A colloidal heterostructured quantum dot sensitized carbon nanotube–TiO2 hybrid photoanode for high efficiency hydrogen generation

2019 ◽  
Vol 4 (2) ◽  
pp. 404-414 ◽  
Author(s):  
Gurpreet Singh Selopal ◽  
Mahyar Mohammadnezhad ◽  
Fabiola Navarro-Pardo ◽  
François Vidal ◽  
Haiguang Zhao ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Quantum Dot ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Photocurrent Density ◽  
Control Device

A photoelectrochemical device based on a TiO2/QD–MWCNT (0.015 wt%) hybrid photoanode yields 40% higher photocurrent density than the control device.

Nanofiber-supported CuS nanoplatelets as high efficiency counter electrodes for quantum dot-based photoelectrochemical hydrogen production

2017 ◽  
Vol 1 (1) ◽  
pp. 65-72 ◽  
Author(s):  
F. Navarro-Pardo ◽  
L. Jin ◽  
R. Adhikari ◽  
X. Tong ◽  
D. Benetti ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Quantum Dot ◽  
Copper Sulfide ◽  
Counter Electrode ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Polymer Nanofibers ◽  
Counter Electrodes ◽  
Photoelectrochemical Hydrogen Production

A hybrid counter electrode based on copper sulfide/polymer nanofibers was developed for efficient and stable photoelectrochemical hydrogen generation.

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.

Development of Hybrid WO3-TiO2 Nanotubes for Solar Hydrogen Generation via Water Electrolysis

2014 ◽  
Vol 925 ◽  
pp. 474-478
Author(s):  
Chin Wei Lai ◽  
Kung Shiuh Lau
Keyword(s):  
High Efficiency ◽  
Hydrogen Generation ◽  
Rf Sputtering ◽  
Light Response ◽  
Water Electrolysis ◽  
Ammonium Fluoride ◽  
Energy System ◽  
Photocurrent Density ◽  
High Energy ◽  
Solar Hydrogen

Solar hydrogen (H2) generation from water electrolysis is a key target for the development of sustainable hydrogen economy for future energy system. The formation of self-organized and highly ordered titania (TiO2) nanotubes is essential for high efficiency in photoelectrochemical (PEC) water electrolysis application. Based on our preliminary studies, highly ordered TiO2nanotubes were successfully synthesized through anodization of titanium (Ti) foil in ethylene glycol (EG) containing 5 wt% of ammonium fluoride (NH4F) and 5 wt% of hydrogen peroxide (H2O2) at 60 V for 1 h. However, an obvious hindrance to the widespread use of TiO2nanotubes as a photoelectrode in PEC water electrolysis system is its poor visible light response and rapid recombination of photo-induced electron/hole pairs. Thus, continuous efforts have been exerted to improve the efficiency of PEC water electrolysis by incorporating an optimum content of W6+species into TiO2nanotubes. In the present study, a practical technique of radio frequency (RF) sputtering was selected to incorporate W6+species into TiO2lattice. It was found that TiO2nanotubes sputtered at high energy of 50 W for 30 sec demonstrated a maximum photocurrent density of ~ 2.4 mA/cm2with photoconversion efficiency ~ 6 %.

scholarly journals Tailoring the Geometry of Bottom-Up Nanowires: Application to High Efficiency Single Photon Sources

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1201
Author(s):  
Dan Dalacu ◽  
Philip J. Poole ◽  
Robin L. Williams
Keyword(s):  
Quantum Dot ◽  
High Efficiency ◽  
Emission Rate ◽  
Single Photon ◽  
Collection Efficiency ◽  
Photon Emission ◽  
Device Performance ◽  
Bottom Up ◽  
Selective Area ◽  
Photon Generation

For nanowire-based sources of non-classical light, the rate at which photons are generated and the ability to efficiently collect them are determined by the nanowire geometry. Using selective-area vapour-liquid-solid epitaxy, we show how it is possible to control the nanowire geometry and tailor it to optimise device performance. High efficiency single photon generation with negligible multi-photon emission is demonstrated using a quantum dot embedded in a nanowire having a geometry tailored to optimise both collection efficiency and emission rate.

Solar Thermophotovoltaic Converters Based on Tungsten Emitters

2006 ◽  
Vol 129 (3) ◽  
pp. 298-303 ◽  
Author(s):  
V. M. Andreev ◽  
A. S. Vlasov ◽  
V. P. Khvostikov ◽  
O. A. Khvostikova ◽  
P. Y. Gazaryan ◽  
...  
Keyword(s):  
Band Gap ◽  
High Efficiency ◽  
Radiation Spectrum ◽  
Cost Effective ◽  
Fresnel Lens ◽  
Photocurrent Density ◽  
Back Side ◽  
High Concentration ◽  
Emitter System ◽  
Solar Powered

Results of a solar thermophotovoltaic (STPV) system study are reported. Modeling of the STPV module performance and the analysis of various parameters influencing the system are presented. The ways for the STPV system efficiency to increase and their magnitude are considered such as: improvement of the emitter radiation selectivity and application of selective filters for better matching the emitter radiation spectrum and cell photoresponse; application of the cells with a back side reflector for recycling the sub-band gap photons; and development of low-band gap tandem TPV cells for better utilization of the radiation spectrum. Sunlight concentrator and STPV modules were designed, fabricated, and tested under indoor and outdoor conditions. A cost-effective sunlight concentrator with Fresnel lens was developed as a primary concentrator and a secondary quartz meniscus lens ensured the high concentration ratio of ∼4000×, which is necessary for achieving the high efficiency of the concentrator–emitter system owing to trap escaping radiation. Several types of STPV modules have been developed and tested under concentrated sunlight. Photocurrent density of 4.5A∕cm2 was registered in a photoreceiver based on 1×1cm2GaSb cells under a solar powered tungsten emitter.

ZnO nanorods decorated with metal sulfides as stable and efficient counter-electrode materials for high-efficiency quantum dot-sensitized solar cells

2016 ◽  
Vol 4 (21) ◽  
pp. 8161-8171 ◽  
Author(s):  
Chandu V. V. M. Gopi ◽  
Mallineni Venkata-Haritha ◽  
Young-Seok Lee ◽  
Hee-Je Kim
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Counter Electrode ◽  
Electrode Materials ◽  
High Efficiency ◽  
Zno Nanorods ◽  
Metal Sulfide ◽  
Metal Sulfides ◽  
Sensitized Solar Cells

Metal sulfide decorated with ZnO NRs (ZnO/CoS, ZnO/NiS, ZnO/CuS and ZnO/PbS) were fabricated and used as efficient CEs for QDSSCs.

High efficiency CdS quantum-dot-sensitized solar cells with boron and nitrogen co-doped TiO2 nanofilm as effective photoanode

2015 ◽  
Vol 169 ◽  
pp. 103-108 ◽  
Author(s):  
Ling Li ◽  
Junying Xiao ◽  
Xichuan Yang ◽  
Wenming Zhang ◽  
Huayan Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
High Efficiency ◽  
Doped Tio2 ◽  
Cds Quantum Dot ◽  
Sensitized Solar Cells ◽  
Co Doped

Hybrid Single Walled Carbon Nanotube - Quantum Dot photosensors

2015 ◽  
Author(s):  
Simas Rackauskas ◽  
Andrei V. Alaferdov ◽  
Tatiana Rackauskas ◽  
Raluca Savu ◽  
Stanislav A. Moshkalev ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Quantum Dot ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon
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