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Journal of Energy Chemistry 2023年第1期76卷 462-469,I0012页

作者： Xingxing Jiang Xuan Li Yan Kong Chen Deng Xiaojie Li Qi Hu Hengpan Yang Chuanxin He Institute of Microscale Optoelectronics College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060GuangdongChina

Earth-abundant and nontoxic Sn-based materials have been regarded as promising catalysts for the electrochemical conversion of CO_(2)to C1 products,e.g.,CO and formate.However,it is still difficult for Snbased materials to obtain satisfactory performance at low-to-moderate overpotentials.Herein,a simple and facile electrospinning technique is utilized to prepare a composite of a bimetallic Sn-Co oxide/carbon matrix with a hollow nanotube structure(Sn Co-HNT).Sn Co-HNT can maintain>90%faradaic efficiencies for C1 products within a wide potential range from-0.6 VRHE to-1.2 VRHE,and a highest 94.1%selectivity towards CO in an H-type cell.Moreover,a 91.2%faradaic efficiency with a 241.3 m A cm^(-2)partial current density for C1 products could be achieved using a flow cell.According to theoretical calculations,the fusing of Sn/Co oxides on the carbon matrix accelerates electron transfer at the atomic level,causing electron deficiency of Sn centers and reversible variation between Co^(2+)and Co^(3+)centers.The synergistic effect of the Sn/Co composition improves the electron affinity of the catalyst surface,which is conducive to the adsorption and stabilization of key intermediates and eventually increases the catalytic activity in CO_(2)electroreduction.This study could provide a new strategy for the construction of oxide-derived catalysts for CO_(2)electroreduction.

关键词： Hierarchic structure Tin-cobalt bimetallic oxide Electronic effect CO_(2)electroreduction Wide potential range

Janus heterostructure of cobalt and iron oxide as dual-functional electrocatalysts for overall water splitting

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Nano Research 2023年第2期16卷 2245-2251页

作者： Xiaojie Li Huike Zhang Xuan Li Qi Hu Chen Deng Xingxing Jiang Hengpan Yang Chuanxin He College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China

In electrocatalytic water splitting,low-cost dual-functional catalysts can not only reduce costs but also avoid cross-contamination of cathode and anode.However,the orderly aggregation of active sites for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)into a specific catalyst is very challenging.In this study,a Co/Fe_(3)O_(4)Janus heterojunction supported on carbon fiber paper(J-CoFe-CFP)is designed and successfully synthesized.Generally,Co-Fe oxides have preferable OER activity but weak HER activity.However,in J-CoFe-CFP,due to the intense and special electronic interaction of different substances(Co and Fe3O4)in the Janus heterogeneous interface,a huge number of tidy high-quality HER and OER active sites are uniformly distributed on the interface simultaneously,which endows the catalyst with both excellent HER and OER performance.In HER,the overpotential@10 mA·cm^(−2)(ηHER)is only 53.9 mV,and the Tafel slope is 43.7 mV·dec^(−1).In OER,theηis 272 mV,and the Tafel slope is 50.2 mV·dec^(−1),much lower than those of RuO_(2)/CFP.In the J-CoFe-CFP||J-CoFe-CFP two-electrode system,the required voltage is only 1.26 V at the beginning and 1.56 V@10 mA·cm^(−2),much lower than those of RuO_(2)/CFP||20%Pt/C/CFP.This work provides a Janus heterojunction pathway for bifunctional water electrolysis catalysts.

关键词： Janus bifunctional electrocatalytic water splitting CoFe

Structure engineering of PtCu_(3)/C catalyst from disordered to ordered intermetallic compound with heat-treatment for the methanol electrooxidation reaction

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Nano Research 2022年第5期15卷 3866-3871页

作者： Zihao Xing Jun Li Shun Wang Chenliang Su Huile Jin institute of New Materials&Industry Technology Wenzhou UniversityWenzhou 325024China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China

Platinum based alloys are hereinto the mostly used methanol oxidation catalysts.However,there are limited ways to improve the methanol oxidation reaction(MOR)performance of catalysts in terms of both activity and stability.Herein we developed a simple heat-treatment method to synthesize PtCu_(3)/C intermetallic compound catalyst with lattice compression.The as-prepared PtCu_(3)/C-1000 exhibited high specific activity of 3.23 mA·cm^(-1) and mass activity of 1,200 mA·mgPt^(-1),which is much higher than the PtCu_(3)/C-untreated and commercial Pt/C catalysts,respectively.The XAS and DFT results shows the high activity of the catalyst towards MOR comes from the tightening of the Pt-M bond,which leads to the decrease of Fermi energy level and the make it difficulty in adsorbing carbon intermediates,thus releasing more active sites to promote the improvement of MOR performance.Moreover,the PtCu_(3)/C-1000 shows better stability which is due to the surface-rich Pt prevents Cu from dissolution.

关键词： methanol electrooxidation PtCu_(3)alloy catalyst lattice compression composition reconstruction heat-treatment

Phoretic self-assembly of active colloidal molecules

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Chinese Physics B 2021年第5期30卷 57-62页

作者：雷李杰王硕张昕源赖文杰吴晋宇高永祥 institute for Advanced Study Shenzhen UniversityShenzhen 518060China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China

We simulate the self-assembly of active colloidal molecules from binary mixtures of spherical particles using a Brownian dynamics algorithm.These particles interact via phoretic interactions,which are determined by two independently tunable parameters,surface activity and surface mobility.In systems composed of equal-size particles,we observe the formation of colloidal molecules with well-defined coordination numbers and spatial arrangement,which also display distinct dynamic functions,such as resting,translating,and rotating.By changing the size ratio to 2:1 between the two species,we further observe the formation of colloidal molecules with new structures arising from breaking the size symmetry.By tuning the mutual interactions between the smaller species via their surface mobility,we are able to control their spacing as well as the coordination number of the colloidal molecules.This study highlights the importance of tuning surface parameters and size asymmetry in controlling the structure and the active dynamics of colloidal molecules.

关键词： Brownian dynamics diffusiophoresis active colloidal molecule self-assembly

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二维范德瓦尔斯异质结以及器件中的量子隧穿

Science China Materials 2021年第10期64卷 2359-2387页

作者：樊思迪曹睿王路得高姗张豫鹏庾翔张晗 International Collaborative Laboratory of 2D Materials for optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

基于能带结构的量子隧穿技术在电学、光电学、磁学等领域有着广泛的应用.它主要依赖于层-层的设计和构建,是一个涵盖了材料科学和创新技术的跨学科研究领域.自从二维层状材料被发现以来,基于二维范德华异质结构的隧道器件作为下一代器... 详细信息

基于能带结构的量子隧穿技术在电学、光电学、磁学等领域有着广泛的应用.它主要依赖于层-层的设计和构建,是一个涵盖了材料科学和创新技术的跨学科研究领域.自从二维层状材料被发现以来,基于二维范德华异质结构的隧道器件作为下一代器件得到了广泛的研究.二维材料具有原子层级的厚度,表面光滑且没有悬挂键.基于这些特性,采用二维材料构建的范德瓦尔斯异质结被认为具有优于传统Si工艺的隧道性能,还可获得小尺寸器件.本文从机理与应用两个角度对二维范德瓦尔斯异质结中的量子隧穿现象进行了综述.此外,分析了二维隧道器件面临的可能性和挑战,同时提出了对未来开发应用的展望.二维隧道器件的技术研究和性能控制尚处于起步阶段,但在实现低功耗、高速以及高频功能方面已经成为有竞争力的候选器件.

关键词： quantum tunneling 2D materials van der Waals heterostructures 2D quantum devices

LP modes exchange based on multiplane light conversion

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Chinese Optics Letters 2024年第3期22卷 14-18页

作者：钟亚楠林楚璇方浚丞雷霆袁小聪 Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Data exchange between different mode channels is essential in the optical communication network with mode-division multiplexing(MDM).However,there are challenges in realizing mode exchange with low insert loss,low mode crosstalk,and high integration.Here,we designed and fabricated a mode exchange device based on multiplane light conversion(MPLC),which supports the transmission of LP01,LP11a,LP11b,and LP21 modes in the C-band and L-band.The simulated exchanged mode purities are greater than 85%.The phase masks were fabricated on a silicon substrate to facilitate the integration with optical systems,with an insert loss of less than 2.2 dB and mode crosstalk below-21 dB due primarily to machining inaccuracies and alignment errors.We carried out an optical communication experiment with 10 Gbit/s OOK and QPSK data transmission at the wavelength of 1550 nm and obtained excellent performance with the device.It paves the way for flexible data exchange as a building block in MDM optical communication networks.

关键词： mode exchange mode-division multiplexing multiplane light conversion

Dynamic polarization rotation and vector field steering based on phase change metasurface

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Frontiers of physics 2023年第1期18卷 193-199页

作者： Hairong He Hui Yang Zhenwei Xie Xiaocong Yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-scale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Polarization rotation and vector field steering of electromagnetic wave are of great significance in modern optical applications.However,conventional polarization devices are bulky,monofunctional and lack of tunability,which pose great challenges to the miniaturized and multifunctional applications.Herein,we propose a meta-device that is capable of multi-state polarization rotation and vector field steering based on phase change metasurface.The supercell of the meta-device consists of four Ge2Sb2Te5(GST)elliptic cylinders located on a SiO2 substrate.By independently controlling the phase state(amorphous or crystalline)of each GST elliptic cylinder,the meta-device can rotate the polarization plane of the linearly polarized incident light to different angles that cover from 19.8°to 154.9°at a wavelength of 1550 nm.Furthermore,by merely altering the phase transition state of GST elliptic cylinders,we successfully demonstrated a vector field steering by generating optical vortices carrying orbital angular momentums(OAMs)with topological charges of 0,1 and–1,respectively.The proposed method provides a new platform for investigating dynamically tunable optical devices and has potential applications in many fields such as optical communications and information processing.

关键词： polarization rotation vector field steering phase change metasurface

具有超低开关电场的可控的易失性至非易失性单晶无铅双钙钛矿忆阻器

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Science China Materials 2023年第1期66卷 241-248页

作者：游琪黄富房菲儿祝家齐郑越方绍帆周勃李贺楠韩成时玉萌 International Collaborative Laboratory of 2D Materials for optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China

全无机无铅双钙钛矿由于其优异的电子传输能力、高光敏性、低毒性和环境稳定性,为电子/光电存储器件提供了潜在的材料.然而,钙钛矿薄膜的多晶性质严重限制了器件性能.在此,我们展示了一种基于单晶双钙钛矿Cs_(2)AgBiBr_(6)的高性能忆阻... 详细信息

全无机无铅双钙钛矿由于其优异的电子传输能力、高光敏性、低毒性和环境稳定性,为电子/光电存储器件提供了潜在的材料.然而,钙钛矿薄膜的多晶性质严重限制了器件性能.在此,我们展示了一种基于单晶双钙钛矿Cs_(2)AgBiBr_(6)的高性能忆阻器,其具有6.67×10^(4)V m^(-1)的超低开关电场和10^(7)的高电流开/关比.值得注意的是,Cs_(2)AgBiBr_(6)的电阻开关行为与单晶钙钛矿的厚度相关,当单晶厚度从100到800 nm变化时,忆阻器从易失性的阈值开关行为演变为非易失性的忆阻开关行为.元素分析表明,Cs_(2)AgBiBr_(6)中导电通道的形成与具有低活化能Br空位的迁移有关.此外,形成的导电通道可以被具有不同波长和强度的光照湮灭,从而实现具有单独的电写入和光擦除的光电存储器.我们的研究结果为单晶钙钛矿中的离子迁移提供了深刻的见解,并为其在未来的电子和光电存储器中的应用提供了理论基础.

关键词：非易失性存储器忆阻器环境稳定性电子传输导电通道电阻开关离子迁移

A Multifunctional Anti-Proton Electrolyte for High-Rate and Super-Stable Aqueous Zn-Vanadium Oxide Battery

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Nano-Micro Letters 2022年第9期14卷 272-289页

作者： Yangwu Chen Dingtao Ma Kefeng Ouyang Ming Yang Sicheng Shen Yanyi Wang Hongwei Mi Lingna Sun Chuanxin He Peixin Zhang College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060People’s Republic of China

Large volumetric expansion of cathode hosts and sluggish transport kinetics in the cathode–electrolyte interface,as well as dendrite growth and hydrogen evolution at Zn anode side are considered as the system problems that cause the electrochemical failure of aqueous Zn-vanadium oxide battery.In this work,a multifunctional anti-proton electrolyte was proposed to synchronously solve all those issues.Theoretical and experimental studies confirm that PEG 400 additive can regulate the Zn^(2+) solvation structure and inhibit the ionization of free water molecules of the electrolyte.Then,smaller lattice expansion of vanadium oxide hosts and less associated by-product formation can be realized by using such electrolyte.Besides,such electrolyte is also beneficial to guide the uniform Zn deposition and suppress the side reaction of hydrogen evolution.Owing to the integrated synergetic modifica-tion,a high-rate and ultrastable aqueous Zn-V_(2)O_(3)/C battery can be constructed,which can remain a specific capacity of 222.8 m Ah g^(-1)after 6000 cycles at 5 A g^(-1),and 121.8 m Ah g^(-1) even after 18,000 cycles at 20 A g^(-1),respectively.Such“all-in-one”solution based on the electrolyte design provides a new strategy for developing high-performance aqueous Zn-ion battery.

关键词： Zn-vanadium oxide battery Multifunctional anti-proton electrolyte Integrated synergetic modification “All-in-one”solution

Detection of cylindrical vector beams with chiral plasmonic lens

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Chinese Optics Letters 2022年第2期20卷 182-186页

作者：张创业闵长俊张聿全付亚男李灵王玉龙袁小聪 Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

The cylindrical vector beam(CVB) has been extensively studied in recent years, but detection of CVBs with on-chip photonic devices is a challenge. Here, we propose and theoretically study a chiral plasmonic lens structure for CVB detection. The structure illuminated by a CVB can generate single plasmonic focus, whose focal position depends on the incident angle and the polarization order of CVB. Thus, the incident CVB can be detected according to the focal position and incident angle and with a coupling waveguide to avoid the imaging of the whole plasmonic field. It shows great potential in applications including CVB-multiplexing integrated communication systems.

关键词： cylindrical vector beam surface plasmon polaritons metasurface optical vortices