检索结果-南通市图书馆

Extended light absorption and accelerated charge migration in ultrathin twisted carbon nitride nanoplates for efficient solar hydrogen production

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第7期67卷 2215-2223页

作者： Yanmin Zou Shiyao Li Dandan Zheng jianyong feng Sibo Wang Yidong Hou Guigang Zhang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350108China College of Environment and Safety Engineering Fuzhou UniversityFuzhou 350108China Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water ***,pristine carbon nitride prepared by traditional solid-state polymerization usually encounters issues such as rapid carrier recombination and insufficient absorption of visible light below 460 ***,poly(heptazine imide)with a distinctive nanoplate structure was synthesized in a binary molten salt of NaCl–CaCl_(2).The salt template allows the formation of the thin nanoplate structure,which promotes the charge separation and ***,the intercalation of Ca^(2+)ions between the conjugated layers endows the activation of n–π*electron transition due to the distortion of in-plane heptazine ***,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from *** work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide).

关键词： photocatalysis poly heptazine imide nanoplates ion intercalation hydrogen production

统一大市场促进各民族交往交流交融——理论阐释与中国实践

在线全文

学校读者我要写书评

暂无评论

西北民族研究 2024年第2期 132-142页

作者：冯建勇屠乐炎浙江师范大学马克思主义学院金华321004 浙江师范大学人文学院金华321004

马克思主义共同体理论认为,从“自然的共同体”到“虚幻的共同体”的发展打破民族藩篱,世界市场的形成与民族隔阂的消失则是建立“真正的共同体”的前提。与之相对应,马克思主义经典作家强调世界经济和统一大市场对于促进各民族交往交... 详细信息

马克思主义共同体理论认为,从“自然的共同体”到“虚幻的共同体”的发展打破民族藩篱,世界市场的形成与民族隔阂的消失则是建立“真正的共同体”的前提。与之相对应,马克思主义经典作家强调世界经济和统一大市场对于促进各民族交往交流交融和构建民族共同体的积极作用,从而在生产力、统一市场与民族共同体建设之间建立一种因果逻辑关系。中华民族区域内的统一大市场历史悠久,在特定时期内促进了各民族交往交流交融。进入新时代,党中央高度重视统一大市场建设,提出并实施一系列重大战略举措以加强统一大市场建设,这必将促进各民族交往交流交融,铸牢中华民族共同体意识。

关键词：交往交流交融统一大市场马克思主义共同体理论中国实践

在线全文

学校读者我要写书评

暂无评论

热催化活性差的过渡金属用于光驱动裂解氨

Science Bulletin 2024年第1期69卷 1-2页

作者：柳建明冯建勇邹志刚李朝升 National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Jiangsu Key Laboratory for Nano Technology Nanjing UniversityNanjing 210093China

As a zero-or near zero-emission energy carrier,hydrogen,especially"green hydrogen"from renewable energy and water,is the key piece for decarbonizing existing energy systems and transiting into a carbon-neutral world[1,2].Unfortunately,challenges associated with storage and transportation greatly restrict the large-scale application of hydrogen energy,which requires the development of efficient hydrogen storage materials[3-5].Among the various proposed candidates,ammonia(NH_(3))is regarded as a promising hydrogen carrier owing to its low carbon footprint,high gravimetric/volumetric hydrogen storage capacity,easy liquidation,safe storage and transportation,and well-developed synthesis approach at the industrial scale[6-8].

关键词：过渡金属光驱动 carbon

在线全文

学校读者我要写书评

暂无评论

大传输距离下电动汽车无线充电系统优化

北京工业大学学报 2024年第4期50卷 405-416页

作者：李延杰李峰周思齐马晓磊冯建勇霍栩北京航空航天大学交通科学与工程学院北京100191 车路协同与安全控制北京市重点实验室北京100191 北京路桥瑞通养护中心有限公司北京101300 北京昌开建设工程管理有限责任公司北京102299

针对无线充电系统原边线圈嵌入路面结构后耦合线圈之间的距离增大、耦合程度减弱的问题,对线圈结构进行优化,以实现大传输距离下无线电能的传输。通过电磁有限元仿真对线圈的内径、外径和匝数进行优化,提出以耦合系数为优化目标的线圈... 详细信息

针对无线充电系统原边线圈嵌入路面结构后耦合线圈之间的距离增大、耦合程度减弱的问题,对线圈结构进行优化,以实现大传输距离下无线电能的传输。通过电磁有限元仿真对线圈的内径、外径和匝数进行优化,提出以耦合系数为优化目标的线圈结构参数优化流程,同时,在Simulink中搭建无线充电系统的电路仿真平台,对采用优化后线圈结构的无线充电系统性能进行测试。结果表明:随着线圈内径增大,耦合系数先增大,达到峰值后迅速减小;随着线圈外径增大,耦合系数逐渐增大;在不同外径下,线圈的最优匝数均为9匝;3个参数中,增大外径是提高线圈耦合程度最有效的方式;最终优化后线圈的参数为外径480 mm、内径210 mm、匝数9匝,可以实现300 mm距离的电能传输,系统输出功率保持在2.96~3.70 kW,传输效率达到86.54%,横向容许偏移距离可达60 mm。

关键词：无线充电系统电动汽车无线电能传输(wireless power transfer,WPT) 耦合线圈大传输距离磁耦合谐振

原位聚合法制备蚕丝导电心肌补片及其性能表征

在线全文

学校读者我要写书评

暂无评论

上海纺织科技 2024年第4期52卷 86-91页

作者：杨晓园冯建永奚晓青浙江理工大学纺织科学与工程学院(国际丝绸学院) 浙江杭州310018 浙江省医疗器械安全性评价研究重点实验室浙江杭州310018

通过原位聚合法工艺,利用聚吡咯和还原氧化石墨烯对蚕丝织物进行导电整理,制得蚕丝导电心肌补片,并探讨其优化整理工艺。测试结果表明:导电心肌补片表面的导电颗粒随吡咯单体和氧化石墨烯质量浓度上升而增多,其电导率也随之提高;表面电... 详细信息

通过原位聚合法工艺,利用聚吡咯和还原氧化石墨烯对蚕丝织物进行导电整理,制得蚕丝导电心肌补片,并探讨其优化整理工艺。测试结果表明:导电心肌补片表面的导电颗粒随吡咯单体和氧化石墨烯质量浓度上升而增多,其电导率也随之提高;表面电阻随着吡咯单体浓度增加而降低,原位聚合的吡咯单体最佳质量浓度为1 g/L,氧化石墨烯最佳质量浓度为8 g/L;聚吡咯和还原氧化石墨烯可以很好地聚合在蚕丝织物表面;随着原位聚合质量浓度的增加,导电心肌补片的热学性能、降解率有所提高,杨氏模量呈下降趋势。综合分析认为:利用原位聚合法制备蚕丝导电心肌补片具有很好的可行性。

关键词：蚕丝织物医用织物原位聚合法聚吡咯还原氧化石墨烯导电心肌补片

In situ optical spectroscopic understanding of electrochemical passivation mechanism on sol–gel processed WO_(3) photoanodes

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第8期31卷 20-28,I0002页

作者： jianyong feng Xin Zhao Bowei Zhang Zhong Chen Zhaosheng Li Yizhong Huang Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093JiangsuChina School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

A prevailing understanding on electrochemical activation of photoelectrodes is that electrochemical treatment leads to increased charge carrier densities thereby improved photoelectrode *** to this understanding,in this study enhanced photoactivity of WO_(3) photoanode upon electrochemical treatment is ascribed to an extraordinary mechanism of surface trap *** associated mechanism is analyzed by in situ optical spectroscopy,using which the optical property changes of WO_(3) electrode during electrochemical treatment are *** results suggest surface W^(5+)species,the origin of surface traps on WO_(3) photoanodes,are converted to W^(6+) ions by electrochemical *** study demonstrates the particular ability of the electrochemical strategy to passivate surface traps of photoanodes,and also shows the advantages of in situ optical spectroscopy to investigate the real-time electronic structure variations of electrodes during electrochemical treatment.

关键词： In situ optical spectroscopy Electrochromism Surface trap Solar water splitting Tungsten oxide Hydrogen

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第6期7卷 1059-1067页

作者： Ningsi Zhang Xin Wang jianyong feng Huiting Huang Yongsheng Guo Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Nanjing University Jiangsu Key Laboratory of Nano Technology Nanjing University

Although β-Fe2O3has a high theoretical solar-to-hydrogen efficiency because of its narrow band gap, the study of β-Fe2O3photoanodes for water splitting is elusive as a result of their metastable nature. Raman identification of β-Fe2O3is theoretically and experimentally investigated in this study for the first time, thus clarifying the debate about its Raman spectrum in the literature. Phase transformation of β-Fe2O3toα-Fe2O3was found to potentially take place under laser and electron irradiation as well as ***, phase transformation of β-Fe2O3to α-Fe2O3was inhibited by introduction of Zr doping, andβ-Fe2O3was found to withstand a higher annealing temperature without any phase transformation. The solar water splitting photocurrent of the Zr-doped β-Fe2O3photoanode was increased by 500% compared to that of the pure β-Fe2O3photoanode. Additionally, Zr-doped β-Fe2O3exhibited very good stability during the process of solar water splitting. These results indicate that by improving its thermal stability,metastable β-Fe2O3film is a promising photoanode for solar water splitting.

关键词： solar energy conversion metastable phase phase transformation iron oxide photoelectrochemical water splitting

Exploring facile strategies for high-oxidation-state metal nitride synthesis: carbonate-assisted one-step synthesis of Ta_3N_5 films for solar water splitting

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2018年第21期63卷 1404-1410页

作者： Tao Fang Huiting Huang jianyong feng Yingfei Hu Yongsheng Guo Shiying Zhang Zhaosheng Li Zhigang Zou Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State Microstructures Department of Physics Nanjing University College of Engineering and Applied Sciences Nanjing University Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha University

Metal nitrides are widely studied due to their outstanding physical properties, including high hardness,high thermal and chemical stability, low electrical resistivity etc. Generally, metal nitrides can be obtained from the direct reaction of metal and ammonia/nitrogen. However, some of the metal nitrides,such as Ta_3N_5, cannot be synthesized by direct nitridation of metals. To achieve Ta_3N_5, high-oxidationstate Ta precursors like Ta_2O_5, NaTaO_3, TaS_3, K_6Ta_(10.8)O_(30), Ta(N(CH_3)_2)_5 and TaCl_5 have to be employed,which is a time-consuming and laborious process with the possibility of introducing undesirable impurities. Here taking Ta_3N_5 as an example, a facile carbonate-assisted one-step nitridation method is proposed, which enables the direct synthesis of high-oxidation-state metal nitride films from metal precursors under ammonia flow. The mechanism of the nitridation process has been studied, which carbon dioxide released from carbonates decomposition reacts with metallic Ta and assists the one-step conversion of metallic Ta to Ta_3N_5. The as-prepared Ta_3N_5 film, after modified with NiFe layered double hydroxide, exhibits promising water splitting performance and stability. This method avoids the preoxidation process of metal precursors in high-oxidation-state metal nitride synthesis, and may facilitate the direct fabrication of other important metal nitrides besides Ta_3N_5.

关键词： Metal nitrides Carbonate-assisted One-step conversion Ta3N5 films Photoelectrochemical Solar water splitting

双氢青蒿素通过促进骨髓间充质干细胞归巢治疗小鼠前列腺炎的研究

在线全文

学校读者我要写书评

暂无评论

中药药理与临床 2024年第6期40卷 45-50页

作者：郭阔周岩王军浩韩建鹏冯建勇王任陈文彬李永章河北省中医院泌尿外科石家庄050011

目的:探讨双氢青蒿素对非细菌性前列腺炎(Chronic non-bacterial prostatitis,CNP)的治疗效果及其对骨髓间充质干细胞(BMSCs)归巢的影响。方法:选取30只9~11 w龄雄性C57BL/6小鼠,随机抽取6只作为正常对照组,剩余24只注射消痔灵建立慢性... 详细信息

目的:探讨双氢青蒿素对非细菌性前列腺炎(Chronic non-bacterial prostatitis,CNP)的治疗效果及其对骨髓间充质干细胞(BMSCs)归巢的影响。方法:选取30只9~11 w龄雄性C57BL/6小鼠,随机抽取6只作为正常对照组,剩余24只注射消痔灵建立慢性非细菌性前列腺炎小鼠模型。将造模成功后的小鼠随机分为模型对照组、骨髓间充质干细胞组、双氢青蒿素5 mg/kg+骨髓间充质干细胞组和双氢青蒿素15 mg/kg+骨髓间充质干细胞组,每组6只。采用膀胱穿刺测压法行小鼠膀胱排尿功能检测;免疫荧光法检测红色荧光蛋白(RFP)阳性细胞在前列腺组织中的表达情况;HE染色检测小鼠前列腺组织病理状态;天狼星红染色检测小鼠前列腺组织胶原累积情况;ELISA法检测小鼠前列腺组织炎性因子肿瘤坏死因子α(TNF-α)、白介素(IL)-1β和趋化因子COX2、CXCL9、CXCL10、CXCL11的含量。结果:膀胱穿刺测压法结果显示,与正常对照组相比,模型对照组和骨髓间充质干细胞组小鼠膀胱最大容量(v_(m))和最大排尿压力(P_(MV))降低,残余尿量(v_(R))增加,CNP小鼠膀胱组织大部分腺体炎细胞浸润,胶原积累增多,前列腺组织TNF-α、IL-1β、COX2、CXCL9、CXCL10、CXCL11含量明显增加(P<0.05或P<0.01);与模型对照组相比,双氢青蒿素各组v_(m)和P_(MV)均增加,v_(R)减少;腺体炎细胞浸润和胶原积累减少;双氢青蒿素5 mg/kg+骨髓间充质干细胞组前列腺组织TNF-α、IL-1β、COX2、CXCL11的含量明显降低,双氢青蒿素15 mg/kg+骨髓间充质干细胞组前列腺组织TNF-α、IL-1β、COX2、CXCL9、CXCL10、CXCL11的含量明显降低(P<0.05或P<0.01)。结论:双氢青蒿素治疗可剂量依赖性地促进骨髓间充质干细胞的归巢,改善小鼠的CNP相关症状,降低CNP小鼠前列腺组织炎症水平和纤维组织增生,降低炎性因子和趋化因子的水平。双氢青蒿素和骨髓间充质干细胞联合治疗可极大改善CNP病情。

关键词：双氢青蒿素非细菌性前列腺炎骨髓间充质干细胞排尿功能