scholarly journals PHOTODEGRADATION EFFECT ON OPTICAL PROPERTIES OF MANGOSTEEN PERICARP, BLACK GRAPE PEEL AND VIOLET BOUGAINVILLEA FLOWERS AS PHOTOSENSITIZER FOR SOLAR CELL APPLICATION

2021 ◽  
Vol 83 (5) ◽  
pp. 109-117
Author(s):  
Nurul Alfatihah Mohd Arifin ◽  
Hasiah Salleh ◽  
Ahmad Nazri Dagang ◽  
Nik Aziz Nik Ali ◽  
Nur Salihah Alias ◽  
...  
Keyword(s):  
Solar Cell ◽  
Chlorophyll A ◽  
Alternative Energy ◽  
Green Energy ◽  
Natural Dyes ◽  
Hybrid Solar Cells ◽  
Solar Cell Application ◽  
Alternative Energy Sources ◽  
Vis Spectroscopy ◽  
Grape Peel

Alternative energy sources such as wind, solar, biomass, hydro, and geothermal have become imperative for green energy solutions. A growing demand of hybrid solar cells is yet another promising option toward green energy providing the opportunity to explore natural dye extracts from the plant. The natural dyes were extracted from mangosteen pericarp (MP), black grape peel (BGP), and violet bougainvillea flowers (VBF), respectively. The natural dyes were then undergoing degradation under exposure to the light for six weeks. UV-vis spectroscopy was used to characterize the optical absorption of the natural dyes. UV-vis result showed that MP absorbs three ranges of light, 400-600 nm (chlorophyll a), 530- 550 nm (anthocyanin), and 650-670 nm (chlorophyll a). After 6 weeks, MP gives the best in sustaining itself by having the lowest percentage of photodegradation (50.73 %) compare to BGP (83.88%) and VBF (65.66%). The natural dyes gave the FTIR vibration peaks of OH, C-H, C=O, and C-O-C functional groups. Therefore, this study provides significant contributes towards explaining the potential of MP as the promising photosensitizer in the development of the hybrid solar cell.

scholarly journals The use of low grade bio ethanol as fuel mixer in gasoline engine with optimization compact distillator

2018 ◽  
Vol 67 ◽  
pp. 02004
Author(s):  
Iqbal Yamin ◽  
Bambang Sugiarto ◽  
Setia Abikusna ◽  
Dedi Suntoro
Keyword(s):  
Alternative Energy ◽  
Gas Flow ◽  
Gasoline Engine ◽  
Ethanol Vapor ◽  
Energy Development ◽  
Green Energy ◽  
Low Grade ◽  
Exhaust Gas ◽  
High Grade ◽  
Alternative Energy Sources

Limited fossil energy resources need to encourage renewable energy development and energy conservation it is called green energy development. One of the alternative energy sources used are bioethanol, from low grade is converted into high grade through distillation process with distillator compact that will be used as a mixture of gasoline. Tests compact distillator consisting of evaporator Indonesia Kampus, separator, and condenser by utilizing exhaust gas to heat distillator already filled with low grade bioethanol, so the heat transfer occurs on the surface of the exhaust into the evaporator chamber. In the evaporator will transform ethanol into the vapor phase. Ethanol vapor flows into the separator, with a mechanism in it is expected that water vapor will evaporate participate separately with ethanol vapor. Ethanol vapors from this distillation will flow to the condenser and will be turned into liquid, the liquid is as high grade bioethanol would be the fuel mixing gasoline. In early studies, distillation rate was 98.5 ml/h with 67% ethanol content. Optimization compact distillator is done by adding the valve at the evaporator branch. When heat has reached 80°C exhaust gas flow to the evaporator chamber is closed. As a result, the heat from the evaporator can be detained and not rise significantly. Further optimization is to change the design of the separator through theoretical and empirical calculations with some assumptions based on the rule of thumb in the field of distillation, adding insulation to reduce heat leakage, as well as varying the feed volume and feed concentrate ethanol. In the end, based on the parameters of the distillation rate and ethanol concentrate, compact distillator with distances between tray 100 mm, volume 800 ml, engine speed 5.400 rpm can produce distillation rate of 274.3 ml/hr and ethanol concentrate of 88.97%.

Nanotechnology for biomedical applications - enhancement of photodynamic activity by nanomaterials

2011 ◽  
Vol 59 (3) ◽  
pp. 253-261 ◽  
Author(s):  
A. Ulatowska-Jarża ◽  
J. Pucińska ◽  
K. Wysocka-Król ◽  
I. Hołowacz ◽  
H. Podbielska
Keyword(s):  
Biomedical Applications ◽  
Alternative Energy ◽  
Fluorescence Enhancement ◽  
Molecular Level ◽  
Protoporphyrin Ix ◽  
Alternative Energy Sources ◽  
Vis Spectroscopy ◽  
Photodynamic Activity ◽  
Characteristic Features ◽  
Doped Nanomaterials

Nanotechnology for biomedical applications - enhancement of photodynamic activity by nanomaterialsOver the last two decades nanotechnology has become one of the most dynamically evolving field of research. The unique properties of nanomaterials, not disclosing at microscale, are examined and exploited to extend our understanding of the interactions taking place at atomic or molecular level. Those findings affect research in many areas, like e.g. alternative energy sources, electronics, physics and medicine. In this paper, the possibility of using nanomaterials for the enhancement of photodynamic activity, is discussed. A brief review on drug-delivery facilitating nanomaterials, regarding their characteristic features, is presented. An exemplary application of silver-doped nanomaterials for enhancement of photodynamic properties of two photosensitizers: Photolon and Protoporphyrin IX, is described. Influence of silver-doped nanomaterials addition on the fluorescence intensity of photosensitizers immobilized in silica-titania (SiO2-TiO2) sol was examined via VIS spectroscopy. Influence of sonication on the fluorescence enhancement was also investigated. It was demonstrated that the fluorescence enhancement of photosensitizers depends on the concentration of both: photosensitizer and silver-doped nanoparticles.

scholarly journals Fabrication and Study of Structural, Optical Features of Nano Structured, Photo-Harvesting Organo-Lead Halide-Based Perovskite Solar Cell

2018 ◽  
Author(s):  
Abhishek Dhar ◽  
Rohit L. Vekariya ◽  
Argha Dey ◽  
Subhasis Roy
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Alternative Energy ◽  
Large Scale ◽  
Energy Conversion Efficiency ◽  
Lead Chloride ◽  
Systematic Analysis ◽  
Alternative Energy Sources ◽  
Perovskite Material ◽  
Co Precipitation

In a world where conventional sources of energy are fast depleting, the quest for alternative energy sources may hold the key for the survival of humanity. In the present work, emphasis has been given to the idea of producing energy from perovskite based solar cells. In order to bring this idea into fruition, a unique and novel nano structured perovskite material n-propyl ammonium lead chloride (C3H7NH3+PbCl3⁻) was prepared through a unique co-precipitation route using n-propyl amine (n-C3H7NH2) and hydrochloric acid as the starting precursors with aqueous solution of Pb(CH3COO)23H2O. Finally acetic acid was added to the solution and this solution was allowed to concentrate and then gradually cooled down to room temperature. After math, the synthesized material was spin-coated on TiO2 film to fabricate the solar cell. The device was then undergone systematic analysis using XRD, SEM, UV and Photo Conversion to get a transparent idea regarding its structural, electrical and optical properties. When experimentally applied, this perovskite-based solar cell has shown energy conversion efficiency (η) of around 6.01 % which is noticeably good. Thus it can be concluded that this material is promising for fabrication of vastly efficient solar cells. This technology can be tried in large scale as an alternative of conventional energy in the near future.

scholarly journals An experimental and DFT study on novel dyes incorporated with natural dyes on titanium dioxide (TiO2) towards solar cell application

2020 ◽  
Vol 126 (9) ◽  
Author(s):  
Muhammad Kashif ◽  
Zainab Ngaini ◽  
Angelina Viviana Harry ◽  
Rohit L. Vekariya ◽  
Awais Ahmad ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Solar Cell ◽  
Natural Dyes ◽  
Dft Study ◽  
Solar Cell Application

scholarly journals Economic viability and profitability assessments of WECS

2020 ◽  
Vol 10 (2) ◽  
pp. 1220
Author(s):  
Mohammed Kdair Abd
Keyword(s):  
Wind Energy ◽  
Alternative Energy ◽  
Power Plants ◽  
Electrical Energy ◽  
Green Energy ◽  
Energy Prices ◽  
Wind Energy Conversion ◽  
Alternative Energy Sources ◽  
Technological Advances ◽  
Alternative Sources

Technical and technological advances in alternative energy sources have led many countries to add green energy to their power plants to reduce carbon emissions and air pollution. At present, many electricity companies are looking to use alternative sources of energy because of high electrical energy prices. Wind energy is more useful than many renewable energies such as solar, heat, biomass, etc. The Wind Energy Conversion System (WECS) is a system that converts the kinetic energy of the wind into electrical energy to feed the known loads. WECS can be found in a variety of technology. Climate change and load demand are essential determinants of WECS optimization modelling. In this paper, proposed a strategy focused primarily on economic analysis WECS. The strategy based on a weather change to find the optimal designing and modelling for four different types of WECS using HOMER software. Finally, several criteria were used to determine which type of WECS was the most profitable investment and less payback period.

Switching to Clean Energy: A Milestone for Energy Security and Economic Advantage for Nepal

2018 ◽  
Vol 1 (1) ◽  
pp. 20-23
Author(s):  
Chet Narayan Acharya
Keyword(s):  
Energy Security ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
Green Energy ◽  
Energy Utilization ◽  
Living Standard ◽  
Energy Sources ◽  
Alternative Energy Sources ◽  
Development Agenda

With the world-wide wave of economic development and improved traditional living standard of people, consumption of fuel has also increased significantly. Exponential growth in use of fossil fuel and its impacts compelled to search for alternative energy sources. Green energy is that source of energy that is naturally restocked. Nepal is rich enough country for renewable energy sources even though, could not accelerate growth and development agenda.  Appropriate policy and planning of green energy would help to give a big push to break development hazards and would contribute for economic freedom and energy security.  This paper attempts to scrutinize and understand the green energy utilization, proper management and exploring the capacity of the Nepalese economy.

PROSPECTS FOR THE FOURTH INDUSTRIAL REVOLUTION IN CONTEXT OF GLOBAL ENERGY SECURITY

2020 ◽  
Vol 1 (9) ◽  
pp. 17-25
Author(s):  
V. D. POTURUKHIN ◽  
Keyword(s):  
Alternative Energy ◽  
Industrial Revolution ◽  
Energy Resource ◽  
Green Energy ◽  
Energy Sources ◽  
Resource Base ◽  
Alternative Energy Sources ◽  
Production Cycles ◽  
Industrial Revolutions

The article consider the role of energy factor in historical process of the first three industrial revolutions. The efficiency of modern alternative energy sources compared with traditional sources is being studied, as well as prospects for "green" energy sources to become a resource base for economic growth and a new technoeconomic paradigm. The potential of the modern energy resource base to provide mass automation of production cycles is being estimated.

scholarly journals Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Alfian F. Madsuha ◽  
Akhmad H. Yuwono ◽  
Nofrijon Sofyan ◽  
Michael Krueger
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Solar Cells ◽  
Solar Cell ◽  
Electron Transport ◽  
Bulk Heterojunction ◽  
Hexanoic Acid ◽  
Cdse Quantum Dots ◽  
Hybrid Solar Cells ◽  
Solar Cell Application

As-synthesized colloidal quantum dots (QDs) are usually covered by an organic capping ligand. These ligands provide colloidal stability by preventing QDs agglomeration. However, their inherent electrical insulation properties deliver a problem for hybrid solar cell application, disrupting charge transfer, and electron transport in conjugated polymer/QDs photoactive blends. Therefore, a surface modification of QDs is crucial before QDs are integrated into solar cell fabrication. In this work, enhancement of power conversion efficiency (PCE) in bulk heterojunction (BHJ) hybrid solar cells based on hexadecylamine- (HDA-) capped CdSe quantum dots (QDs) has been achieved via a postsynthetic hexanoic acid washing treatment. The investigation of the surface modification was performed to find the optimum of washing time and their effect on solar cell devices performance. Variation of washing time between 16 and 30 min has been conducted, and an optimum washing time was found at 22 min, resulting in a high PCE of 2.81%. The efficiency enhancement indicates improved electron transport, contributing in an increased short-circuit current density of solar cell devices.

scholarly journals THE CONDUCTIVITY STUDY OF HYBRID SOLAR CELLS OF TIO2 AND DOPED WITH BIXA ORELLANA FOR SOLAR CELLS APPLICATION

2015 ◽  
Vol 78 (3) ◽  
Author(s):  
Zakiyah Ahmad ◽  
Mohd Sabri Mohd Ghazali ◽  
Hasiah Salleh ◽  
Azmi Zakaria ◽  
Salmah Mohd Ghazali ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance ◽  
Green Technology ◽  
Natural Dyes ◽  
Oxide Semiconductor ◽  
Hybrid Solar Cells ◽  
Bixa Orellana ◽  
Energy Band Gap ◽  
Vis Spectroscopy ◽  
Ito Glass

The application of nature dyes was explored for solar cells due to several advantages for green technology. These can be supporting in renewable energy alternatives, which must include solar energy. This system was fabricated as hybrid solar cells, which consist of organic and non-organic materials. Metal oxide semiconductor (MOS), TiO2, was selected as charge separation and transport. Bixa orellana used as extracted natural dyes solution in order to enhance the absorption of photons. The dyes were extracted by using immerging in methanol solution and left until dyes being extracted. The dyes were coated on ITO glass by using Electrochemical Impedance Spectroscopy (EIS) varied by 1, 3, 5, 7 and 10 layers of scan. This work focuses on conductivity and charge carrier study of thin film. The result shows the conductivity was increase due to several parameters that are, thickness of thin films, and intensity of light, mixture of natural dyes and concentration of dyes solution. The conductivity was then supported with the energy band gap via UV-Vis Spectroscopy.

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