 2016;Pramanik et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

et al. 2020

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Low-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs usually emit green or blue fluorescence. Herein, a facile two-step oxidation approach (K 2 FeO 4 pre-oxidation and H 2 O 2 oxidation) was proposed to fabricate bandgap tunable CQDs from anthracite. The K 2 FeO 4 pre-oxidation can not only weaken the non-bonding forces among coal molecules which cause the expansion of coal particles, but also form a large number of active sites on the surface of coal particles. The above effects make the bandgap tunable CQDs (blue, green, or yellow fluorescence) can be quickly obtained from anthracite within 1 h in the following H 2 O 2 oxidation by simply adjusting the concentration of H 2 O 2 . All the as-prepared CQDs contain more than 30 at% oxygen, and the average diameters of which are <10 nm. The results also indicate that the high oxygen content only can create new energy states inside the band gap of CQDs with average diameter more than 3.2 ± 0.9 nm, which make the as-prepared CQDs emit green or yellow fluorescence.

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Photoelectrochemical activity of graphene quantum dots/hierarchical porous TiO2 photoanode

Cited by 39 publications

References 84 publications

Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting

Challenges and prospects about the graphene role in the design of photoelectrodes for sunlight-driven water splitting

Sol‐Gel Chemistry for Carbon Dots

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

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