scholarly journals Boosting photoelectrochemical efficiency by near-infrared-active lattice-matched morphological heterojunctions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guo-Qiang Liu ◽  
Yuan Yang ◽  
Yi Li ◽  
Taotao Zhuang ◽  
Xu-Feng Li ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Near Infrared ◽  
Light Harvesting ◽  
Separation Efficiency ◽  
Energy Conversion Efficiency ◽  
Infrared Region ◽  
Carrier Recombination ◽  
Solar Conversion ◽  
Conversion Efficiencies ◽  
Lattice Matched

AbstractPhotoelectrochemical catalysis is an attractive way to provide direct hydrogen production from solar energy. However, solar conversion efficiencies are hindered by the fact that light harvesting has so far been of limited efficiency in the near-infrared region as compared to that in the visible and ultraviolet regions. Here we introduce near-infrared-active photoanodes that feature lattice-matched morphological hetero-nanostructures, a strategy that improves energy conversion efficiency by increasing light-harvesting spectral range and charge separation efficiency simultaneously. Specifically, we demonstrate a near-infrared-active morphological heterojunction comprised of BiSeTe ternary alloy nanotubes and ultrathin nanosheets. The heterojunction’s hierarchical nanostructure separates charges at the lattice-matched interface of the two morphological components, preventing further carrier recombination. As a result, the photoanodes achieve an incident photon-to-current conversion efficiency of 36% at 800 nm in an electrolyte solution containing hole scavengers without a co-catalyst.

Integration of Combined Cycle Power Plants and Parabolic Solar Troughs Using CO2 as Heat Transfer Fluid

2010 ◽  
Author(s):  
Giorgio Cau ◽  
Daniele Cocco ◽  
Pamela Concas ◽  
Vittorio Tola
Keyword(s):  
Heat Transfer ◽  
Performance Assessment ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Combined Cycle ◽  
Heat Transfer Fluid ◽  
Maximum Temperature ◽  
Solar Conversion ◽  
Solar Energy Conversion Efficiency ◽  
Conversion Efficiencies

In this paper, a performance assessment of integrated solar combined cycle systems (ISCCS) is reported on. The main aim of the study was to evaluate the solar conversion efficiency of ISCCS plants based on parabolic troughs using CO2 as heat transfer fluid. The use of CO2 instead of the more conventional thermal oil as heat transfer fluid can allow an increase in the trough outlet temperature and thus in solar energy conversion efficiency. In particular, the ISCCS plant considered here was developed on the basis of a triple-pressure, reheated combined cycle power plant rated at 252 MW. Two different solutions for the solar steam generator are considered and compared. Moreover, the performance of the ISCCS system was evaluated with reference to different values of CO2 maximum temperature, solar radiation and solar share of the power output. The results of the performance assessment show that the solar energy conversion efficiency ranges from 23% to 25% for a CO2 maximum temperature of 550°C. The use of a CO2 temperature of 450°C reduces the solar efficiency by about 1.5–2.0 percentage points. The use of a solar steam generator including only the evaporation section instead of the preheating, evaporation and superheating sections allows the achievement of slightly better conversion efficiencies. However, the adoption of this solution leads to a maximum value of the solar share around 10% on the ISCCS power output. The solar conversion efficiencies of the ISCCS systems considered here are better than those of the more conventional Concentrating Solar Power (CSP) systems based on steam cycles (14–18%) and are very similar to the predicted conversion efficiencies of the more advanced direct steam generation plants (22–27%).

scholarly journals A narrow-bandgap benzobisthiadiazole derivative with high near-infrared photothermal conversion efficiency and robust photostability for cancer therapy

2015 ◽  
Vol 51 (20) ◽  
pp. 4223-4226 ◽  
Author(s):  
Shuo Huang ◽  
Ravi Kumar Kannadorai ◽  
Yuan Chen ◽  
Quan Liu ◽  
Mingfeng Wang
Keyword(s):  
Cancer Therapy ◽  
Cancer Cells ◽  
Conversion Efficiency ◽  
Near Infrared ◽  
Therapeutic Agent ◽  
Infrared Region ◽  
Strong Absorption ◽  
Agent Based ◽  
Narrow Bandgap ◽  
Near Infrared Region

A novel photothermal therapeutic agent based on a narrow-bandgap benzobisthiadiazole derivative shows strong absorption in the near-infrared region, high photothermal efficiency and robust photostability for treatment of cancer cells.

scholarly journals Analysis and optimal design of a vibration isolation system combined with electromagnetic energy harvester

2019 ◽  
Vol 30 (16) ◽  
pp. 2382-2395
Author(s):  
Uchenna Diala ◽  
SM Mahdi Mofidian ◽  
Zi-Qiang Lang ◽  
Hamzeh Bardaweel
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Vibration Isolation ◽  
Energy Conversion Efficiency ◽  
Isolation System ◽  
Magnetic Components ◽  
Energy Harvesting System ◽  
Response Function Method ◽  
Conversion Efficiencies

This work investigates a vibration isolation energy harvesting system and studies its design to achieve an optimal performance. The system uses a combination of elastic and magnetic components to facilitate its dual functionality. A prototype of the vibration isolation energy harvesting device is fabricated and examined experimentally. A mathematical model is developed using first principle and analyzed using the output frequency response function method. Results from model analysis show an excellent agreement with experiment. Since any vibration isolation energy harvesting system is required to perform two functions simultaneously, optimization of the system is carried out to maximize energy conversion efficiency without jeopardizing the system’s vibration isolation performance. To the knowledge of the authors, this work is the first effort to tackle the issue of simultaneous vibration isolation energy harvesting using an analytical approach. Explicit analytical relationships describing the vibration isolation energy harvesting system transmissibility and energy conversion efficiency are developed. Results exhibit a maximum attainable energy conversion efficiency in the order of 1%. Results suggest that for low acceleration levels, lower damping values are favorable and yield higher conversion efficiencies and improved vibration isolation characteristics. At higher acceleration, there is a trade-off where lower damping values worsen vibration isolation but yield higher conversion efficiencies.

scholarly journals Enhanced Solar Photoelectrochemical Conversion Efficiency of ZnO:Cu Electrodes for Water-Splitting Application

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Rekha Dom ◽  
Lijin Rose Baby ◽  
Hyun Gyu Kim ◽  
Pramod H. Borse
Keyword(s):  
Conversion Efficiency ◽  
Zno Films ◽  
Photoelectrochemical Performance ◽  
Cu Doping ◽  
Energy Applications ◽  
Spray Pyrolysis Deposition ◽  
Solar Conversion ◽  
Doped Zno ◽  
Conversion Efficiencies ◽  
Solar Conversion Efficiency

n-typeZnO:Cu photoanodes were fabricated by simple spray pyrolysis deposition technique. Influence of low concentration (range ~10−4–10−1%) of Cu doping in hexagonal ZnO lattice on its photoelectrochemical performance has been investigated. The doped photoanodes displayed 7-time enhanced conversion efficiencies with respect to their undoped counterpart, as estimated from the photocurrents generated under simulated solar radiation. This is the highest enhancement in the solar conversion efficiency reported so far for the Cu-doped ZnO. This performance is attributed to the red shift in the band gap of the Cu-doped films and is in accordance with the incident-photon-current-conversion efficiency (IPCE) measurements. Electrochemical studies reveal ann-typenature of these photoanodes. Thus, the study indicates a high potential of doped ZnO films for solar energy applications, in purview of the development of simple nanostructuring methodologies.

Near-infrared absorbing porphyrin dyes with perpendicularly extended π-conjugation for dye-sensitized solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 50897-50905 ◽  
Author(s):  
Wenhui Li ◽  
Zonghao Liu ◽  
Xiaobao Xu ◽  
Yi-Bing Cheng ◽  
Zhixin Zhao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Near Infrared ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Two new near-infrared porphyrins exhibited energy conversion efficiency of 7.21% in dye-sensitized solar cells.

scholarly journals Laser generated gold nanocorals with broadband plasmon absorption for photothermal applications

Nanoscale ◽  
2015 ◽  
Vol 7 (32) ◽  
pp. 13702-13714 ◽  
Author(s):  
Annamaria Poletti ◽  
Giulio Fracasso ◽  
Giamaica Conti ◽  
Roberto Pilot ◽  
Vincenzo Amendola
Keyword(s):  
Surface Chemistry ◽  
Laser Irradiation ◽  
Conversion Efficiency ◽  
Self Assembly ◽  
Near Infrared ◽  
Infrared Region ◽  
Green Method ◽  
Plasmon Absorption ◽  
Near Infrared Region

Gold nanocorals (AuNC) are obtained by a “green” method consisting of laser irradiation, followed by anisotropic self-assembly without templating agents. The AuNC dispersion has broadband plasmon absorption from the visible to near infrared region, unitary light-to-heat conversion efficiency, versatile surface chemistry and biocompatibility.

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