Efficient Energy-Conversion Materials for the Future: Understanding and Tailoring Charge-Transfer Processes in Carbon Nanostructures

Strauß, Volker; Roth, Alexandra; Sekita, Michael; Guldi, Dirk M.

doi:10.1016/j.chempr.2016.09.001

Cited by 99 publications

(95 citation statements)

References 97 publications

(109 reference statements)

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“…[39][40][41] In other words,acharge separation, in which exTTF are one-electron oxidized and pCNDs are one-electron reduced, evolves upon formation of the initial excited state.T he ultimate fate of the pCNDC À -exTTFC + charge separated state is charge recombination on the timescale of tens of picoseconds and the product is the ground state.A nalyses,w hich were based both on multiwavelength and global methods,provided the means to derive lifetimes of the charge separation and charge recombination processes. The most notable fingerprints of this transient are maxima at 463, 549, and 660 nm as well as a4 23 nm minimum, which are in sound agreement with pulse radiolytic findings focusing on the oxidation of exTTFs.…”

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confidence: 99%

Exploring Tetrathiafulvalene–Carbon Nanodot Conjugates in Charge Transfer Reactions

et al. 2017

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Carbon nanodots (CNDs) were synthesized using low-cost and biocompatible starting materials such as citric acid/urea, under microwave irradiation, and constant pressure conditions. The obtained pressure-synthesized CNDs (pCNDs) were covalently modified with photo- and electroactive π-extended tetrathiafulvalene (exTTF) by means of a two-step esterification reaction, affording pCND-exTTF. The electronic interactions between the pCNDs and exTTF were investigated in the ground and excited states. Ultrafast pump-probe experiments assisted in corroborating that charge separation governs the deactivation of photoexcited pCND-exTTF. These size-regular structures, as revealed by AFM, are stable electron donor-acceptor conjugates of interest for a better understanding of basic processes such as artificial photosynthesis, catalysis, and photovoltaics, involving readily available fluorescent nanodots.

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confidence: 99%

Exploring Tetrathiafulvalene–Carbon Nanodot Conjugates in Charge Transfer Reactions

et al. 2017

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“…[142][143][144][145][146][147] However, a full-fledged understanding on the underlying mechanisms is necessary to build the basis for the application on an industrial scale.…”

Section: Discussionmentioning

confidence: 99%

Review—Single-Walled Carbon Nanohorn-Based Dye-Sensitized Solar Cells

Lodermeyer

Costa

Guldi

2017

ECS J. Solid State Sci. Technol.

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Efforts in the broad field of dye-sensitized solar cells (DSSC) are governed by four key challenges: i) the development of photoelectrodes with high charge injection yields and charge collection efficiencies, ii) the development of low-cost buffer layers, which effectively reduce the back reaction of electrons from the transparent conductive oxide (TCO) to the electrolyte, iii) the design of platinum-free counter electrodes (CE), which feature good electrolyte regeneration yields, and iv) the implementation of (quasi) solid-state and iodine-free electrolytes featuring excellent ionic diffusion and conductivity.

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“…The converted film is best described as a conductive carbon matrix embedding Fe 2 O 3 NPs. A great advantage is the small size of the CNDs that enables a more homogeneous mixture of the starting materials and thus a fine dispersion of small size Fe 2 O 3 NPs in the carbon matrix, which is a necessity for enabling a large number of Faradaic reactions . The presence of Fe 2 O 3 NPs increases the specific surface area of 3DtsG by a factor of three.…”

Section: Introductionmentioning

confidence: 95%

Carbon Nanodots as Feedstock for a Uniform Hematite‐Graphene Nanocomposite

Strauß

Anderson

Wang

et al. 2018

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High degrees of dispersion are a prerequisite for functional composite materials for applications in electronics such as sensors, charge and data storage, and catalysis. The use of small precursor materials can be a decisive factor in achieving a high degree of dispersion. In this study, carbon nanodots are used to fabricate a homogeneous, finely dispersed Fe2O3‐graphene composite aerogel in a one‐step conversion process from a precursor mixture. The laser‐assisted conversion of small size carbon nanodots enables a uniform distribution of 6.5 nm Fe2O3 nanoparticles during the formation of a highly conductive carbon matrix. Structural and electrochemical characterization shows that the features of both material entities are maintained and successfully integrated. The presence of Fe2O3 nanoparticles has a positive effect on the active surface area of the carbon aerogel and thus on the capacitance of the material. This is demonstrated by testing the performance of the composite in supercapacitors. Faradaic reactions are exploited in an aqueous electrolyte through the high accessible surface of the incorporated small Fe2O3 nanoparticles boosting the specific capacitance of the 3D turbostratic graphene network significantly.

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Efficient Energy-Conversion Materials for the Future: Understanding and Tailoring Charge-Transfer Processes in Carbon Nanostructures

Cited by 99 publications

References 97 publications

Exploring Tetrathiafulvalene–Carbon Nanodot Conjugates in Charge Transfer Reactions

Exploring Tetrathiafulvalene–Carbon Nanodot Conjugates in Charge Transfer Reactions

Review—Single-Walled Carbon Nanohorn-Based Dye-Sensitized Solar Cells

Carbon Nanodots as Feedstock for a Uniform Hematite‐Graphene Nanocomposite

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