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Metal oxyacid salts-confined pyrolysis towards hierarchical porous metal oxide@carbon(MO@C)composites as lithium-ion battery anodes

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Nano Research 2023年第5期16卷 6903-6913页

作者： Huizhong Xu Chang Gao Zhaoyang Cheng linghui kong Wei Li Xiaochen Dong Jianjian Lin Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science Ministry of Education(MOE)Shandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Engineering Research Center of High Performance Polymer and Molding Technology Ministry of EducationQingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing211800China

Transition metal oxides(TMOs)have been thought of potential anodic materials for lithium-ion batteries(LIBs)owing to their intriguing ***,the limited conductivity and drastic volume change still hinder their practical ***,a metal oxyacid salts-confined pyrolysis strategy is proposed to construct hierarchical porous metal oxide@carbon(MO@C,MO=MoO_(2),V_(2)O_(5),WO_(3))composites for solving the aforementioned problems.A water-evaporation-induced self-assembly mechanism has been put forward for fabricating the MO@polyvinyl pyrrolidone(PVP)@SiO_(2)*** the following pyrolysis and etching process,small MO nanoparticles can be successfully encapsulated in the hierarchical porous carbon *** from the synergistic effect of MO nanoparticles and highly conductive carbon framework,MO@C composites show excellent electrochemical *** example,the as-obtained MoO_(2)@C composite exhibits a large discharge capacity(1513.7 mAh·g^(−1)at 0.1 A·g^(−1)),good rate ability(443.5 mAh·g^(−1)at 5.0 A·g^(−1)),supernal long-lived stability(669.1 mAh·g^(−1)after 1000 cycles at 1.0 A·g^(−1)).This work will inspire the design of novel anode materials for high-performance LIBs.

关键词： transition metal oxides hierarchical porous carbon framework anode materials lithium storage performance

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Deep Learning-Based Secure Transmission Strategy with Sensor-Transmission-Computing Linkage for Power Internet of Things

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Computers, Materials & Continua 2024年第3期78卷 3267-3282页

作者： Bin Li linghui kong Xiangyi Zhang Bochuo Kou Hui Yu Bowen Liu State Grid Beijing Urban District Power Supply Company Beijing100034China

The automatic collection of power grid situation information, along with real-time multimedia interaction between the front and back ends during the accident handling process, has generated a massive amount of power grid data. While wireless communication offers a convenient channel for grid terminal access and data transmission, it is important to note that the bandwidth of wireless communication is limited. Additionally, the broadcast nature of wireless transmission raises concerns about the potential for unauthorized eavesdropping during data transmission. To address these challenges and achieve reliable, secure, and real-time transmission of power grid data, an intelligent security transmission strategy with sensor-transmission-computing linkage is proposed in this paper. The primary objective of this strategy is to maximize the confidentiality capacity of the system. To tackle this, an optimization problem is formulated, taking into consideration interruption probability and interception probability as constraints. To efficiently solve this optimization problem, a low-complexity algorithm rooted in deep reinforcement learning is designed, which aims to derive a suboptimal solution for the problem at hand. Ultimately, through simulation results, the validity of the proposed strategy in guaranteed communication security, stability, and timeliness is substantiated. The results confirm that the proposed intelligent security transmission strategy significantly contributes to the safeguarding of communication integrity, system stability, and timely data delivery.

关键词： Secure transmission deep learning power Internet of Things sensor-transmission-computing

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The Wireless Power Transmission on the Wristto-Forehead Path Based on the Body Channel

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Journal of Beijing Institute of Technology 2022年第1期31卷 91-100页

作者： Cheng Han linghui kong Qingya Li Shan Yu Zhiwei Zhang Jingna Mao School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Institute of Automation Chinese Academy of SciencesBeijing 100190China. CAS Center for Excellence in Brain Science and Intelligence Technology Shanghai 200031China.

The body channel based wireless power transfer(BC-WPT)method utilizes the human body as the medium to transfer power for bioelectronics,which can achieve a lower transmission loss due to its higher ***,except for the channel length,different on-body loca-tions of the transmitter and receiver also influence the power supply *** paper fo-cuses on the wrist-to-forehead path to show the potential of BC-WPT for the brain bioelectronics such as the brain computer interface *** channel characteristics from 10 MHz to 60 MHz are measured by a vector network analyzer(VNA)and a prototype BC-WPT system with differ-ent copper electrodes and the lowest power loss locates between-22 dB and-33 ***,the minimum path loss limit is simulated in Advanced Design System(ADS)software and the low-est optimum path loss can reach nearly-13 ***,a rectifier circuit is also built at the receiv-er side to harvest *** results show that the open-circuit voltage(OCV)can reach 1.75 V with the transmitter of 50Ωoutput impedance supplying 5V_(pp)sine voltage at 60 MHz when adopt-ing 1 cm-diameter circular electrodes.

关键词： body channel based wireless power transfer(BC-WPT) wrist-to-forehead path chan-nel characteristics minimum path loss limit open-circuit voltage(OCV)

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A cascade of in situ conversion of bicarbonate to CO_(2) and CO_(2) electroreduction in a flow cell with a Ni-N-S catalyst

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Journal of Energy Chemistry 2024年第1期88卷 183-193,I0005页

作者： linghui kong Min Wang Yongxiao Tuo Shanshan Zhou Jinxiu Wang Guangbo Liu Xuejing Cui Jiali Wang Luhua Jiang Nanomaterials and Electrocatalysis Laboratory College of Materials Science and EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina State Key Laboratory of Heavy Oil Processing College of New EnergyChina University of Petroleum(East China)Qingdao 266580ShandongChina

Combination of CO_(2) capture using inorganic alkali with subsequently electrochemical conversion of the resultant HCO_(3)^(-)to high-value chemicals is a promising route of low cost and high *** electrochemical reduction of HCO_(3)^(-)is challenging due to the inaccessible of negatively charged molecular groups to the electrode ***,we adopt a comprehensive strategy to tackle this challenge,i.e.,cascade of in situ chemical conversion of HCO_(3)^(-)to CO_(2) and CO_(2) electrochemical reduction in a flow *** a tailored Ni-N-S single atom catalyst(SACs),where sulfur(S)atoms located in the second shell of Ni center,the CO_(2)electroreduction(CO_(2)ER)to CO is *** experimental results and density functional theory(DFT)calculations reveal that the introduction of S increases the p electron density of N atoms near Ni atom,thereby stabilizing^(*)H over N and boosting the first proton coupled electron transfer process of CO_(2)ER,i.e.,^(*)+e^(-)+^(*)H+^(*)CO_(2)→^(*)*** a result,the obtained catalyst exhibits a high faradaic efficiency(FE_(CO)~98%)and a low overpotential of 425 mV for CO production as well as a superior turnover frequency(TOF)of 47397 h^(-1),outcompeting most of the reported Ni *** importantly,an extremely high FECOof 90%is achieved at 50 mA cm^(-2)in the designed membrane electrode assembly(MEA)cascade electrolyzer fed with liquid *** work not only highlights the significant role of the second coordination on the first coordination shell of the central metal for CO_(2)ER,but also provides an alternative and feasible strategy to realize the electrochemical conversion of HCO_(3)^(-)to high-value chemicals.

关键词： S doped Ni-N-C single atom catalysts CO_(2)electrochemical reduction DFT calculations Membrane electrode assembly Reduction of bicarbonate

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Selective recognition of methyl viologen by an endo-functionalized naphthobox

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Chinese Chemical Letters 2022年第11期33卷 4896-4899页

作者： Weier Liu linghui kong Mao Quan Huan Yao Liupan Yang Ho Yu Au-Yeung Wei Jiang Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry Shenzhen Grubbs InstituteSouthern University of Science and TechnologyShenzhen 518055China Department of Chemistry The University of Hong KongHong KongChina

Highly selective binding of structurally similar substrates is common for biomolecular recognition,but is often challenging to realize in synthetic ***,we report highly selective binding of methyl viologen over other analogues by an endo-functionalized naphthobox.X-ray single crystal structure and Density Functional Theory(DFT)calculations revealed that the endo-functionalized groups in the cavity of the naphthobox is important for the high binding selectivity through the formation of multiple C-H…N,C-H…π,andπ…πinteractions with methyl viologen.

关键词： Molecular recognition Host-guest chemistry Endo-functionalized cavity Hydrogen bond Naphthobox

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Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl_(2) via modifying cellulose structure

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Chinese Journal of Chemical Engineering 2024年第5期69卷 227-237页

作者： linghui kong Chao Li Runxing Sun Shu Zhang Yi Wang Jun Xiang Song Hu Dong Wang Chuanjun Leng Xun Hu School of Material Science and Engineering University of JinanJinan 250022China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China Shandong BASAN Graphite New Material Plant Zibo 255311China

Development of pore structures of activated carbon(AC)from activation of biomass with ZnCl_(2) relies on content and structure of cellulose/hemicellulose in the *** pretreatment of biomass could induce dehydration and/or aromatization to change the structure of cellulose/*** might interfere with evolution of structures of AC,which was investigated herein via thermal pretreatment of willow branch(WB)from 200 to 360℃and the subsequent activation with ZnCl_(2) at 550℃.The results showed that thermal pretreatment at 360℃(WB-360)could lead to substantial pyrolysis to form biochar,with a yield of 31.9%,accompanying with nearly complete destruction of cellulose crystals and remarkably enhanced aromatic ***,cellulose residual in WB-360 could still be activated to form AC-360 with specific surface area of 1837.9 m~2·g^(-1),which was lower than that in AC from activation of untreated WB(AC-blank,2077.8 m~2·g^(-1)).Nonetheless,the AC-200 from activation of WB-200 had more developed pores(2113.9 m~2·g^(-1))and superior capability for adsorption of phenol,due to increased permeability of ZnCl_(2) to the largely intact cellulose structure in *** thermal pretreatment did increase diameters of micropores of AC but reduced the overall yield of AC(26.8%for AC-blank versus 18.0%for AC-360),resulting from accelerated cracking but reduced intensity of ***-situ infrared characterization of the activation showed that ZnCl_(2) mainly catalyzed dehydration,dehydrogenation,condensation,and aromatization but not cracking,suppressing the formation of derivatives of cellulose and lignin in *** thermal pretreatment formed phenolic-OH and C=O with higher chemical innerness,which changed the reaction network in activation,shifting morphology of fibrous structures in AC-blank to“melting surface”in AC-200 or AC-280.

关键词： Thermal pretreatment Activation with ZnCl_(2) Willow branch Activated carbon Biochar

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Water-sensitive damage mechanism and the injection water source optimization of low permeability sandy conglomerate reservoirs

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Petroleum Exploration and Development 2019年第6期46卷 1218-1230页

作者： WANG Lei ZHANG Hui PENG Xiaodong WANG Panrong ZHAO Nan CHU Shasha WANG Xinguang kong linghui China National Offshore Oil Corporation(China)LTD.(Zhanjiang Branch) Zhanjiang 524057China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China

The global mobility theory was used to evaluate the experimental results of oil displacement with water of different *** results of scanning electron microscopy,X diffraction of clay minerals,nonlinear seepage and nuclear magnetic resonance experiments and particle migration inhibition experiments before and after water flooding were compared to determine the mechanisms of water sensitive damage and enhanced water flooding mechanism of low permeability sandy conglomerate reservoirs in Wushi region of Beibuwan Basin,China.A production equation of the oil-water two phase flow well considering low-speed non-Darcy seepage and reservoir stress sensitivity was established to evaluate the effect of changes in reservoir properties and oil-water two-phase seepage capacity on reservoir productivity quantitatively,and injection water source suitable for the low permeability sandy conglomerate reservoirs in Wushi region was selected according to dynamic compatibility experimental results of different types of injected *** seepage capacity of reservoir is the strongest when the injected water is formation water of 2 times *** water-sensitive damage mechanisms of the reservoirs in Wushi region include hydration of clay minerals and particle *** increasing the content of cations(especially K+and Mg2+)in the injected water,the water-sensitive damage of the reservoir can be effectively *** formation water of Weizhou Formation can be used as the injection water source of low permeability sandy conglomerate reservoirs in the Wushi region.

关键词： Beibuwan Basin low permeability reservoir sandy conglomerate reservoir water-sensitive damage enhanced water flooding effective driving coefficient global mobility water flooding

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非均质物理双摆的混沌特性研究

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重庆大学学报 2024年第2期47卷 106-118页

作者：孔令辉刘丁杨蹇开林重庆大学航空航天学院重庆400044 重庆大学非均质材料力学重庆市重点实验室重庆400044 中国船舶集团海装风电股份有限公司重庆401122

为了解决工程实际中材料质量不均匀分布对双摆系统运动的影响,在均质物理双摆模型的基础上,将摆的质心位置和摆的转动惯量提取为变量,建立非均质双摆模型。将非均质双摆系统由Hamilton系统近似为拟Hamilton系统,运用双自由度的Melnikov... 详细信息

为了解决工程实际中材料质量不均匀分布对双摆系统运动的影响,在均质物理双摆模型的基础上,将摆的质心位置和摆的转动惯量提取为变量,建立非均质双摆模型。将非均质双摆系统由Hamilton系统近似为拟Hamilton系统,运用双自由度的Melnikov法,得到拟Hamilton系统存在Smale马蹄意义下混沌的能量阈值,以此作为Hamilton系统的混沌条件。利用最大Lyapunov指数图、分岔图、Poincaré截面图等数值方法验证混沌条件的正确性,并详细分析了各参数对系统运动状态的影响和作用机制。结果表明,非均质双摆的混沌阈值有较高复杂性,而且摆长、摆重、第一摆的质心位置同时影响着系统的能量与混沌阈值,解释了质心位置和转动惯量等参数发生变化时,系统在混沌和拟周期之间交替变换的原因。进一步研究了参数取值与Melnikov法适用性之间的关系,通过数值仿真分类讨论了Melnikov法不适用时的参数取值情况。

关键词：非均质物理双摆混沌拟周期 Melnikov法

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钢丝网骨架聚乙烯复合管中高压连接技术的研究与应用

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中国塑料 2017年第4期31卷 70-74页

作者：孔令辉王立凯山东东宏管业股份有限公司山东曲阜273100

简要介绍了钢丝网骨架聚乙烯复合管连接技术的应用现状,分析了钢丝网骨架聚乙烯复合管在中高压连接技术的研究情况。通过湖北恩施山区供水管道工程的实际案例,介绍了钢丝网骨架聚乙烯复合管高压力连接技术的成功应用经验,为钢丝网骨架... 详细信息

简要介绍了钢丝网骨架聚乙烯复合管连接技术的应用现状,分析了钢丝网骨架聚乙烯复合管在中高压连接技术的研究情况。通过湖北恩施山区供水管道工程的实际案例,介绍了钢丝网骨架聚乙烯复合管高压力连接技术的成功应用经验,为钢丝网骨架聚乙烯复合管在中高压力管道工程中推广应用起到积极的促进作用。

关键词：钢丝网骨架聚乙烯复合管电熔双密封连接应用

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从“必然”到“应当”:康德对认识论美学的超越

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扬州大学学报（人文社会科学版） 2014年第6期18卷 11-17页

作者：孔令辉扬州大学文学院江苏扬州225002

在探求审美客观必然性的过程中,经验主义美学陷入"审美趣味无争辩"的境地,理性主义美学则将审美与认识等同起来,从而取消了审美的独立性,认识论美学无法自圆其说。"应当"(sollen)是考察康德美学思想的一个关键词,不同于必然性,它表示一... 详细信息

在探求审美客观必然性的过程中,经验主义美学陷入"审美趣味无争辩"的境地,理性主义美学则将审美与认识等同起来,从而取消了审美的独立性,认识论美学无法自圆其说。"应当"(sollen)是考察康德美学思想的一个关键词,不同于必然性,它表示一种应然性。"应当"一方面表明反思判断力与知性、审美与认识的联系与区别,另一方面是一种自由。由此康德认为审美的必然性是主观原则上的"应当",从而超越了认识论美学。

关键词：康德认识论美学 “必然” “应当”

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