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Construction of highly active WO_(3)/TpPa-1-COF S-scheme heterojunction toward photocatalytic H_(2)generation

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Journal of Materials Science & Technology 2022年第28期123卷 41-48页

作者： Long Sun Lingling Li Jiajie Fan quanlong xu Dekun Ma School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325027China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process Shaoxing UniversityShaoxing 312000China

The rapid charge recombination and low surface reaction kinetics are the two major constraints to the photocatalytic performance of covalent organic frameworks(COFs).To accelerate the charge separation behavior,TpPa-1-COF is decorated with WO_(3)Bvia an in-situ growth approach,and the resultant WO_(3)/TpPa-1-COF composites show significantly improved photocatalytic performance.Especially,when the WO_(3)loading arrives at 3 wt%,3%WO_(3)/TpPa-1-COF exhibits the maximum photocatalytic H_(2)evolution rate of 19.89 mmol g^(-1)h^(-1),which is approximately 4.8 times higher than that of pure TpPa-1-COF.The apparent quantum efficiency(AQE)of 3%WO_(3)/TpPa-1-COF at 420 nm is detected to be 12.4%.X-ray photoelectron spectroscopy(XPS)characterization confirms the formation of internal electric field between WO_(3)and TpPa-1-CF,which can drive the photogenerated charge carrier diffusion in S-scheme mode.As a result,WO_(3)/TpPa-1-COF composite possesses high charge separation efficiency and strong redox ability,which is further supported by the photoelectrochemical results,thus benefiting the photocatalysis process.This work provides a rational strategy to modify COFs in photocatalytic water splitting.

关键词： Covalent organic framework(COF) WO_(3) S-scheme heterojunction Photocatalytic H_(2)evolution

Design principle of S-scheme heterojunction photocatalyst

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Journal of Materials Science & Technology 2022年第29期124卷 171-173页

作者： quanlong xu S.Wageh Ahmed A.Al-Ghamdi Xin Li Key laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou325027China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou510642China

Recently,a new opinion was put forward on general design standards for S-scheme heterojunction photocatalyst.Four types of S-scheme heterojunctions were analyzed.Specifically,the critical understanding on the curved Fermi level at the interface of S-scheme heterojunction is helpful to strengthen and promote the basic theory of photocatalysis.

关键词： S-scheme heterojunction p-type semiconductor n-type semiconductor Curved Fermi level

Synergetic N-doped carbon with MoPd alloy for robust oxygen reduction reaction

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Nano Research 2023年第7期16卷 8996-9002页

作者： Chaojie Cen Wenjing Tang Tonghui Zhao Yun Song Yun Yang quanlong xu Wei Chen Zhejiang Key Laboratory of Carbon Materials College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Synergistic catalysis opens up a new venue to improve the comprehensive application of the catalyst.Herein,a composite catalyst(Mo-Pd@N-C)consisting of the N-doped carbon derived from pyrolysis of spherical polypyrrole and MoPd nanoparticles(NPs)was constructed to emphasize the strong metal-support interaction for robust oxygen reduction reaction(ORR).The enhanced anchoring between the MoPd NPs and the substrate,and the N-species formed on the carbon matrix make the Mo-Pd@N-C deliver excellent performance with a half-wave potential of 0.945 V(vs.reversible hydrogen electrode(RHE))for ORR,superior than that of commercial Pt/C(0.86 V).More importantly,it shows a negligible half-wave potential decline(<5 mV)and only~20%of mass activity(MA)attenuation after 30,000 cycles stability test,obviously better than those of Pt/C(~70%of MA attenuation and~30 mV of half-wave potential decline after only 15,000 cycles).This work highlights a novel synergistic method to prolong the life and improve the commercial prospects of the catalysts.

关键词： synergistic catalysis oxygen reduction reaction N-doped carbon MoPd alloy stability

Recent advances in solar-driven CO_(2) reduction over g-C_(3)N_(4)-based photocatalysts

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Carbon Energy 2023年第2期5卷 94-136页

作者： quanlong xu Zhihua Xia Jingmei Zhang Zhiyi Wei Qin Guo Huile Jin Hua Tang Shouzhu Li xuecong Pan Zhi Su Shun Wang College of Chemical and Material Engineering Wenzhou UniversityWenzhouPeople's Republic of China School of Energy and Chemical Engineering Xinjiang Institute of TechnologyAkesuPeople's Republic of China School of Environmental Science and Engineering Qingdao UniversityQingdaoPeople's Republic of China

The persistent increase of CO_(2) levels in the atmosphere,already exceeding 400 ppm,urges the exploration of CO_(2) emission reduction and recycling technologies.Ideally,photocatalytic conversion of CO_(2) into valuable hydrocarbons realizes solar-to-chemical energy conversion,which is a desirable“kill two birds with one stone”strategy;namely,CO_(2) photoreduction can simultaneously tackle energy shortage and keep global carbon balance.Graphitic carbon nitride(g-C_(3)N_(4))working on CO_(2) reduction reaction deserves a highlight not only for the metal-free feature that endows it with low cost,tunable electronic structure,and easy fabrication properties but also because of its strong reduction ability.The present review concisely summarizes the latest advances of g-C_(3)N_(4)-based photocatalysts toward CO_(2) reduction.It starts with the discussion of thermodynamics and dynamics aspects of the CO_(2) reduction process.Then the modification strategies to promote g-C_(3)N_(4)-based photocatalysts in CO_(2) photoreduction have been discussed in detail,including surface functionalization,molecule structure engineering,crystallization,morphology engineering,loading cocatalyst,and constructing heterojunction.Meanwhile,the intrinsic factors affecting CO_(2) reduction activity and selectivity are analyzed and summarized.In the end,the challenges and prospects for the future development of highly g-C_(3)N_(4)-based photocatalysts in CO_(2) reduction are also presented.

关键词： CO_(2)reduction g-C_(3)N_(4) photocatalysis solar-to-fuel conversion

Gd-doped CuBi_(2)O_(4)/CuO heterojunction film photocathodes for photoelectrochemical H_(2)O_(2)production through oxygen reduction

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Nano Research 2021年第10期14卷 3439-3445页

作者： Zixin Li quanlong xu Faliang Gou Bing He Wei Chen Weiwei Zheng xu Jiang Kai Chen Chenze Qi Dekun Ma Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process Shaoxing UniversityShaoxing 312000China Zhejiang Key Laboratory of Carbon Materials Wenzhou UniversityWenzhou 325027China Department of Chemistry Syracuse UniversitySyracuseNew York 13244USA

Photoelectrochemical oxygen reduction reaction(ORR)toward H_(2)O_(2)is highly desirable because only sunlight,O_(2)and water are required in the process.However,the corresponding studies are still at its infancy because of the lack of suitable photocathodes,especially inorganic semiconductor photocathodes.In this work,we report CuBi_(2)O_(4)/CuO(CBO/CuO)heterojunction submicrocrystalline film photocathodes with efficient ORR activity for H_(2)O_(2)production.The heterojunction film photocathodes were prepared through thermal evaporation of Cu and Bi metals under vacuum and subsequent annealing treatment.Furthermore,the doping of Gd^(3+)ions into CBO/CuO could significantly enhance the yield of H_(2)O_(2).As a result,the concentration of H_(2)O_(2)could reach 1.3 mM within 30 min,which is 6 times higher than that obtained on the pristine CBO/CuO photocathode.The theoretical calculations suggested that the introduction of Gd could adjust the electronic structure of CBO surface and promote 2e ORR pathway for selective production of H_(2)O_(2).Our work not only provides a new strategy for designing highly efficient photocathode for H_(2)O_(2)production but also will evoke more interest in photoelectrocatalytic ORR through inorganic semiconductor photocathode.

关键词： CuBi_(2)O_(4) Gd^(3+)ions doping O_(2)reduction reaction H_(2)O_(2)production photoelectrochemical cell

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针刺急救的历史沿革与研究现状

中国急救医学 2024年第3期44卷 268-274页

作者：魏丹丹龙洁吴全龙陈艳焦徐玉东上海中医药大学附属岳阳中西医结合医院上海201203 上海市针灸经络研究所上海200030

针刺疗法不仅可以有效治疗慢性疾病,还可以抢救急危重症疾病,是中国急救医学突出的特色疗法之一。针刺急救穴位少、操作简便、起效迅速,能够为患者争取黄金救治时机,延长生存时间,降低对患者脏器功能损害,并显著提高抢救治愈率。因此,... 详细信息

针刺疗法不仅可以有效治疗慢性疾病,还可以抢救急危重症疾病,是中国急救医学突出的特色疗法之一。针刺急救穴位少、操作简便、起效迅速,能够为患者争取黄金救治时机,延长生存时间,降低对患者脏器功能损害,并显著提高抢救治愈率。因此,在急救工作中推广和使用针刺急救疗法是十分必要的。本文对针刺急救的历史沿革进行了梳理,并对相关临床和实验研究的进展做了归纳和总结,以期为针刺急救的应用以及未来发展提供借鉴和参考。

关键词：针刺急救用穴历史沿革研究现状

Terahertz bound states in the continuum with incident angle robustness induced by a dual period metagrating

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Photonics Research 2022年第3期10卷 810-819页

作者： Wenqiao Shi Jianqiang Gu Xingyuan Zhang Quan xu Jiaguang Han quanlong Yang Longqing Cong Weili Zhang Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin Universityand Key Laboratory of Optoelectronics Information and TechnologyMinistry of EducationTianjin 300072China Nonlinear Physics Centre Australian National UniversityCanberraACT 2601Australia Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Metasurface-empowered bound state in the continuum(BIC)provides a unique route for fascinating functional devices with infinitely high quality factors.This method is particularly attractive to the terahertz community because it may essentially solve the deficiencies in terahertz filters,sensors,lasers,and nonlinear sources.However,most BIC metasurfaces are limited to specified incident angles that seriously dim their application prospects.Here,we propose that a dual-period dielectric metagrating can support multiple families of BICs that originate from guided mode resonances in the dielectric grating and exhibit infinite quality factors at arbitrarily tilted incidence.This robustness was analyzed based on the Bloch theory and verified at tilted incident angles.We also demonstrate that inducing geometric asymmetry is an efficient way to manipulate the leakage and coupling of these BICs,which can mimic the electromagnetically induced transparency(EIT)effect in our dual-period metagrating.In this demonstration,a slow-light effect with a measured group delay of 117 ps was achieved.The incidence-insensitive BICs proposed here may greatly extend the application scenarios of the BIC effect.The high Q factor and outstanding slow-light effect in the metagrating show exciting prospects in realizing high-performance filters,sensors,and modulators for prompting terahertz applications.

关键词： incident dielectric continuum

Moiré-driven electromagnetic responses and magic angles in a sandwiched hyperbolic metasurface

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Photonics Research 2022年第9期10卷 2056-2065页

作者： YI LIU CHUNMEI OUYANG QUAN xu XIAOQIANG SU quanlong YANG JIAJUN MA YANFENG LI ZHEN TIAN JIANQIANG GU LIYUAN LIU JIAGUANG HAN YUNLONG SHI WEILI ZHANG Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information Technology(Ministry of Education of China)Tianjin UniversityTianjin 300072China Institute of Solid State Physics College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsShanxi Datong UniversityDatong 037009China Nonlinear Physics Centre Australian National UniversityCanberraACT 2601Australia School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

Recent moiréconfigurations provide a new platform for tunable and sensitive photonic responses,as their enhanced light–matter interactions originate from the relative displacement or rotation angle in a stacking bilayer or multilayer periodic array.However,previous findings are mostly focused on atomically thin condensed matter,with limitations on the fabrication of multilayer structures and the control of rotation angles.Structured microwave moiréconfigurations are still difficult to realize.Here,we design a novel moiréstructure,which presents unprecedented capability in the manipulation of light–matter interactions.Based on the effective medium theory and S-parameter retrieval process,the rotation matrix is introduced into the dispersion relation to analyze the underlying physical mechanism,where the permittivity tensor transforms from a diagonal matrix to a fully populated one,whereas the permeability tensor evolves from a unit matrix to a diagonal one and finally becomes fully filled,so that the electromagnetic responses change drastically as a result of stacking and rotation.Besides,the experiment and simulation results reveal hybridization of eigenmodes,drastic manipulation of surface states,and magic angle properties by controlling the mutual rotation angles between two isolated layers.Here,not only a more precisely controllable bilayer hyperbolic metasurface is introduced to moiréphysics,the findings also open up a new avenue to realize flat bands at arbitrary frequencies,which shows great potential in active engineering of surface waves and designing multifunctional plasmonic devices.

关键词： rotation hyperbolic diagonal

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Z型光催化体系中存在的电荷转移机理问题

物理化学学报 2023年第6期39卷 1-3页

作者：徐全龙赫荣安李佑稷温州大学化学与材料工程学院浙江温州325027 长沙学院环境光催化应用技术湖南省重点实验室长沙410022 吉首大学化学化工学院湖南吉首416000

Photocatalysis is a sunrise technology with great potential for hydrogen production 1,2,carbon dioxide reduction 3,and so on.However,a single-component photocatalyst often exhibits severely limited activity due to rap... 详细信息

关键词：电荷转移光催化体系机理问题