Carbon dots for photocatalytic H<sub>2</sub> production in aqueous media with molecular Co catalysts

Ladomenou, Kalliopi; Λάνδρου, Γεώργιος; Charalambidis, Georgios; Nikoloudakis, Emmanouil; Coutsolelos, Athanassios G.

doi:10.1039/d0se01630f

Cited by 22 publications

(41 citation statements)

References 53 publications

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“…In these photocatalytic systems, H 2 production was detected after about 13 h of irradiation for all catalysts. This was also the case in our previous work, where under similar conditions H 2 production was observed after 10 to 15 hours [12] . The only difference was the light source and the molecular catalyst.…”

Section: Resultssupporting

confidence: 85%

“…The most successful photocatalytic system was the one that used NCdot as photosensitizer, a mixture of 0.1 M each, TCEP/Asc (1 : 1) as SED at pH=5 and a white led as a light source. When Cdot was used as photosensitizer, no hydrogen could be detected, possibly due to the better charge transfer of NCdot , since the presence of nitrogen produce a material with n‐domains as already have been mentioned by us and others [9,12,52] . The presence of C−N species in nitrogen doped carbon dots are shown with XPS analysis of the material.…”

Section: Resultsmentioning

confidence: 52%

“…The preparation of carbon dot materials was done according to our previous published work [12] . To extend the characterization of these photosensitizers, we performed 1 H‐NMR and X‐ray photoelectron spectroscopy (XPS) analysis.…”

Section: Resultsmentioning

confidence: 99%

“…In our recent work, we described the synthesis of carbon dots ( Cdot ) and nitrogen‐doped carbon dots ( NCdot ) as well as their physical and structural characterization [12] . In addition, we studied the ability of these materials to evolve H 2 production quite efficiently with the use of molecular cobalt catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…They are noble metal‐free and are synthesized with low‐cost preparation techniques on a large scale [8–11] . These types of light harvesters have already been used for hydrogen production by our group and others, and they produce promising results, despite the limited number of studies that have been performed [12–13] . On the other hand, it is important to use appropriate catalysts that can efficiently produce hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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Nickel Complexes and Carbon Dots for Efficient Light‐Driven Hydrogen Production

et al. 2021

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Nitrogen‐doped carbon dots were used as photosensitizers for H2 evolution in the presence of a series of mononuclear thiosemicarbazone nickel complexes. The catalysts were designed to display different substituents at the para position of the phenyl rings. These chemical modifications tune the electron‐donating abilities of the complexes and influence their capability to reduce protons into hydrogen. All photocatalytic experiments were performed in aqueous solution, using as sacrificial electron donor TCEP/Asc (1 : 1), 0.1 M each, at pH=5. The complex bearing the most electron‐donating ligand with the dimethylamino (N(CH3)2) substituent behaves as the best catalyst in our series of photocatalytic systems with TONCAT=148, under white led radiation for 30 h. Therefore, this noble metal‐free system can effectively produce hydrogen in water and further chemical modification of the ligand will likely improve its production.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nickel Complexes and Carbon Dots for Efficient Light‐Driven Hydrogen Production

et al. 2021

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Carbon Dots Based Photoinduced Reactions: Advances and Perspective

Zeng

Tao

et al. 2023

Advanced Science

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Seeking clean energy as an alternative to traditional fossil fuels is the inevitable choice to realize the sustainable development of the society. Photocatalytic technique is considered a promising energy conversion approach to store the abundant solar energy into other wieldy energy carriers like chemical energy. Carbon dots, as a class of fascinating carbon nanomaterials, have already become the hotspots in numerous photoelectric researching fields and particularly drawn keen interests as metal-free photocatalysts owing to strong UV-vis optical absorption, tunable energy-level configuration, superior charge transfer ability, excellent physicochemical stability, facile fabrication, low toxicity, and high solubility. In this review, the classification, microstructures, general synthetic methods, optical and photoelectrical properties of carbon dots are systematically summarized. In addition, recent advances of carbon dots based photoinduced reactions including photodegradation, photocatalytic hydrogen generation, CO 2 conversion, N 2 fixation, and photochemical synthesis are highlighted in detail, deep insights into the roles of carbon dots in various systems combining with the photocatalytic mechanisms are provided. Finally, several critical issues remaining in photocatalysis field are also proposed.

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A Series of Cobalt bis(Thiosemicarbazone) Catalysts for Effective Photocatalytic Hydrogen Evolution Reaction

Papadakis,

Landrou,

Poisson

et al. 2023

Eur J Inorg Chem

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In order to diminish environmental issues such as global warming due to increased carbo dioxide (CO2) emissions, considerable efforts have been made in the research community. Photocatalytic hydrogen (H2) production is a very important way towards this goal, since sunlight is an abundant source of energy and H2 is a clean fuel, producing no greenhouse gases. Inexpensive, stable and non‐toxic carbon dots were easily synthesized and used as photosensitizers in water in the presence of a series of molecular cobalt catalysts (CoTSC). The catalysts were thiosemicarbazone‐based complexes able to transfer electrons for hydrogen evolution reaction. Under visible light irradiation, the nitrogen‐doped carbon dots (NCdots) transfer the photoexcited electrons to the catalyst, producing an activity of 358 μmol gNCdot‐1h‐1 (TONCo=570) for CoTSC‐N(CH3)2CN after 24h of irradiation. These types of molecular catalysts display great activity and stability in combination with the easily synthesized and modified carbon dot materials.

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Carbon dots for photocatalytic H₂ production in aqueous media with molecular Co catalysts

Abstract: Carbon dots and nitrogen doped carbon dots were effectively synthesized and characterized. Their use as H2 light harvesters was examined in the presence of three different cobalt-based catalysts and tris(carboxyethyl)phosphine/ascorbic...

Cited by 22 publications

References 53 publications

Nickel Complexes and Carbon Dots for Efficient Light‐Driven Hydrogen Production

Nickel Complexes and Carbon Dots for Efficient Light‐Driven Hydrogen Production

Carbon Dots Based Photoinduced Reactions: Advances and Perspective

A Series of Cobalt bis(Thiosemicarbazone) Catalysts for Effective Photocatalytic Hydrogen Evolution Reaction

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Carbon dots for photocatalytic H2 production in aqueous media with molecular Co catalysts

Abstract: Carbon dots and nitrogen doped carbon dots were effectively synthesized and characterized. Their use as H2 light harvesters was examined in the presence of three different cobalt-based catalysts and tris(carboxyethyl)phosphine/ascorbic...

Cited by 22 publications

References 53 publications

Nickel Complexes and Carbon Dots for Efficient Light‐Driven Hydrogen Production

Nickel Complexes and Carbon Dots for Efficient Light‐Driven Hydrogen Production

Carbon Dots Based Photoinduced Reactions: Advances and Perspective

A Series of Cobalt bis(Thiosemicarbazone) Catalysts for Effective Photocatalytic Hydrogen Evolution Reaction

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Product

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Carbon dots for photocatalytic H₂ production in aqueous media with molecular Co catalysts