Carbon Quantum Dot/TiO2 Nanohybrids: Efficient Photocatalysts for Hydrogen Generation via Intimate Contact and Efficient Charge Separation

2019 ◽  
Vol 2 (2) ◽  
pp. 1027-1032 ◽  
Author(s):  
Yulu Zhou ◽  
Sizhuo Yang ◽  
Donghua Fan ◽  
Jake Reilly ◽  
Hongwei Zhang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Intimate Contact ◽  
Carbon Quantum Dot ◽  
Efficient Charge

Carbon quantum dot sensitized integrated Fe2O3@g-C3N4 core–shell nanoarray photoanode towards highly efficient water oxidation

2018 ◽  
Vol 6 (21) ◽  
pp. 9839-9845 ◽  
Author(s):  
Sha-Sha Yi ◽  
Jun-Min Yan ◽  
Qing Jiang
Keyword(s):  
Quantum Dot ◽  
Water Oxidation ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Carbon Quantum Dot ◽  
Efficient Charge ◽  
Oxidation Performance ◽  
Charge Separation Efficiency

The carbon quantum dot (CQD) sensitized integrated Ti:Fe2O3@g-C3N4 core–shell nanoarrays demonstrate superior PEC water oxidation performance which can be ascribed to efficient charge separation efficiency derived from the well-confined heterojunction structure together with the high catalytic activity of the CQDs for H2O2 decomposition.

Water Electrolysis with a Conducting Carbon Cloth: Subthreshold Hydrogen Generation and Superthreshold Carbon Quantum Dot Formation

ChemSusChem ◽  
2014 ◽  
Vol 7 (3) ◽  
pp. 883-889 ◽  
Author(s):  
Mandakini Biswal ◽  
Aparna Deshpande ◽  
Sarika Kelkar ◽  
Satishchandra Ogale
Keyword(s):  
Quantum Dot ◽  
Hydrogen Generation ◽  
Water Electrolysis ◽  
Carbon Cloth ◽  
Carbon Quantum Dot

Carbon quantum dot sensitized TiO2 nanotube arrays for photoelectrochemical hydrogen generation under visible light

Nanoscale ◽  
2013 ◽  
Vol 5 (6) ◽  
pp. 2274 ◽  
Author(s):  
Xing Zhang ◽  
Fang Wang ◽  
Hui Huang ◽  
Haitao Li ◽  
Xiao Han ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Visible Light ◽  
Hydrogen Generation ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Carbon Quantum Dot

Insights into the efficient charge separation and transfer efficiency of La,Cr-codoped SrTiO3 modified with CoP as a noble-metal-free co-catalyst for superior visible-light driven photocatalytic hydrogen generation

2018 ◽  
Vol 5 (3) ◽  
pp. 679-686 ◽  
Author(s):  
Pengfei Tan ◽  
Anquan Zhu ◽  
Yi Liu ◽  
Yongjin Ma ◽  
Wenwen Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Transfer Efficiency ◽  
Co Catalyst ◽  
Metal Free ◽  
Photocatalytic Hydrogen Generation ◽  
Efficient Charge ◽  
Visible Light Driven

Doped SrTiO3 modified with CoP as a co-catalyst for photocatalytic H2 evolution was designed and fabricated in this work.

scholarly journals Consecutive Junction-Induced Efficient Charge Separation Mechanisms for High-Performance MoS2/Quantum Dot Phototransistors

2018 ◽  
Vol 10 (44) ◽  
pp. 38264-38271 ◽  
Author(s):  
Sangyeon Pak ◽  
Yuljae Cho ◽  
John Hong ◽  
Juwon Lee ◽  
Sanghyo Lee ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Charge Separation ◽  
High Performance ◽  
Separation Mechanisms ◽  
Efficient Charge

Charge transport effect and photovoltaic conversion of two-dimensional CdSeS quantum dot monolayers in inverted polymer solar cells

2019 ◽  
Vol 7 (38) ◽  
pp. 11797-11805 ◽  
Author(s):  
Guh-Hwan Lim ◽  
Kyu Seung Lee ◽  
Young Jae Park ◽  
Jaeho Shim ◽  
Jin Woo Choi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Charge Transport ◽  
Charge Separation ◽  
Polymer Solar Cells ◽  
Two Dimensional ◽  
Photovoltaic Conversion ◽  
Transport Effect ◽  
Efficient Charge ◽  
Inverted Polymer Solar Cells

Herein, we demonstrate that two-dimensional (2D) CdSeS quantum dot monolayers (QDM) can strongly influence efficient charge transport and charge separation, improving the performance of inverted polymer solar cells (iPSCs).

scholarly journals Semiconductor quantum dot-sensitized rainbow photocathode for effective photoelectrochemical hydrogen generation

2017 ◽  
Vol 114 (43) ◽  
pp. 11297-11302 ◽  
Author(s):  
Hongjin Lv ◽  
Congcong Wang ◽  
Guocan Li ◽  
Rebeckah Burke ◽  
Todd D. Krauss ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Present Report ◽  
Photocurrent Density ◽  
Light Illumination ◽  
Faradaic Efficiency ◽  
Coating Method

The present study reports the fabrication of CdSe quantum dot (QD)-sensitized photocathodes on NiO-coated indium tin oxide (ITO) electrodes and their H2-generating ability upon light irradiation. A well-established spin-coating method was used to deposit CdSe QD stock solution onto the surface of NiO/ITO electrodes, thereby leading to the construction of various CdSe QD-sensitized photocathodes. The present report includes the construction of rainbow photocathodes by spin-coating different-sized QDs in a sequentially layered manner, thereby creating an energetically favorable gradient for charge separation. The resulting rainbow photocathodes with forward energetic gradient for charge separation and subsequent electron transfer to a solution-based hydrogen-evolving catalyst (HEC) exhibit good light-harvesting ability and enhanced photoresponses compared with the reverse rainbow photocathodes under white LED light illumination. Under minimally optimized conditions, a photocurrent density of as high as 115 μA⋅cm−2 and a Faradaic efficiency of 99.5% are achieved, which is among the most effective QD-based photocathode water-splitting systems.

scholarly journals Effects of co-adsorption on interfacial charge transfer in a quantum dot@dye composite

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Peng Cui ◽  
Yuan Xue
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Quantum Dot ◽  
Charge Separation ◽  
Density Functional ◽  
Co Adsorption ◽  
Hole Transfer ◽  
Interfacial Charge Transfer ◽  
Efficient Charge ◽  
Interfacial Charge

AbstractThe sensitive electronic environment at the quantum dot (QD)–dye interface becomes a roadblock to enhancing the energy conversion efficiency of dye-functionalized quantum dots (QDs). Energy alignments and electronic couplings are the critical factors governing the directions and rates of different charge transfer pathways at the interface, which are tunable by changing the specific linkage groups that connect a dye to the QD surface. The variation of specific anchors changes the binding configurations of a dye on the QD surface. In addition, the presence of a co-adsorbent changes the dipole–dipole and electronic interactions between a QD and a dye, resulting in different electronic environments at the interface. In the present work, we performed density functional theory (DFT)-based calculations to study the different binding configurations of N719 dye on the surface of a Cd33Se33 QD with a co-adsorbent D131 dye. The results revealed that the electronic couplings for electron transfer were greater than for hole transfer when the structure involved isocyanate groups as anchors. Such strong electronic couplings significantly stabilize the occupied states of the dye, pushing them deep inside the valence band of the QD and making hole transfer in these structures thermodynamically unfavourable. When carboxylates were involved as anchors, the electronic couplings for hole transfer were comparable to electron transfer, implying efficient charge separation at the QD–dye interface and reduced electron–hole recombination within the QD. We also found that the electronic couplings for electron transfer were larger than those for back electron transfer, suggesting efficient charge separation in photoexcited QDs. Overall, the current computational study reveals some fundamental aspects of the relationship between the interfacial charge transfer for QD@dye composites and their morphologies which benefit the design of QD-based nanomaterials for photovoltaic applications.

scholarly journals Triple Planar Heterojunction of SnO2/WO3/BiVO4 with Enhanced Photoelectrochemical Performance under Front Illumination

2018 ◽  
Vol 8 (10) ◽  
pp. 1765 ◽  
Author(s):  
Swetha Bhat ◽  
Sol Lee ◽  
Jun Suh ◽  
Seung-Pyo Hong ◽  
Ho Jang
Keyword(s):  
Charge Separation ◽  
Back Side ◽  
Front Side ◽  
New Paradigm ◽  
Photoelectrochemical Performance ◽  
Hydrogen Electrode ◽  
Intimate Contact ◽  
Efficient Charge ◽  
Planar Heterojunction ◽  
Side Illumination

The performance of a BiVO4 photoanode is limited by poor charge transport, especially under front side illumination. Heterojunction of different metal oxides with staggered band configuration is a promising route, as it facilitates charge separation/transport and thereby improves photoactivity. We report a ternary planar heterojunction photoanode with enhanced photoactivity under front side illumination. SnO2/WO3/BiVO4 films were fabricated through electron beam deposition and subsequent wet chemical method. Remarkably high external quantum efficiency of ~80% during back side and ~90% upon front side illumination at a wavelength of 400 nm has been witnessed for SnO2/WO3/BiVO4 at 1.23 V vs. reversible hydrogen electrode (RHE). The intimate contact between the heterojunction films enabled efficient charge separation at the interface and promoted electron transport. This work provides a new paradigm for designing triple heterojunction to improve photoactivity, particularly under front illumination, which would be beneficial for the development of tandem devices.

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