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Engineering the axial coordination of cobalt single atom catalysts for efficient photocatalytic hydrogen evolution

Nano Research 2024年第6期17卷 5114-5121页

作者： Ning Kang Lingwen Liao Xue Zhang Zhen He Binlu Yu Jiahong Wang Yongquan Qu Paul KChu seeram ramakrishn. Xue-Feng Yu Xin Wang Licheng Bai Materials Interfaces Center Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences(CAS)Shenzhen 518055China Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Department of Chemistry City University of Hong KongKowloonHong Kong 999077China Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongKowloonHong Kong 999077China Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics and Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China National University of Singapore(NUS)Centre for Nanofibers and Nanotechnology Department of Mechanical EngineeringNational University of SingaporeSingapore 117542Singapore

Improving the catalytic activity of non-noble metal single atom catalysts(SACs)has attracted considerable attention in materials *** optimizing the local electronic structure of single atom can greatly improve their catalytic activity,it often involves in-plane modulation and requires high ***,we report a novel strategy to manipulate the local electronic structure of SACs via the modulation of axial Co-S bond anchored onto graphitic carbon nitride(C_(3)N_(4))at room temperature(RT).Each Co atom is bonded to four N atoms and one S atom(Co-(N,S)/C_(3)N_(4)).Owing to the greater electronegativity of S in the Co-S bond,the local electronic structure of the Co atoms is available to be controlled at a relatively moderate ***,when employed for the photocatalytic hydrogen evolution reaction,the adsorption energy of intermediate hydrogen(H*)on the Co atoms is remarkably *** the presence of the Co-(N,S)/C_(3)N_(4)SACs,the hydrogen evolution rates reach up to 10 mmol/(g·h),which is nearly 10 and 2.5 times greater than the rates in the presence of previously reported transition metal/C_(3)N_(4)and noble platinum nanoparticles(PtNPs)/C_(3)N_(4)catalysts,*** to the tailorable axial Co-S bond in the SAC,the local electronic structure of the Co atoms can be further optimized for other photocatalytic *** axial coordination engineering strategy is universal in catalyst designing and can be used for a variety of photocatalytic applications.

关键词： transition metal single-atom local electronic structure photocatalytic hydrogen evolution graphitic carbon nitride axial coordination environment

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Electronic properties of 2D materials and their junctions

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Nano Materials Science 2024年第1期6卷 1-23页

作者： Taposhree Dutta Neha Yadav Yongling Wu Gary J.Cheng Xiu Liang seeram ramakrishn. Aoussaj Sbai Rajeev Gupta Aniruddha Mondal Zheng Hongyu Ashish Yadav Department of Chemistry Indian Institute of Engineering Science and TechnologyShibpurWest Bengal711103India Center for Advanced Laser Manufacturing(CALM) Shandong University of TechnologyZibo255000PR China School of Industrial Engineering Purdue University315 N.Grant St.West LafayetteIN47907United States Birck Nanotechnology Center Purdue University1205 W State St.West LafayetteIN47907United States Advanced Materials Institute Qilu University of TechnologyShandong Academy of SciencesJinan250014PR China Nanoscience and Nanotechnology Initiative National University of Singapore10 Kent Ridge Crescent119260Singapore Faculty of Applied Phsyics and Mathematics Gdansk University of Technology Narutowicza 11/1280233GdanskPoland Department of Physics School of EngineeringUniversity of Petroleum&Energy StudiesDehradun248007UttarakhandIndia Department of Physics National Institute of Technology DurgapurDurgapur713209West BengalIndia

With an extensive range of distinctive features at nano meter-scale thicknesses,two-dimensional(2D)materials drawn the attention of the scientific *** tremendous advancements in exploratory research on 2D materials,knowledge of 2D electrical transport and carrier dynamics still in its ***,here we highlighted the electrical characteristics of 2D materials with electronic band structure,electronic transport,dielectric constant,carriers *** atomic thinness of 2D materials makes substantially scaled field-effect transistors(FETs)with reduced short-channel effects conceivable,even though strong carrier mobility required for high performance,low-voltage device *** also discussed here about factors affecting 2D materials which easily enhanced the activity of those materials for various ***,Those 2D materials used in state-of-the-art electrical and optoelectronic devices because of the extensive nature of their electronic band structure.2D materials offer unprecedented freedom for the design of novel p-n junction device topologies in contrast to conventional bulk *** also,describe the numerous 2D p-n junctions,such as homo junction and hetero junction including mixed dimensional ***,we talked about the problems and potential for the future.

关键词： 2D materials Electrical properties p-n junctions Mixed hereto junctions Homo junctions Electrical transport

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A framework for the sustainability implications of 3D bioprinting through nature-inspired materials and structures

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Bio-Design and Manufacturing 2022年第2期5卷 412-423页

作者： Ruban Whenish seeram ramakrishn. Amit Kumar Jaiswal Geetha Manivasagam Center for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVelloreTamilnadu 632014India Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1119260Singapore

Introduction The climax of the industrial revolution was marked by the rapid growth of industry,and advancement in technologies have further fueled this industrial expansion,leading to a surge in economic *** technolo... 详细信息

关键词： printing advancement revolution

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A state-of-the-art review of the fabrication and characteristics of titanium and its alloys for biomedical applications

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Bio-Design and Manufacturing 2022年第2期5卷 371-395页

作者： Masoud Sarraf Erfan Rezvani Ghomi Saeid Alipour seeram ramakrishn. Nazatul Liana Sukiman Centre of Advanced Materials Department of Mechanical EngineeringFaculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Department of Materials Science and Engineering Sharif University of TechnologyAzadi Ave.P.O.Box 11365‑9466TehranIran Center for Nanotechnology and Sustainability Department of Mechanical EngineeringNational University of SingaporeSingapore 117581Singapore

Commercially pure titanium and titanium alloys have been among the most commonly used materials for biomedical applications since the 1950 *** to the excellent mechanical tribological properties,corrosion resistance,biocompatibility,and antibacterial properties of titanium,it is getting much attention as a biomaterial for ***,titanium promotes osseointegration without any additional adhesives by physically bonding with the living bone at the implant *** properties are crucial for producing high-strength metallic alloys for biomedical *** alloys are manufactured into the three types ofα,β,andα+β.The scientific and clinical understanding of titanium and its potential applications,especially in the biomedical field,are still in the early *** review aims to establish a credible platform for the current and future roles of titanium in *** first explore the developmental history of ***,we review the recent advancement of the utility of titanium in diverse biomedical areas,its functional properties,mechanisms of biocompatibility,host tissue responses,and various relevant antimicrobial *** research will be directed toward advanced manufacturing technologies,such as powder-based additive manufacturing,electron beam melting and laser melting deposition,as well as analyzing the effects of alloying elements on the biocompatibility,corrosion resistance,and mechanical properties of ***,the role of titania nanotubes in regenerative medicine and nanomedicine applications,such as localized drug delivery system,immunomodulatory agents,antibacterial agents,and hemocompatibility,is investigated,and the paper concludes with the future outlook of titanium alloys as biomaterials.

关键词： Titanium and titanium alloys Biomedical application Functional properties Biocompatibility Antibacterial activity Advanced manufacturing

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Recent insights on iron based nanostructured electrocatalyst and current status of proton exchange membrane fuel cell for sustainable transport

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Journal of Energy Chemistry 2022年第6期31卷 466-489,I0013页

作者： Mohamedazeem M.Mohideen Adiyodi Veettil Radhamani seeram ramakrishn. Yen Wei Yong Liu Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Department of Physics and Nanotechnology SRM Institute of Science and TechnologyKattankulathur 603203India Center for Nanofibers and Nanotechnology National University of SingaporeSingapore 1157Singapore Department of Chemistry Key Lab of Bioorganic Phosphorus Chemistry&Chemical BiologyTsinghua UniversityBeijing 100084China

Bridging the performance gap of the electrocatalyst between the rotating disk electrode(RDE) and membrane electrode assembly(MEA) level testing is the key to reducing the total cost of proton exchange membrane fuel cell(PEMFC) vehicles. Presently, platinum metal accounts for ~42% of the total cost of the PEMFC vehicles for usage in the cathode catalyst layer, where the sluggish oxygen reduction reaction(ORR) occurs. An alternative to the platinum catalyst, the Fe-N-C catalyst has attracted considerable interest for PEMFC due to its cost-effectiveness and high catalytic activity towards ORR. However, the excellent ORR activity of Fe-N-C obtained from RDE studies rarely translates the same performance into MEA operating conditions. Such a performance gap is mainly attributed to the lack of atomic-level understanding of Fe-N-C active sites and their ORR mechanism. Besides, unless the cost of expensive electrocatalyst is reduced, the total operation cost of the PEMFC vehicles remains constant. Therefore,developing highly efficient Fe-N-C catalysts from academic and industrial perspectives is critical for commercializing PEMFC vehicles. Here, the scope of the review is three-fold. First, we discussed the atomiclevel insights of Fe-N-C active sites and ORR mechanism, followed by unraveling the different iron-based nanostructured ORR electrocatalysts, including oxide, carbide, nitride, phosphide, sulfide, and singleatom catalysts. And then we bridged their ORR catalytic performance gap between the RDE and MEA tests for real operating conditions of PEMFC vehicles. Second, we focused on bridging the cost barriers of PEMFC vehicles between capital, operation, and end-user. Finally, we provided the path to achieve sustainable development goals by commercializing PEMFC vehicles for a better world.

关键词： Proton exchange membrane fuel cell(PEMFC) Active sites Iron-based nanostructure Sustainable development goals

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Advanced Electrospun Nanofibrous Materials for Efficient Oil/Water Separation

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Advanced Fiber Materials 2022年第5期4卷 938-958页

作者： Ying Su Tingting Fan Wenying Cui Yanan Li seeram ramakrishn. Yunze Long Collaborative Innovation Center for Nanomaterials&Devices College of PhysicsQingdao UniversityQingdao 266071China Industrial Research Institute of Nonwovens&Technical Textiles College of Textiles&ClothingShandong Center for Engineered NonwovensQingdao UniversityQingdao 266071China Department of Mechanical Engineering Center for Nanofibers&NanotechnologyNational University of SingaporeSingapore 117574Singapore

The frequent occurrence of crude oil leakage accidents and the massive discharge of industrial oily wastewater not only caused huge damage and pollution to the ecosystem but also wasted a lot of precious ***,it is urgent to solve the worldwide problem of oil/water *** a leader in advanced fiber materials,nanofibrous materials prepared by electrospinning have the advantages of high permeability,high separation efficiency,large specific surface area,adjustable wettability,simple preparation process,and low cost,making it attracted more attention of researchers in oil/water *** article mainly reviews the recent progress of various electrospun nanofibrous materials for oil/water separation *** preparation and synthesis of nanofibrous adsorbents,nanofibrous membranes,and nanofibrous aerogels in recent years based on different applications,design principles,and separation approaches are systematically ***,this review discusses the challenges and future development directions in oil/water separation.

关键词： Oil/water separation Electrospinning Nanofibrous adsorbents Membranes Aerogels

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Bioinspired mineral MXene hydrogels for tensile strain sensing and radionuclide adsorption applications

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Frontiers of physics 2022年第6期17卷 115-123页

作者： Xin Li Guangcun Shan Ruguang Ma Chan-Hung Shek Hongbin Zhao seeram ramakrishn. School of Instrumentation Science and Opto-electronics Engineering Beihang UniversityBeijing 100191China Department of Materials Science and Engineering City University of Hong KongKowloon TongHong Kong SARChina State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous MetalsBeijing 100088China Institute of Materials Science and Devices Suzhou University of Science and TechnologySuzhou 215009China Department of Mechanical Engineering&Circular Economy Taskforce National University of SingaporeSingapore 119077Singapore

MXene-based hydrogels have drawn considerable attention as flexible and wearable ***,the application of MXene-based hydrogels after sensing failure has rarely been investigated,which is of great significance for expanding their engineering *** this work,multifunctional mineral MXene hydrogels(MMHs)were synthesized via a simple method inspired by *** prepared MMHs were stretchable,self-healable and conductive,and can be used to fabricate wearable tensile strain sensors showing a super-wide sensing range with excellent ***-based strain sensors were designed to be directly attached to the skin surface to detect tiny and large human *** addition,with the advantages of a large specific area,excellent hydrophilicity and abundant active adsorption sites for MXene nanosheets and hydrogels,dehydrated MMHs were used as highly efficient adsorbents for the removal of strontium ions from aqueous *** work shows the great potential of MXene in promoting the development of nextgeneration functional materials.

关键词： MXene hydrogel flexible sensor adsorption

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Additive manufacturing of biodegradable magnesium-based materials:Design strategies,properties,and biomedical applications

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Journal of Magnesium and Alloys 2023年第3期11卷 801-839页

作者： Farzad Badkoobeh Hossein Mostaan Mahdi Rafiei Hamid Reza Bakhsheshi-Rad seeram Rama Krishna Xiongbiao Chen School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranTehranIran Faculty of Engineering Department of Materials and Metallurgical EngineeringArak UniversityArakIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Mechanical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada

Magnesium(Mg)-based materials are a new generation of alloys with the exclusive ability to be biodegradable within the human/animal *** addition to biodegradability,their inherent biocompatibility and similar-to-bone density make Mg-based alloys good candidates for fabricating surgical bioimplants for use in orthopedic and traumatology *** this end,nowadays additive manufacturing(AM)along with three-dimensional(3D)printing represents a promising manufacturing technique as it allows for the integration of bioimplant design and manufacturing processes specific to given ***,this technique also faces many new challenges associated with the properties of Mg-based alloys,including high chemical reactivity,potential for combustion,and low vaporization *** this review article,various AM processes to fabricate biomedical implants from Mg-based alloys,along with their metallic microstructure,mechanical properties,biodegradability,biocompatibility,and antibacterial properties,as well as various post-AM treatments were critically ***,the challenges and issues involved in AM processes from the perspectives of bioimplant design,properties,and applications were identified;the possibilities and potential scope of the Mg-based scaffolds/implants are discussed and highlighted.

关键词： Magnesium alloy Additive manufacturing 3D Printing Bone tissue engineering Scaffold Mechanical and biological properties

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Single crystal-single crystal bonding of langasite exhibited high strength of 23.28 MPa

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Journal of Materials Science & Technology 2023年第29期160卷 139-147页

作者： Guangyao Pei Binghe Ma Tao Ye Zhonggang Zhang Keli Zhao Jinjun Deng seeram ramakrishn. Jian Luo Ministry of Education Key Laboratory of Micro/Nano Systems for Aerospace Northwestern Polytechnical UniversityXi’an 710072China Centre for Nanofibers and Nanotechnology National University of Singapore117576Singapore

Langasite(LGS,La_(3)Ga_(5)SiO_(14))is a promising material in high-temperature piezoelectric devices due to its excellent thermal stability,piezoelectricity,and electrical property.A major challenge in the development of LGS-based devices is to form high-strength bonding of the brittle ***,we report that the single crystal-single crystal(dual-SC)bonding of LGS is realized through thermal activation under a low com-pression of 50 kPa for the first time.A record bonding strength of 23.28 MPa is achieved within the dual-SC bonded LGS/LGS structure(with a high bonding ratio exceeding 93%),which is 5 times higher than that of the recent reported LGS/LGS bonding structure(in which a relatively fragile amorphous interface layer is formed between the two LGS samples).The smooth and void-free dual-SC bonding interface of LGS is verified via the cross-sectional transmission electron microscopy(TEM)observations.

关键词： Thermal activation Single crystal-single crystal bonding Langasite High-strength Low compression

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Recent advances in MXenes-based glucose biosensors

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中国化学快报:英文版 2023年第10期34卷 2-11页

作者： Shunyao Tian Meng Wang Paolo Fornasiero Xiaoyu Yang seeram ramakrishn. Shih-Hsin Ho Fanghua Li State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Department of Chemical and Pharmaceutical Sciences University of TriesteVia L.Giorgieri 1Trieste 34127Italy Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali(INSTM) Unit of Triestevia L.Giorgieri 1Trieste 34127Italy School of Chemical and Environmental Engineering China University of Mining and TechnologyBeijing 100083China Center for Nanotechnology and Sustainability Department of Mechanical EngineeringNational University of SingaporeSingapore 119077Singapore

It is established that monitoring blood glucose on a daily basis is one of the most effective solutions to prevent and treat ***,developing a glucose sensing platform with outstanding sensing performance occupies an indispensable position for the early diagnosis and risk assessment of ***,biosensor has been deemed as a promising apparatus to acquire the signals for glucose monitoring based on 2D ***,it is unsatisfied to deploy some materials widely as a result of some inherent *** nanotubes have comparatively high ***_(2) with unfavourable biocompatibility are still arduously implemented on being ***,MXene,a brand-new and rapidly developing two-dimensional material,exhibits marvellous application potential in the domain of ***,it has exerted tremendous attention from diverse scientific fields owning to its remarkable properties,such as excellent hydrophilicity,metal-like conductivity,abundant surface functional groups,unique layered structure,large specific surface area and remarkable *** review mainly focuses on the main synthetic route of MXenes,as well as the recent advancements of biosensors involving MXenes as an electrode modifier for glucose *** addition,the promising prospects and challenges of glucose sensing technology based on MXenes are also discussed.

关键词： MXenes Biosensor Mechanism Blood glucose Glucose detection

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