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Mesoporous silica anchored on reduced graphene oxide nanocomposite as anode for superior lithium-ion capacitor

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Rare Metals 2022年第2期41卷 368-377页

作者： Sherif A.El-Khodary Gokila Subburam Bo-Bo Zou Juan Wang Jing-Xia Qiu Xian-hu liu dickon h.l.ng Shuang Wang Jia-Biao lian School of Energy and Power Engineering Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China Building Physics and Environment Institute Housing and Building National Research Center(HBRC)Dokki 12311CairoEgypt School of Energy and Power Engineering Institute for Energy ResearchSchool of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China Key laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China Department of Physics The Chinese University of Hong KongShatinHong Kong 999077China School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China

Mesoporous silica(mSiO_(2))has attracted great interest as anode for lithium-ion ***,the low intrinsic conductivity is a major challenge for its *** this study,a low-cost sol–gel method is employed to synthesize mesoporous silica anchored on graphene nanosheets(rGO)for lithium *** results exhibit that the nanocomposite(mSiO_(2)@rGO)with high surface area(616.45 m^(2)·g^(–1))has chemical coupling bonds(Si–O–C)between SiO2 and rGO species,which would be favorable for lithium storage upon synergistic ***,the mSiO_(2)@rGO exhibits a high specific capacity of 1119.6 mAh·g^(–1)at 0.1 A·g^(–1)with outstanding cycling stability(92.5%retention over 1400 cycles at 1.0 A·g^(–1)).

关键词： lithium cycling synergistic

liFePO_(4)and liMn_(2)O_(4)nanocomposite coating of liNi_(0.815)Co_(0.15)Al_(0.035)O_(2)cathode material for high-performance lithium-ion battery

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Rare Metals 2022年第8期41卷 2560-2566页

作者： Zi-Wei lan Jian-Ru Zhang Yuan-Yuan li Ru-heng Xi Yong-Xiang Yuan lei Zhao Xiao-Yi hou Jia-Tai Wang dickon h.l.ng Cai-hong Zhang College of Physics and Electronic Information Engineering Qinghai Normal UniversityXining810008China Department of Physical Science and Technology Lingnan Normal UniversityZhanjiang524048China Department of Physics The Chinese University of Hong KongHong Kong999077China

To solve the multiple problems of low ionic conductivity,fast capacity decay,and poor cycling performance of Nirich layered cathode materials,liNi_(0.815)Co_(0.15)Al_(0.035)O_(2)@liFePO_(4)@liMn_(2)O_(4)(NCA@lFP@lMO,abbreviated as AFM)series cathode materials with different coating ratios were synthesized by a two-step ball milling method and precise control of the mass coating ratio of lFP and *** cathode material of NCA,lFP and lMO with a mass ratio of 8:1:1(A_(8)F_(1)M_(1))presents a more desirable nanocomposite coating and still can deliver a discharge capacity of 151.67 mAh·g^(-1)(with a 94.52%capacity retention)after 200 cycles at 1.0 ***.

关键词： coating cycling performance

Fe_(2)TiO_(5)nanochains as anode for high-performance lithium-ion capacitor

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Rare Metals 2021年第9期40卷 2424-2431页

作者： Rong Kang Wang-Qin Zhu Sheng li Bo-Bo Zou liao-liao Wang Guo-Chun li Xian-hu liu dickon h.l.ng Jing-Xia Qiu Yan Zhao Fen Qiao Jia-Biao lian Key laboratory of Zhenjiang Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China Key laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China Department of Physics The Chinese University of Hong KongShatinHong Kong 999077China

The unique crystal structure and multiple redox couples of iron titanate(Fe_(2)TiO_(5)) provide it a high theoretical capacity and good cycling stability when used as an electrode. In this study, the electrospinning method is employed to synthesize one-dimensional(1 D) Fe_(2)TiO_(5) nanochains. The as-prepared Fe_(2)TiO_(5) nanochains exhibited superior specific capacity(500 mAh·g^(-1) at 0.10 A·g^(-1)),excellent rate performance(180 mAh·g^(-1) at 5.00 A·g^(-1)),and good cycling stability(retaining 100% of the initial specific capacity at a current density of 1.00 A·g^(-1) after1000 cycles). The as-assembled Fe_(2)TiO_(5)/SCCB lithiumion capacitor(lIC) also delivered a competitive energy density(137.8 Wh·kg^(-1))andpowerdensity(11,250 W·kg^(-1)). This study proves that the as-fabricated1 D Fe_(2)TiO_(5) nanochains are promising anode materials for high-performance lICs.

关键词： lithium-ion capacitors high energy/power densities Anode material Fe_(2)TiO_(5)nanochains Electrospinning

Nitrogen-doped porous carbon nanofoams with enhanced electrochemical kinetics for superior sodium-ion capacitor

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Rare Metals 2022年第7期41卷 2481-2490页

作者： K.Ramachandran Gokila Subburam Xian-hu liu Ming-Gang huang Chun Xu dickon h.l.ng Ying-Xue Cui Guo-Chun li Jing-Xia Qiu Chuan Wang Jia-Biao lian Institute for Energy Research Jiangsu UniversityZhenjiang 212013China Key laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China Key laboratory of Fine Chemical Application Technology of luzhou Luzhou 646099China Department of Physics The Chinese University of Hong KongHong Kong 999077China Jiangsu National Synergetic Innovation Center for Advanced Materials School of Chemistry and Molecular EngineeringInstitute of Advanced SynthesisNanjing Technology UniversityNanjing 211800China

Many electrochemical energy storage devices,such as batteries,supercapacitors,and metal ion capacitors,rely on effective and inexpensive electrode ***,we have developed highly active nitrogen-doped porous carbon nanofoams(NPCNs-600-N)for sodium-ion capacitors(SICs).NPCNs-600-N have a highly porous framework,extended interlayer spacing(0.41 nm),and lots of surface functional ***,NPCNs-600-N achieves a high reversible capacity(301 mAh·g^(-1)at 0.05 A·g^(-1)),superior rate capability(112 mAh·g^(-1)at 5.00 A·g^(-1)),and ultra-stable *** excellent rate and cycling performance originate from the abundant active sites and porous architecture of ***-more,SICs device is constructed by employing the NPCNs-600-N as the battery-like anode and commercial superconductive carbon black as the capacitive cathode,which delivers high energy/power densities of 92 Wh·kg^(-1)/15984 W·kg^(-1)with a remarkable cyclability(93%reten-tion over 5000 cycles at 1.00 A·g^(-1)).The methodology of the work enables the simultaneous tuning of the porous architectures and surface function groups of carbon for high-performance SICs.

关键词： Carbon nanofoams Nitrogen-doping Porous structure Kinetics analysis Sodium-ion capacitors

Effect of homojunction structure in boosting sodium-ion storage: The case of MoO_(2)

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Journal of Energy Chemistry 2023年第3期78卷 115-122,I0004页

作者： Sheng li Wei Zhang Yingxue Cui Jianmin Ma hong-Jie Peng Jun li Xianhu liu dickon hlng Xinyan liu Jiabiao lian Institute for Energy Research Jiangsu UniversityZhenjiang 212013JiangsuChina School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Key laboratory of Materials Processing&Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina School of Science and Engineering The Chinese University of Hong Kong(Shenzhen)LonggangShenzhen 518172GuangdongChina

high-efficiency sodium-ion batteries(SIBs) are in great demand for energy storage applications,which are dominated by the Na+storage performance of electrode ***,a one-pot solvothermal method is developed to construct amorphous/crystalline MoO_(2)(a/c-MoO_(2)) homojunction for boosting Na+*** simulations signify that electrons redistribute at the homogenous interface of a/c-MoO_(2),resulting in an inbuilt driving force to easily adsorb charge carriers and promote the electron/ion transfer *** on its crystallographic superiorities,the a/c-MoO_(2)homojunction with high Na adsorbability(-1.61 eV) and low Na diffusion energy barrier(0.519 eV) achieves higher capacity(307 mA h g^(-1)at 0.1 A/g),better rate capability and cycling stability than either a-MoO_(2)or c-MoO_(2)*** in-situ X-ray diffraction(XRD) and ex-situ X-ray photoelectron spectroscopy(XPS)techniques,the ’adsorption-insertion-conversion’ mechanism is well established for Na+storage of MoO_(2).Our work opens new opportunities to optimize electrode materials via crystallographic engineering for efficient Na+storage,and helps to better understand the effects of homojunction structure in enhanced electrochemical performance.

关键词： MoO_(2)homojunction Crystallographic engineering Theoretical calculations In-situ XRD Na^(+)storage mechanism

In situ XRD and electrochemical investigation on a new intercalation-type anode for high-rate lithium ion capacitor

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Journal of Energy Chemistry 2021年第6期30卷 109-117,I0004页

作者： Bobo Zou Ting Wang Shengyuan li Rong Kang Guochun li Sherif AEl-Khodary dickon hlng Xianhu liu Jingxia Qiu Yan Zhao Jiabiao lian huaming li Institute for Energy Research Jiangsu UniversityZhenjiang 212013JiangsuChina Nanyang Environment and Water Research Institute(NEWRI) Interdisciplinary Graduate School(IGS)Nanyang Technological University50 Nanyang Avenue639798Singapore Department of Physics The Chinese University of Hong KongShatinHong KongChina Key laboratory of Materials Processing&Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina

A new intercalation-type anode material is reported herein to improve the lithium storage kinetics for high-rate lithium ion *** crystal structure of orthorhombic NaNbO3 indicates two possible tunnels for lithium ions insertion into NaNbO3 host along theand***,in situ XRD is conducted to investigate the lithium storage mechanism and structural evolution of the NaNb O_(3) anode,demonstrating its intercalation behavior through(101)and(141)***,the rGO nanosheets are introduced to facilitate the charge transfer,which also effectively prevent the aggregation of NaNbO3 *** expected,the NaNbO_(3)/rGO nanocomposites possess remarkable reversible capacity(465 mA h g^(-1) at 0.1 A g^(-1)),superior rate capability(325 mA h g^(-1) at 1.0 A g^(-1))and cycling stability,attributed to their synergistic effect and high li+diffusion coefficient Dli[D(NaNbO_(3)/rGO)/D(NaNbO_(3))≈31.54].Remarkably,the NaNbO3/rGO-based lIC delivers a high energy density of 166.7 W h kg^(-1) at 112.4 W kg^(-1) and remains 24.1 W h kg^(-1) at an ultrahigh power density of26621.2 W kg^(-1),with an outstanding cycling durability(90%retention over 3000 cycles at 1.0 A g^(-1)).This study provides new insights on novel intercalation-type anode material to enrich the materials system of lICs.

关键词： lithium ion capacitor Intercalation-type anode NaNbO3 nanocubes In situ XRD high energy/power densities

Preparation and Characterization of Activated Carbon Fiber from Paper

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Chinese Journal of Chemical Physics 2011年第1期24卷 103-108,I0004页

作者：张宗见李嘉孙富升吴恒亮邝丰栾刘世权济南大学材料科学与工程学院济南250022 香港中文大学物理系香港

Activated carbon fibers （ACFS） with surface area of 1388 m2/g prepared from paper by chemical activation with KOh has been utilized as the adsorbent for the removal of methylene blue from aqueous solution. The experimental data were analyzed by langmuir and Freundlich models of adsorption. The effects of ph value on the adsorption capacity of ACFS were also investigated. The rates of adsorption were found to conform to the kinetic model of Pseudo-second-order equation with high values of the correlation coefficients （R〉0.998）. The langmuir isotherm was found to fit the experimental data better than the Feundlich isotherm over the whole concentration range. Maximum adsorption capacity of 520 mg/g at equilibrium was achieved. It was found that ph played a major role in the adsorption process, higher ph value favored the adsorption of MB.

关键词： Activated carbon fiber Paper Microstructure Adsorption Methylene blue

Single-pilot operations in commercial flight:Effects on neural activity and visual behaviour under abnormalities and emergencies

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Chinese Journal of Aeronautics 2024年第8期37卷 277-292页

作者： Qinbiao lI Chun-hsien ChEN Kam K.h.ng Xin YUAN Cho Yin YIU human Factors and Ergonomics laboratory Department of Aeronautical and Aviation EngineeringThe Hong Kong Polytechnic UniversityHong Kong Special Administrative Region 100872China School of Mechanical&Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

With cutting-edge technologies and considering airline human-resource-saving,a single pilot in commercial jets could be technically *** changes in captains’natural behaviours are initially required to comprehend the specific safe human performance envelope for safeguarding single-pilot flight,particularly in high-risk *** paper investigates how captains’performance transforms for fixing emergencies when operating from Dual-Pilot Operations(DPO)to Single-Pilot Operations(SPO)through a physiological-based *** pilots flew an emergency-included flight with/without first officers’*** neural activities and scanning behaviours were recorded using a 32-channel Electroencephalogram(EEG)and glasses-based eye tracker,with the observation and post-experiment questionnaires to evaluate the flight operations and pilots’*** alone,there was a significantly increased cortical activity in h and b waves over the frontal,parietal,and temporal lobes during the more complicated emergencies,and pilots focused less on the primary flight display while spending significantly more time scanning the other *** physiological fluctuating patterns associated with risky operations in SPO were highlighted by cross-correlating multimodal *** experimental-based noteworthy insights may wish to inform commercial SPO measures to lessen the persistent physiological fluctuation,assisting airlines in creating SPO-oriented intelligent flight systems to give captains adequate support for assuring safer air transportation.

关键词： Aviation engineering Single pilot operations Behaviour changes Eye tracker Electroencephalogram

Jetting-based bioprinting:process,dispense physics,and applications

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Bio-Design and Manufacturing 2024年第5期7卷 771-799页

作者： Wei long ng Viktor Shkolnikov Singapore Centre for 3D Printing(SC3DP) School of Mechanical and Aerospace EngineeringNanyang Technological University(NTU)Singapore 639798Singapore hP Inc. Palo AltoCA 94304USA

Jetting-based bioprinting facilitates contactless drop-on-demand deposition of subnanoliter droplets at well-defined positions to control the spatial arrangement of cells,growth factors,drugs,and biomaterials in a highly automated layer-by-layer fabrication *** to its immense versatility,jetting-based bioprinting has been used for various applications,including tissue engineering and regenerative medicine,wound healing,and drug development.A lack of in-depth understanding exists in the processes that occur during jetting-based *** review paper will comprehensively discuss the physical considerations for bioinks and printing conditions used in jetting-based *** first present an overview of different jetting-based bioprinting techniques such as inkjet bioprinting,laser-induced forward transfer bioprinting,electrohydrodynamic jet bioprinting,acoustic bioprinting and microvalve ***,we provide an in-depth discussion of various considerations for bioink formulation relating to cell deposition,print chamber design,droplet formation and droplet ***,we highlight recent accomplishments in jetting-based *** present the advantages and challenges of each method,discuss considerations relating to cell viability and protein stability,and conclude by providing insights into future directions of jetting-based bioprinting.

关键词： 3D bioprinting Biofabrication Jetting-based Dispense physics Machine learning