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Hierarchical porous hard carbon enables integral solid electrolyte interphase as robust anode for sodium-ion batteries

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Rare Metals 2020年第9期39卷 1053-1062页

作者： Xu-Kun Wang Juan Shi Li-Wei Mi Yun-Pu Zhai Ji-Yu Zhang Xiang-Ming Feng Zi-Jie Wu Wei-Hua Chen Green Catalysis center College of ChemistryZhengzhou UniversityZhengzhou 450001China center of Advanced Materials Research Zhongyuan University of TechnologyZhengzhou 450007China Northwest Composites center Department of MaterialsUniversity of ManchesterManchester M139PLUK

Hard carbon is the most promising anode for sodium-ion battery applications due to the wide availability and low work ***,it often delivers worse electrochemical performance in ester-based ***,a hierarchically porous loose sponge-like hard carbon with a highly disordered phase,prepared from the biomass of platanus bark,exhibits superior rate performance with a capacity of 165 mAh·g-1 at a high current of1 A·g-1,and high retention of 71.5%after 2000 cycles in an ester-based *** effect of the hierarchically porous loose sponge-like structure on the formation dynamics of solid electrolyte interphase(SEI),and related properties,was studied via cyclic voltammetry(CV),galvanostatic intermittent titration technique(GITT),X-ray photoelectron spectroscope(XPS),Fourier transform infrared spectroscopy(FTIR)and electrochemical impedance spectroscopy(EIS)*** results reveal that the hierarchically porous structure can construct continued connecting channels and accelerate the electrolyte transport,which is beneficial to the reaction kinetics of ***,the mesoporous structure is conducive to good contact between electrolyte and materials and shortens the Na+diffusion path,which in turn facilitates the charge transfer kinetics in the material.

关键词： Sodium-ion battery Hard carbon Hierarchically porous structure SEI Ester-based electrolyte

Whale Optimization Algorithm-Based Deep Learning Model for Driver Identification in Intelligent Transport Systems

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Computers, Materials & Continua 2023年第5期75卷 3497-3515页

作者： Yuzhou Li Chuanxia Sun Yinglei Hu Information technology Division Henan Transportation Development CenterZhengzhou450000China

Driver identification in intelligent transport systems has immense demand,considering the safety and convenience of traveling in a *** rapid growth of driver assistance systems(DAS)and driver identification system propels the need for understanding the root causes of automobile ***,in the case of insurance,it is necessary to track the number of drivers who commonly drive a car in terms of insurance *** is observed that drivers with frequent records of paying“fines”are compelled to pay higher insurance payments than drivers without any penalty *** driver identification act as an important information source for the intelligent transport *** study focuses on a similar objective to implement a machine learning-based approach for driver *** data is collected from in-vehicle sensors using the controller area network(CAN)and then converted to binary form using a one-hot encoding ***,the transformed data is dimensionally reduced using the Principal Component Analysis(PCA)technique,and further optimal parameters from the dataset are selected using Whale Optimization Algorithm(WOA).The most relevant features are selected and then fed into a Convolutional Neural Network(CNN)*** proposed model is evaluated against four different use cases of driver *** results show that the best prediction accuracy is achieved in the case of drivers without *** proposed model yielded optimal accuracy when evaluated against the K-Nearest Neighbors(KNN)and Support Vector Machines(SVM)models with and without using dimensionality reduction approaches.

关键词： Driver identification intelligent transport system PCA WOA CNN

BOUNDEDNESS OF THE CALDER´ON COMMUTATOR WITH A ROUGH KERNEL ON TRIEBEL-LIZORKIN SPACES

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Acta Mathematica Scientia 2023年第4期43卷 1618-1632页

作者：胡国恩刘洁 center of Fundamental Science Huanghe Science and Technology UniversityZhengzhou 450063China

In this paper,we consider the boundedness on Triebel-Lizorkin spaces for the d-dimensional Calder´on commutator defined by TΩ,af(x)=p.v.∫R_(d)Ω(x−y)/|x−y|^(d+1)(a(x)−a(y))f(y)dy,where Ω is homogeneous of degree zero,integrable on Sd−1 and has a vanishing moment of order one,and a is a function on Rd such that∇a∈L^(∞)(R^(d)).We prove that if 1

关键词： Calder´on commutator Fourier transform Littlewood-Paley theory Calder´on reproducing formula

Construction of Ru/WO3 with hetero-interface structure for efficient hydrogen evolution reaction

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Journal of Energy Chemistry 2023年第8期83卷 150-157,I0006页

作者： Xin Xie Yunxiao Fan Wanyu Tian Meng Zhang Jialin Cai Xingang Zhang Jie Ding Yushan Liu Siyu Lu Green Catalysis center College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina College of Material Henan Key Laboratory of Aeronautical Materials and Application TechnologyZhengzhou University of AeronauticsZhengzhou 4500oHenanChina

Water electrolysis is considered as one most promising technique for hydrogen *** high efficiency electrocatalyst is the key to accelerating the sluggish kinetics of the hydrogen evolution reaction(HER) in alkaline *** this work,an efficient HER electrocatalyst with hetero-interfacial metal-metal oxide structure was constructed through a redox solid phase reaction(SPR) *** the annealing process under Ar atmosphere,RuO_(2) and WS_(2)in RuO_(2)/WS_(2)precursor were converted to Ru nanoparticles(NPs) and WO3in situ,where tiny Ru NPs and oxygen vacancies were uniformly distributed onto the newly formed *** characterization techniques were adopted to confirm the successful formation of Ru/WO_(3)electrocatalyst(RWOC).The optimized RWOC sample annealed at 400℃ exhibited the low overpotential value of 13 mV at a current density of 10 mA cm^(-2)and strong durability under the alkaline *** functional theoretical calculations further revealed that the promoted adsorption/desorption rate of reaction intermediates and the accelerated kinetics of HER process were deduced to the synergistic effect between Ru and WO_(3)in *** work provides a feasible method to fabricate highly efficient HER electrocatalysts.

关键词： Ru WO_(3) Hetero-interface Hydrogen evolution reaction Electrocatalyst

Ethanol-derived white emissive carbon dots:The formation process investigation and multi-color/white LEDs preparation

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Nano Research 2022年第2期15卷 942-949页

作者： Boyang Wang Haoqiang Song Zhiyong Tang Bai Yang Siyu Lu Green Catalysis center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Henan Institute of Advanced technology Zhengzhou UniversityZhengzhou 450001China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China State Key Lab of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Carbon dots(CDs)have attracted much attention due to their excellent photoelectric properties and potential *** previous studies have shown that almost all organic molecules can be converted into CDs via chemical carbonization,the mechanism of the conversion process remains *** hydrothermal/solvothermal method commonly used to prepare CDs is complicated and leads to the generation of many by-product CDs with similar *** that the purification of the synthesized by-products is difficult,the process of CDs formation cannot be readily analyzed and ***,we use ethanol as a carbon source to synthesize white-emitting CDs(W-CDs).Column chromatography separation shows that the synthesized W-CDs are composed of blue-,cyan-,and yellow-emitting CDs that fluoresce at wavelengths corresponding to the three emission centers of *** the samples have similar graphitic structure,they exhibit different surface states due to variations in the degree of oxidation and ***,the red-shift in their emission peaks is attributed to an increased degree of carbonization in their polymer *** calculations verify the experimental results,and the prepared CDs are successfully used to develop multi-color and white light-emitting diodes(LEDs).

关键词： carbon dots multi-color-emissive cross-linking fluorescence mechanism phosphors

Round-robin differential quadrature phase-shift quantum key distribution

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Chinese Physics B 2017年第2期26卷 63-67页

作者： Chun Zhou Ying-Ying Zhang Wan-Su Bao Hong-Wei Li Yang Wang Mu-Sheng Jiang zhengzhou Information Science and technology Institute Zhengzhou 450001 China Synergetic Innovation center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China

Recently,a round-robin differential phase-shift（RRDPS） protocol was proposed[Nature 509,475（2014）],in which the amount of leakage is bounded without monitoring the signal *** states of the phase-encoded Bennett-Brassard 1984 protocol（PE-BB84） to the RRDPS,this paper presents another quantum key distribution protocol called round-robin differential quadrature phase-shift（RRDQPS） quantum key *** a train of many pulses as a single packet,the sender modulates the phase of each pulse by one of {0,π/2,π,3π/2},then the receiver measures each packet with a Mach-Zehnder interferometer having a phase basis of 0 or π/*** RRDQPS protocol can be implemented with essential similar hardware to the PE-BB84,so it has great compatibility with the current quantum *** we analyze the security of the RRDQPS protocol against the intercept-resend attack and the beam-splitting *** show that the proposed protocol inherits the advantages arising from the simplicity of the RRDPS protocol and is more robust against these attacks than the original protocol.

关键词： round-robin differential phase-shift protocol quantum key distribution intercept-resend attack beam-splitting attack

Effects of systematic phase errors on optimized quantum random-walk search algorithm

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Chinese Physics B 2015年第6期24卷 155-163页

作者：张宇超鲍皖苏汪翔付向群 zhengzhou Information Science and technology Institute Synergetic Innovation center of Quantum Information and Quantum Physics University of Science and Technology of China

This study investigates the effects of systematic errors in phase inversions on the success rate and number of iterations in the optimized quantum random-walk search algorithm. Using the geometric description of this algorithm, a model of the algorithm with phase errors is established, and the relationship between the success rate of the algorithm, the database size, the number of iterations, and the phase error is determined. For a given database size, we obtain both the maximum success rate of the algorithm and the required number of iterations when phase errors are present in the algorithm. Analyses and numerical simulations show that the optimized quantum random-walk search algorithm is more robust against phase errors than Grover＇s algorithm.

关键词： quantum search algorithm quantum random walk phase errors robustness

CoS_(2)/S-Doped C with In Situ Constructing Heterojunction Structure for Boosted K-lon Diffusion and Highly Efficient Storage

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Energy & Environmental Materials 2023年第6期6卷 402-408页

作者： Zhipeng Zhao Xiangdong Pei Jiang Li Yanchao Qin Chuanqi Li Jingyun Cheng Yongzhu Fu Xin Du Dan Li College of Chemistry Zhengzhou UniversityZhengzhou 450001China Green Catalysis center Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of ChemistryXinjiang UniversityUrumqi 830046China College of Computer National University of Defense TechnologyChangsha 410073China National Supercomputing center in zhengzhou Zhengzhou 450001China

Exploring the desired anode materials to address the issues of poor structural stability tardy redox kinetics caused by large potassium ionic radius are fatal for the realization of large-scale applications of potassium-ion *** this work,the feasibility to achieve promoted K^(+)storage by constructing the model of CoS_(2)enfolded in carbon was verified by the density functional theory *** the results predicted a faster electron/potassium ion transport kinetics than bare CoS_(2)by increasing electron carrier density and narrowing diffusion ***,an interfacial engineering strategy was applied and implemented to synthesize the CoS_(2)nanoparticles enveloped in the S-doped carbon(CoS_(2)/SC)under this *** as-prepared CoS_(2)/SC composite exhibited a prominent rate capability and long cycling lifespan,delivering the high capacity of 375 mA h g^(-1)at 0.2 A g^(-1)at the 100th cycle and 273 mA h g^(-1)at 2 A g^(-1)over 300 *** in/ex situ characterizations unraveled the converse mechanism of CoS_(2)/SC in K^(+)storage,showing an eventually reversible phase transformation of K_(x)CoS_(2)Co↔within the electrochemical reactions.

关键词： anode CoS_(2) DFT calculation fast ion transport potassium-ion batteries

Optimized quantum random-walk search algorithm for multi-solution search

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Chinese Physics B 2015年第11期24卷 133-139页

This study investigates the multi-solution search of the optimized quantum random-walk search algorithm on the hypercube. Through generalizing the abstract search algorithm which is a general tool for analyzing the search on the graph to the multi-solution case, it can be applied to analyze the multi-solution case of quantum random-walk search on the graph directly. Thus, the computational complexity of the optimized quantum random-walk search algorithm for the multi-solution search is obtained. Through numerical simulations and analysis, we obtain a critical value of the proportion of solutions q. For a given q, we derive the relationship between the success rate of the algorithm and the number of iterations when q is no longer than the critical value.

关键词： quantum search algorithm quantum random walk multi-solution abstract search algorithm