scholarly journals Stability of neutral molecular polynitrogens: energy content and decomposition mechanisms

RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21567-21578
Author(s):  
A. C. R. Gomes ◽  
M. X. Silva ◽  
B. R. L. Galvão
Keyword(s):  
Energy Content ◽  
Green Energy ◽  
Energy Sources ◽  
Unimolecular Decomposition ◽  
Decomposition Mechanisms ◽  
The Stability

All-nitrogen molecules may provide green energy sources, releasing large amounts of energy without polluting byproducts. Here we predict the stability towards unimolecular decomposition of several structures and discuss their unusual chemistry.

scholarly journals Towards the Hydrogen Economy—A Review of the Parameters That Influence the Efficiency of Alkaline Water Electrolyzers

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3193
Author(s):  
Ana L. Santos ◽  
Maria-João Cebola ◽  
Diogo M. F. Santos
Keyword(s):  
Energy Content ◽  
Water Electrolysis ◽  
High Energy ◽  
Operating Conditions ◽  
Energy Sources ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
New Energy ◽  
Recent Developments ◽  
Cell Components

Environmental issues make the quest for better and cleaner energy sources a priority. Worldwide, researchers and companies are continuously working on this matter, taking one of two approaches: either finding new energy sources or improving the efficiency of existing ones. Hydrogen is a well-known energy carrier due to its high energy content, but a somewhat elusive one for being a gas with low molecular weight. This review examines the current electrolysis processes for obtaining hydrogen, with an emphasis on alkaline water electrolysis. This process is far from being new, but research shows that there is still plenty of room for improvement. The efficiency of an electrolyzer mainly relates to the overpotential and resistances in the cell. This work shows that the path to better electrolyzer efficiency is through the optimization of the cell components and operating conditions. Following a brief introduction to the thermodynamics and kinetics of water electrolysis, the most recent developments on several parameters (e.g., electrocatalysts, electrolyte composition, separator, interelectrode distance) are highlighted.

Sonication and light irradiation as green energy sources simultaneously implemented in the synthesis of Pd-Fe- and Pt-Fe- doped TiO2-based photocatalysts

2016 ◽  
Vol 425 ◽  
pp. 1-9 ◽  
Author(s):  
Agnieszka Magdziarz ◽  
Juan C. Colmenares ◽  
Olga Chernyayeva ◽  
Dariusz Łomot ◽  
Kamil Sobczak
Keyword(s):  
Green Energy ◽  
Light Irradiation ◽  
Energy Sources ◽  
Doped Tio2

Energy transition demand will elevate aluminium prices

2021 ◽  
Keyword(s):  
Supply Chain ◽  
Middle East ◽  
High Power ◽  
Energy Transition ◽  
Green Energy ◽  
Power Markets ◽  
Energy Sources ◽  
Content Type

Significance Aluminium smelters are being hampered by high power prices and shortages amid the switch towards green energy sources. China has been forced to start importing aluminium at record levels to tackle domestic shortages. Impacts The green energy transition will strain power markets, increasing the challenge of producing energy-intensive aluminium. Supply will gradually diversify as outputs stagnates in China but looks set to rise in Argentina, Brazil, the Middle East and Russia. Consumers and governments in importing nations will increase aluminium recovery and recycling to cut pressure on the supply chain.

scholarly journals Design of Digitally Controlled DC-DC Boost Converter for the Operation in DC Microgrid

2020 ◽  
Vol 7 (2) ◽  
pp. E7-E13
Author(s):  
T. K. Barui ◽  
S. Goswami ◽  
D. Mondal
Keyword(s):  
Renewable Energy Sources ◽  
Boost Converter ◽  
Green Energy ◽  
Energy Sources ◽  
Dc Microgrid ◽  
Efficient System ◽  
Power Sources ◽  
Voltage Range ◽  
Ac Power ◽  
Digitally Controlled

Renewable energy sources (RESs) are becoming increasingly important day by day to tranquilize the world’s energy crisis and consume fossil fuels in the lower rung. A microgrid system that assimilates clean and green energy-based sources such as solar, wind, and biogas is acquiring much prominence over the conventional grid-based power systems in this day and age. For the up and running of the inexhaustible energy sources in the AC power network, numerous conversions of the power sources occur. In the process of conversion, some amount of power is lost, which minimizes conversion efficiency. However, with the increasing use of DC loads and Distributed Energy Resources (DERs), DC Microgrid could be more beneficial than the conventional AC power system by avoiding several types of drawbacks. This paper demonstrates an efficient system of digitally controlled boost converter for the parallel operation in DC microgrid. Here, the converter of 2.5kW 400V is designed and implemented to validate its functioning in a Microgrid. The whole system has been simulated in MATLAB with an input voltage range of 220–380 V. It has been found that the designed converter can maintain the desired output voltage in the DC Busbar at and around 400 V. Finally, some simulation results have been presented to analyze the converter’s operational characteristics and effectiveness in the practical domain.

Towards Smart Green Cities: Analysis of Integrated Renewable Energy Use in Smart Cities

2021 ◽  
Author(s):  
Natalia Vukovic ◽  
Ulyana Koriugina ◽  
Daria Illarionova ◽  
Daria Pankratova ◽  
Polina Kiseleva ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Renewable Energy ◽  
Energy Use ◽  
Smart Cities ◽  
Renewable Energy Sources ◽  
Green Energy ◽  
Energy Sources ◽  
Research Findings ◽  
Effective Development ◽  
Green Cities

This study aims to estimate and explore the experience of introducing renewable energy use in the context of the world’s smart cities. In this regard, the study points out that the use of green energy is an important part of sustainable development. Environmental problems are a matter of global concern. Hence sustainable development is one of the approaches to end the harmful anthropogenic impact. The work includes quantitative assessment methods, for example, statistics, quantitative analysis, analogy, and synthesis. As a result, the analysis confirms that the effective development of a smart green city is impossible without the introduction of several renewable energy sources, the integrated use of which will reduce the likelihood of problems with the city’s energy supply. Likewise, the outcome accentuates that the desire to fully switch to renewable energy sources (RES) can be accompanied by several problems as the creation of RES technologies does not always take the risk of abnormal situations into account. In conclusion, the research findings are recommended to be taken into consideration by researchers in the field of smart and sustainable cities development, as well as urbanists and economists for designing future smart green cities based on renewable energy sources.

Comparative Analysis of MCDM Methods for the Evaluation of Optimum Green Energy Sources

2021 ◽  
pp. 231-262
Author(s):  
Chiranjib Bhowmik ◽  
Sreerupa Dhar ◽  
Amitava Ray
Keyword(s):  
Green Energy ◽  
Energy Sources ◽  
Illustrative Case ◽  
Project Investment ◽  
Implementation Period ◽  
Sustainable Planning ◽  
Useful Life ◽  
Illustrative Case Study ◽  
Future Project

The aim of this article is to select the optimum green energy sources for sustainable planning from a given set of energy alternatives. This study examines the combined behavior of multi-criteria decision-making approaches-TOPSIS, MOOSRA and COPRAS are used to evaluate the green energy sources–solar, hydro, biogas and biomass and to identify the optimum source by appraising its functioning features based on entropy probability technique. An illustrative case study is presented in order to demonstrate the application feasibility of the combined approaches for the ranking of optimum green energy sources. The analyzed results show that biogas is the optimum green energy source having the highest score value obtained by combined approaches. The sensitivity analysis shows the robustness of the combined approaches with the highest effectiveness. The study not only considers the various cost criteria but other actors like power generation, implementation period and useful life are also considered to select the optimum green energy sources for future project investment.

scholarly journals A Feasibility Analysis of Controlling a Hybrid Power System over Short Time Intervals

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5682
Author(s):  
Tianyao Zhang ◽  
Diyi Chen ◽  
Jing Liu ◽  
Beibei Xu ◽  
Venkateshkumar M
Keyword(s):  
Solar Radiation ◽  
Hybrid Systems ◽  
Feasibility Analysis ◽  
Energy Sources ◽  
Systematic Change ◽  
Short Term ◽  
Time Intervals ◽  
Hybrid Power ◽  
The Stability ◽  
Short Time

Literature about the importance of renewable energy resources, including wind and solar energy, is becoming increasingly important; however, these energy sources are unstable and volatile in nature, and are usually integrated with conventional energy sources, such as hydropower, forming hybrid power generation systems that maintain a stable grid. Short-term changes in wind speed or solar radiation intensity have a great impact on the stability of hybrid systems, and have been reported in the literature. However, reliable models to manage such systems are lacking, and previous studies have regarded the hour scale as the minimum baseline for systematic change. In this article, hybrid power systems are proposed that are controlled on very short time intervals. The results of a feasibility analysis of the proposed model indicate the viability of complementary hybrid systems in controlling and maintaining the stability, which are subjected to short durations of fluctuations in wind or solar radiation. The simulation results indicate that the influence of the shutdown of the wind turbine, with the regulation effect of the hydro power, is 3–5 times greater than that of the short-term wind turbulence fluctuation. When the hydro turbine is adopted to adjust the short-term fluctuation of solar radiation, the effect on the system was suppressed to 0.02–0.2 times of the former.

scholarly journals The Consequences of Uncertainty: Climate Sensitivity and Economic Sensitivity to the Climate

2018 ◽  
Vol 10 (1) ◽  
pp. 189-205 ◽  
Author(s):  
John Hassler ◽  
Per Krusell ◽  
Conny Olovsson
Keyword(s):  
Climate Change ◽  
Climate Policy ◽  
Climate Sensitivity ◽  
Fossil Fuels ◽  
Carbon Tax ◽  
Green Energy ◽  
Integrated Assessment Model ◽  
Assessment Model ◽  
Energy Sources ◽  
Negative Impacts

We construct an integrated assessment model with multiple energy sources—two fossil fuels and green energy—and use it to evaluate ranges of plausible estimates for the climate sensitivity, as well as for the sensitivity of the economy to climate change. Rather than focusing explicitly on uncertainty, we look at extreme scenarios defined by the upper and lower limits given in available studies in the literature. We compare optimal policy with laissez faire, and we point out the possible policy errors that could arise. By far the largest policy error arises when the climate policy is overly passive; overly zealous climate policy (i.e., a high carbon tax applied when climate change and its negative impacts on the economy are very limited) does not hurt the economy much as there is considerable substitutability between fossil and nonfossil energy sources.

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