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Evolution hydrothermal aging resistance mechanism study of zirconium and manganese doped CeO2 catalysts in soot catalytic combustion based on low Miller indices crystal surface effect

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Journal of Rare Earths 2024年第7期42卷 1272-1281页

作者： Zonglin Li Pan Wang Hong Ni Chengcheng Ao lidong zhang Hefeng zhang Kai Li School of Automotive and Traffic Engineering Jiangsu University State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental Science National Synchrotron Radiation Laboratory University of Science and Technology of China

The thermogravimetric analysis（TGA） experiments were carried out to reveal the mechanism of Zr and Mn doping on catalytic activity of CeO2catalyst both fresh and after hydrothermal aging,and the lattice morphology and valence changes were characterized by means of Brunauer-Emmett-Teller（BET）method,X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,and H2-temperature programmed reduction（H2-TPR）.Density functional theory（DFT） and molecular thermodynamics calculations were applied to investigate the change in catalytic activity,crystal surface energy and crystal morphology caused by hydrothermal aging.The maximum reaction rate temperature of fresh Mn/CeO2（389℃） is similar to that of CeO2（371℃） and lower than that of Zr/CeO2（447℃）,but the catalytic performance of CeO2decreases more severely after hydrothermal aging.The catalyst crystals show different degrees of crystal surface migration after hydrothermal aging,which leads to the reduction of Ce3+/Ce4+ratio and the active sites shift.DFT calculations indicate that the doping of Zr and Mn reduces the surface energy of the low Miller indices surface and increases the oxygen vacancy formation energy,leading to better thermal stability and lower catalytic activity.The Zr and Mn doping also changes the adsorption energy and Gibbs free energy of H2O,which dominates the migration of（1 1 1） to（1 1 0） and（1 0 0） in the vapor environment.The crystal surface migration mechanism of CeO2catalysts doped with Zr and Mn induced by H2O molecules at high temperature obtained in this study can provide a valuable addition to the regeneration of CeO2catalysts in the after-treatment systems of diesel engines.

关键词： CDPF CeO2-based catalyst DFT calculations Rare earth metal oxides Soot

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Light control of droplets on photo-induced charged surfaces

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National Science Review 2023年第1期10卷 259-267页

作者： Fang Wang Meijin Liu Cong Liu Chao Huang lidong zhang Anyang Cui Zhigao Hu Xuemin Du Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemistry and Molecular Engineering East China Normal University Technical Center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics and Advanced Instrument(Ministry of Education)Department of Physics School of Physics and Electronic Science East China Normal University

The manipulation of droplets plays a vital role in fundamental research and practical applications,from chemical reactions to bioanalysis.As an intriguing and active format,light control of droplets,typically induced by photochemistry,photomechanics,light-induced Marangoni effects or light-induced electric fields,enables remote and contactless control with remarkable spatial and temporal accuracy.However,current light control of droplets suffers from poor performance and limited reliability.Here we develop a new superamphiphobic material that integrates the dual merits of light and electric field by rationally preparing liquid metal particles/poly(vinylidene fluoride-trifluoroethylene) polymer composites with photo-induced charge generation capability in real time,enabling light control of droplets on the basis of photo-induced dielectrophoretic force.We demonstrate that this photo-induced charged surface(PICS)imparts a new paradigm for controllable droplet motion,including high average velocity(～35.9 mm s-1),unlimited distance,multimode motions(e.***.forward,backward and rotation) and single-to-multiple droplet manipulation,which are otherwise unachievable in conventional strategies.We further extend light control of droplets to robotic and bio-applications,including transporting a solid cargo in a closed tube,crossing a tiny tunnel,avoiding obstacles,sensing the changing environment via naked-eye color shift,preparing hydrogel beads,transporting living cells and reliable biosensing.Our PICS not only provides insight into the development of new smart interface materials and microfluidics,but also brings new possibilities for chemical and biomedical applications.

关键词： light control droplet manipulation smart surface liquid metal ferroelectric

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Confinement synergy at the heterointerface for enhanced oxygen evolution

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Nano Research 2023年第7期16卷 8793-8799页

作者： Dongdi Wang Shanshan Ruan Peiyu Ma Ruyang Wang Xilan Ding Ming Zuo lidong zhang Zhirong zhang Jie Zeng Jun Bao National Synchrotron Radiation Laboratory Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of SciencesKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China

Two-dimensional transition metal hydroxides with abundant reserves and low prices have played an indispensable role in energy catalytic applications.Recent reports indicated that the incorporation of Fe species into Co-based catalysts can synergistically enhance oxygen evolution reaction(OER)activity.Constructing a heterointerface on the surface of Co-based catalysts can provide a platform to investigate the role of heterointerface in reaction kinetics.Herein,we constructed a Fe-O-Co heterointerface without electronic effect by depositing FeO_(x)clusters on the oxygen vacancies of CoOOH surface.FeO_(x)/CoOOH exhibited excellent OER intrinsic activity,which can deliver the turnover frequency(TOF)of 4.56 s^(-1)at the overpotentials of 300 mV and the Tafel slope of 33 mV·dec^(-1).In-situ electrochemical impedance spectroscopy(EIS)and density functional theory(DFT)calculations demonstrated that the synergistic effect between Fe sites and Co sites confined at the Fe-O-Co heterointerface accelerated the charge transfer during OER and optimized the adsorption of oxygen intermediates,consequently enhancing OER.

关键词： clusters heterointerface confinement synergy oxygen evolution reaction

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Visible-light deposition of CrO_(x) cocatalyst on TiO_(2):Cr valence regulation for superior photocatalytic CO_(2)reduction to CH_(4)

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Journal of Energy Chemistry 2022年第1期31卷 103-112,I0004页

作者： Jingjing Dong Yuan Kong Heng Cao Zhiyu Wang Zhirong zhang lidong zhang Song Sun Chen Gao Xiaodi Zhu Jun Bao National Synchrotron Radiation Laboratory Collaborative Innovation Center of Chemistry for Energy MaterialsUniversity of Science and Technology of ChinaHefei 230029AnhuiChina Hefei National Laboratory for Physical Science at the Microscale and Department of Chemical Physics Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026AnhuiChina School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601AnhuiChina School of Physical Science University of Chinese Academy of SciencesBeijing 100049China

Photodeposition is widely adopted for implanting metal/metal oxide cocatalysts on semiconductors.However,it is prerequisite that the photon energy should be sufficient to excite the host semiconductor.Here,we report a lower-energy irradiation powered deposition strategy for implanting CrO_(x) cocatalyst on TiO_(2).Excitingly,CrO_(x)-400 implanted under visible-light irradiation significantly promotes the CH4 evolution rate on TiO_(2)to 8.4μmolg·^(-1)h^(-1) with selectivity of98%from photocatalytic CO_(2)reduction,which is 15 times of that on CrO_(x)-200 implanted under UV-visible-light irradiation.Moreover,CrO_(x)-400 is identified to be composed of higher valence Cr species compared to CrO_(x)-200.This valence states regulation of Cr species is indicated to provide more active sites for CO_(2) adsorption/activation and to modulate the reaction mechanism from single Cr site to Cr-Cr dual sites,thus endowing the superior CH_(4)production.This work demonstrates an alternative strategy for constructing efficient metal oxides cocatalysts on wide bandgap semiconductor.

关键词： Valence states regulation CrO_(x)cocatalyst Lower-energy irradiation Photocatalytic CO_(2)reduction High CH_(4)selectivity

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订单农业供应链的区块链溯源技术引入策略研究

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系统工程理论与实践 2024年第2期44卷 612-624页

作者：王俊斌张立冬江苏省社会科学院财贸研究所南京210004 常熟理工学院商学院苏州215500

区块链技术赋能乡村产业发展对我国推进乡村振兴具有重要意义,本研究考虑了消费者对“上链”农产品的偏好行为,构建由农户、公司、消费者组成的订单农业供应链系统模型,探究了区块链溯源技术引入的最优策略.通过模型分析,对比了不同区... 详细信息

区块链技术赋能乡村产业发展对我国推进乡村振兴具有重要意义,本研究考虑了消费者对“上链”农产品的偏好行为,构建由农户、公司、消费者组成的订单农业供应链系统模型,探究了区块链溯源技术引入的最优策略.通过模型分析,对比了不同区块链技术引入模式下农户或公司的区块链节点投入、种植面积、收购价格最优决策,及其对公司利润、消费者剩余和社会福利的影响.研究发现:首先,当区块链投资的成本效应相对较小时,只有公司(或供应链下游)引入区块链;当区块链投资的成本效应相对较大时,则农户和公司(或全链条)同时采用区块链.其次,在订单农业供应链中公司比农户更有意愿引入区块链,农户存在“搭便车”的动机,进而在特定条件下不引入区块链.最后,均衡状态下的区块链引入策略均是帕累托有效的;但是,在仅有公司(或供应链下游)引入区块链成为均衡策略时,消费者总剩余和社会福利存在一定的损失;此时,公司或政府可以考虑补贴农户以避免这些损失.

关键词：区块链订单农业供应链农业数字化社会福利分析模型

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Molecular movements of trehalose inside a single network enabling a rapidly-recoverable tough hydrogel

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International Journal of Smart and Nano Materials 2022年第4期13卷 575-596页

作者： Xiaowen Huang Jimin Fu Huiyan Tan Yan Miu Mengda Xu Qiuhua Zhao Yujie Xie Shengtong Sun Haimin Yao lidong zhang School of Chemistry and Molecular Engineering East China Normal UniversityShanghaiChina Department of Mechanical Engineering the Hong Kong Polytechnic UniversityHong Kong SARChina State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyCenter for Advanced Low-dimension MaterialsDonghua UniversityShanghaiChina The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenChina

It remains a challenge to achieve rapidly recoverable hydrogels by molecular hydrogen-bonding interaction because of its slow inter-action kinetics.This work for the first time reports a trehalose(Tre)-based molecular movement mechanism inside a single network of polyacrylamide(PAM)that accelerates the kinetics of hydrogenbonding interaction,and thereby endows the hydrogel with high toughness and rapid shape and mechanical recoverability.The resultant PAM@Tre hydrogel is capable of full shape recovery after 10,000 loading/unloading cycles at a strain of 500%.Even after being stretched at a strain of 2500%,it can recover to its original shape within 10 seconds.Moreover,the molecular movement of trehalose also endows the PAM@Tre hydrogel with fracture energy and toughness as high as~9000 J m^(-2) and~1600 kJ m^(-3),respec-tively,leading to strong resistance to both static and dynamic piercing.The PAM@Tre hydrogel is thus believed to have enormous potentials in protection devices,bionic skin,soft actuator,and stretchable electronics.

关键词： molecular motility highly recoverable tough hydrogels puncture resistance molecular dynamics simulation

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基于全连接的长短期记忆网络实现采空区CO多步预测

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清华大学学报（自然科学版） 2024年第6期64卷 940-952页

作者：罗振敏张利冬宋泽阳西安科技大学安全科学与工程学院西安710054 陕西省工业过程安全与应急救援工程技术研究中心西安710054

煤自燃是煤矿的主要自然灾害之一。煤自燃的物理化学过程十分复杂,且影响因素众多,给煤自燃危险性的预测带来很大的挑战。利用深度学习理论与方法加强对煤自燃危险性预测技术的研究,有助于提升煤矿安全生产智能化管控水平。该研究运用... 详细信息

煤自燃是煤矿的主要自然灾害之一。煤自燃的物理化学过程十分复杂,且影响因素众多,给煤自燃危险性的预测带来很大的挑战。利用深度学习理论与方法加强对煤自燃危险性预测技术的研究,有助于提升煤矿安全生产智能化管控水平。该研究运用循环神经网络(RNN)、长短期记忆(LSTM)网络和门控循环单元(GRU)3种算法,建立了采空区CO动态序列预测模型。对数据集进行特征变量分布检验以及数据归一化处理,降低了变量依赖性。在模型构建过程中,添加了全连接层和Dropout类以避免模型出现过拟合,通过均方误差确定模型的选代次数,引入了平均绝对误差、均方根误差和确定系数3个模型性能检验指标,分析优化了模型的参数,检验了模型性能。研究结果表明:RNN、LSTM和GRU模型均能实现对CO体积分数的动态预测,且误差小于1%;在同一序列数据下,LSTM模型预测精度最高,其次是RNN模型和GRU模型。

关键词：煤自燃 CO体积分数预测长短期记忆(LSTM)网络深度学习

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中国水生蔬菜作物野生近缘种多样性热点区域模拟

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浙江大学学报（农业与生命科学版） 2024年第2期50卷 258-269页

作者：张立冬邢凯峰朱仔伟张剑戎俊赵耀南昌大学生命科学学院江西南昌330031 鄱阳湖环境与资源利用教育部重点实验室(南昌大学) 江西南昌330031 江西鄱阳湖湿地保护与恢复国家长期科研基地/江西鄱阳湖湿地生态系统国家定位观测研究站江西南昌330031 江西省林业科学院江西南昌330013

水生蔬菜作物是长江流域农耕文明驯化作物中的独特类群,其野生近缘种是育种和品种改良的宝贵遗传资源。本研究从中国植物+物种信息系统和中国数字植物标本馆获取了10种水生蔬菜作物的36个野生近缘种的地理分布数据并进行了校对,结合相... 详细信息

水生蔬菜作物是长江流域农耕文明驯化作物中的独特类群,其野生近缘种是育种和品种改良的宝贵遗传资源。本研究从中国植物+物种信息系统和中国数字植物标本馆获取了10种水生蔬菜作物的36个野生近缘种的地理分布数据并进行了校对,结合相应的气候因子数据,使用最大熵模型(maximum entropy model,MaxEnt)构建生态位模型,并对物种未来分布变化进行预测。结果表明:水生蔬菜作物野生近缘种多样性热点区域主要位于长江中下游的洞庭湖和鄱阳湖流域,与长江流域农耕文明起源地相重合,表明农耕文明对植物资源的就近利用。在未来升温的气候情景下,水生蔬菜作物野生近缘种适宜分布热点区域可能会进一步扩张,多样性热点区域中心向高纬度地区迁移,这有利于水生蔬菜作物野生近缘种多样性的维持和提升,并为其保护提供了理论依据。

关键词：水生蔬菜作物野生近缘种多样性热点区域最大熵模型气候变化

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普通油茶良种资源表型性状多样性分析与综合评价

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浙江大学学报（农业与生命科学版） 2024年第2期50卷 244-257页

作者：邢凯峰张剑陈尚张立冬谢昊星赵耀戎俊南昌大学生命科学学院江西南昌330031

普通油茶(Camellia oleifera)是我国总产油量最高、栽培面积最广的木本油料作物。为促进我国普通油茶良种资源的挖掘与利用,本研究使用主成分分析、相关性分析、聚类分析、巢式方差分析、多元回归分析等方法以及变异系数、表型分化系数... 详细信息

普通油茶(Camellia oleifera)是我国总产油量最高、栽培面积最广的木本油料作物。为促进我国普通油茶良种资源的挖掘与利用,本研究使用主成分分析、相关性分析、聚类分析、巢式方差分析、多元回归分析等方法以及变异系数、表型分化系数、香农-维纳多样性指数,探究560份普通油茶良种资源的表型性状多样性及其与环境因子的相关性,并使用熵权TOPSIS法对560份普通油茶良种资源进行综合评价和排序。结果表明,560份普通油茶良种资源存在丰富的遗传多样性,34个表型性状的香农-维纳多样性指数为0.05~2.35,均值为1.06,数量性状的变异系数为3.02%~53.33%,均值为23.25%。普通油茶良种资源34个表型性状种源间和种源内的方差分量均值分别为53.591%和32.382%,说明普通油茶良种资源表型性状种源内相似性较高,其分化主要来自种源间。随着纬度的升高和年平均温度的降低,普通油茶良种资源平均单果质量、种仁含油率及饱和脂肪酸含量呈现下降趋势,而不饱和脂肪酸含量呈现上升趋势,表明纬度和年平均温度是限制普通油茶生长的主要因子。熵权TOPSIS法综合评价和排序结果显示,长林4号综合得分指数最高,浙江、云南、安徽、湖南等地区均有多个选育的良种综合排名在前30以内。本研究结果为普通油茶育种及良种推广提供了数据支撑。

关键词：普通油茶良种资源表型性状熵权TOPSIS法综合评价

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Geochronological Framework of Paleoproterozoic Intrusive Rocks and Its Constraints on Tectonic Evolution of the Liao-Ji Belt,Sino-Korean Craton

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Journal of Earth Science 2021年第1期32卷 8-24页

作者： Jingsheng Chen Zhongzhu Yang Dexin Tian Dehe Xing lidong zhang Fan Yang Bin Li Miao Liu Yi Shi Chao zhang Shenyang Geological Survey Center of China Geological Survey Shenyang 110034China Non-Ferrous Metals Geological Exploration Bureau of Zhejiang Province Shaoxing 312000China

The Liao-Ji belt(LJB)is one of the Paleoproterozoic tectonic belts located in the North China Craton.A large number of Paleoproterozoic meta-volcanic-sedimentary rock and intrusive rocks are preserved in the LJB,which provide reliable carriers for the study of the Paleoproterozoic tectonic evolution of the North China Craton.The Paleoproterozoic intrusive rock in the LJB can be divided into the following seven types:syenogranite,quartz diorite,porphyry granite,migmatitic granite,sye-nite,metamorphic plutonic rock,and granitic pegmatite and metagabbro(metamorphic diabase).Zir-con U-Pb dating of 15 samples from intrusive rocks was carried out in this study.The chronology framework of the Paleoproterozoic intrusive rock in the LJB was established,and the magmatism of intrusive rocks can be divided into three stages:2200 to 2110,2010 to 1937,1900 to 1820 Ma.The chronological framework supported the evolution model of subduction accretionary arc-continent colli-sion in the LJB effectively.Combined with previous geochemical work,it was a passive continental margin environment at approximately 2200 Ma,and then transformed into and active continental margin.The bimodal intrusive rocks between 2180 and 2150 Ma indicated a back-arc tension envi-ronment which lasted until approximately 2110 Ma with a large number of basic intrusive rocks.And then the back-arc basin began to contract and the magmatic activities were reduced,with only a small number of intrusive rock activities occurring at approximately 2040,2010 and 1937 Ma.After the orogenic activities,there was a post-orogenic extension stage from 1900 to 1820 Ma.Magmatic activi-ties caused by the environmental extension started to occur more frequently and subsequently resulted in the large-scale intrusive rocks in eastern Liaoning.

关键词： Liao-Ji belt Paleoproterozoic intrusive rocks geochronological framework tectonic evolution

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