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Improving hydrogen evolution reaction efficiency through lattice tuning

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Nano Research 2024年第7期17卷 5907-5913页

作者： Zipeng Zhao Haotian Liu Wenpei Gao Praveen Kolla Wang Xue Zeyan Liu Jinghua Guo Sanjeev Mukerjee Xiaoqing Pan Qingying Jia Xiangfeng Duan Yu Huang department of Materials Science and Engineering University of CaliforniaLos AngelesCalifornia 90095USA department of Chemical Engineering and Materials Science University of CaliforniaIrvineCalifornia 92697USA Materials Science and Engineering North Carolina State UniversityRaleighNorth Carolina 27695USA department of chemistry and Chemical Biology Northeastern UniversityBostonMassachusetts 02115USA department of chemistry and biochemistry University of CaliforniaLos AngelesCalifornia 90095USA Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA department of chemistry and biochemistry University of CaliforniaSanta CruzCalifornia 95064USA department of Physics and Astronomy University of CaliforniaIrvineCalifornia 92697USA california Nanosystems Institute University of CaliforniaLos AngelesCalifornia 90095USA

The intermittent nature of renewable energy sources sets a requirement for efficient energy storage to mitigate the conflict between energy supply and *** is a promising choice for energy storage due to its high energy ***,the conversion of electrical energy to chemical energy stored in hydrogen through water electrolysis suffers from low efficiency,and the electricity cost dominates the total cost of hydrogen ***,we report the study of improving the hydrogen evolution reaction activity of Pt-based catalysts by building a nanoscale surface NiO and Pt interface,further optimizing the performance via tuning the lattice parameter of the core of nanoparticles,which can be achieved by varying the dealloying annealing *** optimized PtCuNi-O/C and PtNi-O/C catalysts are demonstrated to be one of the best catalysts,with a mass activity(MA)of 9.1 and 8.7 mA/μgPt,which is 9.9-fold and 9.5-fold of that of Pt/C,respectively.

关键词： lattice tuning Pt-based catalyst hydrogen evolution reaction electrocatalysis

Review Article Li-current collector interface in lithium metal batteries

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Nano Research 2024年第10期17卷 8706-8728页

作者： Tian-Yu Wang Dingyi Zhao Keyue Liang Yuzhang Li department of Chemical and Biomolecular Engineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA

Interfaces within batteries,such as the widely studied solid electrolyte interface(SEI),profoundly influence battery *** these interfaces,the solid-solid interface between electrode materials and current collectors is crucial to battery performance but has received less discussion and *** review highlights the latest research advancements on the solid-solid interface between lithium metal(the next-generation anode)and current collectors(typically copper),focusing on factors affecting the Li-current collector interface and improvement strategies from perspectives of current collector substrate(lithiophilicity,crystal facets,mechanical properties,and topological structure),electrolyte chemistry,current density,stacking pressure,SEI,electric field and temperature,and provides a future directions and opportunities on this topic.

关键词： lithium metal anode current collectors Li-current collector interface solid-solid interface improvement strategies

Precision Control of Amphoteric Doping in Cu_(x)Bi_(2)Se_(3) Nanoplates

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Precision chemistry 2024年第8期2卷 421-427页

作者： Huaying Ren Jingxuan Zhou Ao Zhang Zixi Wu Jin Cai Xiaoyang Fu Jingyuan Zhou Zhong Wan Boxuan Zhou Yu Huang Xiangfeng Duan department of chemistry and biochemistry University of CaliforniaLos AngelesLos AngelesCalifornia 90095United States department of Materials Science and Engineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095United States department of Materials Science and Engineering and california NanoSystems Institute University of CaliforniaLos AngelesLos AngelesCalifornia 90095United States california NanoSystems Institute University of CaliforniaLos AngelesLos AngelesCalifornia 90095United States

Copper-doped Bi_(2)Se_(3)(Cu_(x)Bi_(2)Se_(3))is of considerable interest for tailoring its electronic properties and inducing exotic charge correlations while retaining the unique Dirac surface ***,the copper dopants in Cu_(x)Bi_(2)Se_(3) display complex electronic behaviors and may function as either electron donors or acceptors depending on their concentration and atomic sites within the Bi_(2)Se_(3) crystal ***,a precise understanding and control of the doping concentration and sites is of both fundamental and practical ***,we report a solution-based one-pot synthesis of Cu_(x)Bi_(2)Se_(3) nanoplates with systematically tunable Cu doping concentrations and doping *** studies reveal a gradual evolution from intercalative sites to substitutional sites with increasing Cu *** Cu atoms at intercalative sites function as electron donors while those at the substitutional sites function as electron acceptors,producing distinct effects on the electronic properties of the resulting *** further show that Cu_(0.18)Bi_(2)Se_(3) exhibits superconducting behavior,which is not present in Bi_(2)Se_(3),highlighting the essential role of Cu doping in tailoring exotic quantum *** study establishes an efficient methodology for precise synthesis of Cu_(x)Bi_(2)Se_(3) with tailored doping concentrations,doping sites,and electronic properties.

关键词： Cu_(x)Bi_(2)Se_(3) nanoplates amphoteric doping solution-based synthesis doping sites conducting thin film superconductivity

Antigen-specific mRNA lipid nanoparticle platforms for the prevention and treatment of allergy and autoimmune diseases

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BMEMat(BioMedical Engineering Materials) 2024年第2期2卷 61-68页

作者： Emma Y.Yim Amanda C.Zhou Yvonne C.Yim Xiang Wang Tian Xia department of Molecular Cell and Developmental BiologyUniversity of CaliforniaLos AngelesUSA department of Bioengineering University of CaliforniaLos AngelesUSA department of chemistry and biochemistry University of CaliforniaLos AngelesUSA Division of NanoMedicine Department of MedicineCenter for Environmental Implications of Nanotechnology(UC CEIN)California NanoSystems InstituteUniversity of CaliforniaLos AngelesUSA

While most nanomedicines primarily aim to stimulate the immune system against infections or tumors,there is a growing demand for inducing immune tolerance under certain conditions,such as allergic and autoimmune *** have explored nanotechnology-based strategies to induce immune tolerance in a targeted and specific *** approach involves the use of nanoparticles(NPs)to encapsulate immunosuppressive drugs and/or antigens to educate naïve T cells and promote the generation of antigen-specific regulatory T cells that inhibit immune ***,this approach has certain *** hydrophobicity of proteins or peptides restricts the degree to which they can be encapsulated in NPs,which in turn,affects their loading efficiency and treatment *** the emergence of mRNA lipid nanoparticle(LNP)platforms,there is the possibility of overcoming the limitations of protein and peptide *** date,mRNA LNP systems have been shown to provide organ,cellular,and subcellular targeting for the induction of immune *** method of drug delivery is flexible and scalable that can be customized for a specific patient,resulting in an effective means of administering relevant proteins or epitopes to induce antigen-specific immune *** continued research and development,this technology could offer a safer and more effective alternative to current therapies,ultimately improving the quality of life of patients worldwide.

关键词： allergy autoimmune diseases immune tolerance mRNA lipid nanoparticle nanomedicine

Stable hydrogen-bonded organic frameworks and their photo-and electro-responses

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Nano Research 2024年第8期17卷 7675-7699页

作者： Ying Hou Xin-Song Huang Sheng-Hao Gong Chen Liu Yangyang Liu Tian-Fu Liu State Key Laboratory of Structural chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China university of Chinese Academy of Sciences Beijing 100049China department of chemistry and biochemistry California State UniversityLos AngelesCalifornia 90032USA College of chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China

Hydrogen-bonded organic frameworks(HOFs)are a recent class of porous materials that have garnered considerable research interest owing to their distinctive *** can be constructed through judicious selection of H-bonding motifs,which are further enforced by other weak intermolecular interactions such asπ–πstacking,van der Waals forces,and framework *** advantage of these interactions,we can expand the functional field of HOFs by introducing active ***,researchers have made substantial advancements in using HOFs for chemical sensing,catalysis,proton conduction,biological applications,and *** low bonding energy of H-bonds allows for precise control over the concentration of ligands in solvents,forming diverse HOF *** varied structures offer significant advantages for producing HOFs with photo-responsive and electro-responsive ***,the presence of H-bonds in HOFs results in their inherent lower stability compared to metal-organic frameworks(MOFs)and covalent-organic frameworks(COFs)formed via coordination and covalent bonds,*** a result,the pursuit of stable and innovative HOF materials with novel functional sites remains an ongoing *** review provides an overview of recent research progress in the development of new strategies for stable HOF synthesis and applications of HOFs with stimuli-responsive *** first classified all synthetic methods reported to date and discussed the stable HOFs synthesized,as well as their unique properties and *** addition,we summarized the applications of HOFs utilizing their synergistic responses to external stimuli,including photo,electrical,pressure,and chemical *** systematically reviewed stable HOF synthesis and applications,which may lead to a deeper understanding of the structure–activity relationship for these materials and guide future HOF design.

关键词： stable hydrogen-bonded organic frameworks(HOFs) photo-response electro-response photoelectric synergistic response

Deciphering the controlling factors for phase transitions in zeolitic imidazolate frameworks

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National Science Review 2024年第4期11卷 151-163页

作者： Tao Du Shanwu Li Sudheer Ganisetti Mathieu Bauchy Yuanzheng Yue Morten M.Smedskjaer department of chemistry and Bioscience Aalborg University department of Mechanical Engineering-Engineering Mechanics Michigan Technological University Physics of Amo Rphous and Inorganic Solids Laboratory(PARISlab) Department of Civil and Environmental EngineeringUniversity of CaliforniaLos Angeles

Zeolitic imidazolate frameworks（ZIFs） feature complex phase transitions, including polymorphism,melting, vitrification, and polyamorphism. Experimentally probing their structural evolution during transitions involving amorphous phases is a significant challenge, especially at the medium-range length scale. To overcome this challenge, here we first train a deep learning-based force field to identify the structural characteristics of both crystalline and non-crystalline ZIF phases. This allows us to reproduce the structural evolution trend during the melting of crystals and formation of ZIF glasses at various length scales with an accuracy comparable to that of ab initio molecular dynamics, yet at a much lower computational cost. Based on this approach, we propose a new structural descriptor, namely, the ring orientation index, to capture the propensity for crystallization of ZIF-4(Zn（Im）2, Im = C3H3N2-) glasses, as well as for the formation of ZIF-zni(Zn（Im）2) out of the high-density amorphous phase. This crystal formation process is a result of the reorientation of imidazole rings by sacrificing the order of the structure around the zinc-centered tetrahedra. The outcomes of this work are useful for studying phase transitions in other metal-organic frameworks（MOFs） and may thus guide the development of MOF glasses.

关键词： metal-organic frameworks phase transitions melting glass formation transferable deep learning force field ring orientation

The Nano Research Young Innovators Awards in bio-inspired nanomaterials

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Nano Research 2024年第2期17卷 417-425页

作者： Jun Chen Shuotao Wang department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nano Research Young Innovators(NR45)Awards are designed to acknowledge and celebrate the achievements of young researchers under 45 years of *** individuals have made significant contributions to the field of nanoscience and *** the inaugural NR45 Awards in 2018,the journal's editorial board has recognized over a hundred innovators specializing in nanobiotechnology,nano energy,two-dimensional materials,and *** focus of the 2023 NR45 Awards is on bioinspired nanomaterials,acknowledging thirty-three outstanding young innovators for their extraordinary contributions in developing these materials with applications spanning clean energy,human healthcare,monitoring,and disease treatments,as shown in *** extend our heartfelt congratulations to all the 33 NR45 Awardees in 2023!

关键词： journal materials contributions

Ranking academic institutions based on the productivity,impact,and quality of institutional scholars

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Journal of Data and Information Science 2024年第3期9卷 116-154页

作者： Amir Faghri Theodore L.Bergman department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesLos AngelesCA 90095USA department of Mechanical Engineering University of KansasLawrenceKS 66045USA

Purpose:The quantitative rankings of over 55,000 institutions and their institutional programs are based on the individual rankings of approximately 30 million scholars determined by their productivity,impact,and ***/methodology/approach:The institutional ranking process developed here considers all institutions in all countries and regions,thereby including those that are established,as well as those that are emerging in scholarly *** of individual scholars worldwide are first generated using the recently introduced,fully indexed ScholarGPS *** rankings of individual scholars are extended here to determine the lifetime and last-five-year Top 20 rankings of academic institutions over all Fields of scholarly endeavor,in 14 individual Fields,in 177 Disciplines,and in approximately 350,000 unique *** associated with five specific Fields(Medicine,Engineering&Computer Science,Life Sciences,Physical Sciences&Mathematics,and Social Sciences),and in two Disciplines(chemistry,and Electrical&Computer Engineering)are presented as examples,and changes in the rankings over time are ***:For the Fields considered here,the Top 20 institutional rankings in Medicine have undergone the least change(lifetime versus last five years),while the rankings in Engineering&Computer Science have exhibited significant *** evolution of institutional rankings over time is largely attributed to the recent emergence of Chinese academic institutions,although this emergence is shown to be highly Field-and *** implementations:Existing rankings of academic institutions have:(i)often been restricted to pre-selected institutions,clouding the potential discovery of scholarly activity in emerging institutions and countries;(ii)considered only broad areas of research,limiting the ability of university leadership to act on the assessments in a concrete manner,or in contrast;(iii)have considered only a narrow are

关键词： Academic institution ranking Top institutional scholars ScholarGPS

Precision chemistry for Two-Dimensional Materials

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Precision chemistry 2024年第8期2卷 376-379页

作者： Xiangfeng Duan department of chemistry and biochemistry and california NanoSystems Institute University of California Los Angeles California 90095 United States

Two-dimensional(2D)materials have garnered enormous interest as a novel platform for exploring fundamental chemistry and physics at the single-atom thickness *** materials encompass various categories and types,including graphene,1 hexagonal boron nitride(hBN),2 transition metal dichalcogenides(TMDs),3 MXenes,4 graphdiyne,5 covalent organic frameworks(COFs),6 and monolayer molecular crystals.

关键词： hexagonal boron monolayer