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高分散CuMnMgAl-LDH催化剂的可控制备及其在苯乙烯环氧化反应中的催化性能研究

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中国科学：化学 2017年第4期47卷 474-485页

作者：梁晓杜逸云贺宇飞冯俊婷李殿卿北京化工大学化工资源有效利用国家重点实验室北京100029

基于水滑石(LDHs)层板元素的可调控性,采用共沉淀法制备了系列Cu、Mn双活性组分非贵金属CuMnMgAl-LDH催化剂,用于苯乙烯环氧化反应.受LDHs层板晶格定位效应的影响,活性组分高度稳定分散,与采用沉淀沉积法制备的负载型CuMnO_x/MgAl-LDH... 详细信息

基于水滑石(LDHs)层板元素的可调控性,采用共沉淀法制备了系列Cu、Mn双活性组分非贵金属CuMnMgAl-LDH催化剂,用于苯乙烯环氧化反应.受LDHs层板晶格定位效应的影响,活性组分高度稳定分散,与采用沉淀沉积法制备的负载型CuMnO_x/MgAl-LDH催化剂相比,苯乙烯转化率提高13.9%.且CuMnMgAl-LDH表面丰富的羟基结构,降低了催化剂的表面酸性,有效抑制了环氧苯乙烷(SO)的开环,从而提高了SO的选择性.进一步通过调变Cu/Mn摩尔比探究了双金属组分的协同作用对催化性能的影响.其中,Cu/Mn比为0.5:0.5时,Cu_(0.5)Mn_(0.5)Mg_5Al_2-LDH催化剂协同作用最强,具有最低的活化能(22.5kJ/mol)及最优的活性(97.3%)和选择性(66.3%),且催化剂经3次循环使用后,活性无明显下降.此外,发现溶剂与催化剂对氧化剂的活化存在竞争效应.

关键词：水滑石高分散多功能苯乙烯环氧化活性氧物种

Accelerating lithium-sulfur battery reaction kinetics and inducing 3D deposition of li_(2)S using interactions between Fe_(3)Se_(4)and lithium polysulfides

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Journal of Energy Chemistry 2024年第8期95卷 540-553,I0012页

作者： Yihan lin liheng li Longjie Tan Yongliang li Xiangzhong Ren Peixin Zhang Chuanxin He lingna Sun College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina

Although lithium-sulfur batteries(LSBs)exhibit high theoretical energy density,their practical application is hindered by poor conductivity of the sulfur cathode,the shuttle effect,and the irreversible deposition of li_(2)*** address these issues,a novel composite,using electrospinning technology,consisting of Fe_(3)Se_(4)and porous nitrogen-doped carbon nanofibers was designed for the interlayer of *** porous carbon nanofiber structure facilitates the transport of ions and electrons,while the Fe_(3)Se_(4)material adsorbs lithium polysulfides(liPSs)and accelerates its catalytic conversion ***,the Fe_(3)Se_(4)material interacts with soluble liPSs to generate a new polysulfide intermediate,li_(x)FeS_(y)complex,which changes the electrochemical reaction pathway and facilitates the three-dimensional deposition of li_(2)S,enhancing the reversibility of *** designed LSB demonstrates a high specific capacity of1529.6 mA h g^(-1)in the first cycle at 0.2 *** rate performance is also excellent,maintaining an ultra-high specific capacity of 779.7 mA h g^(-1)at a high rate of 8 *** investigation explores the mechanism of the interaction between the interlayer and liPSs,and provides a new strategy to regulate the reaction kinetics and li_(2)S deposition in LSBs.

关键词： lithium-sulfur batteries Polysulfide intermediates li_(2)S electrodeposition Interlayers Electrostatic spinning Adsorption Catalysis

Boosting the performance of liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) electrode by uniform li_(3)PO_(4) coating via atomic layer deposition

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Chinese Chemical Letters 2024年第5期35卷 499-503页

作者： Mingjiao Lu Zhixing Wang Gui Luo Huajun Guo Xinhai li Guochun Yan Qihou li Xianglin li Ding Wang Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China BASF ShanShan Battery Materials Co. Ltd.Changsha 410006China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China National and Local Joint Engineering Laboratory for lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

Ultra-high nickel material is considered to be a promising cathode ***,with the increase of nickel content,the interfacial side reactions between the cathode and electrolyte become increasingly ***,an atomically controllable ionic conductor li_(3)PO_(4)(LPO)coating is deposited on the liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2)(NCM9064)based electrode by the atomic layer deposition *** results shows that the LPO coating is uniformly and densely covered on the surface of secondary particles of NCM9064,helping to prevent the direct contact between the electrolyte and cathode during the chargingdischarging *** addition,the coating layer is electrochemically *** a result,the interfacial side reactions during the long cycle are effectively suppressed,and the solid electrolyte interphase layer at the interface is *** electrode with 20 layers of LPO deposition(ALD-LPO-20)exhibits an excellent capacity retention of 81%after 200 cycles in 2.8-4.3 V at 25℃,which is 18%higher than the unmodified material(ALD-LPO-0).Besides,the moderate LPO coating improves the rate capability and high temperature cycling performance of *** study provides a method for the modification of ultra-high nickel cathode materials and corresponding electrodes.

关键词： Ultra-high nickel material liNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) Atomic layer deposition li_(3)PO_(4) Ionic conductor

时间域曲线拟合求取糠醛加氢反应的传递、吸附与动力学参数

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燃料化学学报 1992年第2期20卷 201-205页

作者：李殿卿朱卓群张仁佑王福荣北京化工学院应用化学系北京100029

利用脉冲-应答技术,测定了糠醛在BHK-1催化剂上的传递与吸附系数和加氢反应速率常数。依据修正过的Kubin-Kucera气固相传质一维扩散模型,用单纯形法进行多维搜索的最优化方法来完成富里埃分析和时间域曲线拟合的计算。求得了六个参数:E... 详细信息

利用脉冲-应答技术,测定了糠醛在BHK-1催化剂上的传递与吸附系数和加氢反应速率常数。依据修正过的Kubin-Kucera气固相传质一维扩散模型,用单纯形法进行多维搜索的最优化方法来完成富里埃分析和时间域曲线拟合的计算。求得了六个参数:E、D_e、k_f、k_a、K_a、k_r,并对富里埃分析法和时间域曲线拟合法作了比较。

关键词：加氢吸附脉冲应答

Preparation from Layered Precursor and Catalytic Activity towards Oxygen Reduction Reaction of CoSx Nanoparticles

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Preparation from Layered Precursor and Catalytic Activity to...

Layered niobium carbide enabling excellent kinetics and cycling stability of li-Mg-B-H hydrogen storage material Layered niobium carbide enabling excellent kinetics

中国化学会第六届全国结构化学学术会议

作者： Jingmin Xi~1,Yongjun Feng~*,dianqing li State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,15 Beisanhuan East Road,Chaoyang District,Beijing,100029

＜正＞Polymer Electrolyte Membrane Fuel Cells（PEMFCs） are one of the most promising alternative energy systems to have wide applications in transportation,stationary and portable electronic ***, Pt-based catalysts for the oxygen-reduction reaction（ORR） have severely limited fuel-cell commercialization due to their high price and *** metal chalcogenides（TMC） have been

关键词：

来源： cnki会议评论

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Rare Metals 2024年第3期43卷 1153-1166页

作者： li-Wen Lu Hui Luo Guang-Xu li Yun li Xin-Hua Wang Cun-Ke Huang Zhi-QiangLan Wen-Zheng Zhou Jin Guo Mohammad Ismail Hai-Zhen liu Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems IntegrationSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China State Key Laboratory of Featured Metal Materials and life-Cycle Safety for Composite Structures Nanning530004China School of Mechanical and Electrical Engineering Quzhou College of TechnologyQuzhou324000China Department of Materials Science and Engineering Zhejiang UniversityHangzhou310027China Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu21030Kuala NerusTerengganuMalaysia Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin300071China

The li-Mg-B-H composite(2liBH_(4)+MgH_(2))has a high capacity of 11.4 wt%as a hydrogen storage ***,the slow kinetics and poor cycling stability severely restrict its practical *** this work,a layered Nb_(2)C MXene was first synthesized and then introduced to tailor the kinetics and cycling stability of the li-Mg-B-H *** milled 2liH+MgB_(2)composites were initially hydrogenated to obtain the 2liBH_(4)+MgH_(2)*** 2liBH_(4)+MgH_(2)+5wt%Nb_(2)C can release 9.0 wt%H_(2)in 30 min at 400℃,while it is only 2.7 wt%for the undoped 2liBH_(4)+MgH_(2).The dehydrogenation activation energies of MgH_(2)and liBH_(4)are 123 and 154 kJ·mol^(-1)respectively for the 5 wt%Nb_(2)C-doped composite,lower than the undoped composite(164 and 165 kJ·mol^(-1)).The 2liBH_(4)+MgH_(2)+5 wt%Nb_(2)C possesses excellent cycling stability,with the reversible capacity only slightly reduced from 9.4 wt%for the 1st cycle to 9.3 wt%for the 20th ***_(2)C keeps stable in the composite and acts as an efficient catalyst for the li-Mg-B-H *** is believed that both the layered structure and the active Nb element contribu te to the enhanced hydrogen storage performances of the li-Mg-B-H *** work confirms that the Nb_(2)C MXene with layered stru cture has a significant enhancing impact on the li-Mg-B-H hydrogen storage materials,which is different from the bulk NbC.

关键词： Hydrogen storage lithium borohydride Magnesium hydride Nb_(2)C MXene

Hard-carbon hybrid li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

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Journal of Energy Chemistry 2024年第1期88卷 252-259,I0006页

作者： Fang Yan Yan liu Yuan li Yan Wang Zicen Deng Meng li Zhenwei Zhu Aohan Zhou Ting li Jingyi Qiu Gaoping Cao Shaobo Huang Biyan Wang Hao Zhang School of Chemistry and Biological Engineering University of Science and TechnologyBeijing 100083China Research Institute of Chemical Defense Beijing 100191China College of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina National Base for International Science&Technology Cooperation School of ChemistryXiangtan UniversityXiangtan 411105HunanChina Materials and Manufacturing Department Beijing University of TechnologyBeijing 100124China

To achieve high energy density in lithium batteries,the construction of lithium-ion/metal hybrid anodes is a promising *** particular,because of the anisotropy of graphite,hybrid anode formed by graphite/li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accumulation of dead li,which seriously affects the cycle life of batteries and even causes safety ***,by comparing graphite with two types of hard carbon,it was found that hybrid anode formed by hard carbon and lithium metal,possessing more disordered mesoporous structure and lithophilic groups,presents better *** indicate that the mesoporous structure provides abundant active site and storage space for dead *** the synergistic effect of this structure and lithophilic functional groups(–COOH),the reversibility of hard carbon/lithium metal hybrid anode is maintained,promoting uniform deposition of lithium metal and alleviating formation of lithium *** hybrid anode maintains a 99.5%Coulombic efficiency(CE)after 260 cycles at a specific capacity of 500 m Ah/*** work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.

关键词： Hard carbon/li metal hybrid anode Mesoporous structure Surface oxygen functional group Fast charging lithium batteries

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国产“双圈”牌滤纸吸力率定曲线研究

武汉大学学报（工学版） 2016年第1期49卷 1-8,53页

作者：唐栋李典庆金浩飞一山武汉大学水资源与水电工程科学国家重点实验室湖北武汉430072 武汉大学水工岩石力学教育部重点实验室湖北武汉430072 普渡大学土木工程学院美国西拉法叶47906

滤纸法是测量吸力的一种简单又经济的方法,国外已经有了大量关于Whatman No.42和Schleicher&Schuell No.589滤纸的研究,而国内关于国产"双圈"牌滤纸的研究还处于起步阶段.基于此,详细介绍了滤纸法测定吸力的基本原理,归纳了已有文献中关... 详细信息

滤纸法是测量吸力的一种简单又经济的方法,国外已经有了大量关于Whatman No.42和Schleicher&Schuell No.589滤纸的研究,而国内关于国产"双圈"牌滤纸的研究还处于起步阶段.基于此,详细介绍了滤纸法测定吸力的基本原理,归纳了已有文献中关于3种国产"双圈"牌滤纸测定吸力的成果,在此基础上进行了再分析,提出了便于实际应用的新的吸力率定方程.结果表明:双线性方程能够较好拟合国产"双圈"牌滤纸的吸力率定曲线,同一种型号滤纸的基质吸力和总吸力率定曲线可以采用同一方程,新提出的吸力率定曲线涵盖更大范围的吸力;No.201型与No.203型滤纸吸力率定试验数据较多且结果比较一致,得到的吸力率定曲线可靠度较高,No.202型滤纸建议进一步试验以获得更加稳定的吸力率定曲线.

关键词： “双圈”牌滤纸滤纸法率定曲线吸力非饱和土

Enhanced electrochemical performance of li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3) solid electrolyte by anion doping

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Nano Research 2024年第3期17卷 1465-1472页

作者： Jingrui Kang Xu Guo Rui Gu Honglei Hao Yi Tang Jiahui Wang li Jin Hongfei li Xiaoyong Wei Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Energy and Materials Shanghai Key Laboratory of Engineering Materials Application and EvaluationShanghai Polytechnic UniversityShanghai 201209China

Nowadays,the majority of the studies on the substitution are focused on cations(such as Y^(3+),Ti^(4+),P^(5+),etc.)in li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP),while there are few studies on the substitution of anion O^(2-).In this work,the modified LATP with a series of liCl(LATPClx,x=0.1,0.2,0.3,0.4)additives is prepared to enhance ionic *** successful introduction of Cl-makes the length of the c axis decrease from 20.822(2)to 20.792(1)Å,and the bulk conductivity of 2.13×10^(-3) S·cm^(-1) is achieved in LATPCl_(0.3).Moreover,the Al/Ti-O1/Cl1 and Al/Ti-O_(2)/Cl_(2) distance decrease,while the li1-O_(2)/Cl_(2) distance *** ions migrate more easily in the nanochannel of *** addition,the liCl additive increases the relative density and the grain boundary conductivity of LATPClx ***,a higher ionic conductivity of 2.12×10^(–4) S·cm^(-1) and a low activation energy of 0.30 eV are obtained in LATPCl_(0.3).Correspondingly,the symmetric cell exhibits a low overpotential of±50 mV for over 200 h in LATPCl_(0.3).The solid-state li|LATPCl_(0.3)|NCM811(NCM811=liNi0.8Co0.1Mn0.1O_(2))battery exhibits high initial capacity 185.1 mAh·g^(-1) with a capacity retention rate of 95.4%after 100 cycles at 0.5 *** result suggests that liCl additive is an effective strategy to promote electrochemical properties of LATP solid electrolyte and can be considered for reference to other inorganic solid electrolytes systems.

关键词： li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)solid electrolyte anion doping ionic conductivity cyclic performance