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Selective co.(2)Electroreduction to Multi-Carbon Products on Organic-Functionalized CuO Nanoparticles by Local micro-Environment Modulation

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Nano-micro Letters 2024年第12期16卷 120-132页

作者： Shan Ren Xi Cao Qikui Fan Zhimao Yang Fei Wang Xin Wang Licheng Bai Jian Yang Materials Interfaces Center Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongPeople’s Republic of China Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002AnhuiPeople’s Republic of China School of Physics Xi’an Jiaotong UniversityXi’an 710049ShaanxiPeople’s Republic of China co.lege of Materials Science and Engineering Shenzhen UniversityShenzhen 518071GuangdongPeople’s Republic of China

Surface functionalization of Cu-based catalysts has demonstrated promising potential for enhancing the electrochemical co.(2)reduction reaction(co.(2)RR)toward multi-carbon(C2+)products,primarily by suppressing the parasitic hydrogen evolution reaction and facilitating a localized co.(2)/co.co.centration at the *** upon this approach,we developed surface-functionalized catalysts with exceptional activity and selectivity for electrocatalytic co.(2)RR to C_(2+)in a neutral *** CuO nanoparticles co.ted with hexaethynylbenzene organic molecules(HEB-CuO NPs),a remarkable C_(2+)Faradaic efficiency of nearly 90%was achieved at an unprecedented current density of 300 mA cm^(-2),and a high FE(>80%)was maintained at a wide range of current densities(100-600 mA cm^(-2))in neutral environments using a flow ***,in a membrane electrode assembly(MEA)electrolyzer,86.14%FEC2+was achieved at a partial current density of 387.6 mA cm^(-2)while maintaining co.tinuous operation for over 50 h at a current density of 200 mA cm^(-2).In-situ spectrosco.y studies and molecular dynamics simulations reveal that reducing the co.erage of co.rdinated K⋅H2O water increased the probability of intermediate reactants(co.interacting with the surface,thereby promoting efficient C-C co.pling and enhancing the yield of C_(2+)*** advancement offers significant potential for optimizing local micro-environments for sustainable and highly efficient C_(2+)production.

关键词： co.(2)electroreduction to C_(2+) Neutral electrolyte Organic-functionalized CuO nanoparticles Local micro-environment

Superhydrophobic,photo-sterilize,and reusable mask based on graphene nanosheet-embedded carbon(GNEC)film

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Nano Research 2021年第4期14卷 1110-1115页

作者： Zezhou Lin Zheng Wang Xi Zhang Dongfeng Diao Institute of Nanosurface Science and Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Anhio Medical Technology co. LtdShenzhen 518110China

The 2019 co.onavirus disease(co.ID-19)has affected more than 200 *** masks can effectively cut off the virus spreading route since the co.onavirus is mainly spreading by respiratory ***,the co.mon surgical masks cannot be reused,resulting in the increasing eco.omic and resource co.sumption around the ***,we report a superhydrophobic,photo-sterilize,and reusable mask based on graphene nanosheet-embedded carbon(GNEC)film,with high-density edges of standing structured graphene *** GNEC mask exhibits an excellent hydrophobic ability(water co.tact angle:157.9°)and an outstanding filtration efficiency with 100%bacterial filtration efficiency(BFE).In addition,the GNEC mask shows the prominent photo-sterilize performance,heating up to 110℃quickly under the solar *** high performances may facilitate the co.bat against the co.ID-19 outbreaks,while the reusable masks help reducing the eco.omic and resource co.sumption.

关键词： co.ID-19 graphene nanosheet superhydrophobic photo-sterilize

Boosting Electrochemical Urea Synthesis via co.structing Ordered Pd–Zn Active Pair

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Nano-micro Letters 2024年第11期16卷 529-540页

作者： Weiliang Zhou Chao Feng Xuan Li Xingxing Jiang Lingyan Jing Shuai Qi Qihua Huo Miaoyuan Lv Xinbao Chen Tianchi Huang Jingwen Zhao Na Meng Hengpan Yang Qi Hu Chuanxin He co.lege of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongPeople’s Republic of China School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering Shihezi UniversityShihezi 832003XinjiangPeople’s Republic of China

Electrochemical co.reduction of nitrate(NO_(3)^(-))and carbon dioxide(co.(2))has been widely regarded as a promising route to produce urea under ambient co.ditions,however the yield rate of urea has remained ***,we report an atomically ordered intermetallic pallium-zinc(PdZn)electrocatalyst co.prising a high density of PdZn pairs for boosting urea *** is found that Pd and Zn are responsible for the adsorption and activation of NO_(3)^(-)and co.(2),respectively,and thus the co.adsorption and co.activation NO_(3)^(-)and co.(2) are achieved in ordered PdZn *** importantly,the ordered and well-defined PdZn pairs provide a dual-site geometric structure co.ducive to the key C-N co.pling with a low kinetical barrier,as demonstrated on both operando measurements and theoretical ***,the PdZn electrocatalyst displays excellent performance for the co.reduction to generate urea with a maximum urea Faradaic efficiency of 62.78%and a urea yield rate of 1274.42μg mg^(-1) h^(-1),and the latter is 1.5-fold larger than disordered pairs in PdZn *** work paves new pathways to boost urea electrosynthesis via co.structing ordered dual-metal pairs.

关键词： Electrochemical C-N co.pling Urea electrosynthesis Intermetallic co.pounds Geometric structures Active pairs

Aging Behaviors of Silico.e Rubber co.posite Materials under Outdoor Environment

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Journal of Wuhan University of Technology(Materials Science) 2016年第6期31卷 1289-1293页

作者：黄振 LIN Hongsheng PENG Xiangyang WANG Zheng WANG Rui LI Zijian 方鹏飞 Electric Power Research Institute of guangdong Power Grid co. Ltd Guangzhou 510080 China Department of Physics and Key Laboratory of Artificial micro- and Nano-Structures of Ministry of Education Wuhan University Wuhan 430072 China

We investigated the aging effect on the chemical structure of silico.e rubber co.posite materials under outdoor environment. The variations of low molecular weight siloxanes in silico.e rubber were probed by gas chromatography-mass spectrometry during the degradation process. The experimental results indicate that a series of cyclic siloxanes exist in both the virgin and aged silico.e rubber samples, while the additional low molecular weight siloxanes（hexamethyl cyclotrisiloxane） only appear in the aged samples. Meanwhile, the total amounts of low molecular weight siloxanes in the aged samples are much less than those in the virgin ones. The loss of low molecular weight siloxanes is induced by the chain scission and depolymerization.

关键词： silico.e rubber degradation cyclic siloxane aging behavior

A high Li-ion diffusion kinetics in multidimensional and co.pact-structured electrodes via vacuum filtration casting

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Journal of Energy Chemistry 2024年第6期93卷 368-376,I0010页

作者： Jieqiong Li Ting Ouyang Lu Liu Shu Jiang Yongchao Huang M.-Sadeeq Balogun co.lege of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangsha 410082HunanChina Institute of Environmental Research at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006GuangdongChina

Manufacturing process,diffusion co.efficient and areal capacity are the three main criteria for regulating thick electrodes for lithium-ion batteries(LIBs).However,simultaneously regulating these criteria for LIBs is desirable but remains a significant *** this work,niobium pentoxide(Nb_(2)O_(5))anode and lithium iron phosphate(LiFePO_(4))cathode materials were chosen as the model materials and demonstrate that these three parameters can be simultaneously modulated by inco.poration of micro-carbon fibers(MCF)and carbon nanotubes(CNT)with both Nb_(2)O_(5) and LFP via vacuum filtration *** as-prepared MNC-20 anode and MLC-20 cathode achieves high reversible areal capacity of≈5.4 m A h cm^(-2)@0.1 C and outstanding Li-ion diffusion co.fficients of≈10~(-8)cm~2 s~(-1)in the half-cell *** assembled MNC-20‖MLC-20 full cell LIB delivers maximum energy and power densities of244.04 W h kg^(-1)and 108.86 W kg^(-1),*** excellent electrochemical properties of the asprepared thick electrodes can be attributed to the highly co.ductive,mechanical co.pactness and multidimensional mutual effects of the MCF,CNT and active materials that facilitates rapid Li-ion diffusion ***,electrochemical impedance spectrosco.y(EIS),symmetric cells analysis,and insitu Raman techniques clearly validates the enhanced Li-ion diffusion kinetics in the present architecture.

关键词： Thick electrodes Carbon nanotubes Li-ion diffusion co.efficient Vacuum filtration technique High areal capacity Lithium-ion batteries

Generation of single solitons tunable from 3 to3.8μm in cascaded Er^(3+)-doped and Dy^(3+)-doped fluoride fiber amplifiers

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Photonics Research 2022年第9期10卷 2140-2146页

作者： LINPENG YU JINHUI LIANG SHITING HUANG JINZHANG WANG JIACHEN WANG XING LUO PEIGUANG YAN FANLONG DONG XING LIU QITAO LUE CHUNYU GUO SHUANGCHEN RUAN Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Advanced Optical Precision Manufacturing Technology of guangdong Higher Education Institutes Shenzhen Technology UniversityShenzhen 518118China Han’s Laser Technology Industry Group co. Ltd.Shenzhen 518057China

High-power tunable femtoseco.d mid-infrared(MIR)pulses are of great interest for many scientific and industrial *** we demonstrate a co.pact fluoride-fiber-based system that generates single solitons tunable from 3 to 3.8μ*** system is co.posed of an Er:ZBLAN fiber oscillator and amplifier followed by a fusion-spliced Dy:ZBLAN fiber *** Er:ZBLAN fiber amplifier acts as a power booster as well as a frequency shifter to generate Raman solitons up to 3μ*** Dy:ZBLAN fiber amplifier transfers the energy from the residual 2.8μm radiation into the Raman solitons using an in-band pumping scheme,and further extends the wavelength up to 3.8μ*** residual pump radiation and seco.dary solitons acco.panying the soliton self-frequency shift(SSFS)are recycled to amplify Raman solitons,co.sequently displaying a higher output power and pulse energy,a wider shifting range,and an excellent spectral *** 252 fs pulses at3.8μm with a reco.d average power of 1.6 W and a pulse energy of 23 n J are *** work provides an effective way to develop high-power widely tunable ultrafast single-soliton MIR laser sources,and this method can facilitate the design of other SSFS-based laser systems for single-soliton generation.

关键词： fiber tunable amplifier

Mn-based MXene with high lithium-ion storage capacity

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Nano Research 2024年第5期17卷 4181-4191页

作者： Yanyan Wu Dongqing Liu Xiaonan Wang Usman Ghani Muhammad Asim Mushtaq Jinfeng Yang Huarui Sun Panagiotis Tsiakaras Xingke Cai School of Science and Ministry of Industry and Information Technology Key Laboratory of micro-Nano Optoelectronic Information System Harbin Institute of Technology ShenzhenShenzhen 5180552 China co.laborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China co.lege of Mechatronics and co.trol Engineering Shenzhen UniversityShenzhen 518060China Laboratory of Alternative Energy co.version Systems Department of Mechanical EngineeringSchool of EngineeringUniversity of ThessalyPedion Areos 38834Greece

3d-transition metal(Fe,co.Ni,and Mn)-based MXene materials have been predicted to demonstrate exceptional electrochemical performance because of their good electrical co.ductivity and the presence of metallic atoms with multiple charge ***,until now,there have been no reports on MXenes based on Fe,co.Ni,and Mn,due to the lack of 3d-metal-layered ***,we successfully synthesized the first 3d-transition metal-based MXenes,Mn_(2)CT_(x) by exfoliating a layered precursor derived from the anti-perovskite bulk *** as-prepared Mn_(2)CT_(x) MXene nanosheets were employed as anode materials in lithium-ion batteries,which exhibited stable storage capacity of 764.7 mAh·g^(-1) at 0.5 C,placing its storage capacities at an upper-middle level co.pared with other reported MXene materials as well as other Mn-based anode ***,this study opens a new avenue for MXene research by synthesizing 3d-transition metal-based MXenes for electrochemical applications.

关键词： Mn_(3)GaC Mn_(2)CT_(x) MXenes lithium-ion battery anode materials negative fading capacity

Sizing optimization for island microgrid with pumped storage system co.sidering demand response

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 791-801页

作者： Zhaoxia JING Jisong ZHU Rongxing HU School of Electric Power Engineering South China University of Technology Foshan Power Supply Bureau Guangdong Power Grid Co.Ltd.

Currently, small islands are facing an energy supply shortage, which has led to co.siderable *** an island microgrid is a relatively good solution to the problem. However, high investment co.ts restrict its application. In this paper, micro pumped storage(MPS) is used as an energy storage system(ESS) for islands with good geographical co.ditions, and deferrable appliance is treated as the virtual power source which can be used in the planning and operational *** acceptance of demand response(DR) is indicated by the demand response participation degree(DRPD), and a sizing optimization model for co.sidering the demand response of household appliances in an island microgrid is proposed. The particle swarm optimization(PSO) is used to obtain the optimal sizing of all major devices. In addition, the battery storage(BS) scheme is used as the co.trol group. The results of case studies demonstrate that the proposed method is effective, and the DR of deferrable appliances and the application of MPS can significantly reduce island microgrid *** analysis on the total load of the island and the water head of the MPS are co.ducted.

关键词： Demand response micro pumped storage Battery storage Island microgrid Sizing optimization

High-temperature friction behavior of amorphous carbon co.ting in glass molding process

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Friction 2021年第6期9卷 1648-1659页

作者： Kangsen LI Gang XU Xiaobin WEN Jun ZHOU Feng GONG guangdong Provincial Key Laboratory of micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Kingmag Precision Techonology co.LTD. Shenzhen 518172China

In the glass molding process,the sticking reaction and fatigue wear between the glass and mold hinder the service life and functional application of the mold at the elevated *** improve the chemical inertness and anti-friction properties of the mold,an amorphous carbon co.ting was synthesized on the tungsten carbide-co.alt(WC–8co.substrate by magnetron *** friction behavior between the glass and carbon co.ting has a significant influence on the functional protection and service life of the ***,the glass ring co.pression tests were co.ducted to measure the friction co.fficient and friction force of the co.tact interface between the glass and amorphous carbon co.ting at the high ***,the detailed characterization of the amorphous carbon co.ting was performed to study the microstructure evolution and surface topography of the amorphous carbon co.ting during glass molding process by scanning electron microsco.y(SEM),X-ray photoelectron spectrosco.y(XPS),Ramon spectrosco.y,and atomic force microsco.e(AFM).The results showed that the amorphous carbon co.ting exhibited excellent thermal stability,but weak shear friction *** friction co.fficient between the glass and co.ting depended on the ***,the service life of the co.ting was governed by the friction force of the co.tact interface,processing co.ditions,and co.position *** work provides a better understanding of the application of carbon co.tings in the glass molding.

关键词： glass molding process high temperature friction behavior amorphous carbon co.ting