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Bilayer separator enabling dendrite-free zinc anode with ultralong lifespan >5000 h

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Green Energy & Environment 2024年第4期9卷 771-776页

作者： Lu Wang Feifei Wang Zhe Ding Yingxin Liu Ziyi Zhang Chunpeng Yang kian ping loh Quan-Hong Yang Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou350207China Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China Department of Chemistry National University of Singapore117543Singapore Institute of Process Engineering Chinese Academy of SciencesBeijing100190China

Aqueous zinc(Zn)batteries with Zn metal anodes are promising clean energy storage devices with intrinsic safety and low cost.However,Zn dendrite growth severely restricts the use of Zn anodes.To effectively suppress Zn dendrite growth,we propose a bilayer separator consisting of commercial butter paper and glassfiber membrane.The dense cellulose-based butter paper(BP)with low zincophilicity and high mechanical properties prevents the pore-filling behavior of deposited Zn and related separator piercing,effectively suppressing the Zn dendrite growth.As a result,the bilayer separators endow the ZnjjZn symmetrical batteries with a superlong cycling life of Zn anodes(over 5000 h)at 0.5 mA cm^(-2) and the full batteries enhanced capacity retention,demonstrating the advancement of the bilayer separator to afford excellent cyclability of aqueous metal batteries.

关键词： Zn battery Bilayer separator Butter paper Zn metal anode Zn dendrite

Engineering Single Atom Catalysts for Flow Production:From Catalyst Design to Reactor Understandings

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Accounts of Materials Research 2023年第1期4卷 27-41页

作者： Zhongxin Chen Jia Liu kian ping loh Department of Chemistry National University of SingaporeSingapore 117543Singapore

CONSPECTUS:In heterogeneous catalysis,the long-standing challenge isto achieve extremely high activity and chemoselectivity in liquid-phaseorganic transformations comparable to that of homogeneous or enzymaticprocesses.Single-atom catalysts(SACs)with atomically precise coordinationare developed with the objectives to mimic the homogeneous pathwaysbut face stability issues due to metal leaching or clustering.Additionally,thepractical application of SACs in chemical production is hampered by thelack of standard preparation protocols and low conversion using laboratorybatch reactors.This Account focuses on our recent studies in both catalyst design andreactor-level engineering for the flow synthesis of fine chemicals via SACs.At the catalyst and reaction level,we will discuss the intrinsic mechanismthat controls reactivity and chemoselectivity in the SAC-catalyzed processand highlight examples where SACs outperform other catalytic approaches.Specifically,we reported the SAC-mediated preparationand late-stage functionalization of pharmaceutical drugs,including lonidamine,Tamiflu,cavosonstat,indomethacin,and many othersby chemoselective transformations in a sequential or multicomponent manner.The ability of ultrahigh loading SACs in providing amultisite pathway for organic transformations involving two or more reactants is highlighted and contrasted with the single-sitepathway in conventional SACs.Molecular-level understanding on the dynamic catalytic cycle obtained using operando X-rayabsorption spectroscopies provides guidance for the design of more effective and leach resistant SACs.This also calls for thetransformation of laboratory powder-based catalysts into industrially viable monolithic catalysts via formulation to further enhancethe leach resistance.At the reactor level,we will highlight the importance of continuous-flow techniques in maximizing productivityand simplifying process transfer from laboratory to commercial production.Particularly,we discuss the use of fuel cell-type flowstacks for quantitative pr

关键词： catalyst overcome kinetics

Chiral self-assembly of terminal alkyne and selenium clusters organic–inorganic hybrid

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Nano Research 2022年第3期15卷 2741-2745页

作者： Zhi Chen Tao Lin Haohan Li Mingzi Sun Chenliang Su Bolong Huang kian ping loh SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsCollege of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China Department of Chemistry Centre for Advanced 2D Materials(CA2DM)National University of Singapore3 Science Drive 3Singapore 117543Singapore College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina

The on-surface self-assembly of inorganic atomic clusters and organic molecules offers significant opportunities to design novel hybrid materials with tailored functionalities.By adopting the advantages from both inorganic and organic components,the hybrid self-assembly molecules have shown great potential in future optoelectrical devices.Herein,we report the co-deposition of 4,8-diethynylbenzo[1,2-d-4,5-d0]bisoxazole(DEBBA)and Se atoms to produce a motif-adjustable organic–inorganic hybrid self-assembly system via the non-covalent interactions.By controlling the coverage of Se atoms,various chiral molecular networks containing Se,Se_(6),Se_(8),and terminal alkynes evolved on the Ag(111)surface.In particular,with the highest coverage of Se atoms,phase segregation into alternating one-dimensional chains of non-covalently bonded Se_(8) clusters and organic ligands has been noticed.The atom-coverage dependent evolution of self-assembly structures reflects the remarkable structural adaptability of Se clusters as building blocks based on the spontaneous resize to reach the maximum non-covalent interactions.This work has significantly extended the possibilities of flexible control in self-assembly nanostructures to enable more potential functions for broad applications.

关键词： self-assembly inorganic–organic hybrid chiral Se cluster concentration-dependent

An old kid in the block: 2D polymeric C60

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Science China Materials 2023年第2期66卷 836-836页

作者： kian ping loh Department of Chemistry National University of Singapore

关键词： An old kid in the block polymeric C

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 hardware.Although 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 patterns.In this study,we demonstrate a core processor that can be used to construct commonly used neuronal circuits.The 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 signals.Consequently,basic neuronal circuits are constructed for biorealistic neuromorphic computing.For 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

Tuning photoresponse of graphene-black phosphorus heterostructure by electrostatic gating and photo-induced doping

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Chinese Chemical Letters 2022年第1期33卷 368-373页

作者： Yanpeng Liu Ming Yang Junpeng Lu Ying Liu Hongwei Liu Erwen Zhang Wei Fu Junyong Wang Zhenliang Hu Jun Yin Goki Eda Shijie Wang Jiabao Yi Ajayan Vinu kian ping loh Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina School of Physics Southeast UniversityNanjing 211189China College of Jincheng Nanjing University of Aeronautics and AstronauticsNanjing 211156China School of Physics and Technology Nanjing Normal UniversityNanjing 210023China Department of Chemistry National University of SingaporeSingapore 117543Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Innovis 138634Singapore Global Innovative Centre for Advanced Nanomaterials College of EngineeringScience and EnvironmentThe University of NewcastleNewcastle NSW 2308Australia

Metal-semiconductor diodes constructed from two-dimensional(2D)van der Waals heterostructures show excellent gate electrostatics and a large built-in electric field at the tunnel junction,which can be exploited to make highly sensitive photodetector.Here we demonstrate a metal-semiconductor photodiode constructed by the monolayer graphene(Gr)on a few-layer black phosphorus(BP).Due to the presence of a built-in potential barrier(~0.09±0.03 eV)at the Gr-BP interface,the photoresponsivity of the Gr-BP device is enhanced by a factor of 672%,and the external quantum efficiency(EQE)increases to648%from 84%of the bare BP.Electrostatic gating allows the BP channel to be switched between p-type and n-type conduction.We further demonstrate that excitation laser power can be used to control the current polarity of the Gr-BP device due to photon-induced doping.The versatility of the Gr-BP junctions in terms of electrostatic bias-induced or light-induced switching of current polarity is potentially useful for making dynamically reconfigurable digital circuits.

关键词： Black phosphorous Graphene Heterostructure Gate-tunable Photodetector Photoinverter

An old kid in the block:2D polymeric C_(60)

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Science China Materials 2023年第2期66卷 836-836页

作者： kian ping loh Department of Chemistry National University of SingaporeSingapore 117546Singapore

The discovery of graphene marks the beginning of vigorous development in the field of two-dimensional(2D)materials[1,2].Due to the excellent carrier transport mobility induced by the uniqueπ-electron conjugated structure,graphene has attracted extensive attention.With the development of 2D materials for 18 years,thousands of 2D materials have been successfully prepared.

关键词： graphene polymeric transport

From Micropores to Ultra-micropores inside Hard Carbon: Toward Enhanced Capacity in Room-/ Low-Temperature Sodium-Ion Storage

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Nano-Micro Letters 2021年第6期13卷 297-310页

作者： Jinlin Yang Xiaowei Wang Wenrui Dai Xu Lian Xinhang Cui Weichao Zhang Kexin Zhang Ming Lin Ruqiang Zou kian ping loh Quan-Hong Yang Wei Chen Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207People’s Republic of China Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore National University of Singapore(Suzhou)Research Institute 377 Lin Quan StreetSuzhou Industrial ParkSuzhou 215123JiangsuChina Department of Physics National University of Singapore2 Science Drive 3Singapore 117542Singapore Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350People’s Republic of China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871People’s Republic of China Institute of Materials Research and Engineering(IMRE) Agency of ScienceTechnologyand Research(A*STAR)3 Research LinkSingapore 117602Singapore

Pore structure of hard carbon has a fundamental influence on the electrochemical properties in sodium-ion batteries(SIBs).Ultra-micropores(1 nm)inside carbon into ultra-micropores(<0.5 nm).Consequently,the designed carbon anode displays an enhanced capacity of 346 mAh g^(−1) at 30 mA g^(−1) with a high ICE value of~80.6%and most of the capacity(~90%)is below 1 V.Moreover,the high-loading electrode(~19 mg cm^(−2))exhibits a good temperature endurance with a high areal capacity of 6.14 mAh cm^(−2) at 25℃ and 5.32 mAh cm^(−2) at −20℃.Based on the in situ X-ray diffraction and ex situ solid-state nuclear magnetic resonance results,the designed ultra-micropores provide the extra Na+storage sites,which mainly contributes to the enhanced capacity.This proposed strategy shows a good potential for the development of high-performance SIBs.

关键词： Carbon anode Ultra-micropores Extra sodium-ion storage sites Low-voltage capacity High areal capacity

Wrinkle-free graphene with spatially uniform electrical properties grown on hot-pressed copper

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Nano Research 2015年第4期8卷 1075-1080页

作者： Jeong Hun Mun Joong Gun Oh Jae Hoon Bong Hai Xu kian ping loh Byung Jin Cho Departmen t of Electrical Engineering KAIST Daejeon 305-701 Republic of Korea Department of Chemistry National University of Singapore Singapore 117543 Singapore

Cu 底层上的 graphene 的化学蒸汽免职 CVD 在需要的底层上启用大区域的单层 graphene 的制造。在综合 graphene 的转移期间，然而，地志的缺点不得已地沿着 Cu 谷物边界被形成，降级 graphene 的电的性质并且增加 device-to-device 可... 详细信息

Cu 底层上的 graphene 的化学蒸汽免职 CVD 在需要的底层上启用大区域的单层 graphene 的制造。在综合 graphene 的转移期间，然而，地志的缺点不得已地沿着 Cu 谷物边界被形成，降级 graphene 的电的性质并且增加 device-to-device 可变性。这里，我们作为一个表面预告的处理介绍 hot-pressing 的一个方法为谷物边界投出的抑制改进 Cu 薄电影的热稳定性。甚至在为 graphene 生长必要的随后的高温度 CVD 过程，和没有皱纹的 graphene 的形成被认识到以后，弄平的 Cu 薄电影维持它的光滑的表面。用 graphene 制作的 Graphene 域效果晶体管联邦货物税在 hot-pressed Cu 薄电影展览上级域效果活动性上综合了并且显著地减少了 device-to-device 变化。

关键词：铜薄膜石墨电气性能热压生长表面预处理 CVD工艺均匀