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Rational design of 3D porous niobium carbide MXene/rGO hybrid aerogels as promising anode for potassium-ion batteries with ultrahigh rate capability

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Nano Research 2023年第2期16卷 2463-2473页

作者： Cong Liu Zhitang Fang Xiaoge Li Jinhua Zhou Gang Yang Luming Peng Xuefeng Guo weiping ding Wenhua Hou Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Suzhou Key Laboratory of Functional Ceramic Materials Changshu Institute of TechnologyChangshu 215500China

An effective method is designed to construct three-dimensional(3D)Nb_(2)C/reduced graphene oxide(rGO)hybrid aerogels through a low-temperature graphene oxide(GO)-assisted hydrothermal self-assembly followed by freeze-drying and *** intimately coupled Nb_(2)C/rGO hybrid aerogel combines the advantages of large specific surface area and rich 3D interconnected porous structure of aerogel as well as high conductivity and low potassium diffusion energy barrier of Nb_(2)C,which not only effectively prevents the self-restacking of Nb2C nanosheets to allow more active sites exposed and accommodate the volume change during the charge/discharge process,but also increases the accessibility of electrolyte and promotes the rapid transfer of ions/*** a result,Nb_(2)C/rGO-2 as the anode of potassium ion batteries(KIBs)delivers a large reversible specific capacity(301.7 mAh·g^(−1)after 500 cycles at 2.0 A·g^(−1)),an ultrahigh rate capability(155.5 mAh·g^(−1)at 20 A·g^(−1)),and an excellent long-term large-current cycle stability(198.8 mAh·g^(−1)after 1,000 cycles at 10 A·g^(−1),with a retention of 83.3%).Such a high-level electrochemical performance,especially the ultrahigh rate capability,is the best among transition metal carbides and nitride(MXene)-based materials reported so far for *** diffusion kinetics of K+is investigated thoroughly,and the synergetic charge–discharge mechanism and the structure–performance relationship of Nb_(2)C/rGO are revealed *** present work provides a good strategy to solve the self-restacking problem of two-dimensional materials and also enlarges the potential applications of MXenes.

关键词： niobium-based transition metal carbides(Nb_(2)C MXene) reduced graphene oxide(rGO) hybrid aerogel potassium ion batteries ultrahigh rate capability

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A review:Multi-hierarchy design strategy of electrocatalysts for energy molecule conversion

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Journal of Energy Chemistry 2023年第11期86卷 54-68,I0003页

作者： Chenjia Liang Rurong Liu Ruiyao Zhao Xiaoxia Hou Yingxuan Zhao Jie Yang Tao Wang Teng Chen weiping ding Key Lab of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023JiangsuChina

Under the new energy resource structure,electrocatalysts are key materials for the development of proton membrane fuel cells,electrolysis of aquatic hydrogen devices,and carbon dioxide reduction equipment,to address energy shortages and even environmental pollution *** controlling the morphology or doping with heteroatoms for catalyst active centers have accelerated the reaction rate,it is difficult to solve the problems of multiple by-products,and poor stability of catalytic *** this,it will be seen that single regulation of metal active centers is difficult to comprehensively solve application *** assembly and coordination of catalyst multi-hierarchy structures at the mesoscale above the nanometer level probably be more reasonable strategies,and numerous studies in thermal catalysis have supported this *** article reviews the multi-hierarchy design of electrocatalyst active centers,high-energy supports,and peripheral structures in recent years,providing unconventional inspiration about electrocatalyst creation,which perhaps serves as a simple tutorial of electrocatalysis exploration for abecedarian.

关键词： Novel electrocatalysts Energy molecular conversion Multi-hierarchy design strategy

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Facile growth of homogeneous Ni（OH）2 coating on carbon nanosheets for high-performance asymmetric supercapacitor applications

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Nano Research 2018年第1期11卷 216-224页

作者： Mingjiang Xie Zhicheng Xu Shuyi Duan Zhengfang Tian Yu Zhang Kun xiang Ming Lin Xuefeng Guo weiping ding Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry & Chemical Engineering Nanjing University Nanjing 210023 China Hubei Key Laboratory for Processing and Application of Catalytic Materials Huanggang Normal University Huanggang 438000 China Institute of Materials Research and Engineering (IMRE) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore

The growth of a Ni（OH）2 coating on conductive carbon substrates is an efficient way to address issues related to their poor conductivity in electrochemical capacitor applications. However, the direct growth of nickel hydroxide coatings on a carbon substrate is challenging, because the surfaces of these systems are not compatible and a preoxidation treatment of the conductive carbon substrate is usually required. Herein, we present a facile preoxidation-free approach to fabricate a uniform Ni（OH）2 coating on carbon nanosheets （CNs） by an ion-exchange reaction to achieve the in situ transformation of a MgO/C composite to a Ni（OH）2/C one. The obtained Ni（OH）2/CNs hybrids possess nanosheet morphology, a large surface area （278 m2/g）, and homogeneous elemental distributions. When employed as supercapacitors in a three-electrode configuration, the Ni（OH）JCNs hybrid achieves a large capacitance of 2,218 F/g at a current density of 1.0 A/g. Moreover, asymmetric supercapacitors fabricated with the Ni（OH）2/CNs hybrid exhibit superior supercapacitive performances, with a large capacity of 198 F/g, and high energy density of 56.7 Wh/kg at a power density of 4.0 kW/kg. They show excellent cycling stability with 93% capacity retention after 10,000 cycles, making the Ni（OH）2/CNs hybrid a promising candidate for practical applications in supercapacitor devices.

关键词： in situ growth ion-exchange reaction hybrid Ni(OH)2 carbon nanosheet supercapacitor

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The modification toward excited-state dynamics and catalytic activity by isomeric Au_(44)clusters

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Nano Research 2023年第8期16卷 11383-11388页

作者： Tongxin Song Jie Kong Shisi Tang Xiao Cai Xu Liu Meng Zhou Wen Wu Xu weiping ding Yan Zhu School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China School of Physical Science and Technology Ningbo UniversityNingbo 315211China

The structure determination of metal nanoclusters protected by ligands is critical in understanding their physical and chemical properties,yet it remains elusive how the metal core and ligand of metal clusters cooperatively contribute to the observed ***,with the successful synthesis of Au_(44)TBPA_(22)Cl_(2)cluster(TBPA=4-tert-butylphenylacetylene),the structural isomer of previously reported Au_(44)L_(28)clusters(L denoted as ligand)is filled,thereby providing an opportunity to explore the property evolution rules imparted by different metal core structures or different surface ***-resolved transient absorption spectroscopy reveals that the difference in the core structure between Au_(44)TBPA_(22)Cl_(2)and Au_(44)L_(28)can bring nearly 360 times variation of excited-state lifetime,while only 3–24 times differences in excited-state lifetimes of the three Au_(44)L_(28)nanoclusters with identical metal core but different ligands are observed,which is due to much stronger impact of the metal core than the surface ligands in the electronic energy bands of the *** addition,the Au_(44)clusters protected by alkyne ligands are shown to be highly effective toward the electrochemical oxidation of ethanol,compared to the Au_(44)clusters capped by thiolates,which is ascribed to smaller charge transfer impedance of the former *** anticipate that the study will enhance the process in controlling the nanomaterial properties by precisely tailoring metal core or surface patterns.

关键词： cluster metal core surface ligand excited-state dynamics catalysis

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Methanol steam reforming for hydrogen production driven by an atomically precise Cu catalyst

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Green Energy & Environment 2024年第7期9卷 1079-1084页

作者： Weigang Hu Haoqi Liu Yuankun Zhang Jiawei Ji Guangjun Li Xiao Cai Xu Liu Wen Wu Xu weiping ding Yan Zhu School of Chemistry and Chemical Engineering Nanjing UniversityNanjing210093China School of Physical Science and Technology Ningbo UniversityNingbo315211China

Plasmon-induced hot-electron transfer from metal nanostructures is being intensely pursed in current photocatalytic research,however it remains elusive whether molecular-like metal clusters with excitonic behavior can be used as light-harvesting materials in solar energy utilization such as photocatalytic methanol steam *** this work,we report an atomically precise Cu_(13)cluster protected by dual ligands of thiolate and phosphine that can be viewed as the assembly of one top Cu atom and three Cu_(4)*** Cu_(13)H_(10)(SR)_(3)(PR’_(3))_(7)(SR=2,4-dichlorobenzenethiol,PR’_(3)=P(4-FC_(6)H_(4))_(3))cluster can give rise to highly efficient light-driven activity for methanol steam reforming toward H_(2)production.

关键词： Nanocluster Photocatalysis Methanol steam reforming Atomically precise Copper catalyst

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Adjacent acid sites cooperatively catalyze fructose to 5-hydroxymethylfurfural in a new, facile pathway

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Journal of Energy Chemistry 2020年第8期29卷 112-117,I0004页

作者： Xia Yu Yueying Chu Lei Zhang Hui Shi Mingjiang Xie Luming Peng Xuefeng Guo Wei Li Nianhua Xue weiping ding Key Lab of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093JiangsuChina State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Center for Magnetic ResonanceWuhan Institute of Physics and Mathematicsthe Chinese Academy of SciencesWuhan 430071HubeiChina Institute of Theoretical and Computational Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093JiangsuChina Department of Chemistry and Catalysis Research Center Technische Universitat MiinchenLichtenbergstr.4.85747 GarchingGermany

To study the effect of adjacent hydroxyl to the active sites, several acid catalysts, i.e. substituted benzoic acids with adjacent carboxyl are employed in the fructose dehydration to 5-hydroxymethylfurfural(HMF).Experimental results reveal that Br?nsted acid sites with adjacent carboxyl present higher catalytic ability than isolated ones. Computational results suggest that the adjacent sites lead to co-interaction on fructose, corresponding more stable transition state and faster HMF formation rate. Based on the enhancement from the adjacent sites, a novel ordered mesoporous carbon(OMC) full of carboxyls in surface is prepared and turns out to be an effective solid catalyst for HMF production from fructose derived from biomass.

关键词： Fructose dehydration Adjacent sites Cooperative catalysis 5-Hydroxymethylfurfural

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n-Pentylamine-intercalated layered perovskite-type oxide

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Chinese Science Bulletin 2001年第8期46卷 645-647页

作者： HOU Wenhua ZHONG Zhaohui ding weiping CHEN Yi CHEN Xiaoyuan ZHU Yongyuan MIN Naiben School of Chemistry and Chemical Engineering Nanjing UniveristyNanjing 210093China National Laboratory of Solid State Microstructures Nanjing UniveristyNanjing 210093China

A novel n-pentylamine-intercalated layered perovskite-type oxide, C5H11NH3-Sr2Nb3O10, was prepared and characterized by using XRD, FT-IR, Raman spec-trascopy, and elemental analysis. It was shown that the intercalated n-pentylamine adopted a bilayer formation with some overlap and tilt, and the lattice of the perovskite layer was distorted due to the intercalation of n-pentylamine. The as-prepared sample gave clear electric hysteresis loop and did not show fatigue after 1011 switching circles, and therefore, could be considered as a new kind of fatigue-free ferroelectric materials.

关键词： layered perovskite-type oxides ferroelectricity fatigue- free.

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Carbon nitride with encapsulated nickel for semi-hydrogenation of acetylene: pyridinic nitrogen is responsible for hydrogen dissociative adsorption

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Science China Chemistry 2018年第8期61卷 1014-1019页

作者： Teng Fu Tao Wang Hongfang Sun Yida Xu Zhen Dong Xiangke Guo Luming Peng Yan Zhu Zhaoxu Chen weiping ding Key Laboratory of Mesoscopic Chemistry School of Chemistry and Chemical Engineering Nanjing University

A new mechanism of catalyst has been demonstrated in this article. With the interaction between carbon nitride(CN) and encapsulated nickel, the CN in the catalyst has been endowed with new active sites for the adsorption and activation of hydrogen while nickel itself is physically isolated from the contact with reactive molecules. For the selective hydrogenation of acetylene in large amount of ethylene, the catalyst shows excellent ethylene selectivity than the nickel catalyst itself, which is almost totally unselective. Meanwhile, the CN itself is inactive for the reaction. The results of characterization demonstrate that pyridinic nitrogen doped in the carbon matrix should be the active sites for hydrogen dissociative adsorption. The theoretical calculations further confirm the results and provide with the detail in the electron transfer between nickel and CN in the catalyst. The current results supply a new concept for design of high performance catalyst.

关键词： carbon nitride nickel selective hydrogenation acetylene pyridinic nitrogen

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High-temperature treatment to engineer the single-atom Pt coordination environment towards highly efficient hydrogen evolution

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Journal of Energy Chemistry 2021年第8期30卷 212-219,I0005页

作者： Shanyong Chen Changchang Lv Ling Liu Muhong Li Jian Liu Jinyang Ma Panpan Hao Xuan Wang weiping ding Mingjiang Xie Xuefeng Guo Key Lab of Mesoscopic Chemistry MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Hubei Key Laboratory for Processing and Application of Catalytic Materials Huanggang Normal UniversityHuanggang 438000China

Development of high-performance and cost-effective catalysts for electrocatalytic hydrogen evolution reaction(HER)play crucial role in the growing hydrogen ***,the atomically dispersed metal catalysts have attracted increasing attention due to their ultimate atom utilization and great potential for highly cost-effective and high-efficiency HER ***,we propose a hightemperature treatment strategy to furtherly improve the HER performance of atomically dispersed Ptbased ***,after appropriate high-temperature treatment on the atomically dispersed Pt0.8@CN,the Pt species on the designed N-doped porous carbon substrate with rich defect sites can be re-dispersed to single atom state with new coordination *** obtained Pt0.8@CN-1000 shows superior HER performance with overpotential of 13 m V at 10 m A cm^(-2)and mass activity of 11,284 m A/mgPtat-0.1 V,much higher than that of the pristine Pt0.8@CN and commercial Pt/C *** experimental and theoretical investigations indicate that the high-temperature treatment induces the restructuring of coordination environment and then the optimized Pt electronic state leads to the enhanced HER *** work affords new strategy and insights to develop the atomically dispersed high-efficiency catalysts.

关键词： High-temperature treatment Atomically dispersed metal catalyst Coordination environment Hydrogen evolution reaction

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Research on Human-Vehicle-Road Friendliness Based on Improved SH-GH-ADD Control

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Sound & Vibration 2023年第1期57卷 45-68页

作者： Yangyang Bao Mingliang Yang Haibo Huang Liyuan Liu Honglin Zhu weiping ding School of Mechanical Engineering Southwest Jiaotong UniversityChengdu610031China

The hub-driven virtual rail train is a novel urban transportation system that amalgamates the benefits of modern trams and ***,this system is plagued by issues such as decreased ride comfort and severe deformation of urban roads due to the increase in sprung mass and long-term rolling at the same *** address these concerns and improve the human-vehicle-road friendliness of the virtual rail train,we propose an Improved Sky-Ground Hook and Acceleration-Driven Damper control(Improved SH-GH-ADD control)strategy for the semi-active suspension *** control monitors the vibration acceleration signal of the unsprung mass in real-time and selects the mixed Sky-Hook and Acceleration-Driven Damper(SH-ADD)control or the mixed Ground-Hook and Acceleration-Driven Damper(GH-ADD)control based on the positive and negative values of the vibration acceleration of the unsprung *** Improved SH-GH-ADD control combines the advantages of SH-ADD control and GH-ADD control to achieve control of the sprung mass and unsprung mass in the full fre-quency ***,through simulation and comparative analysis with traditional SH-ADD,GH-ADD,and mixed SH-GH control,we demonstrate the exceptional performance of the proposed algorithm.

关键词： SH control GH control ADD control ride comfort road friendliness

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