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Synergistic integration of self-supported 1T/2H-wS_(2) and nitrogendoped rGO on carbon cloth for pH-universal electrocatalytic hydrogen evolution

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Nano Research 2024年第3期17卷 1267-1280页

作者： Feng Ming Yap Jian Yiing Loh wee-Jun ong School of Energy and chemical Engineering Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia center of Excellence for NaNo Energy&catalysis Technology(cONNEcT) Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia State Key Laboratory of Physical chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Gulei Innovation Institute Xiamen UniversityZhangzhou 363200China Shenzhen Research Institute of Xiamen University Shenzhen 518057China

Hydrogen economy based on electrochemical water splitting exemplified one of the most promising means for overcoming the rapid consumption of fossil fuels and the serious deterioration of global *** development of earth-abundant,efficient,and durable electrocatalysts for hydrogen evolution reaction(HER)plays a vital role in the commercialization of water ***,the self-supported electrode with unique nitrogen-doped reduced graphene oxide(N-rGO)nanoflakes and wS_(2) hierarchical nanoflower that were grown directly on carbon cloth(cc)substrate(wS_(2)/N-rGO/cc)was successfully synthesized using a facile dual-step hydrothermal *** as-synthesized 50%1T/2H-wS_(2)/N-rGO/cc(wGc),which possessed high metallic 1T phase of 57%not only efficiently exposed more active sites and accelerated mass/charge diffusion,but also endowed excellent structural lustiness,robust stability,and durability at a high current *** a result,the 50%wGc exhibited lower overpotentials and Tafel slopes of 21.13 mV(29.55 mV∙dec^(-1))and 80.35 mV(137.02 mV∙dec^(-1))as compared to 20%Pt-c/cc,respectively for catalyzing acidic and alkaline hydrogen evolution ***,the as-synthesized 50%wGc also depicted long-term stability for more than 8 h in the high-current-density regions(100 and 220 mA∙cm^(-2)).In brief,this work reveals a self-supported electrode as an extraordinary alternative to Pt-based catalysts for HER in a wide pH range,while paving a facile strategy to develop advanced electrocatalysts with abundant heterointerfaces for practical applications in energy-saving hydrogen production.

关键词： self-supported electrocatalyst carbon-based substrate phase engineering pH-universal water splitting

Enhancing MXene-based supercapacitors:Role of synthesis and 3D architectures

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Journal of Energy chemistry 2024年第4期91卷 1-26页

作者： wen Siong Poh wen Jie Yiang wee-Jun ong Pau Loke Show chuan Yi Foo School of Energy and chemical Engineering Xiamen University MalaysiaSelangor Darul EhsanMalaysia&College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Kelip-kelip!center of Excellence for Light Enabling Technologies Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia center of Excellence for NaNo Energy&catalysis Technology(cONNEcT) Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Department of chemical Engineering Khalifa UniversityShakhbout Bin Sultan St-Zone 1Abu DhabiUnited Arab Emirates Zhejiang Provincial Key Laboratory for Subtropical water Environment and Marine Biological Resources Protection Wenzhou UniversityWenzhou 325035ZhejiangChina Department of chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham MalaysiaJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia Department of Sustainable Engineering Saveetha School of EngineeringSIMATSChennai 602105India

MXene has been the limelight for studies on electrode active materials,aiming at developing supercapacitors with boosted energy density to meet the emerging influx of wearable and portable electronic *** its various desirable properties including intrinsic flexibility,high specific surface area,excellent metallic conductivity and unique abundance of surface functionalities,its full potential for electrochemical performance is hindered by the notorious restacking phenomenon of MXene *** to its two-dimensional(2D)nature and surface functional groups,inevitable Van der waals interactions drive the agglomeration of nanosheets,ultimately reducing the exposure of electrochemically active sites to the electrolyte,as well as severely lengthening electrolyte ion transport *** a result,energy and power density deteriorate,limiting the application versatility of MXene-based *** 3D architectures using 2D nanosheets presents as a straightforward yet ingenious approach to mitigate the fatal flaws of ***,the sheer number of distinct methodologies reported,thus far,calls for a systematic review that unravels the rationale behind such 3D MXene structural ***,this review aims to serve this purpose while also scrutinizing the structure–property relationship to correlate such structural modifications to their ensuing electrochemical performance ***,the physicochemical properties of MXene play fundamental roles in determining the effective charge storage capabilities of 3D MXene-based *** largely depends on different MXene synthesis techniques and synthesis condition variations,hence,elucidated in this review as ***,the challenges and perspectives for achieving viable commercialization of MXene-based supercapacitor electrodes are highlighted.

关键词： MXene 3D architectures Synthesis design Supercapacitor Energy storage

Synergistic redox reactions toward co-production of H_(2)O_(2)and value-added chemicals:Dual-functional photocatalysis to achieving sustainability

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SusMat 2024年第3期4卷 36-72页

作者： Brenden Jing Su Joel Jie Foo Grayson Zhi Sheng Ling wee-Jun ong School of Energy and chemical Engineering Xiamen University MalaysiaSelangor Darul EhsanMalaysia center of Excellence for NaNo Energy&catalysis Technology Xiamen University MalaysiaSelangor Darul EhsanMalaysia State Key Laboratory of Physical chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina Gulei Innovation Institute Xiamen UniversityZhangzhouChina Shenzhen Research Institute Xiamen UniversityShenzhenChina

IntegratingH_(2)O_(2)evolution with oxidative organic synthesis in a semiconductordriven photoredox reaction is highly attractive since H_(2)O_(2)and high-value chemicals can be concurrently produced using solar light as the only energy *** dual-functional photocatalytic approach,free from sacrificial agents,enables simultaneous production of H_(2)O_(2)and high-value organic *** strategy promises a green and sustainable organic synthesis with minimal greenhouse gas *** this review,we first elucidate the fundamental principles of cooperative photoredox integration of H_(2)O_(2)synthesis and selective organic oxidation with simultaneous utilization of photoexcited electrons and holes over semiconductor-based ***,a thorough review on the recent advancements of cooperative photoredox synthesis of H_(2)O_(2)and value-added chemicals is ***,in-depth discussions and insights into the techniques for unravelling the photoredox reaction mechanisms are ***,critical challenges and prospects in this thriving field are comprehensively *** is envisioned that this review will serve as a pivotal guidance on the rational design of such dual-functional photocatalytic system,thereby further stimulating the development of economical and environmentally benignH_(2)O_(2)and high-value chemicals production.

关键词： cooperative photoredox synthesis dual-functional photocatalysts H_(2)O_(2) photocatalysis selective organic oxidation

Allying interfacial engineering of 2D carbon nanosheet-,graphene-,and graphdiyne-based heterostructured electrocatalysts toward hydrogen evolution and overall water splitting

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Electron 2024年第1期2卷 106-163页

作者： wuwei Mo Joel Jie Foo wee‐Jun ong School of Energy and chemical Engineering Xiamen University MalaysiaSepangSelangor Darul EhsanMalaysia center of Excellence for NaNo Energy&catalysis Technology(cONNEcT) Xiamen University MalaysiaSepangSelangor Darul EhsanMalaysia State Key Laboratory of Physical chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina Gulei Innovation Institute Xiamen UniversityZhangzhouChina Shenzhen Research Institute of Xiamen University ShenzhenChina

Electrochemical hydrogen evolution reaction(HER)and overall water splitting(OwS)for renewable energy generation have recently become a highly promising and sustainable strategy to tackle energy crisis and global warming arising from our overreliance on fossil ***,tremendous research breakthroughs have been made in 2D carbon-based heterostructured electrocatalysts in this *** heterostructures are distinguished by their remarkable electrical conductivity,exposed active sites,and mechanical ***,with fundamental mechanisms of electrocatalytic OwS summarized,our review critically emphasized on state-of-the-art 2D carbon nanosheet-,graphene-,and graphdiyne-based heterostructured electrocatalysts in HER and OwS since ***,the three emerging carbonaceous substrates tend to be incorporated with metal carbides,phosphides,dichalcogenides,nitrides,oxides,nanoparticles,single atom catalysts,or layered double ***,fascinating structural engineering and facile synthesis strategies were also unraveled to establish the structure-activity relationship,which will enlighten future electrocatalyst developments toward ameliorated HER and OwS ***,computational results from density functional theory simulations were highlighted as well to better comprehend the synergistic effects within the ***,current stages and future recommendations of this brand-new electrocatalyst type were concluded and discussed for advanced catalyst designs and future practical applications.

关键词： 2D carbon-based heterostructures electrocatalysis hydrogen evolution reaction interfacial engineering overall water splitting

Biodiversity Assessment of Avifauna in the Forest Reservation of Aurora State college of Technology (AScOT), Philippines

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Open Journal of Ecology 2024年第4期14卷 292-308页

作者： Afed S. Daiwey Heherson B. ong Emerson V. Barcellano Edmundo c. Gumpal Michelle Ann M. calubaquib Rafael J. Padre School of Forestry and Environmental Sciences Aurora State College of Technology Baler Philippines college of Forestry and Environmental Science Isabela State University Cabagan Philippines college of Agriculture Isabela State University Cabagan Philippines college of Engineering Isabela State University Echague Philippines

The research study was conducted to assess and quantify the current status of avifauna biodiversity assets of Aurora State college of Technology’s Forest Reservation in Baler, Aurora, Philippines. Assessment of avifaunal diversity was undertaken by traversing the four established circular plots having a radius of 125 meters or 250 meters diameters each as permanent monitoring stations. Study revealed a total number of 151 Individual species, classified into 23 genera and 21 families. Eighteen of these species are endemic while the remaining five were fully migrated birds. All birds observed were classified as Least concern (Lc) species according to the International Union for conservation of Nature’s Red List of Threatened Species and the updated list of the Birds of the world online. Its abundance, richness and diversity index were calculated using Shannon Diversity Index (H') while Pielou’s evenness (J') for distribution of species. Forest reservation of AScOT has more even (0.756 J') and moderate diversity (2.812 H') observation on avifauna in general. However, this avian population evaluation was threatened into a verge of extinction due to natural and anthropological threats that causes forest deforestation. Such deforestation of habitat causes dwindling of wildlife territory leading to the scarcity of bird’s population. Thus, the assessment was conducted to aid AScOT administration find significant plans to ensure sustainable conservation and protection of the remaining avifauna species in the reservation area.

关键词： Biodiversity Avifauna Abundance Species Richness Species Diversity

AR-assisted robot welding programming

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Advances in Manufacturing 2020年第1期8卷 40-48页

作者： S.K.ong A.Y.c.Nee A.w.w.Yew N.K.Thanigaivel Department of Mechanical Engineering Faculty of EngineeringNational University of SingaporeSingapore

Robotic welding demands high accuracy and ***,robot programming is often a tedious and time-consuming process that requires expert *** paper presents an augmented reality assisted robot welding task programming(ARwP)system using a user-friendly augmented reality(AR)interface that simplifies and speeds up the programming of robotic welding *** ARwP system makes the programming of robot welding tasks more user-friendly and reduces the need for trained programmers and expertise in specific robotic *** AR interface simplifies the definition of a welding path as well as the welding gun orientation,and the system;the system can locate the welding seam of a workpiece quickly and generate a viable welding path based on the user *** developed system is integrated with the touch-sensing capability of welding robots in order to locate the welding path accurately based on the user input,for fillet *** system is applicable to other welding processes and methods of seam *** system implementation is described and evaluated with a case study.

关键词： Augmented reality(AR) Robot programming welding Seam tracking

catalytically altering the redox pathway of sulfur in propylene carbonate electrolyte using dual-nitrogen/oxygen-containing carbon

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chinese Journal of catalysis 2024年第8期63卷 224-233页

作者： Linghui Yu Heng Zhang Luyuan Paul wang Samuel Jun Hoong ong Shibo Xi Bo chen Rui Guo Ting wang Yonghua Du wei chen Ovadia Lev Zhichuan J.Xu School of chemistry and chemical Engineering Wuhan Textile UniversityWuhan 430200HubeiChina School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Hubei Key Laboratory of Biomass Fibers&Eco-Dyeing&Finishing Wuhan Textile UniversityWuhan 430200HubeiChina Institute of Sustainability for chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research in Singapore(A*STAR)1 Pesek RoadJurong Island 627833Singapore Department of chemistry National University of SingaporeSingapore 117543Singapore college of the Environment&Ecology Xiamen UniversityXiamen 361102FujianChina National Synchrotron Light Source II Brookhaven National LaboratoryUptonNY 11973USA The Institute of chemistry The Hebrew University of JerusalemJerusalem 9190401Israel Singapore-HUJ Alliance for Research and Enterprise NEW-CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore138602Singapore Energy Research Institute@NTU ERI@NInterdisciplinary Graduate SchoolNanyang Technological UniversitySingapore 639798Singapore

carbonate electrolytes are one of the most desirable electrolytes for high-energy lithium-sulfur batteries(LSBs)because of their successful implementation in commercial Li-ion *** low-polysulfide-solubility feature of some carbonate solvents also makes them very promising for overcoming the shuttle effects of ***,regular sulfur electrodes experience undesired electrochemical mechanisms in carbonate electrolytes due to side *** this study,we report a catalytic redox mechanism of sulfur in propylene carbonate(Pc)electrolyte based on a compari-son *** catalytic mechanism is characterized by the interactions between polysulfides and dual N/O functional groups on the host carbon,which largely prevents side reactions between pol-ysulfides and the carbonate *** a mechanism coupled with the low-polysulfide-solubility feature leads to stable cycling of LSBs in Pc *** dual N/O functional groups are identified via a density functional theory *** work provides an alternative route for enabling LSBs in carbonate electrolytes.

关键词： Energy storage Lithium-sulfur battery catalytic redox reaction Porous carbon carbonate electrolyte

Mobile augmented reality visualization and collaboration techniques for on-site finite element structural analysis

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International Journal of Modeling, Simulation, and Scientific computing 2018年第3期9卷 2-21页

作者： w.K.Li A.Y.c.Nee S.K.ong NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 28 Medical Drive Singapore 117456Singapore Mechanical Engineering Department National University of Singapore 9 Engineering Drive 1 Singapore 117576Singapore∗mpeneeyc@nus.edu.sg

In this paper,a mobile augmented reality(AR)framework for on-site finite element analysis(FEA)is *** proposed framework is achieved using a client–server *** performance of FEA relies on several important components,namely,computational power,visualization technique,and numerical *** renders intuitive computer-generated contents directly on a user’s *** FEA with AR helps users through enhancing their perception and interaction with the engineering *** and effective visualization of these data using an AR platform can reduce the misinterpretation in spatial and logical *** the past decade,AR has undergone a transition from desktop to phablet *** platforms enable user exploration of FEA results in *** client side uses a hybrid method to visualize FEA results in the mobile AR *** addition,a user can collaborate with other users by using the result sharing function.A prototype with basic functions has been built and a case study has been implemented to demonstrate the visualization method and evaluate the overall performance.

关键词： Augmented reality scientific visualization on-site finite element analysis client-server.

Subordinacy theory for extended cMV matrices

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Science china Mathematics 2022年第3期65卷 539-558页

作者： Shuzheng Guo David Damanik Darren c.ong School of Mathematical Sciences Ocean University of ChinaQingdao 266100China Department of Mathematics Rice UniversityHoustonTX 77005USA Department of Mathematics Xiamen University MalaysiaSepangSelangor Darul Ehsan 43900Malaysia

we develop subordinacy theory for extended cantero-Moral-Velázquez(cMV) matrices,i.e.,we provide explicit supports for the singular and absolutely continuous parts of the canonical spectral measure associated with a given extended cMV matrix in terms of the presence or absence of subordinate solutions to the generalized eigenvalue *** corollaries and applications of this result are described as well.

关键词： spectral theory subordinacy theory cMV matrix unitary operator carathéodory function