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Inside-out dual-doping effects on tubular catalysts:Structural and chemical variation for advanced oxygen reduction performance

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Nano Research 2022年第1期15卷 361-367页

作者： Yang Gao debin kong Jiaxu Liang Daliang Han Bin Wang Quan-Hong Yang Linjie Zhi CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China University of Chinese Academy of Sciences Beijing 100049China

Dual-doping of carbon,especially the combination of nitrogen and a secondary heteroatom,has been demonstrated efficient to optimize the oxygen reduction reaction(ORR)***,the optimum dual-doping is still not clear due to the lack of strong experimental proofs,which rely on a reliable method to prepare carbon materials that can rule out the interference factors and then emphasize only the doping *** this work,an inside-out doping method is reported to prepare carbon submicrotubes(CSTs)as a material to study the principles of designing dual-doping catalysts for *** interference factors including the metal impurities and doping gradient in the bulk phase are excluded,and the doping effects including the structural and chemical variation of carbon are studied.P-doping exhibited a higher pore-forming ability to perforate carbon and a lower doping content,but a higher ORR catalytic activity as compared with S-and B-doped N-CSTs,demonstrating the N,P co-doping is more efficient in making carbon-based catalysts for ***-principle calculations reveal that the edge C situated around the oxidized P site nearby a graphitic N atom is the active site that shows the lowest ORR overpotential comparable to Pt-based *** study suggests that the catalytic activity of dual-heteroatoms-doped carbons not only depends on the intrinsic chemical bonding between heteroatoms and carbon,but also is affected by the structural variation generated by introducing different atoms,which can be extended to the study of other kinds of functionalization of carbon and potential reactions besides ORR.

关键词： dual-doping phosphorus carbon tubes oxygen reduction metal-free catalysts

青藏高原东南缘昆虫多样性的海拔梯度格局研究

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环境科学研究 2024年第10期37卷 2138-2147页

作者：廖周洋杨大荣孔德斌官云芳张颖曾洁王戌勃袁煜林邓忠坚张媛西南林业大学云南生物多样性研究院云南昆明650224 中国科学院西双版纳热带植物园云南西双版纳666303 西南山地森林资源保育与利用教育部重点实验室云南昆明650224

为阐明青藏高原地区昆虫多样性与海拔梯度间的相关性,在青藏高原东南缘的迪庆藏族自治州开展了昆虫多样性的海拔梯度格局研究,调查海拔范围为1600~3800 m。基于alpha多样性指数和Jaccard相似性系数,使用回归分析、主成分分析和beta多样... 详细信息

为阐明青藏高原地区昆虫多样性与海拔梯度间的相关性,在青藏高原东南缘的迪庆藏族自治州开展了昆虫多样性的海拔梯度格局研究,调查海拔范围为1600~3800 m。基于alpha多样性指数和Jaccard相似性系数,使用回归分析、主成分分析和beta多样性分解等方法探讨了海拔梯度对昆虫多样性分布格局的影响。结果表明:①青藏高原东南缘具有较高的昆虫多样性,4次野外调查共采集到昆虫5141头,隶属于13目80科;不同海拔梯度上的昆虫群落组成具有差异,相比于高海拔区域,低海拔区域拥有更多的昆虫类群,这可能是由于低海拔地区具有较好的水热条件和生境异质性,可为不同昆虫类群提供适宜生境。②昆虫alpha多样性指数随海拔的升高而降低,可能是由海拔升高引起的温度降低以及植被类型的转变导致。③不同海拔梯度间昆虫群落Jaccard相似性系数在0.36~0.56之间,均表现为中等不相似或中等相似;除低海拔区域外,相邻海拔梯度间昆虫群落的相似性随海拔升高而逐渐降低,这一趋势可能是由海拔梯度升高带来的环境压力改变以及物种对特定海拔的适应性分化引起的。研究显示,青藏高原东南缘的昆虫多样性分布格局受海拔梯度显著影响,低海拔地区具有更高的昆虫多样性,不同海拔梯度具有各自的优势昆虫类群,不同海拔梯度间的多样性差异主要是由于周转而非嵌套导致。该研究结果可为青藏高原昆虫多样性保护提供重要科学依据。

关键词：昆虫多样性青藏高原海拔梯度分布格局物种周转

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Synergistically tuning the graphitic degree,porosity,and the configuration of active sites for highly active bifunctional catalysts and Zn-air batteries

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Nano Research 2022年第9期15卷 7959-7967页

作者： Yang Gao debin kong Fengli Cao Shuai Teng Tao Liang Bin Luo Bin Wang Quan-Hong Yang Linjie Zhi CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China College of New Energy Research Center for Advanced Chemical Engineering and Energy MaterialsChina University of Petroleum(East China)Qingdao 266580China Nanomaterials Centre Australian Institute for Bioengineering and Nanotechnology and School of Chemical EngineeringThe University of QueenslandBrisbaneQLD 4072Australia University of Chinese Academy of Sciences Beijing 100049China

Rational design and tailoring of the structural features of Co-N-C catalysts are urgently required to construct highly efficient bifunctional non-noble metal electrocatalysts for both oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).Herein,we report a series of carbon-based catalysts with varied structural features,specifically the graphitic degree of carbon,porosity,and the configuration of active sites,and their effects on bifunctional oxygen electrocatalytic *** the synergistic tuning of these structural factors,the well-tailored Co-N-C catalyst exhibits a high bifunctional electrocatalytic activity,as revealed by a half-wave potential of 0.84 V for ORR and a low overpotential of 420 mV at 10 mA·cm^(−2)for *** impressively,the Zn-air battery using the optimum catalyst delivers excellent performance including a peak power density of 125.2 mW·cm_(−2)and a specific capacity of 790.8 mAh·gZn^(−1),as well as stable cycling durability,outperforming the noble metalsbased *** first-principles calculations reveal that the interlayer interaction between the pyridinic N-doped graphene and the confined Co nanoparticles increases the electronic states of the active C atoms near the Fermi level,thus enhancing the adsorption of the HOO*intermediate and generating superior catalytic activity for bifunctional oxygen *** comprehensively studying the structural factors of catalysts,the bifunctional catalytic behaviors,the use in a practical Zn-air device,and theoretical simulations,this work may also give inspirations to the design,use,and understanding of other kinds of catalysts.

关键词： electrocatalysis bifunctional Co-N-C ZIFs Zn-air battery

An orientated mass transfer in Ni-Cu tandem nanofibers for highly selective reduction of CO_(2) to ethanol

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Fundamental Research 2023年第5期3卷 786-795页

作者： Xiaoxiong Huang debin kong Yingjie Ma Bin Luo Bin Wang Linjie Zhi CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt LuciaQLD 4072Australia Institute of New Energy College of Chemical EngineeringChina University of Petroleum(East China)QingdaoChina

Electrochemically reducing CO_(2)to ethanol is attractive but suffers from poor *** catalysis that integrates the activation of CO_(2)to an intermediate using one active site and the subsequent formation of hydrocarbons on the other site offers a promising approach,where the control of the intermediate transfer between different catalytic sites is *** propose an internally self-feeding mechanism that relies on the orientation of the mass transfer in a hierarchical structure and demonstrate it using a one-dimensional(1D)tandem core-shell ***,the carbon-coated Ni-core(Ni/C)catalyzes the transformation of CO_(2)-to-CO,after which the CO intermediates are guided to diffuse to the carbon-coated Cu-shell(Cu/C)and experience the selective reduction to ethanol,realizing the orientated key intermediate *** show that the Faradaic efficiency for ethanol was 18.2%at-1 V ***(V_(RHE))for up to 100 *** following mechanism study supports the hypothesis that the CO_(2)reduction on Ni/C generates CO,which is further reduced to ethanol on Cu/C *** functional theory calculations suggest a combined effect of the availability of CO intermediate in Ni/C core and the dimerization of key∗CO intermediates,as well as the subsequent proton-electron transfer process on the Cu/C shell.

关键词： CO_(2)electroreduction Ethanol Ni-Cu Core-Shell Tandem

New soliton wave solutions of a(2+1)-dimensional Sawada-Kotera equation

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Journal of Ocean Engineering and Science 2023年第5期8卷 527-532页

作者： kong debin Hadi Rezazadeh Najib Ullah Javad Vahidi Kalim U.Tariq Lanre Akinyemi Department of Mathematics Yantai Nanshan UniversityShandong 265713China Faculty of Engineering Technology Amol University of Special Modern TechnologiesAmolIran Department of Mathematics COMSATS University IslamabadIslamabad 45550Pakistan Department of Applied Mathematics Iran University of Science and TechnologyTehranIran Department of Mathematical Sciences University of South AfricaPretoria 0002South Africa Department of Mathematics Mirpur University of Science and TechnologyMirpur 10250(AJK)Pakistan Department of Mathematics Lafayette CollegeEastonPennsylvaniaUnited States

In this work,we studied a(2+1)-dimensional Sawada-Kotera equation(SKE).This model depicts non-linear wave processes in shallow water,fluid dynamics,ion-acoustic waves in plasmas and other phe-nomena.A couple of well-established techniques,the Bäcklund transformation based on the modified Kudryashov method,and the Sardar-sub equation method are applied to obtain the soliton wave solution to the(2+1)-dimensional *** illustrate the behavior of the nonlinear model in an appealing fashion,a variety of travelling wave solutions are formed,such as contour,2D,and 3D *** pro-posed approaches are proved more convenient and dominant for getting analytical solutions and can also be implemented to a variety of physical models representing nonlinear wave phenomena.

关键词： Modified Kudryashov method Sardar-sub equation method Bäcklund transformation(2+1)-dimensional SKE Soliton wave solutions

锂/钠-氯二次电池的最新进展——从材料构建到性能评估

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储能科学与技术 2024年第6期13卷 1824-1834页

作者：杨建航冯文婷韩俊伟魏欣茹马晨宇毛常明智林杰孔德斌青岛科技大学材料科学与工程学院山东青岛266042 中国石油大学(华东)高端化工与能源材料研究中心中国石油大学(华东)新能源学院山东青岛266580

传统锂离子电池的能量密度已难以满足日益增长的更高能量密度的需求。开发新型高能量密度二次电池是最为有效的一个策略。近期,基于商用一次锂-亚硫酰氯锂电池衍生而来的锂/钠-氯二次电池因其高能量密度而备受关注,成为替代传统锂离子... 详细信息

传统锂离子电池的能量密度已难以满足日益增长的更高能量密度的需求。开发新型高能量密度二次电池是最为有效的一个策略。近期,基于商用一次锂-亚硫酰氯锂电池衍生而来的锂/钠-氯二次电池因其高能量密度而备受关注,成为替代传统锂离子电池的有力竞争者。本文围绕锂/钠-氯二次电池的最新研究进展,综述了正极载体、负极及电解液等关键组分构建研究及其对电化学性能的影响。在正极载体方面,系统阐述了碳材料、共轭框架聚合物等载体设计对锂/钠-氯二次电池首次放电容量、可逆容量、倍率性能和温度的影响;在电解液方面,详细分析了针对反应机理、中间相产物和电解液腐蚀问题的解决策略;并简要介绍了适用于锂/钠-氯二次电池的新型合金负极。基于正极载体的理性设计与电解液系统优化,锂/钠-氯二次电池在新型二次电池领域已初现峥嵘,循环寿命可达500圈,尤其是在极端服役环境中表现优异(可在-80℃工作,电流密度最大可达16 A/g)。然而,氯物种转化动力学速率慢、活性氯物种利用率低以及氯物种对负极等的腐蚀难题仍然是限制其性能进一步提升的瓶颈,也是未来亟待解决的挑战所在。

关键词：锂/钠-氯二次电池高能量密度电极材料设计结构性能关系电化学反应动力学

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Vertical Graphenes Grown on a Flexible Graphite Paper as an All-Carbon Current Collector towards Stable Li Deposition

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Research 2020年第1期2020卷 1222-1232页

作者： Zhijia Huang debin kong Yunbo Zhang Yaqian Deng Guangmin Zhou Chen Zhang Feiyu Kang Wei Lv Quan-Hong Yang Shenzhen Geim Graphene Center(SGC) Tsinghua-Berkeley Shenzhen Institute(TBSI)Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Shenzhen Key Laboratory for Graphene-based Materials Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Lithium(Li)metal has been regarded as one of the most promising anode materials to meet the urgent requirements for the next-generation high-energy density ***,the practical use of lithium metal anode is hindered by the uncontrolled growth of Li dendrites,resulting in poor cycling stability and severe safety ***,vertical graphene(VG)film grown on graphite paper(GP)as an all-carbon current collector was utilized to regulate the uniform Li nucleation and suppress the growth of *** high surface area VG grown on GP not only reduces the local current density to the uniform electric field but also allows fast ion transport to homogenize the ion gradients,thus regulating the Li deposition to suppress the dendrite *** Li deposition can be further guided with the lithiation reaction between graphite paper and Li metal,which helps to increase lithiophilicity and reduce the Li nucleation barrier as well as the *** a result,the VG film-based anode demonstrates a stable cycling performance at a current density higher than 5mAcm^(-2)in half cells and a small hysteresis of 50mV at 1mAcm^(-2)in symmetric *** work provides an efficient strategy for the rational design of highly stable Li metal anodes.

关键词： cycling Vertical hysteresis

1000 Wh L-1 lithium-ion batteries enabled by crosslink-shrunk tough carbon encapsulated silicon microparticle anodes

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National Science Review 2021年第9期8卷 77-87页

作者： Fanqi Chen Junwei Han debin kong Yifei Yuan Jing Xiao Shichao Wu Dai-Ming Tang Yaqian Deng Wei Lv Jun Lu Feiyu Kang Quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Chemical Sciences and Engineering Division Argonne National Laboratory International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS) Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University

Microparticulate silicon（Si）, normally shelled with carbons, features higher tap density and less interfacial side reactions compared to its nanosized counterpart, showing great potential to be applied as high-energy lithium-ion battery anodes. However, localized high stress generated during fabrication and particularly,under operating, could induce cracking of carbon shells and release pulverized nanoparticles, significantly deteriorating its electrochemical performance. Here we design a strong yet ductile carbon cage from an easily processing capillary shrinkage of graphene hydrogel followed by precise tailoring of inner *** a structure, analog to the stable structure of plant cells, presents ‘imperfection-tolerance' to volume variation of irregular Si microparticles, maintaining the electrode integrity over 1000 cycles with Coulombic efficiency over 99.5%. This design enables the use of a dense and thick(3 m Ah cm–2) microparticulate Si anode with an ultra-high volumetric energy density of 1048 Wh L–1 achieved at pouch full-cell level coupled with a Li Ni0.8Co0.1Mn0.1O2cathode.

关键词： lithium-ion batteries anode silicon microparticles volumetric capacity mechanical stability

Enhanced Roles of Carbon Architectures in High-Performance Lithium-Ion Batteries

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Nano-Micro Letters 2019年第1期11卷 78-100页

作者： Lu Wang Junwei Han debin kong Ying Tao QuanHong Yang Nanoyang Group State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology

Lithium?ion batteries(LIBs), which are high?energy?density and low?safety?risk secondary batteries, are underpinned to the rise in electrochemical energy storage devices that satisfy the urgent demands of the global energy storage market. With the aim of achiev?ing high energy density and fast?charging performance, the exploitation of simple and low?cost approaches for the production of high capacity, high density, high mass loading, and kinetically ion?accessible electrodes that maximize charge storage and transport in LIBs, is a critical need. Toward the construction of high?performance electrodes, carbons are promisingly used in the enhanced roles of active materials, electrochemi?cal reaction frameworks for high?capacity noncarbons, and lightweight current collectors. Here, we review recent advances in the carbon engi?neering of electrodes for excellent electrochemical performance and structural stability, which is enabled by assembled carbon architectures that guarantee su cient charge delivery and volume fluctuation bu ering inside the electrode during cycling. Some specific feasible assem?bly methods, synergism between structural design components of carbon assemblies, and electrochemical performance enhancement are highlighted. The precise design of carbon cages by the assembly of graphene units is potentially useful for the controlled preparation of high?capacity carbon?caged noncarbon anodes with volumetric capacities over 2100 mAh cm^(-3). Finally, insights are given on the prospects and challenges for designing carbon architectures for practical LIBs that simultaneously provide high energy densities(both gravimetric and volumetric) and high rate performance.

关键词： Lithium-ion battery Carbon architecture Energy density Power density Assembly

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