Development Of New Energy Systems Research Articles

Controlled synthesis of Mn3O4/Co9S8–Ni3S2 on nickel foam as efficient electrocatalyst for oxygen evolution reaction

Advances in electrochemical interfaces have greatly facilitated the development of new energy systems that can replace traditional fossil fuels. Oxygen evolution reaction (OER) is the core reaction in the new energy conversion system to produce hydrogen. Here, nanorods structure of Mn3O4/Co9S8–Ni3S2/NF-4 was designed and assembled. The Mn3O4 has served as an appropriate matrix to build a composite structure with Co9S8–Ni3S2 to enhance the stability of catalyst. And the introduction of Mn regulated the electronic structure of Ni and Co, which increased the OER activity of matericals. Further characterization and electrochemical testing have suggested that between polymetallic can effectively optimize conductivity and enhance reaction kinetics. Mn3O4/Co9S8–Ni3S2/NF-4 can achieve overpotential of 188 mV at the current density of 10 mA cm−2 in alkaline solution, with small Tafel slope of 43.2 mV dec−1 and satisfactory stability of 30 h at 10 mA cm−2. This work may show a feasible reference in the design of high-efficient OER catalysts.

Computer simulation of long line with loss in steady harmonic mode at active load

Background: The implementation of projects to create long-range power systems requires the greatest possible study of not only the technical feasibility of long lines, but also the features of energy transmission along these lines. Such studies can be carried out in the field, using a physical experiment or using computer simulation. The first is limited by the complexity of the experiment, the lack of access to real measurements. Unlike a physical experiment, computer simulation is devoid of these problems: it makes it quite easy not only to model a long line, but also to study it under various operating modes. The practical significance of this work is the applicability of the proposed method in the educational process when students of energy specialties of transport universities perform research on lines with distributed parameters to solve subsequent problems in the development or development of new energy systems of great extent.
 Aim: Building a computer model of a long line and developing a method for studying various modes of its operation under various loads, including idling and short circuit.
 Methods: Computer modelling.
 Results: A computer model of a line with distributed parameters has been constructed, which allows one to study it under various modes.
 Conclusion: As part of the development of energy systems, the relevance of developing and modeling new methods for studying various modes in such circuits increases many times over. At the same time, newly developed methods should be applicable in the educational process. The article describes computer simulation and study of a long line under various active loads of the distribution of the effective value of the voltage along the line during its transmission, equal to half the wavelength (half-wave line). Research in this direction has not only scientific significance, but also practical, since it is possible to reasonably develop new models of long lines, as well as solve problems in the field of studying non-stationary (transient) operating modes of long lines.

A high-efficiency oxygen evolution electrode material of a carbon material containing a NiCo bimetal.

The preparation of highly efficient, stable, and low-cost electrocatalysts for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) is still a challenge for the development of new energy systems. In this work, a NiCo bimetal loaded on porous carbon (NiCo-C/NF) grown on nickel foam (NF) was obtained via the pyrolysis of a NiCo bimetal MOF (NiCo-MOF/NF) under a nitrogen atmosphere at 500 °C. Compared with NiCo-MOF/NF, NiCo-C/NF had a larger specific surface and uniform mesoporous structure. As an electrocatalyst in the OER, this new type of electrode operated with better stability in an alkaline solution (1.0 mol L−1 KOH), the overpotential when the current density reached 10 mA cm−2 was only 260 mV, and the electrode also exhibited long-term durability in a stability test for 10 h without significant changes. The excellent activity and stability toward the OER can be attributed to the synergistic effect of the NiCo bimetal and the abundant active sites exposed after the carbonization of NiCo-MOF, which compensated for the defect of the insufficient conductivity of the material and promoted the evolution of oxygen in the catalytic process.

Research on Operation Risk Prevention and Control Method of Multi-energy Complementary New Energy Power Generation System under Market Mechanism

The development of multi-energy complementary new energy generation system is of great practical significance in today’s era when the demand for electricity is increasing and environmental protection is imminent. However, due to the limitation of external environment, internal technology and materials, the development of new energy system with multi-energy complementary energy is faced with many risks, which have a certain impact on its development. Risks cannot be avoided and will exist for a long time. Therefore, it is of great significance for the development of this system to correctly identify risks and evaluate them, and to propose corresponding countermeasures and focus according to the assessment results. This paper first analyzes and identifies qualitatively the risks faced by the new energy system under the market mechanism from the aspects of policy risk, transaction risk, market risk and operation risk. Then, the risk index database was established, and the risk of various aspects were presented side by side, and the main influencing factors of the risk were listed correspondingly. Next, risk assessment model is established through analytic hierarchy process and fuzzy comprehensive evaluation method, aiming to evaluate the above risks qualitatively. At the same time, a concrete example is introduced to apply and test the above model, and a constructive conclusion is obtained for the example, and the feasibility of the risk assessment model established in this paper is verified, which can be applied to risk assessment of other similar projects.

Wind Turbines Control: Features and Trends

Energy is the basis for economic development and it is important to have a reliable supply of energy for the sustainable development of any country. With the rapid growth of the global economy, the energy crisis is aggravating substantially. It is, therefore, of great interest to develop reliable renewable energy resources that can take up a relatively large proportion of the growing energy needs with the crucial features of energy security, environment protection and economic development. Since the beginning of the twenty first century, countries all over the world and international organizations have invested tremendous amount of funds for the development of new energy systems. As a competitor to the conventional energy sources, wind energy is considered to be an important source for a diversified energy portfolio, particularly, because it is a clean energy source with an inexhaustible supply. Wind energy has become one of the fastest growing renewable energy systems with promising prospects for large scale commercialization. We provide in this tutorial paper an overview brief of basic wind turbine energy control systems and an optimistic or reflective area in a recent industry developments and research in wind turbine control systems for more grid performance and frequency stability.

锂离子混合超级电容器电极材料研究进展

Nowadays, the rapid development of new energy system and electronic devices drives an increasing demand for energy storage equipments. Lithium ion hybrid supercapacitors, combining two different storage mechanisms of lithium-ion batteries and supercapacitors, have exhibited excellent properties such as high energy and power density, long cycling life and high safety. Due to these advantages, lithium ion hybrid supercapacitors have become a promising energy storage device for next generation of electric vehicles and hybrid electric vehicles. In this paper, we introduced respectively the characteristics and future study trend of lithium ion batteries and supercapacitors, and summarized the inherent characteristics of lithium ion hybrid supercapacitors and the corresponding three typical charge/discharge mechanisms. In addition, according to the different hybrid systems, we also summarized the research progress of non aqueous lithium ion hybrid supercapacitors in recent years.

Nanotechnology Plays a Key Role in the Development of New Energy Systems

ChemSusChemVolume 1, Issue 10 p. 858-859 Interview Nanotechnology Plays a Key Role in the Development of New Energy Systems Ulrich Buller Prof. Dr., Ulrich Buller Prof. Dr. ulrich.buller@zv.fraunhofer.de Fraunhofer-Gesellschaft Zentrale, Hansastrasse 27c, 80686 München (Germany), Fax: (+49) 81205-77 4000Search for more papers by this author Ulrich Buller Prof. Dr., Ulrich Buller Prof. Dr. ulrich.buller@zv.fraunhofer.de Fraunhofer-Gesellschaft Zentrale, Hansastrasse 27c, 80686 München (Germany), Fax: (+49) 81205-77 4000Search for more papers by this author First published: 15 October 2008 https://doi.org/10.1002/cssc.200800130Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume1, Issue10October 24, 2008Pages 858-859 RelatedInformation