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Hydrophilic bi-functional B-doped g-C_(3)N_(4) hierarchical architecture for excellent photocatalytic H_(2)O_(2) production and photoelectrochemical water splitting

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Journal of Energy Chemistry 2022年第7期31卷 236-247,I0007页

作者： Yang Ding Soumyajit Maitra Chunhua Wang Runtian Zheng Meiyu Zhang Tarek Barakat Subhasis Roy Jing Liu Yu Li tawfique hasan Bao-Lian Su Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de BruxellesB-5000 NamurBelgium Namur Institute of Structured Matter(NISM) University of Namur61 rue de BruxellesB-5000 NamurBelgium Department of Chemical Engineering University of Calcutta92 APC RoadWest BengalKolkata 700009India Department of Chemistry KU LeuvenCelestijnenlaan 200FB-3001 LeuvenBelgium State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000GansuChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Cambridge Graphene Centre University of CambridgeCambridgeCB30DSUK Clare Hall University of CambridgeUnited KingdomCB21EWUK

Graphitic carbon nitride(g-C_(3)N_(4))has attracted great interest in photocatalysis and ***,their poor hydrophilicity poses a great challenge for their applications in aqueous ***,we demonstrate synthesis of a hydrophilic bi-functional hierarchical architecture by the assembly of B-doped g-C_(3)N_(4)*** hierarchical B-doped g-C_(3)N_(4)material enables full utilization of their highly enhanced visible light absorption and photogenerated carrier separation in aqueous medium,leading to an excellent photocatalytic H_(2)O_(2)production rate of 4240.3μM g^(-1)h^(-1),2.84,2.64 and 2.13 times higher than that of the bulk g-C_(3)N_(4),g-C_(3)N_(4)nanoplatelets and bulk B doped g-C_(3)N_(4),*** based on these hierarchical architectures can generate an unprecedented photocurrent density of 1.72 m A cm^(-2)at 1.23 V under AM 1.5 G illumination for photoelectrochemical water *** work makes a fundamental improvement towards large-scale exploitation of highly active,hydrophilic and stable metal-free g-C_(3)N_(4)photocatalysts for various practical applications.

关键词： Boron doping Hydrophilicity Hierarchically assembled architectures Photocatalytic H_(2)O_(2)production Photoelectrocatalytic water splitting

Core processing neuron-enabled circuit motifs for neuromorphic computing

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InfoMat 2023年第11期5卷 78-88页

作者： Hanxi Li Jiayang Hu Anzhe Chen Yishu Zhang Chenhao Wang Beiduo Wang Yi Tong Jiachao Zhou Kian Ping Loh Yang Xu tawfique hasan Bin Yu School of Micro-Nano Electronics Zhejiang UniversityHangzhouthe People's Republic of China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhouthe People's Republic of China School of Materials Science and Engineering Zhejiang UniversityHangzhouthe People's Republic of China Department of Polymer Science and Engineering Zhejiang UniversityHangzhouthe People's Republic of China Gusu Laboratory of Materials Suzhouthe People's Republic of China Department of Chemistry National University of SingaporeSingaporeSingapore Joint Institute of Zhejiang University and the University of Illinois at Urbana-Champaign Zhejiang UniversityHainingthe People's Republic of China Cambridge Graphene Centre Cambridge University Engineering DepartmentCambridgeUK

Based on brain-inspired computing frameworks,neuromorphic systems implement large-scale neural networks in *** rapid advances have been made in the development of artificial neurons and synapses in recent years,further research is beyond these individual components and focuses on neuronal circuit motifs with specialized excitatory-inhibitory(E-I)connectivity *** this study,we demonstrate a core processor that can be used to construct commonly used neuronal *** neuron,featuring an ultracompact physical configuration,integrates a volatile threshold switch with a gate-modulated two-dimensional(2D)MoS_(2) field-effect channel to process complex E-I spatiotemporal spiking ***,basic neuronal circuits are constructed for biorealistic neuromorphic *** practical applications,an algorithm-hardware co-design is implemented in a gatecontrolled spiking neural network with substantial performance improvement in human speech separation.

关键词： artificial intelligence hardware excitatory-inhibitory neurons neuronal circuit motifs speech separation spiking neural networks

A Stable, Wideband Tunable, Near Transform-Limited, Graphene- Mode-Locked, Ultrafast Laser

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Nano Research 2010年第9期3卷 653-660页

作者： Zhipei Sun Daniel Popa tawfique hasan Felice Torrisi Fengqiu Wang Edmund J.R.Kelleher John C.Travers Valeria Nicolosi Andrea C.Ferrari Department of Engineering University of CambridgeCambridge CB30FAUK Physics Department Imperial CollegeLondon SW72AZUK Department of Materials University of OxfordOxford OX13PHUK

We report an ultrafast laser mode-locked with a graphene saturable *** linear dispersions of the Dirac electrons in graphene enable wideband *** get-1 ps pulses,tunable between 1525 and 1559 nm,with stable mode-lockin... 详细信息

关键词： Graphene saturable absorber mode-locking fiber laser

Bioinspired urchin-like murray carbon nanostructure with protection shell for advanced lithium-sulfur batteries

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Journal of Energy Chemistry 2023年第10期85卷 1-10,I0002页

作者： Ya-Wen Tian Yong Yu Liang Wu Min Yan Wen-Da Dong Chen-Yang Wang Hemdan S.H.Mohamed Zhao Deng Li-Hua Chen tawfique hasan Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina School of Automotive Engineering Xiangyang PolytechnicXiangyang 441050HubeiChina Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Hubei Engineering Technology Research Center of Optoelectronic and New Energy MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205HubeiChina Physics Department Faculty of ScienceFayoum UniversityEl Gomhoria Street63514 FayoumEgypt Cambridge Graphene Centre University of CambridgeCambridge CB30FAUnited Kingdom Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de BruxellesB-5000 NamurBelgium

Commercial application of lithium-sulfur(Li-S) batteries is hindered by the insulating nature of sulfur and the dissolution of polysulfides. Here, a bioinspired 3D urchin-like N-doped Murray's carbon nanostructure(N-MCN) with interconnected micro-meso-macroporous structure and a polydopamine protection shell has been designed as an effective sulfur host for high-performance Li-S batteries. The advanced 3D hierarchically porous framework with the characteristics of the generalized Murray's law largely improves electrolyte diffusion, facilitates electrons/ions transfer and provides strong chemisorption for active species, leading to the synergistic structural and chemical confinement of polysulfides. As a result,the obtained P@S/N-MCN electrode with high areal sulfur loading demonstrates high capacity at high current densities after long cycles. This work reveals that following the generalized Murray's law is feasible to design high-performance sulfur cathode materials for potentially practical Li-S battery applications.

关键词： Li-S batteries Murray’s law Hierarchically porous framework N-doped carbon Structural-chemical confinement

Interwoven scaffolded porous titanium oxide nanocubes/carbon nanotubes framework for high-performance sodium-ion battery

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Journal of Energy Chemistry 2021年第8期30卷 38-46,I0002页

作者： Wen-Bei Yu Wen-Da Dong Chao-Fan Li Nasiruddin Macadam Jiu-Xiang Yang Guo-Bin Zhang Zhi-Yi Hu Tien-Chun Wu Yu Li tawfique hasan Li-Hua Chen Li-Qiang Mai Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Cambridge Graphene Centre University of Cambridge9 JJ Thomson AvenueCB30FA CambridgeUnited Kingdom Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000 NamurBelgium

Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of *** dioxide(TiO_(2)),is a promising anode *** performance is however seriously hindered by its low electrical conductivity and the sluggish diffusion of sodium ions(Na^(+))in the TiO_(2)***,this work combines porous TiO_(2)nanocubes with carbon nanotubes(CNTs)to enhance the electrical conductivity and accelerate Na^(+)diffusivity for Na-ion batteries(NIBs).In this composite,an interwoven scaffolded TiO_(2)/CNTs framework is formed to provide abundant channels and shorter diffusion pathways for electrons and *** in-situ X-ray diffraction and cyclic voltammetry confirm the low strain and superior transport kinetics in Na^(+)intercalation/extraction *** addition,the chemically bonded TiO_(2)/CNTs hybrid provides a more feasible channel for Na^(+)insertion/extraction with a much lower energy ***,the TiO_(2)/CNTs composite exhibits excellent electrochemical performance with a capacity of 223.4 m Ah g^(-1)at 1 C and a capacity of 142.8 m Ah g^(-1)at 10 C(3.35 A g^(-1)).The work here reveals that the combination of active materials with CNTs can largely improve the utilization efficiency and enhance their sodium storage.

关键词： Supercapacitor-like Interwoven scaffold Na-ion battery TiO_(2) Carbon nanotubes

Solution processed MoS2-PVA composite for subbandgap mode-locking of a wideband tunable ultrafast Er：fiber laser

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Nano Research 2015年第5期8卷 1522-1534页

作者： Meng Zhang Richard C. T. Howe Robert I. Woodward Edmund J. R. Kelleher Felice Torrisi Guohua Hu Sergei V. Popov J. Roy Taylor tawfique hasan Femtosecond Optics Group Blackett Laboratory Prince Consort Road Imperial College London London SW7 2AZ UK Cambridge Graphene Centre University of Cambridge Cambridge CB3 OFA UK

We fabricate a free-standing few-layer molybdenum disulfide （MoS2）-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate a wideband tunable, ultrafast mode-locked fiber laser. Stable, picosecond pulses, tunable from 1,535 nm to 1,565 nm, are generated, corresponding to photon energies below the MoS2 material bandgap. These results contribute to the growing body of work studying the nonlinear optical properties of transition metal dichalcogenides that present new opportunities for ultrafast photonic applications.

关键词： molybdenum disulfide two-dimensional materials liquid phase exfoliation polymer composites saturable absorbers ultrafast lasers

Bioinspired Noncyclic Transfer Pathway Electron Donors for Unprecedented Hydrogen Production

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CCS Chemistry 2023年第6期5卷 1470-1482页

作者： Jing Liu Chao Wang Wenbei Yu Heng Zhao Zhi-Yi Hu Fu Liu tawfique hasan Yu Li Gustaaf Van Tendeloo Can Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 Wuhan Nanostructure Research Centre(NRC) Wuhan University of Technology430070 Wuhan School of Materials Science and Engineering Zhejiang University310027 Hangzhou Cambridge Graphene Centre University of CambridgeCambridge CB30FA EMAT(Electron Microscopy for Materials Science) University of AntwerpB-2020 Antwerp State Key Laboratory of Catalysis Dalian Institute of Chemical Physics116023 Dalian Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 Namur

Electron donors are widely exploited in visible-light photocatalytic hydrogen *** a typical electron donor pair and often the first choice for hydrogen production,the sodium sulfide-sodium sulfite pair has been extensively ***,the resultant thiosulfate ions consume the photogenerated electrons to form an undesirable pseudocyclic electron transfer pathway during the photocatalytic process,strongly limiting the solar energy conversion ***,we report novel and bioinspired electron donor pairs offering a noncyclic electron transfer pathway that provides more electrons without the consumption of the photogenerated *** to the state-of-the-art electron donor pair Na_(2)S-Na_(2)SO_(3),these novel Na_(2)S-NaH_(2)PO_(2)and Na_(2)S-NaNO_(2)electron donor pairs enable an unprecedented enhancement of up to 370%and 140%for average photocatalytic H_(2)production over commercial CdS nanoparticles,and they are versatile for a large series of photocatalysts for visible-light water *** discovery of these novel electron donor pairs can lead to a revolution in photocatalysis and is of great significance for industrial visible-light-driven H_(2)production.

关键词： noncyclic electron transfer Na_(2)SNaH_(2)PO_(2) Na_(2)S-NaNO_(2) electron donor pairs photocatalytic H_(2)production