检索结果-南通市图书馆

Accurate studies on the full vibrational energy spectra and molecular dissociation energies for some electronic states of N_(2.molecule

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2005年第4期48卷 385-398页

作者： ren weiyi1,2. sun weiguo1, HOU Shilin3 & FENG Hao4 1. Institute of Physics,{2., sichuan university, chengdu 610065, china 2. Institute of Theoretical Physics, Xihua Normal university, Nanchong 637002. china 3. Department of Physics, china Oceanography university, Qingdao 2.6003, china 4. college of Physics, sichuan university, chengdu 610065, china 1. Institute of Physics College of Chemical Engineering Sichuan University 610065 Chengdu China 2. Institute of Theoretical Physics Xihua Normal University 637002 Nanchong China 3. Department of Physics China Oceanography University 266003 Qingdao China 4. college of Physics Sichuan University 610065 Chengdu China

It is usually very difficult to directly obtain molecular dissociation energy De and all accurate high-lying vibrational energies for most diatomic electronic states using modern experimental techniques or quantum theories, and it is also very difficult to give accurate analytical expression for diatomic molecular dissociation energy. This study proposes a new analytical formula for obtaining accurate molecular dissociation energy based on the LeRoy and Bernstein’s energy expression in dissociation limit. A set of full vibrational energy spectra for some electronic states of N2.molecule are studied using the algebraic method (AM) suggested recently, and the corresponding accurate molecular dissociation energies are evaluated using the proposed new formula and high-lying AM vibrational energies. The results show that the AM spectra and the new theoretical dissociation energies agree excellently with experimental data, and thereby providing a new physical approach to generating accurate dissociation energies for electronic states of diatomic molecules.

关键词： vibrational energy, dissociation energy, nitrogen molecule, algebraic method.

Synthesis and Luminescence Properties of Red Phosphor CaO:Eu^(3+)

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2009年第1期24卷 20-24页

作者：康明 School of Material Science and engineering Southwest University of Science and Technology college of Materials Science and engineering Sichuan University

Ca（NO3）2.4H2., Eu（NO3）3 and H2.2.4·2.2. were adopted to synthesize CaO： Eu3＋ with the chemical co-precipitation method, and the effects of the calcination temperature and Eu3＋ doping concentration on the phosphor structure and its luminescent properties were investigated by TG-SDTA, XRD, and PL-PLE. The results confirm that the Eu3＋ ions as luminescent centers substi-tutes Ca2. sites without changing the crystal structure of cubic CaO. The optimum calcination tem-perature and the optimum concentration of Eu3＋ are 1 100 ℃ and 1 mol%, respectively, under which the best crystallinity and highest PL intensity appeared. The maximum emission wavelength is 592.nm （5D0→7F1） which is excited by xenon lamp with the wavelength of 2.0-2.0 nm, indicating that the Eu3＋ ion mainly locates in the symmetric position （Oh） in the crystal lattice of CaO.

关键词： red phosphor CaO Eu^3+ co-precipitation method rare earths

在线全文

学校读者我要写书评

暂无评论

用能量自洽法研究异核双原子分子的势能曲线

物理学报 2003年第2期52卷 307-311页

作者：李新喜孙卫国冯灏四川大学化学工程学院成都610065 四川大学原子与分子物理研究所

用研究双原子分子解析势能函数的新方法———ECM方法进一步研究了一些异核双原子分子的电子基态和激发态 :CIF分子的A3Π1 和B0 + (3Π)态 ,CH分子的X2.Π态 ,BH分子的X1 Σ+ 态 ,XeO分子的d1 Σ+ 态 ,LaF分子的X1 Σ+态 ,Li7D分子的X1... 详细信息

用研究双原子分子解析势能函数的新方法———ECM方法进一步研究了一些异核双原子分子的电子基态和激发态 :CIF分子的A3Π1 和B0 + (3Π)态 ,CH分子的X2.Π态 ,BH分子的X1 Σ+ 态 ,XeO分子的d1 Σ+ 态 ,LaF分子的X1 Σ+态 ,Li7D分子的X1 Σ+ 态 ,NaRb分子的X1 Σ+ 态 ,KRb分子的 (2.) 3Σ+ 和 2.1 Π态等 .获得的势能曲线表明 ,ECM势能很好地符合Rydberg Klein Rees(RKR)值 ,得到了比Morse势 ,huxley Murrell Sorbie(HMS)势更令人满意的结果 .而且在分子渐近区和分子离解区域 ,ECM方法还能得到RKR可能缺乏的可靠物理数据 .

关键词：热能曲线能量自洽双原子分析势能函数电子态 ECM

Long-lifespan thin Li anode achieved by dead Li rejuvenation and Li dendrite suppression for all-solid-state lithium batteries

在线全文

学校读者我要写书评

暂无评论

Chinese chemical Letters 2024年第10期35卷 530-536页

作者： Xuejie Gao Xinyang Chen Ming Jiang Hanyan Wu Wenfeng ren Xiaofei Yang Runcang sun Center for Lignocellulosic Chemistry and Biomaterials College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China Division of Energy Storage Dalian National Laboratoryfor Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023 China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China

Solid polymer electrolytes(SPEs)are considered to be one of the most promising systems applied in all-solid-state lithium metal batteries(ASSLMBs)on account of their chemical and electrochemical ro bustness,mechanical stability,cost-effective and scalable manufacturing ***,significant en deavors have been directed towards mitigating the formation of the Li dendrite in SPE-based ASSLMBs while research on the inactive lithium in the forms of the solid-electrolyte interface has been rarely re ***,a bi-functional GaI3additive is developed for in-situ generating Li_(3)Ga alloy for suppressing Li dendrite growth,as well as I3-in recovering dead *** on the density functional theory(DFT)results,the Li atom prefers to deposit on the Li_(3)Ga surface and then guide uniform Li deposi tion,while the I3species features a relatively lower lowest unoccupied molecular orbital(LUMO)energy level(-2.12.e V),meaning a higher electron affinity,which is beneficial for reviving inactive lithium to counterbalance the loss of *** a result,in comparison to cells employing pure PEGDME-based electrolytes,the Li-Li symmetric cells utilizing GaI3-containing solid-state electrolyte exhibited a cycling life nearly 30 times longer at a cur{2.t density/capacity of 0.2.mA/cm^(2.,0.2.mAh/cm^(2..The full batterie of LFP//1%GaI3-SPE//40μm Li delivered a noteworthy capacity retention of 82.after 1300 cycles at a rate of 1 C.

关键词： Synergistic effect In-situ Li Ga alloy Suppress Lidendrite Dead lithium regeneration All-solid-state lithium metal batteries

Assessment of the conventional molybdenum-blue and magnesium-induced coprecipitation procedures in phosphorus measurement in various aquatic environments

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2010年第1期29卷 42-51页

作者： LIU Sumei ZHAO Yingfei ren Jingling ZHANG Jing sun San JIN Jie Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education College of Chemistry and Chemical Engineering Ocean University of Qingdao Qingdao 266100 China State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China

Phosphorus （P） is an essential nutrient utilized by all organisms for energy transport and growth. Both the conventional molybdenum-blue method and the magnesium-induced coprecipitation （MAGIC） procedures were applied for the measurement of dissolved inorganic phosphorus （DIP） and total dissolved phosphorus （TDP） in more than 840 water samples collected between 2.03 and 2.05, including seawater （the Huanghai Sea, the East china Sea, and the northern South china Sea）, water from rivers and estuaries （the Changjiang, the Huanghe, and the major rivers emptying into the Jiaozhou Bay）, groundwater （in the drainage basin surrounding the Jiaozhou Bay）, rain-water, and aquaculture water samples. The MAGIC method allows the investigation of phosphorus distributions and cycling for systems in which DIP is below the detection limits of conventional methods. Comparison between the two methods demonstrated that the concentrations obtained with both methods were significantly correlated. The diffe{2.ces of DIP and TDP concentrations measured with the two methods were higher when the concentrations of DIP and TDP were lower, implying the lower reproducibility at low concentrations. The concentration diffe{2.ces increase with the increase in the proportion of DOP in TDP, which indicates that the discrepancy of DIP concentrations measured with the two methods increases when the DOP concentration is high. The discrepancies indicated that the composition of P compounds differs depending on sample sources and water type; it would be useful to infer the presence of diffe{2.t phosphorus compound pools from diffe{2.ces between the two methods. This study indicates the potential presence of a pool of alkaline-labile compounds for samples from rainwater and rivers and estuaries surrounding the Jiaozhou Bay; the potential presence of acid-labile compounds that were adsorbed by Mg（OH）2.for samples from the Changjiang Estuary, Huanghai Sea, East china Sea, and groundwater; the potential presen

关键词： phosphorus magnesium-induced coprecipitation conventional blue phosphomolybic acid assay various aquatic environments

Surface-derived phosphate layer on NiFe-layered double hydroxide realizes stable seawater oxidation at the current density of 1 A·cm^(−2.

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 5786-5794页

作者： Chaoxin Yang Zhengwei Cai Jie Liang Kai Dong Zixiao Li Hang sun Shengjun sun Dongdong Zheng Hui Zhang Yongsong Luo Yongchao Yao Yan Wang Yuchun {2. Qian Liu Luming Li Wei Chu Xuping sun Bo Tang college of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Department of Science and Environmental Studies Faculty of Liberal Arts and Social Sciencethe Education University of Hong KongHong Kong 999077China Institute for Advanced Study Chengdu UniversityChengdu 610106China Laoshan Laboratory Qingdao 266237China

Seawater electrolysis,especially in coastlines,is widely considered as a sustainable way of making clean and high-purity H2.from renewable energy;however,the practical viability is challenged severely by the limited anode durability resulting from side reactions of chlorine ***,we report an effective Cl^(−) blocking barrier of NiFe-layer double hydroxide(NiFe-LDH)to harmful chlorine chemistry during alkaline seawater oxidation(ASO),a pre-formed surface-derived NiFe-phosphate(Pi)***,the PO_(4)^(3−)-enriched outer-layer is capable of physically and electrostatically inhibiting Cl−adsorption,which protects active Ni^(3+)sites during *** NiFe-LDH with the NiFe-Pi outer-layer(NiFe-LDH@NiFe-Pi)exhibits higher current densities(j)and lower overpotentials to afford 1 A·cm^(−2.(η1000 of 370 mV versusη1000 of 42. mV)than the NiFe-LDH in 1 M KOH+***,the NiFe-LDH@NiFe-Pi also demonstrates longer-term electro{2. durability than NiFe-LDH,attaining 100-h duration at the j of 1 A·cm^(−2..Additionally,the importance of surface-derived PO_(4)^(3−)-enriched outer-layer in protecting the active centers,γ-NiOOH,is explained by ex situ characterizations and in situ electro{2. spectroscopic studies.

关键词： seawater oxidation phosphate outer-layer layered double hydroxide electrostatic repulsion in situ Raman

TiCl_4水解制备纳米TiO_2.膜的研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

四川大学学报（自然科学版） 2003年第4期40卷 745-748页

作者：任成军钟本和四川大学化学学院成都610064 四川大学化学工程学院成都610065

TiCl4水解在玻璃基质上成功地制备了粒径在2.～50nm的锐钛型TiO2.膜光催化甲基橙溶液实验测试了TiO2.膜的光催化活性实验结果表明:镀膜次数越多,光催化活性越高,当镀膜达5次时,光降解率为92.67% 负载型SnO2.TiO2.膜较纯TiO2.膜催... 详细信息

TiCl4水解在玻璃基质上成功地制备了粒径在2.～50nm的锐钛型TiO2.膜光催化甲基橙溶液实验测试了TiO2.膜的光催化活性实验结果表明:镀膜次数越多,光催化活性越高,当镀膜达5次时,光降解率为92.67% 负载型SnO2.TiO2.膜较纯TiO2.膜催化性能明显提高 TiO2.膜经稀酸置换后,光催化效果得到改善紫外可见分光光度计测得薄膜在波长600～800nm范围内透光率为60～75%

关键词：纳米TiO2.膜 TiCl4 光催化掺SnO2 表面酸处理

Reply to Comment on“chemical vapor deposition synthesis and Raman scattering investigation of quasi-one-dimensional ZrS_(3) nanoflakes”

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8649-8650页

作者： Yang Chen Yuanyuan Jin Junqiang Yang Yizhang ren Zhuojun Duan Xiao Liu Jian sun Song Liu Xukun Zhu Xidong Duan Institute of chemical Biology and Nanomedicine(ICBN) College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China School of Physics and Electronics Central South UniversityChangsha 410083China

1 Introduction Thanks very much for *** taking time to comment on our recent paper regarding“chemical vapor deposition synthesis and Raman scattering investigation of quasi-one-dimensional ZrS_(3) nanoflakes”.We summarize the suggestions of *** as made in the comment[1].First,*** suggested that there are just three peaks of two S 2. doublets in Fig.2.b)in the original paper[1],which is inconsistent to the four peaks of previous reports[2.4].Second,*** mentioned that the ratio of two S 2. doublets is helpful to identify the sulfur vacancies,which have a great impact on the n-type semiconducting nature of ZrS_(3).Third,*** mentioned that Zr 3d peak appearing at 184.7 eV is wider than previous reports[2.4],which may be accounted by the appearance of ZrS_(2.O,and Zr remains in the tetravalent state.

关键词： state. synthesis quasi

Building Fe atom–cluster composite sites using a site occupation strategy to boost electrochemical oxygen reduction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2024年第3期6卷 276-286页

作者： Tingyi Zhou Yi Guan Changjie He Lei Zhang Xueliang sun Zhongxin Song Qianling Zhang Chuanxin He Xiantao Jiang Zhaoyan Luo Wei Xing Xiangzhong ren college of Chemistry and Environmental engineering Shenzhen UniversityShenzhenGuangdongChina Department of Mechanical and Materials engineering University of Western OntarioLondonOntarioCanada State Key Laboratory of Electroanalytical Chemistry Jilin Province Key Laboratory of Low Carbon Chemical PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesJilinChangchunChina

The high-temperature pyrolysis process for preparing M–N–C single-atom catalyst usually results in high heterogeneity in product structure concurrently contains multiscale metal phases from single atoms(SAs),atomic clusters to ***,understanding the interactions among these components,especially the synergistic effects between single atomic sites and cluster sites,is crucial for improving the oxygen reduction reaction(ORR)activity of M–N–C ***,herein,we constructed a model catalyst composed of both atomically dispersed FeN4 SA sites and adjacent Fe clusters through a site occupation *** found that the Fe clusters can optimize the adsorption strength of oxygen reduction intermediates on FeN4 SA sites by introducing electron-withdrawing–OH ligands and decreasing the d-band center of the Fe *** as-developed catalyst exhibits encouraging ORR activity with halfwave potentials(E1/2.of 0.831 and 0.905 V in acidic and alkaline media,***,the catalyst also represents excellent durability exceeding that of Fe–N–C SA *** practical application of Fe(Cd)–CNx catalyst is further validated by its superior activity and stability in a metalair battery *** work exhibits the great potential of synergistic effects between multiphase metal species for improvements of singleatom site catalysts.

关键词： d-band center metal clusters oxygen reduction reaction single-atom catalyst site occupations strategy