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Graphene-anchored sodium single atoms:A highly active and stable catalyst for transesterification reaction

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Nano Research 2024年第6期17卷 4979-4985页

作者： Song-Song peng Yao Nian Xing-Ru Song Xiang-Bin Shao Chen Gu Zhi-Wei Xing Shi-Chao Qi peng Tan you Han xiao-Qin Liu Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech University30 South Puzhu RoadNanjing 211816China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Solid strong base catalysts have received considerable attention in various organic reactions due to their facile separation,neglectable corrosion,and environmental *** great progress has been made in the preparation of solid strong base catalysts,it is still challenging to avoid basic sites aggregation on support and active sites loss in reaction ***,we report a tandem redox strategy to prepare Na single atoms on graphene,producing a new kind of solid strong base catalyst(Na1/G).The base precursor NaNO_(3)was first reduced to Na2O by graphene(400℃)and successively to single atoms Na anchored on the graphene vacancies(800℃).Owing to the atomically dispersed of basicity,the resultant catalyst presents high activity toward the transesterification of methanol and ethylene carbonate to synthesize dimethyl carbonate(turnover frequency(TOF)value:125.7 h^(−1)),which is much better than the conventional counterpart Na2O/G and various reported solid strong bases(TOF:1.0-90.1 h^(−1)).Furthermore,thanks to the basicity anchored on graphene,the Na1/G catalyst shows excellent durability during *** work may provide a new direction for the development of solid strong base catalysts.

关键词： solid strong base catalyst basic sites redox graphene single Na atoms

Impact of volcanism on the formation and hydrocarbon generation of organic-rich shale in the Jiyang Depression, Bohai Bay Basin, China

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Petroleum Science 2024年第3期21卷 1539-1551页

作者： Jia-Hong Gao Xin-Ping Liang Zhi-Jun Jin Quan-you Liu Chang-Rong Li xiao-Wei Huang Ju-Ye Shi peng Li State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development Institute of EnergyPeking University Petroleum Exploration and Production Research Institute SINOPECBeijing100871 China School of Energy Resources China University of Geosciences Beijing100083 China

Globally,most organic-rich shales are deposited with volcanic ash *** ash,a source for many sedimentary basins,can affect the sedimentary water environment,alter the primary productivity,and preserve the organic matter(OM)through physical,chemical,and biological *** an increasing number of breakthroughs in shale oil exploration in the Bohai Bay Basin in recent years,less attention has been paid to the crucial role of volcanic impact especially its influence on the OM enrichment and hydrocarbon ***,we studied the petrology,mineralogy,and geochemical characteristics of the organic-rich shale in the upper submember of the fourth member(Es_(4)^(1))and the lower submember of the third member(Es_(3)^(3))of the Shahejie Formation,aiming to better understand the volcanic impact on organic-rich shale *** results show that total organic carbon is higher in the upper shale intervals rich in volcanic ash with enriched light rare earth elements and moderate Eu *** indicates that volcanism promoted OM formation before or after the *** positive correlation between Eu/Eu*and Post-Archean Australian Shale indicates hydrothermal activity before the volcanic *** plane graph of the hydrocarbon-generating intensity(S1+S2)suggests that the heat released by volcanism promoted hydrocarbon ***,the nutrients carried by volcanic ash promoted biological blooms during Es_(4)^(1 )and Es_(3)^(3) deposition,yielding a high primary *** blooms consume large amounts of oxygen and form anoxic environments conducive to the burial and preservation of ***,this study helps to further understand the organic-inorganic interactions caused by typical geological events and provides a guide for the next step of shale oil exploration and development in other lacustrine basins in China.

关键词： Volcanic ash Hydrocarbon generation Organic-rich shale Shahejie Formation Jiyang Depression

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载流子选择性接触:高效硅太阳电池的选择

物理学报 2017年第15期66卷 312-318页

作者：肖友鹏高超王涛周浪南昌大学光伏研究院南昌330031

太阳电池可看成由光子吸收层和接触层两个基本单元组成,接触层是高复合活性金属界面和光子吸收层之间的区域.为了进一步提高硅太阳电池的转换效率,关键是降低光子吸收层和接触之间的复合损失.近年来,载流子选择性接触引起了光伏界的研... 详细信息

太阳电池可看成由光子吸收层和接触层两个基本单元组成,接触层是高复合活性金属界面和光子吸收层之间的区域.为了进一步提高硅太阳电池的转换效率,关键是降低光子吸收层和接触之间的复合损失.近年来,载流子选择性接触引起了光伏界的研究兴趣,其被认为是接近硅太阳电池效率理论极限的最后的障碍之一.本文分析了三种类型的载流子选择性接触:在光子吸收层与金属界面之间引入薄的重掺杂层,即所谓的发射极或背面场;利用两种材料之间的导带或价带对齐;利用高功函数的金属氧化物与晶硅接触从而在晶硅中感应能带弯曲.基于一维太阳电池模拟软件wx AMPS,模拟了扩散同质结硅太阳电池[结构为(p^+)c-Si/(n)c-Si/(n^+)c-Si]、非晶硅薄膜硅异质结太阳电池[结构为(p^+)a-Si/(i)a-Si/(n)c-Si/(i)a-Si/(n^+)a-Si]和氧化物薄膜硅异质结太阳电池[结构为(n)MoO_x/(n)c-Si/(n)TiO_x]暗态下的能带结构和载流子浓度的空间分布,其中c-Si为晶硅;a-Si为非晶硅;(i),(n)和(p)分别表示本征、n型掺杂和p型掺杂.模拟结果表明:载流子选择性接触的核心是在接触处晶硅表面附近形成载流子浓度空间分布的不对称进而使得电导率的不对称,形成了对电子的高阻和空穴的低阻或者对空穴的高阻和电子的低阻,从而让空穴轻松通过同时阻挡电子,或者让电子轻松通过同时阻挡空穴,形成空穴选择性接触或者电子选择性接触.

关键词：硅太阳电池载流子选择性接触电导率不对称

On the Factors Influencing the High Stretch-Flangeability of a Low-Density 1180 MPa Fe-Mn-Al-C-Nbδ-QP Steel

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1291-1300页

作者： Dan‑Dan Cui peng Chen peng‑Fei Wang xiao‑Wu Li Department of Materials Physics and Chemistry School of Materials Science and Engineeringand Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Low-densityδ-quenching and partitioning(δ-QP)steels with excellent strength and ductility have been recently ***,there are still rare reports on the formability of δ-QP steels,which are critical for satisfying the manufacture of structural parts during the application in automotive *** the present work,an 1180 MPa Fe–Mn–Al–C–Nbδ-QP steel with a high ductility was adopted for the stretch–flangeability ***δ-QP steel was developed by separated quenching and partitioning processes.A good hole expansion ratio(HER)of 34.9±0.9%was obtained in the quenched steel,but it has been further increased to 52.2%by the tempering *** improved stretch–flangeability was attributed to the enhanced austenite stability and deformation *** the one hand,the stability of austenite was increased by carbon partitioning during tempering,which reduced crack possibility via the suppression of the fresh martensite *** the other hand,the tempering treatment released the internal stress caused by martensitic transformation and reduced the difference in strength among different phases,resulting in an increase in the resistance to crack initiation and propagation.

关键词： Hole expansion ratio Low-densityδ-quenching and partitioning(δ-QP)steel Stretch-flangeability Austenite stability Deformation uniformity

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硒化亚锗异质结太阳电池模拟研究

物理学报 2023年第24期72卷 332-342页

作者：肖友鹏王怀平冯林东华理工大学核技术应用教育部工程研究中心南昌330013 东华理工大学机械与电子工程学院南昌330013

薄膜太阳电池技术中研究的热点之一是寻找能够替代碲化镉和铜铟镓硒的吸收层材料,近来具有优异材料和光电特性的硒化亚锗(germanium selenide,GeSe)进入了科研人员的视野.影响异质结太阳电池性能的主要是各功能层材料的材料特性和构筑... 详细信息

薄膜太阳电池技术中研究的热点之一是寻找能够替代碲化镉和铜铟镓硒的吸收层材料,近来具有优异材料和光电特性的硒化亚锗(germanium selenide,GeSe)进入了科研人员的视野.影响异质结太阳电池性能的主要是各功能层材料的材料特性和构筑的器件结构以及结构中异质结界面处的界面特性.本文以GeSe为吸收层,配备了性能稳定的无机材料TiO_(2)和Cu_(2)O分别作为太阳电池的电子输运层和空穴输运层,构筑了结构为FTO/TiO_(2)/GeSe/Cu_(2)O/Metal的异质结太阳电池.选用TiO_(2)和Cu_(2)O作为载流子输运层是因为两者分别与吸收层GeSe形成小的尖峰状的导带带阶和价带带阶,不会妨碍多子输运的同时能有效抑制界面处载流子的复合.接着利用wxAMPS软件模拟分析了有关功能层材料参数和异质结界面特性以及工作温度对太阳电池性能参数的影响,结合实际应用选定相关材料参数,优化后300 K温度下GeSe异质结太阳电池的开路电压Voc为0.752 V,短路电流Jsc为40.71 mA·cm^(-2),填充因子FF为82.89%,转换效率η为25.39%.研究结果表明结构为FTO/TiO_(2)/GeSe/Cu_(2)O/Au的太阳电池有成为高效、低毒和低成本的太阳电池的潜力,同时模拟分析也为设计和制备异质结太阳电池提供一定借鉴.

关键词：硒化亚锗二氧化钛氧化亚铜太阳电池模拟

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CIGS薄膜太阳电池柔性化

电源技术 2015年第12期39卷 2788-2791页

作者：肖友鹏江西科技学院机械工程学院江西南昌330098

铜铟镓硒(copper indium gallium di Selenide,CIGS)被公认为最佳的薄膜太阳电池材料之一,CIGS薄膜太阳电池是一种高效的薄膜太阳电池。分析了柔性CIGS薄膜太阳电池的结构、衬底材料的选择、扩散垒的作用、吸收层和缓冲层的制备和特性,... 详细信息

铜铟镓硒(copper indium gallium di Selenide,CIGS)被公认为最佳的薄膜太阳电池材料之一,CIGS薄膜太阳电池是一种高效的薄膜太阳电池。分析了柔性CIGS薄膜太阳电池的结构、衬底材料的选择、扩散垒的作用、吸收层和缓冲层的制备和特性,介绍了不锈钢箔、铝箔聚酰亚胺等柔性衬底CIGS薄膜太阳电池的研发情况,最后展望了柔性CIGS薄膜太阳电池的应用前景。

关键词：铜铟镓硒薄膜太阳电池衬底柔性化

基于PVsyst的户用独立光伏发电系统优化设计

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电源技术 2016年第7期40卷 1454-1457页

作者：肖友鹏江西科技学院机械工程学院江西南昌330098

基于PVsyst软件优化设计户用独立光伏发电系统,模拟系统运行性能。系统能量利用率为69.2%,用户需求满足率为94.3%,设计的独立光伏发电系统整体性能表现良好。为了提高系统设计的可靠性、效率、精度,工程技术人员应该利用PVsyst软件和其... 详细信息

基于PVsyst软件优化设计户用独立光伏发电系统,模拟系统运行性能。系统能量利用率为69.2%,用户需求满足率为94.3%,设计的独立光伏发电系统整体性能表现良好。为了提高系统设计的可靠性、效率、精度,工程技术人员应该利用PVsyst软件和其他模拟软件作为光伏系统设计和优化的辅助工具。

关键词：光伏发电 PVsyst 优化设计

Sulphur-template method for facile manufacturing porous silicon electrodes with enhanced electrochemical performance

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Chinese Chemical Letters 2024年第8期35卷 433-436页

作者： peng Zhou Ziang Jiang Yang Li peng xiao Feixiang Wu Powder Metallurgy Research Institute School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China

Sulphur(S)-template method based on conventional slurry-casting method has been developed to pro-duce porous silicon(Si)*** facile fabrication technology is suitable for current production line and expected to be widely applied to various electrode materials under large volume change during ***,S particles as template agent are mixed with active material Si,carbon conductor and binder forming uniform *** casting and drying,the electrodes are immersed in carbon disul-fide solution to remove S particles rapidly,generating pores in-situ at the original position of S *** analysis shows that the pores inside electrodes are able to shorten lithium ion diffusion paths,reduce normal expansion rate and decrease formation of cracks in the Si electrode(2 mg_(Si)/cm^(2)),demonstrating a reversible capacity of 951 mAh/g at 0.5 A/g after 100 cycles(with a capacity retention of 99.5%)and a capacity of-826 mAh/g at 2 A/g.

关键词： Sulphur-template Porous electrodes Silicon anodes Low volume expansion Lithium-ion batteries

Inhibition effect of small interfering RNA of connective tissue growth factor on the expression of vascular endothelial growth factor and connective tissue growth factor in cultured human peritoneal mesothelial cells

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Chinese Medical Journal 2007年第3期120卷 231-236页

作者： LIU Fu-you xiao Li peng you-ming DUAN Shao-bin LIU Hong LIU Ying-hong LING Gui-hui YUAN Fang CHEN Jun-xiang FU xiao ZHU Jian-lian Division of Nephrology Second Affiliated Xiangya Hospital Central South University Changsha 410002 China

Background The peritoneum response to peritoneal dialysis can lead to fibrosis. The transforming growth factor β1 （TGF-β1 ） plays a key role in regulating tissue repair and remodelling after injury. Connective tissue growth factor （CTGF）, a downstream mediator of TGF-β1 inducing fibrosis, has been implicated in peritoneal fibrosis. Vascular endothelial growth factor （VEGF） plays a key role in angiogenesis that can hasten peritoneal fibrosis. In this study, we investigated the effect of small interfering RNA （siRNA） of CTGF by pRETRO-SUPER （PRS） retrovirus vector on the expression of CTGF and VEGF in human peritoneal mesothelial cells. Methods Retrovirus producing CTGF siRNA were constructed from the inverted oligonucleotides and transferred into packaging cell line PT67 with lipofectamine, and the virus supernatant was used to infect human peritoneal mesothelial cell （HPMC）. The cells were divided into seven groups： low glucose DMEM, low glucose DMEM ＋ TGF-β1 5 ng/ml, low glucose DMEM ＋ TGF-β1 5 ng/ml ＋ PRS-CTGF-siRNA1-4 and low glucose DMEM ＋ TGF-β1 5 ng/ml ＋ PRS. The expression of CTGF and VEGF were measured by semiquantitative RT-PCR and Western blot. Results Low levels of CTGF and VEGF were detected in confluent HPMCs. Following stimulation with TGF-β1 , the levels of CTGF and VEGF were significantly upregulated （P〈0.01）. Introduction of PRS-CTGF-siRNA1-4 resulted in the significant reduction of CTGF mRNA and protein, and VEGF mRNA （P〈0.01）, especially in groups PRS-CTGF-siRNA, and PRS-CTGF-siRNA4. The introduction of PRS void vector did not have these effects （P〉0.05）. Conclusions The expression of CTGF siRNA mediated by PRS retrovirus vector can effectively reduce the level of CTGF and VEGF induced by TGF-β1 in cultured HPMCs. This study may provide potential therapeutic strategies to prevent the peritoneal fibrosis.

关键词： peritonealfibrosis connective tissue growth factor vascular endothelial growth factor,RNA, small interfering