Carbon dots enhance the interface electron transfer and photoelectrochemical kinetics in TiO2 photoanode

Han, Yidong; Wu, Jie; Li, Yang; Gu, Xiaoqing; He, Tiwei; Zhao, Yu; Huang, Hui; Liu, Yang; Kang, Zhenhui

doi:10.1016/j.apcatb.2021.120983

Cited by 63 publications

(34 citation statements)

References 60 publications

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“…For instance, two positive effects could be induced by coupling CDs with TiO 2 photoanode. 65 One was that an electron-trap effect was triggered and the generated electrons were captured by CDs, preventing fast recombination of the electron−hole pairs. The other was that the charge transfer rate for the composite system was increased probably due to the interaction of the functional groups of CDs with titanium dioxide, leading to a high photogenerated charge separation efficiency.…”

Section: Coupling With Metal-based Materialsmentioning

confidence: 99%

“…Transition metal species bear high redox reaction abilities and regulatory band gaps, and a great deal of effort has been naturally devoted to coupling them with CDs. For instance, two positive effects could be induced by coupling CDs with TiO 2 photoanode . One was that an electron-trap effect was triggered and the generated electrons were captured by CDs, preventing fast recombination of the electron–hole pairs.…”

Section: Strategies To Tailor Cds For Specific Applicationsmentioning

confidence: 99%

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Diversity and Tailorability of Photoelectrochemical Properties of Carbon Dots

2022

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Conspectus As a new kind of carbon based functional material, carbon dots (CDs) have sparked much interest in recent years. The tunable structure, composition, and morphology of CDs unlocks opportunities to enable diversity in their photoelectrochemical properties, and thus they show great potential in various applications such as biology, catalysis, sensors, and energy storage. Nevertheless, the related understanding of CDs is insufficient at present due to their inherent complexity of microstructure, which involves the intersection of high polymer, bulk carbon, and quantum dot (QD). A good understanding of the underlying mechanism behind the properties of CDs is still a formidable challenge, requiring the integration of robust knowledge from organic chemistry, materials science, and solid state physics. Within this context, discovering more appealing properties, elucidating fundamental factors that affect the properties and proposing effective engineering strategies that can realize specific functions for CDs are now highly pursued by researchers. At the beginning of this Account, the main features of CDs are introduced, where not only the basic structural, compositional and morphological characteristics but also the rich photoelectrochemical properties are elucidated, among which the band gap, chirality, photoinduced potential, and electron sink effect are particularly emphasized. Furthermore, new analysis techniques including transient photoinduced current (TPC), transient photoinduced voltage (TPV), and machine learning (ML) to reveal the unique properties of CDs are described. Then, several appealing strategies that aim to rationally tailor CDs for oriented applications are highlighted. These regulation strategies are morphology modulation (e.g., developing CDs with new geometrical configuration, controlling the particle size), phase engineering (e.g., altering the phase crystallinity, introducing the foreign atoms), surface functionalization (e.g., grafting various types of functional groups), and interfacial tuning (e.g., building CD-based nanohybrids with well-defined interfaces). Although the fundamental investigation of CDs is relatively undeveloped because of their complexity, this does not hinder their wide application. At the same time, exploring the extensive applications of CDs will promote their in-depth understanding. Finally, the chances for building a CD-centered blueprint for sustainable society are explored and challenges for future research in the field of CDs are proposed as follows: (i) the controllable synthesis of CDs with uniform size; (ii) search for novel CDs with unique structure, morphology, or composition; (iii) quantitative understanding of the property of CDs; (iv) performance enhancement by external forces such as magnetism or heat injection; (v) construction of the dual carbon concept; (vi) further research on different photocatalytic applications. On the whole, this Account may provide meaningful references for the understanding of the microstructure–property correlation as w...

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Section: Coupling With Metal-based Materialsmentioning

confidence: 99%

Section: Strategies To Tailor Cds For Specific Applicationsmentioning

confidence: 99%

Diversity and Tailorability of Photoelectrochemical Properties of Carbon Dots

2022

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“…To further analyze the frequency and time characteristics of this non-static signal, we adopted the continuous wavelet transform (CWT) based on Bior3.9 to analyze both time and frequency scales. 46 We selected three frequencies f = 2 Hz, f = 4 Hz, and f = 10 Hz, and the CWT signal in the whole-time scale is shown in Fig. 6(c).…”

Section: Paper Materials Advancesmentioning

confidence: 99%

Diverse catalytic behavior of a dye-based polymer metal-free catalyst for hydrogen peroxide photoproduction

Qiang

et al. 2022

Mater. Adv.

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“…[2][3][4] With the in-depth studies of CDs, they have been widely applied in various fields such as bioimaging, drug delivery, biosensing, and photocatalysis. [5][6][7][8][9][10][11] CDs refer to zero-dimensional (0D) carbonbased materials with dimensions below 10 nm. [12][13][14] Similar to other fluorescent nanomaterials, such as semiconductor quantum dots (QDs) and noble metal nanoclusters, CDs possess interesting photoluminescence (PL) properties.…”

Section: Introductionmentioning

confidence: 99%