Search | Engineering

订阅投稿

首页学术期刊学术焦点学术视频工程成就工程前沿关于我们 English

资源类型

期刊论文 162

年份

2023 19

2022 13

2021 15

2020 10

2019 13

2018 14

2017 8

2016 2

2015 8

2014 6

2013 22

2012 1

2011 7

2010 5

2009 9

2008 2

2007 4

2005 1

2003 2

展开︾

关键词

固体氧化物燃料电池 8

氧化石墨烯 3

SOFC 2

固体氧化物电解池 2

碳基燃料 2

聚环氧乙烷 2

Al@AP/PVDF纳米复合材料 1

CCS 1

CO₂分离 1

CO₂捕集 1

H₂O/CO₂共电解 1

PB-PSOI 1

SOFC电池堆 1

一氧化碳氧化 1

二氧化碳 1

二氧化碳还原 1

亚稳态分子间复合材料 1

交流阻抗 1

亲CO₂分离膜 1

展开︾

检索范围：

排序：展示方式：

Preparing graphene from anode graphite of spent lithium-ion batteries

Wenxuan Zhang, Zhanpeng Liu, Jing Xia, Feng Li, Wenzhi He, Guangming Li, Juwen Huang

《环境科学与工程前沿（英文）》 2017年第11卷第5期 doi: 10.1007/s11783-017-0993-8

摘要： With extensive use of lithium ion batteries (LIBs), amounts of LIBs were discarded, giving rise to growth of resources demand and environmental risk. In view of wide usage of natural graphite and the high content (12%–21%) of anode graphite in spent LIBs, recycling anode graphite from spent LIBs cannot only alleviate the shortage of natural graphite, but also promote the sustainable development of related industries. After calcined at 600°Cfor 1 h to remove organic substances, anode graphite was used to prepare graphene by oxidation-reduction method. Effect of pH and N2H4·H2O amount on reduction of graphite oxide were probed. Structure of graphite, graphite oxide and graphene were characterized by XRD, Raman and FTIR. Graphite oxide could be completely reduced to graphene at pH 11 and 0.25 mL N2H4·H2O. Due to the presence of some oxygen-containing groups and structure defects in anode graphite, concentrated H2SO4 and KMnO4 consumptions were 40% and around 28.6% less than graphene preparation from natural graphite, respectively.

关键词： Spent LIBs Graphite Graphite oxide Grapheme

HTML PDF 收藏

Permeability and thermal conductivity of host compressed natural graphite for consolidated activated

Bo TIAN, Liwei WANG, Zhequan JIN, Ruzhu WANG

《能源前沿（英文）》 2011年第5卷第2期页码 159-165 doi: 10.1007/s11708-011-0145-y

摘要： Permeability and thermal conductivity test units were set up to study the heat and mass transfer performance of the host material, i.e. expanded natural graphite (ENG), for consolidated activated carbon (AC) adsorbent. The permeability was tested with nitrogen as the gas source, and the thermal conductivity was studied using steady-state heat source method. The results showed that the values of permeability and thermal conductivity were 10 to 10 m and 1.7 to 3.2 W/(m·K), respectively, while the density compressed expanded natural graphite (CENG) varied from 100 to 500 kg/m . The permeability decreased with the increasing density of CENG, whereas the thermal conductivity increased with the increasing density of CENG. Then the thermal conductivity and permeability of granular AC were researched. It was discovered that the thermal conductivity of samples with different grain size almost kept constant at 0.36 W/(m·K) while the density was approximately 600 kg/m . This means that the thermal conductivity was not related to the grain size of AC. The thermal conductivity of CENG was improved by 5 to 10 times compared with that of granular AC. Such a result showed that CENG was a promising host material for AC to improve the heat transfer performance, while the mass transfer performance should be considered in different conditions for utilization of adsorbent.

关键词： permeability thermal conductivity expanded nature graphite activated carbon

HTML PDF 收藏

Electro-catalytic activity of CeO modified graphite felt for carbamazepine degradation via E-peroxone

《环境科学与工程前沿（英文）》 2021年第15卷第6期 doi: 10.1007/s11783-021-1410-x

摘要：

•CeO_x/GF-EP process had the better degradation efficiency than GF-EP process.

关键词： E-peroxone CeO_x Graphite felt Carbamazepine Mineralization

HTML PDF 收藏

for stress–strain relationship taking into account strain hardening and stored energy by compacted graphite

《机械工程前沿（英文）》 2023年第18卷第4期 doi: 10.1007/s11465-023-0761-3

摘要： Compacted graphite iron (CGI) is considered to be an ideal diesel engine material with excellent physical and mechanical properties, which meet the requirements of energy conservation and emission reduction. However, knowledge of the microstructure evolution of CGI and its impact on flow stress remains limited. In this study, a new modeling approach for the stress–strain relationship is proposed by considering the strain hardening effect and stored energy caused by the microstructure evolution of CGI. The effects of strain, strain rate, and deformation temperature on the microstructure of CGI during compression deformation are examined, including the evolution of graphite morphology and the microstructure of the pearlite matrix. The roundness and fractal dimension of graphite particles under different deformation conditions are measured. Combined with finite element simulation models, the influence of graphite particles on the flow stress of CGI is determined. The distributions of grain boundary and geometrically necessary dislocations (GNDs) density in the pearlite matrix of CGI under different strains, strain rates, and deformation temperatures are analyzed by electron backscatter diffraction technology, and the stored energy under each deformation condition is calculated. Results show that the proportion and amount of low-angle grain boundaries and the average GNDs density increase with the increase of strain and strain rate and decreased first and then increased with an increase in deformation temperature. The increase in strain and strain rate and the decrease in deformation temperature contribute to the accumulation of stored energy, which show similar variation trends to those of GNDs density. The parameters in the stress–strain relationship model are solved according to the stored energy under different deformation conditions. The consistency between the predicted results from the proposed stress–strain relationship and the experimental results shows that the evolution of stored energy can accurately predict the stress–strain relationship of CGI.

关键词： stress−strain relationship microstructure evolution stored energy strain hardening graphite morphology

HTML PDF 收藏

石墨资源及材料产业高质量发展战略研究

孙传尧 ,申士富 ,王文利 ,袁国辉 ,黄正宏 ,张以河

《中国工程科学》 2022年第24卷第3期页码 29-39 doi: 10.15302/J-SSCAE-2022.03.004

摘要：

天然石墨是一种由新制备及应用技术引领发展的新技术矿产，是支撑我国战略性新兴产业发展的重要原材料。本文分析了石墨资源及材料产业高质量发展的需求，总结了我国石墨资源及材料产业的发展现状，分析了我国石墨产业高质量发展的潜力和面临的主要问题，提出了我国石墨资源及材料产业下一步发展的目标。在此基础上，本文提出了石墨资源及材料产业高质量发展的举措，包括以石墨精深加工为中心布局技术创新体系；优化资源配置，加快发展绿色石墨企业及绿色石墨矿山；加强平台能力建设，夯实产业链供应链技术创新基础；重点突破石墨烯独特物性的专属应用，避免过度宣传。研究建议，健全我国石墨全产业链及供应链数据库，建立长期支持我国石墨产业高质量发展的政策机制，加快资源整合及“国际石墨谷”建设，规划布局创新能力平台和加强人才培养。

关键词：石墨；石墨深加工；石墨精矿；石墨烯；氟化石墨

HTML PDF 收藏

Performance of activated carbon coated graphite bipolar electrodes on capacitive deionization method

Hossein D. Atoufi, Hasti Hasheminejad, David J. Lampert

《环境科学与工程前沿（英文）》 2020年第14卷第6期 doi: 10.1007/s11783-020-1278-1

摘要： Abstract • Graphite bipolar electrodes act as an appropriate bed for the CDI process. • Activated carbon Coating improves the application of the electrodes. • CDI is an environmentally friendly method to apply for brackish water. • Initial concentration is the most important parameter in the CDI method. • CDI process in a batch-mode setup needs more development. This research investigates a capacitive deionization method for salinity reduction in a batch reactor as a new approach for desalination. Reductions of cost and energy compared with conventional desalination methods are the significant advantages of this approach. In this research, experiments were performed with a pair of graphite bipolar electrodes that were coated with a one-gram activated carbon solution. After completing preliminary tests, the impacts of four parameters on electrical conductivity reduction, including (1) the initial concentration of feed solution, (2) the duration of the tests, (3) the applied voltage, and (4) the pH of the solution, were examined. The results show that the maximum efficiency of electrical conductivity reduction in this laboratory-scale reactor is about 55%. Furthermore, the effects of the initial concentration of feed solution are more significant than the other parameters. Thus, using the capacitive deionization method for water desalination with low and moderate salt concentrations (i.e., brackish water) is proposed as an affordable method. Compared with conventional desalination methods, capacitive deionization is not only more efficient but also potentially more environmentally friendly.

关键词： Capacitive deionization (CDI) Desalination Electrical conductivity (EC) Graphite bipolar electrode Activated carbon coated (ACC)

HTML PDF 收藏

Recent advances toward high voltage, EC-free electrolytes for graphite-based Li-ion battery

Tong Zhang, Elie Paillard

《化学科学与工程前沿（英文）》 2018年第12卷第3期页码 577-591 doi: 10.1007/s11705-018-1758-z

摘要：

Lithium-ion batteries are a key technology in today’s world and improving their performances requires, in many cases, the use of cathodes operating above the anodic stability of state-of-the-art electrolytes based on ethylene carbonate (EC) mixtures. EC, however, is a crucial component of electrolytes, due to its excellent ability to allow graphite anode operation–also required for high energy density batteries–by stabilizing the electrode/electrolyte interface. In the last years, many alternative electrolytes, aiming at allowing high voltage battery operation, have been proposed. However, often, graphite electrode operation is not well demonstrated in these electrolytes. Thus, we review here the high voltage, EC-free alternative electrolytes, focusing on those allowing the steady operation of graphite anodes. This review covers electrolyte compositions, with the widespread use of additives, the change in main lithium salt, the effect of anion (or Li salt) concentration, but also reports on graphite protection strategies, by coatings or artificial solid electrolyte interphase (SEI) or by use of water-soluble binder for electrode processing as these can also enable the use of graphite in electrolytes with suboptimal intrinsic SEI formation ability.

关键词： lithium-ion electrolyte solid electrolyte interphase additives high voltage graphite

HTML PDF 收藏

Oxidation performance of graphite material in reactors

LUO Xiaowei, YU Xinli, YU Suyuan

《能源前沿（英文）》 2008年第2卷第4期页码 471-474 doi: 10.1007/s11708-008-0074-6

摘要： Graphite is used as a structural material and moderator for high temperature gas-cooled reactors (HTGR). When a reactor is in operation, graphite oxidation influences the safety and operation of the reactor because of the impurities in the coolant and/or the accident conditions, such as water ingress and air ingress. In this paper, the graphite oxidation process is introduced, factors influencing graphite oxidation are analyzed and discussed, and some new directions for further study are pointed out.

关键词： ingress accident oxidation coolant moderator

HTML PDF 收藏

Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries

Jingning SHAN, Xiaofang YANG, Chao YAN, Yiguang JU, Lin CHEN, Fang ZHAO

《能源前沿（英文）》 2019年第13卷第4期页码 626-635 doi: 10.1007/s11708-019-0650-y

摘要： Single wall carbon nanotube (SWCNT) additives were formulated into µm-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes. The critical role of small amount of SWCNT addition (0.2 wt%) was found for significantly improving delithiation capacity, first cycle coulombic efficiency (FCE), and capacity retention. Particularly, Si (10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92% FCE at 0.2 C during the first charge-discharge cycle, and 91% capacity retention after 50 cycles (0.5 C) in a half cell. Scanning electron microscope (SEM) was used to illustrate the electrode morphology, compositions and promoting function of the SWCNT additives. In addition, full cells assembled with high nickel-NCM811 cathodes and µm-Si-graphite composite anodes were evaluated for the consistence between half and full cell performance, and the consideration for potential commercial application. Finally, criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective.

关键词： lithium-ion battery Si anode Si-graphite composite single wall carbon nanotube (SWCNT) NCM811

HTML PDF 收藏

基于可拓学的球墨铸铁石墨形态识别

陈智斌,余永权,杨少敏

《中国工程科学》 2005年第7卷第3期页码 84-89

摘要：

根据石墨的形态特征，运用物元分析方法建立起关于石墨形态识别的物元模型，提出了可拓分类树方法，讨论了可拓分类树的构造和实现途径，并将其应用于石墨形态的类型判别；给出了典型的实验结果，并对该方法与现有识别方法作出比较。

关键词：物元模型可拓分类树石墨形态球墨铸铁

HTML PDF 收藏

Cuprous oxide/copper oxide interpenetrated into ordered mesoporous cellulose-based carbon aerogels for

《化学科学与工程前沿（英文）》 2023年第17卷第7期页码 918-929 doi: 10.1007/s11705-023-2305-0

摘要： The casual discharge of dyes from industrial settings has seriously polluted global water systems. Owing to the abundance of biomass resources, preparing photocatalysts for photocatalytic degradation of dyes is significant; however, it still remains challenging. In this work, a cuprous oxide/copper oxide composite was interpenetrated onto carbon nanosheets of cellulose-based flexible carbon aerogels (Cu₂O/CuO@CA_x) via a simple freeze-drying-calcination method. The introduction of the carbon aerogel effectively prevents the aggregation of the cuprous oxide/copper oxide composite. In addition, Cu₂O/CuO@CA_0.2 has a larger specific surface area, stronger charge transfer capacity, and lower recombination rate of photogenerated carriers than copper oxide. Moreover, Cu₂O/CuO@CA_0.2 exhibited high photocatalytic activity in decomposing methylene blue, with a degradation rate reaching up to 99.09% in 60 min. The active oxidation species in the photocatalytic degradation process were systematically investigated by electron spin resonance characterization and poisoning experiments, among which singlet oxygen played a major role. In conclusion, this work provides an effective method for preparing photocatalysts using biomass resources in combination with different metal oxides. It also promotes the development of photocatalytic degradation of dyes.

关键词： carbon aerogel photocatalysis dye degradation biomass cuprous oxide/copper oxide

HTML PDF 收藏

exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow biofilm reactor with conductive granular graphite

Zechong Guo, Lei Gao, Ling Wang, Wenzong Liu, Aijie Wang

《环境科学与工程前沿（英文）》 2018年第12卷第4期 doi: 10.1007/s11783-018-1074-3

摘要：

Methane yield increased 22 times from low-strength wastewater by applying conductive fillers.

Conductive fillers accelerated the start-up stage of anaerobic biofilm reactor.

Conductive fillers altered methanogens structure.

关键词： Low-strength wastewater Methane production Conductive filler Microbial community structure

HTML PDF 收藏

Mechanical properties and microstructure of multilayer graphene oxide cement mortar

《结构与土木工程前沿（英文）》 2021年第15卷第4期页码 1058-1070 doi: 10.1007/s11709-021-0747-3

摘要： This study reports on the effects of multilayer graphene oxide (MGO) on compressive strength, flexural strength, and microstructure of cement mortar. The cement mortar was prepared with type P. II. 52.5 Portland cement, standard sand, and MGO. Four mixes were prepared with inclusion of MGO (0%, 0.02%, 0.04%, and 0.06% by weight of cement). The testing result shows that the compressive of GO-cement mortar increased by 4.84%–13.42%, and the flexural strength increased by 4.37%–8.28% at 3 d. GO-cement mortar’s compressive strength and flexural strength at 7 d increased by 3.84%–12.08% and 2.54%–13.43%, respectively. MGO made little contribution to the increases of compressive strength and flexural strength of cement mortar at 28 d. The results of X-ray diffraction (XRD), scanning electron microscope (SEM), and nitrogen (N₂) adsorption/desorption tests show that the types of hydration products and crystal grain size did not change after adding MGO. Still, it can help to improve the microstructure of the cement mortar via regulating hydration products and can provide more condensed cores to accelerate hydration. Furthermore, the regulating action of MGO for the microstructure of cement mortar at an early age was better than that at 28 d.

关键词： graphene oxide cement mortar mechanical properties microstructure

HTML PDF 收藏

Ammonia adsorption on graphene and graphene oxide: a first-principles study

Yue PENG, Junhua LI

《环境科学与工程前沿（英文）》 2013年第7卷第3期页码 403-411 doi: 10.1007/s11783-013-0491-6

摘要： Motivated by the recent realization of graphene sensor to detect gas molecules that are harmful to the environment, the ammonia adsorption on graphene or graphene oxide (GO) was investigated using first-principles calculation. The optimal adsorption and orientation of the NH molecules on the graphene surfaces were determined, and the adsorption energies ( ) as well as the Mulliken charge transfers of NH were calculated. The for the graphene are small and seem to be independent of the sites and orientations. The surface epoxy or hydroxyl groups can promote the adsorption of NH on the GO; the enhancement of the for the hydroxyl groups is greater than that for the epoxy groups on the surface. The charge transfers from the molecule to the surfaces also exhibit the same trend. The Br?nsted acid sites and Lewis acid sites could stably exist on the GO with surface hydroxyl groups and on the basal, respectively.

关键词： graphene oxide first-principles calculations NH₃ adsorption

HTML PDF 收藏

Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

《能源前沿（英文）》 2012年第6卷第1期页码 29-34 doi: 10.1007/s11708-012-0178-x

摘要： Pure Fe, Cr, Al, Ti elemental powders and pre-alloyed Y O powder were processed by high energy mechanical milling. The compositions of the mixed powders are designed as Fe-18Cr-0.2Ti-0.35Y O and Fe-18Cr-5Al-0.2Ti-0.35Y O in weight percent. The as-milled powders were consolidated by hot extrusion at 1423 K. The dispersed oxide particles were identified to be titania+ yttria for Al-free oxide dispersion strengthened (ODS) steel and alumina+ yttria for Al-added ODS steel, respectively. The ultimate tensile strength of Al-free ODS steel was higher than that of Al-added ODS steel over the temperature range of 298–973 K, because of the difference in number density and size of thermally stable oxide particles dispersed in both steel matrices. The strength in the longitudinal direction was lower than that in the transverse direction, probably due to anisotropy of the microstructure with elongated grains in the hot-extrusion direction for the 18%Cr-ODS steels with and without 5%Al.

关键词： oxide dispersion strengthened (ODS) steel milling extrusion aluminum yttria

HTML PDF 收藏

标题作者时间类型操作

Preparing graphene from anode graphite of spent lithium-ion batteries

Wenxuan Zhang, Zhanpeng Liu, Jing Xia, Feng Li, Wenzhi He, Guangming Li, Juwen Huang

期刊论文

Permeability and thermal conductivity of host compressed natural graphite for consolidated activated

Bo TIAN, Liwei WANG, Zhequan JIN, Ruzhu WANG

期刊论文

Electro-catalytic activity of CeO modified graphite felt for carbamazepine degradation via E-peroxone

期刊论文

for stress–strain relationship taking into account strain hardening and stored energy by compacted graphite

期刊论文

石墨资源及材料产业高质量发展战略研究

孙传尧 ,申士富 ,王文利 ,袁国辉 ,黄正宏 ,张以河

期刊论文

Performance of activated carbon coated graphite bipolar electrodes on capacitive deionization method

Hossein D. Atoufi, Hasti Hasheminejad, David J. Lampert

期刊论文

Recent advances toward high voltage, EC-free electrolytes for graphite-based Li-ion battery

Tong Zhang, Elie Paillard

期刊论文

Oxidation performance of graphite material in reactors

LUO Xiaowei, YU Xinli, YU Suyuan

期刊论文

Promoting Si-graphite composite anodes with SWCNT additives for half and NCM811 full lithium ion batteries

Jingning SHAN, Xiaofang YANG, Chao YAN, Yiguang JU, Lin CHEN, Fang ZHAO

期刊论文

基于可拓学的球墨铸铁石墨形态识别

陈智斌,余永权,杨少敏

期刊论文

Cuprous oxide/copper oxide interpenetrated into ordered mesoporous cellulose-based carbon aerogels for

期刊论文

exoelectrogen-methanogen evolution from low-strength wastewater in an up-flow biofilm reactor with conductive granular graphite

Zechong Guo, Lei Gao, Ling Wang, Wenzong Liu, Aijie Wang

期刊论文

Mechanical properties and microstructure of multilayer graphene oxide cement mortar

期刊论文

Ammonia adsorption on graphene and graphene oxide: a first-principles study

Yue PENG, Junhua LI

期刊论文

Development of oxide dispersion strengthened ferritic steels with and without aluminum

Jae Hoon LEE

期刊论文

京公网安备 11010502051620号京ICP备11030251号-2

关注我们