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Heterostructured MoS2/GPC anode: the synergistic lithium storage performance and lithiation kinetics
Zhang Xia Dong Chaoyang Sun Yangang Liu Binyang Sun Lili Lu Yongjuan Yu Jing Wei Yajun Xu Yuandong 《Journal of Solid State Electrochemistry》2022,26(2):491-501
Journal of Solid State Electrochemistry - Grapefruit peel carbon (GPC) is prepared from waste grapefruit peel and further used as substrate for in situ construction of MoS2 arrays, forming MoS2/GPC... 相似文献
2.
通过讨论向量布尔函数零化子的代数次数,对向量布尔函数的代数免疫性质进行研究,得出其置换不变性,即在输入变量作仿射变换和输出变量作置换之后仍然保持不变,并得出向量布尔函数代数免疫与线性组合函数重量、Walsh谱以及非线性度之间的关系. 相似文献
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ZHANG Changwen LI Hua DONG Jianmin WANG Yongjuan PAN Fengchun ZHANG Jian GUO Yongquan & LI Wei . School of Physics Microelectronics Shandong University Jinan China . Institute of Functional Materials Central Iron Steel Research Institute Beijing China 《中国科学G辑(英文版)》2005,48(3)
1 Introduction The rare-earth transition-metal intermetallic compounds have been widely investi-gated for many years, among them the Sm-Co series compounds with 1:5 and 2:17 crys-tal structures. These compounds have been used as sintered and bonded permanent magnets since the 1960s[1,2]. Interest recently has been focused on the TbCu7-type struc-ture Sm-Co intermetallic compounds with a strong uniaxial magnetocrytalline anisot-ropy and a low temperature coefficient (β = ?0.11%)[3―6] due t… 相似文献
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Zhizhong Wang Yongjuan Chang Xinxin Gong Liyi Dai 《International journal of quantum chemistry》2012,112(3):647-652
Meyer–Schuster rearrangements of 2‐phenyl‐3‐butyn‐2‐ol with H3O+ and (H2O)6 model in high‐temperature water (HTW) have been investigated by the use of density functional theory calculations. In the substrate 2‐phenyl‐3‐butyn‐2‐ol catalyzed by H3O+ and (H2O)6, the Meyer–Schuster rearrangements were predicted by the frontier molecular orbital theory. The results show that the rearrangement does not involve the carbonium ion intermediates, but the first transition state is carboniumion like. Dehydration and hydration may occur via the intermolecular proton relay along the hydrogen‐bond chains and the second step of reaction path is a total acid–base catalytic process. Based on the results, a model considered both HTW ambient and water molecules are proposed to represent mechanisms of other reactions in HTW. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2011 相似文献
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The electrochemical reduction reaction of dissolved oxygen on Q235 carbon steel in alkaline solution containing chloride ions 总被引:1,自引:0,他引:1
Yongjuan Li Jiajia Wu Dun Zhang Yi Wang Baorong Hou 《Journal of Solid State Electrochemistry》2010,14(9):1667-1673
Cyclic voltammetry, electrochemical impedance spectroscopy, and rotating disk electrode voltammetry have been used to study
the effect of chloride ions on the dissolved oxygen reduction reaction (ORR) on Q235 carbon steel electrode in a 0.02 M calcium
hydroxide (Ca(OH)2) solutions imitating the liquid phase in concrete pores. The results indicate that the cathodic process on Q235 carbon steel
electrode in oxygen-saturated 0.02 M Ca(OH)2 with different concentrations of chloride ions contain three reactions except hydrogen evolution: dissolved oxygen reduction,
the reduction of Fe(III) to Fe(II), and then the reduction of Fe(II) to Fe. The peak potential of ORR shifts to the positive
direction as the chloride ion concentration increases. The oxygen molecule adsorption can be inhibited by the chloride ion
adsorption, and the rate of ORR decreases as the concentration of chloride ions increases. The mechanism of ORR is changed
from 2e− and 4e− reactions, occurring simultaneously, to quietly 4e− reaction with the increasing chloride ion concentration. 相似文献
7.
Xu Meng Yongjuan Lu Xiaoliang Zhang Baoping YangGewen Yi Junhong Jia 《Applied Surface Science》2011,258(2):649-656
In an effort to explore the optoelectronic properties of nanostructured indium sulfide (In2S3) thin films for a wide range of applications, the In2S3 thin films were successfully deposited on the APTS layers (-NH2-terminated) modified ITO glass substrates using the chemical bath deposition technique. The surface morphology, structure and composition of the resultant In2S3 thin films were characterized by FESEM, XRD, and XPS, respectively. Also, the correlations between the optical properties, photocurrent response and the thickness of thin films were established. According to the different deposition mechanisms on the varying SAMs terminational groups, the positive and negative micropatterned In2S3 thin films were successfully fabricated on modified Si substrates surface combining with the ultraviolet lithography process. This offers an attractive opportunity to fabricate patterned In2S3 thin films for controlling the spatial positioning of functional materials in microsystems. 相似文献
8.
采用近红外光谱技术,研究了季铵盐Gemini表面活性剂C12-S2-C12.2Br/氯仿体系中反胶团的增溶水状态,使用Peakfit解峰技术,将水的近红外光谱分为3个亚带,分别对应分散于溶剂中的水、反胶团中的类似本体水和结合水。将以上3种状态的水换算成每个表面活性剂分子对应的各种状态水分子数,即分散在溶剂中的水ns、类似本体水nf和结合水nb。向C12-S2-C12.2Br/氯仿体系中加入不同头基的离子型表面活性剂十二烷基三甲(乙)基溴化铵(DTAB、DTEB),发现随着添加剂摩尔分数αA的增大,ns和nb增大,nf减小。加入非离子表面活性剂聚乙二醇辛基苯基醚(OP-10),随着αA的增大ns减小,nb增大,nf略有增大趋势。可见加入表面活性剂头基的大小、所带电荷以及亲水性等均会对反胶团的增溶水能力和状态产生影响。 相似文献
9.
Changwen?Zhang Hua?LiEmail author Jianmin?Dong Yongjuan?Wang Fengchun?Pan Jian?Zhang Yongquan?Guo Wei?Li 《中国科学G辑(英文版)》2005,48(3):325-335
The electronic density of states, spin-splittings and atomic magnetic moments of SmCO7-compound have been studied using spin-polarized MS-Xα method. The results show that a few of electrons are transferred to
Sm(5d0) orbital because of orbital hybridization between Sm and Co atoms in the compound. The exchange interactions between 3d and
5d electrons lead to the magnetic coupling between Sm and Co, and therefore, result in the long-range ferromagnetic order
inside the SmCo7 compound. There are negative exchange couplings occurring at some levels, which weakens the strength of average coupling
around Co lattice. So, the Curie temperature and Co-moment of SmCo7-decrease distinctly compared with pure Co. Compared with SmCo5 compound, the disordered substitution of Co-Co “dumbbell-atom” pairs for Sm changes the local environment of Co lattice,
which makes the 2e site bear negative magnetic moment. The strength of hybridization near Fermi level weakens and the free
energy of the compound increases obviously. Thus, SmCo7 is a metastable compound at room temperature. Considering the localization of 4f electrons and a few of 5d electrons arising
from the orbital hybridization, the magnetic moment of Sm atom will be 1.61μB in SmCo7 compound, which is in agreement with the experimental values of Sm3+ ion-moment and Sm atom-moment in metals. 相似文献
10.
Chen Y Hu S Liu W Chen X Wu L Wang X Liu P Li Z 《Dalton transactions (Cambridge, England : 2003)》2011,40(11):2607-2613
Cubic ZnIn(2)S(4) nanoparticles and hexagonal ZnIn(2)S(4) flower-like microspheres were controlled synthesized via a facile hydrothermal method by simply changing the metal precursors. The as-prepared samples were characterized by XRD, SEM, TEM and UV-vis DRS. It was found that the metal precursors influenced the final ZnIn(2)S(4) polymorphs, i.e., metal nitrates led to the formation of cubic ZnIn(2)S(4), while metal chlorides resulted in the formation of the hexagonal phase. The formation processes of the cubic ZnIn(2)S(4) nanoparticles and hexagonal ZnIn(2)S(4) flower-like microspheres were investigated and the mechanism of the phase formation was proposed. Although both cubic and hexagonal ZnIn(2)S(4) polymorphs exhibited photocatalytic activity for the degradation of methyl orange (MO) under visible light irradiation, the photocatalytic performances over cubic and hexagonal ZnIn(2)S(4) were different. 相似文献