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p-Block elements for catalysis

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npj Computational Materials 2021年第1期7卷 1957-1958页

作者： zhen zhou Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001 HenanChina

Renewable energy applications largely rely on transition metal *** to organocatalysts,p-block elements exhibit transition-metal-like catalytic *** zhou and co-workers review the latest advances in p-block elements as catalysts for energy conversion to deeply understand the concept of metal-free catalysis and establish the design principles for p-block catalysts.

关键词： catalysis elements catalysts

MXene-based materials for electrochemical energy storage

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Journal of Energy Chemistry 2018年第1期27卷 73-85页

作者： Xu Zhang Zihe Zhang zhen zhou School of Materials Science and Engineering National Institute for Advanced Materials Institute of New Energy Material Chemistry Collaborative Innovation Centre of Chemical Science and Engineering(Tianjin) Nankai University

Rechargeable batteries and supercapacitors are widely investigated as the most important electrochemical energy storage devices nowadays due to the booming energy demand for electric vehicles and hand-held electronics. The large surface-area-to-volume ratio and internal surface areas endow two-dimensional（2D） materials with high mobility and high energy density; therefore, 2D materials are very promising candidates for Li ion batteries and supercapacitors with comprehensive investigations. In 2011, a new kind of 2D transition metal carbides, nitrides and carbonitrides, MXene, were successfully obtained from MAX phases. Since then about 20 different kinds of MXene have been prepared. Other precursors besides MAX phases and even other methods such as chemical vapor deposition（CVD） were also applied to prepare MXene, opening new doors for the preparation of new MXene. Their 2D nature and good electronic properties ensure the inherent advantages as electrode materials for electrochemical energy storage. In this review, we summarize the recent progress in the development of MXene with emphasis on the applications to electrochemical energy storage. Also, future perspective and challenges of MXene-based materials are briefly discussed regrading electrochemical energy storage.

关键词： MXene2D materials Electrochemical energy storage Batteries Supercapacitors

Cationic potential:An effective descriptor for rational design of layered oxides for sodium-ion batteries

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Green Energy & Environment 2021年第4期6卷 455-457页

作者： Xudong Zhao Li-zhen Fan zhen zhou Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Advanced Energy Materials and TechnologiesUniversity of Science and Technology BeijingBeijing100083China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou450001China

Sodium-ion batteries are very promising in large-scale energy *** exploration of Na layered oxides as cathode materials for Na ion batteries usually consumes much resource,while the performances of Na layered oxides are dominated by their crystal ***,it is highly desired to predict the stacking mode of the target oxides in advance:whether O3-type with higher ordered structure and stability,or P2-type with more Na *** this purpose density functional theory computations do not *** recently,Hu's group and international collaborators have proposed a cationic potential to provide a very timely,effective,and accurate criterion to predict the stacking mode of Na layered oxides(Science,370(2020)708-711).Under the guidance of the cationic potential phase map,Na layered oxides could be rationally *** we would like to highlight the progress that novel Na layered oxides could be obtained with the combination of large specific capacity,high power density and good cycling stability.

关键词： Na ion batteries Layered oxides Materials design

Recent progress of computational investigation on anode materials in Li ion batteries

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Frontiers of physics 2011年第2期6卷 197-203页

作者： Di-hua WU zhen zhou Institute of New Energy Material Chemistry College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry （Ministry of Education） Nankai University Tianjin 300071 China

Computations have been widely used to explore new Li ion battery materials because of its remarkable advantages. In this review, we summarize the recent progress on computational investigation on anode materials in Li ion batteries. By introducing the computational studies on Li storage capability in carbon nanotubes, graphene, alloys and oxides, we reveal that computations have successfully addressed many fundamental problems and are powerful tools to understand and design new anode materials for Li ion batteries.

关键词： Li ion batteries anode carbon nanotubes graphene computation

Defective/Doped Graphene-Based Materials as Cathodes for Metal-Air Batteries

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Energy & Environmental Materials 2022年第4期5卷 1103-1116页

作者： Qinming Zhang Chengyi Wang Zhaojun Xie zhen zhou School of Materials Science and Engineering Institute of New Energy Material ChemistryNankai UniversityTianjin 300350China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China

Graphene,as a proof-of-concept two-dimensional material,has proven to have excellent physical and chemical *** derivatives,such as defective or doped graphene,are also applied as catalytic materials for metal-air batteries(MABs).MABs have been recognized as possible candidates for new-generation energy storage systems due to their ultra-high theoretical energy *** far,graphene and its derivatives with optimized structures have been widely explored to improve the electrochemical performance in *** speaking,perfect graphene crystalline is inert for many catalytic processes,while defects and heteroatoms can endow graphene with high activity for many electrocatalytic *** this circumstance,recent progress is summarized for defective/doped graphene as air cathodes in aqueous or organic MABs,which are actually different electrochemical systems with distinct requirements for air ***,the relationship is clarified between graphene defects/doping and electrocatalytic mechanisms that can be the guidance for catalyst *** directions are also prospected for the development of graphene-based MAB cathodes.

关键词： defective/doped graphene electrocatalysts metal-air batteries OER ORR

The Nonexistence of Expansive Z^d Actions on Graphs

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Acta Mathematica Sinica,English Series 2005年第6期21卷 1509-1514页

作者： En Hui SHI Li zhen zhou Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China Department of Mathematics Suzhou University Suzhou 215006 P. R. China

It is well known that if X is an arc or a circle, then there is no expansive homeomorphism on X. In this paper we prove that there is no expansive Z^d action on X, which answers the two questions raised by us before, In 1979, Mané proved that there is no expansive homeomorphism on infinite dimensional spaces. Contrary to this result, we construct an expansive Z^2 action on an infinite dimensional space. We also construct an expansive Z^2 action on a zero dimensional space but no element in Z^2 is expansive.

关键词： Expansive homeomorphism Arc Circle Group action

Unsupervised machine learning accelerates solid electrolyte discovery

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Green Energy & Environment 2021年第1期6卷 3-4页

作者： Xu Zhang Bin Tang zhen zhou School of Materials Science and Engineering Computational Centre for Molecular ScienceInstitute of New Energy Material ChemistryKey Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Renewable Energy Conversion and Storage Center(ReCast)Nankai UniversityTianjin300350China

Traditional organic liquid electrolytes used in commercial Li-ion batteries would incur serious safety issues due to their flammability and volatility[1].The exploration and design of solid electrolytes with high room-temperature Li-ion conductivities(sRT)are important to improve the safety and cycle life of Li-ion batteries[2].Although previous investigations have proven that various physical factors correlate with Li-ion diffusion in solids,there is no unified theory to explain the similarity among distinctive crystal structures of solid-state Liion conductors(SSLCs).In addition,the exploration of a vast composition-structure space of thousands of materials is extremely *** current investigations mainly rely on‘trial and error’and are limited to a few kinds of candidates,such as lithium thiophosphates,garnets,sodium super ionic conductors(NASICONs),perovskites and argyrodites[3].Therefore,the discovery of novel SSLCs from wider materials on basis of available knowledge is significant.

关键词： electrolyte solid perovskite

Decomposition Theorems and Conjugate Pair in D_K Spaces

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Acta Mathematica Sinica,English Series 2014年第9期30卷 1513-1525页

作者： Ji zhen zhou Yu Tian WU School of Sciences Anhui University of Science and Technology School of Mathematics and Information Sciences Zhaoqing University

Let K be a right-continuous and nondecreasing function. A function f analytic in the unit disk D belongs to the space OK if ∫D｜f＇（z）｜2K（1 - ｜z｜2）dA（z）〈 ∞. Decomposition theorems for OK spaces are established in this paper. As an application, we obtain a characterization of interpolation by functions in DK spaces. Furthermore, we characterize functions in DK spaces by conjugate pairs.

关键词： DK spaces decomposition theorem conjugate pair

Fabricating high-performance sodium ion capacitors with P2-Na_(0.67)Co_(0.5)Mn_(0.5)O_2 and MOF-derived carbon

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Journal of Energy Chemistry 2019年第1期28卷 79-84页

作者： Haichen Gu Lingjun Kong Huijuan Cui Xianlong zhou Zhaojun Xie zhen zhou School of Materials Science and Engineering National Institute for Advanced Materials Institute of New Energy Material Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University

Sodium ion capacitors(SICs) have been considered as a kind of promising devices to achieve both high power and energy density. However, it is still a challenge to achieve high energy output at elevated power delivery due to the poor rate capability of battery-type electrode materials and the kinetic mismatch with capacitor-type electrode materials. In this work, to fabricate SICs, P2-Na_(0.67)Co_(0.5)Mn_(0.5)O_2(P2-NCM)was chosen as the battery-type cathode material, and a typical metal-organic framework(MOF) material,zeolitic imidazolate framework-8(ZIF-8) derived carbon(ZDC) was utilized as the capacitor-type anode material. Due to the kinetic match and high-rate performance of both electrodes, the ZDC//P2-NCM SICs exhibited an energy output of 18.8 Wh kg^(-1) at a high power delivery of 12.75 kW kg^(-1).

关键词： Energy density Power density P2-phase material Zeolitic imidazolate framework-8 Sodium ion capacitors