Application of Power Electronics Converters in Renewable Energy

Against the backdrop of global energy shortages and increasingly severe environmental pollution,renewable energy is gradually becoming a significant direction for future energy development.Power electronics converters,as the core technology for energy conversion and control,play a crucial role in enhancing the efficiency and stability of renewable energy systems.This paper explores the basic principles and functions of power electronics converters and their specific applications in photovoltaic power generation,wind power generation,and energy storage systems.Additionally,it analyzes the current innovations in high-efficiency energy conversion,multilevel conversion technology,and the application of new materials and devices.By studying these technologies,the aim is to promote the widespread application of power electronics converters in renewable energy systems and provide theoretical and technical support for achieving sustainable energy development.

Special Issue on New Concepts and Advances in Photocatalytic Materials for Sustainable Energy

The use of solar energy to drive the chemical and energy processes,and the chemical storage of solar energy are the key elements to move to a low-carbon economy,sustainable society and to foster energy transition.For this reason,there is a fast-growing scientific interest on this subject,which is part of the general effort for a solar-driven chemistry and energy,the chemistry of the future.To realize this

Two-dimensional material separation membranes for renewable energy purification, storage, and conversion

The current energy crisis has prompted the development of new energy sources and energy storage/conversion devices. Membranes, as the key component, not only provide enormous separation potential for energy purification but also guarantee stable and high-efficiency operation for rechargeable batteries and fuel cells. Remarkably, two-dimensional(2D) material separation membranes have attracted intense attention on their excellent performance in energy field applications, owing to high mechanical/chemical stability, low mass transport resistance, strict sizeexclusion, and abundant modifiable functional groups. In this review, we concentrate on the recent progress of 2D membrane and introduce 2D membranes based on graphene oxide(GO), MXenes, 2D MOFs, 2D COFs, and 2D zeolite nanosheets, which are applied in membrane separation(H2 collection and biofuel purification) and battery separators(vanadium flow battery, Li–S battery, and fuel cell). The mass transport mechanism, selectivity mechanism, and modification methods of these 2D membranes are stated in brief, mainly focusing on interlayer dominant membranes(GO and MXenes) and pore dominant membranes(MOFs, COFs, and zeolite nanosheets). In conclusion, we highlight the challenges and outlooks of applying 2D membranes in energy fields.

Cellulose-based smart materials:Novel synthesis techniques,properties,and applications in energy storage and conversion devices

There has been a significant scope toward the cutting-edge in-vestigations in hierarchical carbon nanostructured electrodes originating from cellulosic materials,such as cellulose nanofibers,available from natural cellulose and bacterial cellulose.Elements of energy storage systems(ESSs)are typically established upon inorganic/metal mixtures,carbonaceous implications,and petroleum-derived hydrocarbon chem-icals.However,these conventional substances may need help fulfilling the ever-increasing needs of ESSs.Nanocellulose has grown significantly as an impressive 1D element due to its natural availability,eco-friend-liness,recyclability,structural identity,simple transformation,and dimensional durability.Here,in this review article,we have discussed the role and overview of cellulose-based hydrogels in ESSs.Additionally,the extraction sources and solvents used for dissolution have been dis-cussed in detail.Finally,the properties(such as self-healing,trans-parency,strength and swelling behavior),and applications(such as flexible batteries,fuel cells,solar cells,flexible supercapacitors and carbon-based derived from cellulose)in energy storage devices and conclusion with existing challenges have been updated with recent findings.

Recent development of three-dimension printed graphene oxide and MXene-based energy storage devices

The research for three-dimension(3D)printing carbon and carbide energy storage devices has attracted widespread exploration interests.Being designable in structure and materials,graphene oxide(GO)and MXene accompanied with a direct ink writing exhibit a promising prospect for constructing high areal and volume energy density devices.This review not only summarizes the recent advances in 3D printing energy storage devices including printing methods,ink rheological properties,and different energy storage systems,but also discusses the printing methods related to energy storage.In addition,the binder or additive free of two-dimensional carbide materials is quite important for the present electrochemical energy storage devices,which also are presented.

Photo-rechargeable batteries and supercapacitors:Critical roles of carbon-based functional materials

As a clean and renewable energy source,solar energy is a competitive alternative to replace conventional fossil fuels.Nevertheless,its serious fluctuating nature usually leads to a poor alignment with the actual energy demand.To solve this problem,the direct solar-to-electrochemical energy conversion and storage have been regarded as a feasible strategy.In this context,the development of high-performance integrated devices based on solar energy conversion parts(i.e.,solar cells or photoelectrodes)and electrochemical energy storage units(i.e.,rechargeable batteries or supercapacitors[SCs])has become increasingly necessary and urgent,in which carbon and carbon-based functional materials play a fundamental role in determining their energy conversion/storage performances.Herein,we summarize the latest progress on these integrated devices for solar electricity energy conversion and storage,with special emphasis on the critical role of carbon-based functional materials.First,principles of integrated devices are introduced,especially roles of carbon-based materials in these hybrid energy devices.Then,two major types of important integrated devices,including photovoltaic and photoelectrochemicalrechargeable batteries or SCs,are discussed in detail.Finally,key challenges and opportunities in the future development are also discussed.By this review,we hope to pave an avenue toward the development of stable and efficient devices for solar energy conversion and storage.

Sensing as the key to the safety and sustainability of new energy storage devices

New energy storage devices such as batteries and supercapacitors are widely used in various fields because of their irreplaceable excellent characteristics.Because there are relatively few monitoring parameters and limited under-standing of their operation,they present problems in accurately predicting their state and controlling operation,such as state of charge,state of health,and early failure indicators.Poor monitoring can seriously affect the performance of energy storage devices.Therefore,to maximize the efficiency of new energy storage devices without damaging the equipment,it is important to make full use of sensing systems to accurately monitor important parameters such as voltage,current,temperature,and strain.These are highly related to their states.Hence,this paper reviews the sensing methods and divides them into two categories:embedded and non-embedded sensors.A variety of measurement methods used to measure the above parameters of various new energy storage devices such as batteries and super-capacitors are systematically summarized.The methods with different innovative points are listed,their advantages and disadvantages are summarized,and the application of optical fiber sensors is emphasized.Finally,the challenges and prospects for these studies are described.The intent is to encourage researchers in relevant fields to study the early warning of safety accidents from the root causes.

Charge Storage Properties of Aqueous Halide Supercapatteries with Activated Carbon and Graphene Nanoplatelets as Active Electrode Materials

Device level performance of aqueous halide supercapatteries fabricated with equal electrode mass of activated carbon or graphene nanoplatelets has been characterized.It was revealed that the surface oxygen groups in the graphitic structures of the nanoplatelets contributed toward a more enhanced charge storage capacity in bromide containing redox electrolytes.Moreover,the rate performance of the devices could be linked to the effect of the pore size of the carbons on the dynamics of the inactive alkali metal counterion of the redox halide salt.Additionally,the charge storage performance of aqueous halide supercapatteries with graphene nanoplatelets as the electrode material may be attributed to the combined effect of the porous structure on the dynamics of the non-active cations and a possible interaction of the Br^(-)/(Br_(2)+Br^(-)_(3))redox triple with the surface oxygen groups within the graphitic layer of the nanoplatelets.Generally,it has been shown that the surface groups and microstructure of electrode materials must be critically correlated with the redox electrolytes in the ongoing efforts to commercialize these devices.

Energy Technologies as Power Storage and Generation towards the Business Model in Sustainable Society

Energy security and CO2 reduction are one of the most important issues as well as food matter in the 21st century. Power storage and power generation will contribute to solution of these issues. Electrochemical storage of Li-ion batteries is widely applied in mobile applications, and the new application for automobile using has been actively developed and partially realized. And the Li-ion battery storage in smart grid systems is also expected. Automobile use and storage use have large market size same as the size of memory semiconductor. For these diverse applications, material research and development are key technologies. From power generation, Solid Oxide Fuel Cell and Dye Sensitized Solar Cell are much expected as new technology devices. The business model is important to realize these new devices considering the value compared with the existing methods.

新能源材料与器件课程O2O智慧教学模式探索

新能源材料对“碳达峰、碳中和”国家战略目标的实现具有重要的支撑作用。新能源材料与器件课程是新能源材料研究与应用的基础,也是新能源人才培养过程中的主干课程,现有教学模式很难满足对高质量新能源人才的培养,因此该文提出将“智慧教学”理念及“O2O模式”应用到课程教学的各个环节。通过信息化技术搭建智慧教育平台,延伸教与学的边界,建构出一种虚实相生、情境结合、意象交融的教学空间;通过智能化的方式提高教学效率,增强教学互动,提升学生学习效率,加强信息反馈和教学管理。从而开发教师和学生的聪明才智和主观能动性,使投入得到最大化产出、获得最优学习效果,支撑我国新能源人才的培养。

不同压缩比螺旋翅片对相变储能罐蓄热的影响机制

在传统螺旋翅片基础上提出3种不同压缩比的螺旋翅片结构。首先数值模拟不同压缩比的螺旋翅片储能罐相变材料的熔化过程;其次,讨论4个储能罐中温度场和固液界面的演变情况;再次,分析液相分数、平均温度和平均努塞尔数的变化趋势;最后,对比不同压缩比下相变材料的总蓄热量、熔化时间和平均蓄热速率。结果表明:设计压缩比合适的螺旋翅片可有效促进储能装置相变材料的熔化,减轻下部温度垂直分层现象,增强相变材料的自然对流,提升相变储能罐的蓄热性能;随着压缩比的增加,蓄热速率呈先增加后减小的趋势,而完全熔化时间则先减少后增加;与无压缩螺旋翅片的储能罐相比,当压缩比为3时,石蜡完全熔化时间缩短27.27%,平均蓄热速率提升33.33%,但当压缩比增加到7时,平均蓄热速率反而下降25%,完全熔化时间增加34.67%。

新能源材料技术课程实施课程思政的设计及实践

在专业课程教学中融入课程思政是坚持立德树人、教书育人的需要。该文结合作者从事新能源材料技术课程教学的实际,深入挖掘该课程中的思政元素,并辅以适当的教学方法将职业道德教育、法律意识、环境保护理念和爱国主义教育等元素引入到课堂教学中,以此提高学生参与教学积极性,丰富材料相关专业教学内容,使学生在学习专业课程知识的同时思想道德素质得到全面提高。该文为专业课的课程思政实施提供有效案例,为材料专业人才落实立德树人根本任务、围绕培养目标、细化课程目标进行积极的探索,取得较好的效果。

新能源材料发展与技能型人才培养关系研究

随着全球能源结构的变革,新能源材料行业正迎来前所未有的发展机遇。通过对新能源材料行业业态发展与变迁的分析,揭示其对技术技能人才提出的新要求,探讨在发展新质生产力背景下的“三新”启示与路径选择,提出政策赋能、资源集聚、实施“五金”建设等策略,深化职业教育赋能新能源材料行业发展,助力实现高技能人才培养规模与质量的双提升,推动新能源材料行业持续高质量发展。

新能源汽车轻量化设计与材料创新:提高能源利用效率和续航里程的方法研究

随着环境保护意识的增强和能源危机的加剧,新能源汽车作为替代传统燃油车辆的重要选择备受关注。新能源汽车在续航里程和能源利用效率方面仍存在挑战。轻量化设计和材料创新成为提升新能源汽车性能的关键。本研究旨在探讨如何通过轻量化设计和材料创新,提高新能源汽车的能源利用效率和续航里程,为推动新能源汽车行业的可持续发展提供有效方法和理论支持。文章旨在探讨新能源汽车轻量化设计的意义、关键技术、挑战与解决方案,以及未来发展方向。

新能源冷藏车制冷机锁扣注射模设计

针对10%碳纤维改性PEEK材料的新能源冷藏车制冷机锁扣,设计了1模2腔三板注射模,模具浇注系统使用点浇口,采用4个定模滑块先抽芯机构实现成型塑件部分特征的脱模,其中1个为斜向抽芯机构,3个为直线型抽芯机构。抽芯机构依靠开模动力驱动锁紧块拉动滑块抽芯和锁紧,动作可靠且效率高,保证了塑件的成型效率及成型品质。

“双碳”目标下“二维三阶”混合教学模式的探索——以新能源材料类课程为例

在“双碳”目标及能源转型的背景下,新能源材料类人才的需求逐年增加,如何培养新能源材料领域的专业人才是相关课程改革的重点,推动人才培养的创新教学模式迫在眉睫。以新能源材料类课程为例,针对基础课程理论性强、内容枯燥难懂的特点,提出“二维三阶”混合教学模式,革新“线上+线下”、“课前+课中+课后”教学过程、优化考核机制,充分发挥学生的主体地位,让学生将所学理论知识与实践应用融会贯通,学以致用,为我国实现“双碳”目标培养战略性科技人才后备军。

新能源驱动电机铁芯防锈包装存在问题及解决方案

针对新能源电机用铁芯储运过程中的防锈包装要求,分析电机用铁芯防锈包装现状,系统梳理当前电机用铁芯防锈包装存在问题,提出解决方案,明确电机用铁芯防锈包装未来发展趋势,为进一步提升新能源电机用铁芯防锈包装洁净度及可靠性提供参考。

树脂基纤维复合材料在新能源汽车上的应用

树脂基纤维复合材料具有密度小、模量高、比强度高等优点,是优异的车用轻量化材料。为更好地探寻新能源汽车零部件的用材趋势,文章对树脂基纤维复合材料在国内外新能源汽车上的应用进行了详细的分析。研究发现,碳纤维增强复合材料虽然成本高,但由于优异的性能,仍在部分高端车型上大量使用,用以提升品牌影响力;玻纤增强复合材料,成本较低,是理想的轻量化材料,近几年在新能源汽车上大量应用;天然纤维增强复合材料的应用主要是为了提升低碳、环保的形象;玄武岩纤维增强复合材料目前还未形成完整的产业链,但未来有广阔的发展空间。文章的分析为新能源汽车零部件的选材提供了依据和指引方向。

低温锂离子电容器研究进展

锂离子电容器(LIC)采用了双电层电容器(EDLC)正极和锂离子电池(LIB)负极,因而兼具高能量密度、高功率密度和长循环寿命的优势.LIC在储能过程中正极表面发生电荷的可逆吸脱附,负极体相中存在Li+的反复嵌入/脱嵌,在低温环境下由于电解液的黏度、电导率等物化性质发生很大改变,严重影响了LIC中离子的正常运输和电荷转移,导致无法在低温工况下正常运转,限制了其全天候、宽温域的应用.因此改善LIC的低温性能成为现阶段亟待解决的问题,受到了业界的广泛关注.众多研究表明电极材料和电解液之间的相互作用直接决定LIC低温电荷存储的过程,是解决低温环境下LIC能量密度和功率密度低的关键环节.本文从电极材料和电解液两个方面综述了国内外LIC低温性能的研究进展,概述了现阶段低温碳基材料的化学改性、表面修饰、离子嵌入以及新型电极材料的研发,并从电解液的锂盐、溶剂、添加剂三部分出发,介绍了低温工况下电解液各组成部分对LIC性能的影响,对不同改进工艺进行了分类与总结,重点讨论了新型低温添加剂在LIC中的应用,最后总结了新一代低温电解液的研究进展并对具有宽温度工况的下一代LIC提供了初步展望.

新能源汽车电池发展潜力与未来趋势探索

全球不断增长的能源需求和环境污染问题形成了严峻的挑战,使新能源汽车备受社会瞩目。新能源汽车关键三要素(动力电池、电驱、电控)等相关科学问题的研究和发展是该领域的中心课题,特别是动力电池在高密度、续航能力、循环寿命等方面的进展和突破急需亟待解决。现以新能源汽车电池为切入点,深入剖析了电池的现状,进一步研究了电池新型材料的创新趋势,包括钠离子电池替代锂、四元以上电池以及负极材料的突破,为新能源汽车的不断创新和可持续发展提供了积极助力。