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Modified Cu active sites by alloying for efficient electrocatalytic reduction CO_(2) to CO

Journal of Energy Chemistry 2024年第12期99卷 450-457页

作者： Yan Wang Ruikuan Xie Naixuan Ci Zhiyuan Zhu Chaoyi Li Guoliang Chai Hua-Jun Qiu Yinghe Zhang Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Science Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina

Transition metals like Au,Ag,and Cu have been reported to be quite active for CO_(2) *** this study,we use density functional theory(DFT)calculation to investigate the electronic structure and catalytic performance of Au,Ag,Cu and their alloys for CO_(2) reduction reaction(CO_(2)RR).Theoretical calculations identified the combination of Ag,Cu,and Au in a face-centered cubic(fcc)alloy as an outstanding electrocatalyst for CO_(2) reduction to CO,with Cu as the active *** d-orbital projected density of state(PDOS)profile suggests that alloying alters the electronic structure of the Cu site,thereby affecting the Gibbs free energy change for the formation of*COOH intermediate(ΔG_(*COOH)).To demonstrate the theoretical prediction experimentally,we employ a top-down dealloying approach to synthesize a nanoporous structured AgCuAu alloy(NP-Ag_(5)Cu_(5)Au_(5)).Electrochemical experiments validate that the ternary alloy catalyst is clearly better than unary and binary catalysts,showing a Faradaic efficiency(FE)for CO over 90%across a broad potential range of 0.6 V,with a peak of approximately 96%at-0.573 V *** study underscores the potential of multi-component alloys in CO_(2)RR and establishes a theoretical basis for designing efficient catalysts for CO_(2) utilization.

关键词： CO_(2)reduction CO Multi-component alloy Nano-porous Electrocatalyst

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Fluorinated Colorless Polyimides with High Heat-resistance and Low Birefringence

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Chinese Journal of Polymer science 2023年第10期41卷 1599-1608页

作者： Bing-Yu Zou Lu-Hao Qiu Huan-Yu Lei Jin-Ming Liu Wei-Feng Peng Hong-Qin Zhao Feng Bao Ming-Jun Huang South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou510640China Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou510640China

The development of optical films with high transparency,high thermal resistance and low birefringence remains a challenge in the flexible display *** this work,we designed and synthesized a series of fluorinated colorless polyimides(CPIs)materials using 2,5-substituted m-phenylenediamine diamine monomers and 1,2,4,5-cyclohexanetetracarboxylic dianhydride(CHDA).We systematically studied the effects of fluorinated group substitutions on the thermal,mechanical,optical and dielectric properties of CPI *** introduction of alicyclic CHDA dianhydride affords high transparency and low yellowness,while the 2,5-substituted m-phenylenediamine diamines offer the CPIs with quite low birefringence as well as high glass transition temperatures.A particular CHDA/o3FBDA film with simple chemical structure stands out,exhibiting well-balanced overall properties.

关键词： Colorless polyimide Low birefringence Fluorinated Optical flm

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Multidimensional defects tailoring local electron and Mg^(2+) diffusion channels for boosting magnesium storage performance of WO_(3)/MoO_(2)

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Journal of Energy Chemistry 2023年第9期84卷 476-485页

作者： Shiqi Ding Yuxin Tian Jiankang Chen He Lv Amin Wang Jingjie Dai Xin Dai Lei Wang Guicun Li Alan Meng Zhenjiang Li College of Materials Science and Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Engineering Research Center for New Metallic Functional Materials Characteristic Laboratory of Advanced Metal Functional Materials and Processing in Universities of ShandongQingdao Binhai UniversityQingdao 266555ShandongChina College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina

Defect engineering presents great promise in addressing lower specific capacity,sluggish diffusion kinetics and poor cycling life issues in energy storage ***,multidimensional(0D/2D/3D) structural defects are constructed in WO_(3)/MoO_(2) simultaneously via competing for and sharing with O atoms during simple hydrothermal *** and 2D defects tailor local electron,activating more sites and generating built-in electric fields to yield ion reservoir,meanwhile,3D defect owning lower anisotropic property tailors Mg^(2+) diffusion channels to fully exploit Mg^(2+) adsorbed sites induced by OD and 2D defects,enhance the kinetics and maintain structural *** from synergistic effect of 0D/2D/3D structural defects,the designed WO_(3)/MoO_(2) shows the higher specific capacity(112.8 mA h g^(-1) at 50 mA g^(-1) with average attenuation rate per cycle of 0.068%),superior rate capability and excellent cycling stability(specific capacity retention of 80% after 1500 cycles at 1000 mA g^(-1)).This strategy provides design ideas of introducing multidimensional structural defects for tailoring local electron and microstructure to improve energy storage property.

关键词： Multidimensional defects Local electron tailoring Heterostructure Cathode Magnesium ions batteries

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MOFs in Emerging Solar Cells

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Chinese Journal of Chemistry 2023年第6期41卷 695-709页

作者： Jie Dou Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Centerof Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing100081China Bejing Instituteof Technology Chongqing Innovation Center Chongqing 404100China

Metal-organic framework(MOF)materials have attracted intense scientific interest in the solar cell research community owing to their unique physiochemical properties and various preparation *** photovoltaic performance and stability of resultant optoelectronic devices can also be improved by adopting MOF *** review pays close attention to the summary and generalization of recent representative achievements in solar cells by utilizing MOFs,including dye-sensitized solar cells,perovskite solar cells,organic solar cells,and so on.

关键词： MOFs Synthetic methods Solar cells Photochemistry Sustainable chemistry Green chemistry

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Engineering miniature gold nanorods with tailorable plasmonic wavelength in NIR region via ternary surfactants mediated growth

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Nano Research 2023年第4期16卷 5087-5097页

作者： Xiaoning Luo Xiaoyuan Wang Lingli Zhang Liping Song Zhiwei Sun Yu Zhao Fengmei Su Youju Huang College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China National Synchrotron Radiation Laboratory CAS Key Laboratory of Soft Matter ChemistryAnhui Provincial EngineeringLaboratory of Advanced Functional Polymer FilmUniversity of Science and Technology of ChinaHefei 230026China National Engineering Research Centre for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002China

Plasmonic nanoparticles are endowed profound capability for sensing,biomedicine,and cancer ***,the inaccessibly adjustable wavelength in near infrared(NIR)region window and size limit for the particles penetration in tumor strongly hinder their *** gold nanorods(mini-Au NRs)with diameter less than 12 nm can effectively address this challenge due to the tiny size and tailorable NIR ***,we adopt ternary surfactants(hexadecyl trimethyl ammonium bromide(CTAB),sodium oleate(NaOL),and sodium salicylate(NaSal))mediated growth strategy to precisely synthesize miniature Au NRs under micelle ***,the selectively dense accumulation of ternary surfactants can efficiently improve the micellar stacking parameters(p)and lower micellar free energy(F),further tends to achieve the formation of Au NRs with tiny diameter and high *** with that of conventional methods,the purity of mini-Au NRs up to 100%can be dramatically improved via varying the relative concentration of ternary *** diameter of Au NRs can be dynamically controlled to 6,8,and 11 nm through regulating the concentration of silver nitrate and the mole ratio of ternary *** ternary surfactants system is favorable for the aging of tiny Au NRs,and further enables the aspect ratio-tunable in the region from 2.70 to 7.32,as well as tailorable plasmonic wavelength in wide NIR window from 700 to 1,147 ***,our findings shed a light on the precise preparation of small sized plasmonic nanoparticles and pave the way to applications in biomedicine,imaging,and cancer therapy.

关键词： miniature gold nanorods ternary surfactants seed mediated growth method near infrared(NIR)region photothermal

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Crystallography of precipitates in Mg alloys

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Journal of Magnesium and Alloys 2021年第2期9卷 416-431页

作者： Zhang-Zhi Shi Hong-Ting Chen Ke Zhang Fu-Zhi Dai Xue-Feng Liu Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Key Laboratory for Advanced Materials Processing of Ministry of EducationSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

Crystallography of precipitates in Mg alloys is indispensable to explain and predict alloy microstructures and *** order to obtain a global understanding of diversified experimental results,a general theory of singular interface is introduced,which provides the physical base and calculation methodology for interpreting precipitate morphology and orientation relationship(OR),especially useful for understanding irrational facets and *** by the theory,recent experimental findings are systematically summarized,including thermally stable and metastable precipitates with various crystal ***,theoretical advances inspired by the findings are introduced,which deepens our understanding on OR selection and preference of irrational *** last,future research directions in this field are proposed.

关键词： Mg alloys Precipitation Facet Orientation relationship

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Direct Synthesis of Layer-Tunable and Transfer-Free Graphene on Device-Compatible Substrates Using Ion Implantation Toward Versatile Applications

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Energy & Environmental Materials 2024年第5期7卷 408-418页

作者： Bingkun Wang Jun Jiang Kevin Baldwin Huijuan Wu Li Zheng Mingming Gong Xuehai Ju Gang Wang Caichao Ye Yongqiang Wang Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China Key Laboratory of Soft Chemistry and Functional Materials of MOE School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Center for Integrated Nanotechnologies Los Alamos National LaboratoryLos Alamos 87545New MexicoUSA National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Academy for Advanced Interdisciplinary Studies&Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and TechnologyShenzhen 518055China Materials Science and Technology Division Los Alamos National LaboratoryLos Alamos 87545New MexicoUSA

Direct synthesis of layer-tunable and transfer-free graphene on technologically important substrates is highly valued for various electronics and device *** of the art in the field is currently a two-step process:a high-quality graphene layer synthesis on metal substrate through chemical vapor deposition(CVD)followed by delicate layer transfer onto device-relevant ***,we report a novel synthesis approach combining ion implantation for a precise graphene layer control and dual-metal smart Janus substrate for a diffusion-limiting graphene formation to directly synthesize large area,high quality,and layer-tunable graphene films on arbitrary substrates without the post-synthesis layer transfer ***(C)ion implantation was performed on Cu-Ni film deposited on a variety of device-relevant substrates.A well-controlled number of layers of graphene,primarily monolayer and bilayer,is precisely controlled by the equivalent fluence of the implanted C-atoms(1 monolayer~4×10^(15)C-atoms/cm^(2)).Upon thermal annealing to promote Cu-Ni alloying,the pre-implanted C-atoms in the Ni layer are pushed toward the Ni/substrate interface by the top Cu layer due to the poor C-solubility in *** a result,the expelled C-atoms precipitate into a graphene structure at the interface facilitated by the Cu-like alloy *** removing the alloyed Cu-like surface layer,the layer-tunable graphene on the desired substrate is directly *** layer-selectivity,high quality,and uniformity of the graphene films are not only confirmed with detailed characterizations using a suite of surface analysis techniques but more importantly are successfully demonstrated by the excellent properties and performance of several devices directly fabricated from these graphene *** dynamics(MD)simulations using the reactive force field(ReaxFF)were performed to elucidate the graphene formation mechanisms in this novel synthesis *** the wide use of ion

关键词： device applications dual-metal smart Janus substrate growth mechanism Ion implantation layer-tunable and transfer-free graphene

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Multiscale structural engineering of carbon nitride for enhanced photocatalytic H2O2 production

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Nano Research 2023年第4期16卷 4524-4530页

作者： Qing He Bounxome Viengkeo Xuan Zhao Zhengyuan Qin Jie Zhang Xiaohan Yu Yongpan Hu Wei Huang Yanguang Li Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center for Advanced MicrostructuresNanjing UniversityNanjing 210093China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao 999078China

Carbon nitride(C_(3)N_(4))holds great promise for photocatalytic H_(2)O_(2)production from oxygen *** spite of great research efforts,they still suffer from low catalytic efficiency primarily limited by the fast recombination of photogenerated charge *** this work,we report the multiscale structural engineering of C_(3)N_(4)to significantly improve its optoelectronic properties and consequently photocatalytic *** product consists of porous spheres with high surface areas,abundant nitrogen defects,and alkali metal *** visible light irradiation,our catalyst shows a remarkable H_(2)O_(2)production rate of 3,080μmol·g^(−1)·h^(−1),which is more than 10 times higher than that of bulk C_(3)N_(4)and exceeds those of most other C_(3)N_(4)-based ***,the catalyst exhibits great stability,and can continuously work for 15 h without obvious activity decay under visible light irradiation,eventually giving rise to a high H_(2)O_(2)concentration of ca.45 mM.

关键词： photocatalytic H_(2)O_(2)production oxygen reduction carbon nitride multiscale structural engineering

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Enhanced piezoelectric properties and thermal stability of LiNbO_(3)-modified PNN-PZT ceramics

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Journal of Materiomics 2024年第5期10卷 995-1003页

作者： Wei Peng Jianglei Chang Jianwei Zhao Dawei Wang Zhen Liu Genshui Wang Shuxiang Dong Institute for Advanced Study Shenzhen UniversityShenzhen518060China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China School of Instrumentation Science and Engineering Harbin Institute of TechnologyHarbin150080China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai201899China

Piezoelectric PZT ceramics with high piezoelectric properties and good thermal stability are urgently desired concerning the practical *** compositions of LiNbO_(3) modified Pb(Ni_(1/3)Nb_(2/3))O_(3)single bondPbZrO_(3)single bondPbTiO_(3) ceramics have been prepared in this *** effects of the introduction of the LiNbO_(3) on the system were comprehensively investigated in terms of the phase structure,microstructure,electric properties,and thermal stability behavior of the *** compositions are located in the morphotropic phase boundary(MPB)region,and the ratio of the rhombohedral(R)phase increases obviously with the increase of LiNbO_(3) *** increasing the LiNbO_(3) content,the piezoelectric properties were significantly *** sample added with 2%(in mole)LiNbO_(3) shows excellent electric properties,including T_(m)=185℃,εr=5,643,k_(p)=0.626,Q_(m)=51,d_(33)=902 pC/*** importantly,no thermal depolarization behavior was observed in the temperature range of 25–100℃.For PNN-PZT-x%LN ceramics,which is mainly attributed to the pinning effect resulted by the(Li_(Pb)-Nb_(Zr/Ti)) defect dipoles.

关键词： PNN-PZT LiNbO_(3) Piezoelectric property Defect dipole Thermal stability

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Excellent energy storage performance in Bi_(0.5)Na_(0.5)TiO_(3)-based lead-free high-entropy relaxor ferroelectrics via B-site modification

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Journal of advanced Ceramics 2024年第3期13卷 345-353页

作者： Kaihua Yang Gengguang Luo Li Ma Ruoxuan Che Zhiyi Che Qin Feng Zhenyong Cen Xiyong Chen Jiajun Zhou Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Optical and Electronic Information Key Lab of Functional Materials for Electronic Information(B)of Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074China

Next-generation advanced high/pulsed power capacitors urgently require dielectric materials with outstanding energy storage ***_(0.5)Na_(0.5)TiO_(3)-based lead-free materials exhibit high polarization,but the high remanent polarization and large polarization hysteresis limit their applications in dielectric ***,high-entropy perovskite relaxor ferroelectrics(Na_(0.2)Bi_(0.2)Ba_(0.2)Sr_(0.2)Ca_(0.2))(Ti1-x%Zrx%)O_(3)are designed by adding multiple ions in the A-site and replacing the B-site Ti^(4+)with a certain amount of Zr^(4+).The newly designed system showed high relaxor feature and slim polarization-electric(P-E)***,improved relaxor feature and obviously delayed polarization saturation were found with the increasing of Zr^(4+).Of particular importance is that both high recoverable energy storage density of 6.6 J/cm^(3) and energy efficiency of 93.5%were achieved under 550 kV/cm for the ceramics of x=6,accompanying with excellent frequency stability,appreciable thermal stability,and prosperous discharge *** work not only provides potential dielectric materials for energy storage applications,but also offers an effective strategy to obtain dielectric ceramics with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.

关键词： energy storage density (Bi_(0.5)Na_(0.5))TiO_(3) high-entropy perovskite ceramics polarization saturation relaxor ferroelectrics(RFEs)

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