Carbon quantum dots modified anatase/rutile TiO2 photoanode with dramatically enhanced photoelectrochemical performance

Zhou, Tingsheng; Chen, Shuai; Li, Linsen; Wang, Jiachen; Zhang, Yan; Li, Jinhua; Bai, Jing; Xia, Ligang; Xu, Qing; Rahim, Mohammadi; Zhou, Baoxue

doi:10.1016/j.apcatb.2020.118776

Cited by 166 publications

(78 citation statements)

References 53 publications

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“…The response appears in the fourth quadrant of the plane, where the frequency at the apex can be related to the time constant of the charge transfer. According to the formula, [52,53]…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photoelectrochemical Water Splitting on Nickel‐Doped Cobalt Phosphate by Modulating both Charge Transfer and Oxygen Evolution Efficiencies

et al. 2021

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Detrimental charge recombination at photoanode/electrolyte junctions severely impedes photoelectrochemical (PEC) performance. The deposition of cobalt phosphate (CoPi) onto photoanodes is an efficient approach to achieve high PEC efficiency. However, achieving performances at the required remains a huge challenge, owing to the passivation effect of CoPi. In this study, function‐tunable strategy, whereby the passivation role is switched with the activation role, is exploited to modulate PEC performance through simultaneous activation of interface charge transfer and surface catalysis. By depositing nickel‐doped CoPi onto a BiVO4 (BV) substrate, the integrated system (BV/Ni1Co7Pi) exhibits a remarkable photocurrent density (4.15 mA cm−2), which is a 4.6‐fold increase relative to BV (0.90 mA cm−2). Moreover, the satisfactory performance can be also achieved on α‐Fe2O3 photoanode. These findings provide guidance for improving the efficiency of CoPi on photoanodes for PEC water oxidation.

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“…The response appears in the fourth quadrant of the plane, where the frequency at the apex can be related to the time constant of the charge transfer. According to the formula, [52,53]…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photoelectrochemical Water Splitting on Nickel‐Doped Cobalt Phosphate by Modulating both Charge Transfer and Oxygen Evolution Efficiencies

et al. 2021

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“…For example, CPDs-modified anatase/rutile TiO 2 worked as the photoanode for PEC water splitting with a much increased efficiency, because of CPDs simultaneously enhancing the OER kinetics and UV–vis light harvesting. 114 Furthermore, utilizing a superior up-conversion performance and enhanced hole–electron separation, the introduction of CPDs could greatly improve the PEC activity toward organic pollutants of {001}TiO 2 /Ti ( Figure 4 b). 115 However, the clear working mechanism of CDs-based catalysts is still under investigation, and much effort needs to be devoted to making a breakthrough in the near future.…”

Section: Energy Applicationsmentioning

confidence: 99%

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

2020

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Carbon dots (CDs), as a new type of carbon-based nanomaterial, have attracted broad research interest for years, because of their diverse physicochemical properties and favorable attributes like good biocompatibility, unique optical properties, low cost, ecofriendliness, abundant functional groups (e.g., amino, hydroxyl, carboxyl), high stability, and electron mobility. In this Outlook, we comprehensively summarize the classification of CDs based on the analysis of their formation mechanism, micro-/nanostructure and property features, and describe their synthetic methods and optical properties including strong absorption, photoluminescence, and phosphorescence. Furthermore, the recent significant advances in diverse applications, including optical (sensor, anticounterfeiting), energy (light-emitting diodes, catalysis, photovoltaics, supercapacitors), and promising biomedicine, are systematically highlighted. Finally, we envisage the key issues to be challenged, future research directions, and perspectives to show a full picture of CDs-based materials.

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“…Similar examples include the recently developed anatase‐TiO 2 nanothorns on rutile‐TiO 2 nanorods (Figure 3e). [ 96 ]…”

Section: Qds‐based Pec Systemmentioning

confidence: 99%

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

Liu

Zhao

Wang

et al. 2021

Advanced Energy Materials

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opportunity since it is by far the most abundant, sustainable, carbon-neutral, and inexpensive energy source. The theoretical potential of solar power striking the earth's surface is ≈89 300 TW (the integral of the time-and-space-averaged solar flux 342.5 W m −2 over the earth's surface area 5.11 × 10 14 m 2 , estimating that ≈30% and ≈19% are scattered and absorbed by the atmosphere and clouds), [3] which is equivalent to ≈6000 times the power used worldwide every year (estimated at 13.5 TW in 2001, with projected growth up to 27.6 TW by 2050 by the Intergovernmental Panel on Climate Change). [4] In particular, storing solar energy in the form of H 2 presents advantages such as high energy content per mass (143 MJ kg −1), ease of transportation, and cost-effectiveness, [5] thereby addressing the storage challenge which is associated with the diffuse and intermittent character of solar irradiation. Solar energy and water could be converted into H 2 [5b] indirectly by using solar-converted electricity and an electrolyzer, [6] concentrated solar thermal and an electrolyzer, [7] biological and thermochemical processes [8] or directly by photo-/photoelectrocatalysis of water. [1b,f,g] The combination of the energy conversion step with electrolyzers is always limited by the performance of the electrolyzers, whose typical commercial efficiencies are around 73%. [9] Besides, indirect technologies suffer from excessive cost, area requirements, feasibility issues, or energy loss. [10] An alternative direct route is the photo-/photoelectrocatalysis of water, including powdered photocatalysts [11] and photoelectrochemical (PEC) cells. [12] The dispersion of powdered photocatalysts in water is suitable for large-scale processes, while the system requires stirring during the reaction and product separation after the reaction. In comparison, PEC systems (Figure 1a), which combine harvesting solar energy with water reduction into a single device, possesses several advantages. [13] i) PEC reactions address the issue of gas separation by generating products at different electrodes. ii) An external bias supply or self-bias voltage in the PEC system can provide additional energy input to compensate for the potential deficiency, [14] leading to the formation of a surface space charge layer and achieving efficient charge separation and an increased number of long-living photogenerated charges. [15] iii) Moreover, PEC systems can potentially be operated using only stable and abundant materials, such as Cu-based metal oxides, [16] Fe 2 O 3 , [14b,17] and TiO 2. [18] In a typical PEC system, at least one photoelectrode is used as a working electrode to harvest solar radiation, either acting Solar-driven photoelectrochemical (PEC) hydrogen evolution is a promising and sustainable approach to convert solar energy into a fuel that can be stored. Semiconductor quantum dots (QDs) are increasingly used in PEC devices due to their broad composition/size/shape tunable absorption spectrum (from ultraviolet to near-infrared, with significant over...

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Carbon quantum dots modified anatase/rutile TiO2 photoanode with dramatically enhanced photoelectrochemical performance

Cited by 166 publications

References 53 publications

Enhanced Photoelectrochemical Water Splitting on Nickel‐Doped Cobalt Phosphate by Modulating both Charge Transfer and Oxygen Evolution Efficiencies

Enhanced Photoelectrochemical Water Splitting on Nickel‐Doped Cobalt Phosphate by Modulating both Charge Transfer and Oxygen Evolution Efficiencies

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

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