Competitive Hole Transfer from CdSe Quantum Dots to Thiol Ligands in CdSe-Cobaloxime Sensitized NiO Films Used as Photocathodes for H<sub>2</sub> Evolution

Abdellah, Mohamed; Zhang, Shihuai; Wang, Mei; Hammarström, Leif

doi:10.1021/acsenergylett.7b00730

Cited by 37 publications

(35 citation statements)

References 39 publications

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“…[229] Most of the holes were trapped by thiol groups and/or sulfide ions from the capping agent (thioglycolic acid) of CdSe QDs as indicated from the femtosecond TA investigation. [230] Therefore, further treatment of QDs, including using thiol-free capping agents or employing core/shell QDs with short ligands, should be taken into consideration.…”

Section: Electron Transfer Engineeringmentioning

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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Section: Electron Transfer Engineeringmentioning

confidence: 99%

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

Liu

Zhao

Wang

et al. 2021

Advanced Energy Materials

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“…We next considered the possibility that the thiol group could be oxidized under photocatalytic conditions, which would effectively render it an electron donor, as previously reported. 41,42 However, 1 H-NMR spectroscopy of a ZnSe | MEMI solution after 1 h of solar irradiation did not show any signals from a potential disulfide product (Figure S13).…”

Section: Photocatalytic Co2 Reductionmentioning

confidence: 99%

Imidazolium-modification enhances photocatalytic CO₂ reduction on ZnSe quantum dots

et al. 2021

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“…The probe and reference pulses were scattered in a spectrograph and a diode array is used to detect these pulses. The instrumental response time is approximately 100 fs, the polarization of the pump was adjusted at a magic angle of 54.7 • with respect to the probe beam [25][26][27][28]. Low temperature-specific heat and the magnetic properties of the investigated sample were measured by using the Quantum Design Physical Properties Measurement System (PPMS).…”

Section: Characterizationmentioning

confidence: 99%

Synthesis, Optical, Magnetic and Thermodynamic Properties of Rocksalt Li1.3Nb0.3Mn0.4O2 Cathode Material for Li-Ion Batteries

et al. 2021

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Since the discovery of the reversible intercalation of lithium-ion materials associated with promising electrochemical properties, lithium-containing materials have attracted attention in the research and development of effective cathode materials for lithium-ion batteries. Despite various studies on synthesis, and electrochemical properties of lithium-based materials, fairly little fundamental optical and thermodynamic studies are available in the literature. Here, we report on the structure, optical, magnetic, and thermodynamic properties of Li-excess disordered rocksalt, Li1.3Nb0.3Mn0.4O2 (LNMO) which was comprehensively studied using powder X-ray diffraction, transient absorption spectroscopy, magnetic susceptibility, and low-temperature heat capacity measurements. Charge carrier dynamics and electron–phonon coupling in LNMO were studied using ultra-fast laser spectroscopy. Magnetic susceptibility and specific heat data are consistent with the onset of long-range antiferromagnetic order at the Néel temperatures of 6.5 (1.5) K. The effective magnetic moment of LNMO is found to be 3.60 μB. The temperature dependence of the inverse magnetic susceptibility follows the Curie–Weiss law in the high-temperature region and shows negative values of the Weiss temperature 52 K (3), confirming the strong AFM interactions.

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Competitive Hole Transfer from CdSe Quantum Dots to Thiol Ligands in CdSe-Cobaloxime Sensitized NiO Films Used as Photocathodes for H₂ Evolution

Cited by 37 publications

References 39 publications

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

Imidazolium-modification enhances photocatalytic CO₂ reduction on ZnSe quantum dots

Synthesis, Optical, Magnetic and Thermodynamic Properties of Rocksalt Li1.3Nb0.3Mn0.4O2 Cathode Material for Li-Ion Batteries

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Competitive Hole Transfer from CdSe Quantum Dots to Thiol Ligands in CdSe-Cobaloxime Sensitized NiO Films Used as Photocathodes for H2 Evolution

Cited by 37 publications

References 39 publications

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

Quantum Dots‐Based Photoelectrochemical Hydrogen Evolution from Water Splitting

Imidazolium-modification enhances photocatalytic CO2 reduction on ZnSe quantum dots

Synthesis, Optical, Magnetic and Thermodynamic Properties of Rocksalt Li1.3Nb0.3Mn0.4O2 Cathode Material for Li-Ion Batteries

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Competitive Hole Transfer from CdSe Quantum Dots to Thiol Ligands in CdSe-Cobaloxime Sensitized NiO Films Used as Photocathodes for H₂ Evolution

Imidazolium-modification enhances photocatalytic CO₂ reduction on ZnSe quantum dots