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Chinese Journal of Chemistry 2024年第9期42卷 973-979页

作者： ziwei deng Zhiyi Sun Yaqiong Li Jiajing Pei Wenxing Chen Energy&Catalysis Center Schoolof Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 00049China

Energy transformation is imminent,and hydrogen energy is one of the important new energy *** of the keys to increasing the rate of hydrogen evolution during electrolysis is the use of high-performance catalysts for oxygen evolution reactions(OER).Single-atom alloys(SAAs)have garnered significant attention because they partially reduce costs and combine the advantages of both single-atom catalysts(SACs)and alloy ***,an efficient pyrolysis strategy based on a mixing and drying process is designed to anchor ultra-small Co cluster particles,combined with Ru single atoms dispersed on nitrogen-doped ultra-thin carbon nanosheets(Ru_(1)Co SAA/NC).The prepared electrocatalyst exhibits superior OER activity and superb stability,demonstrating an overpotential of 238 mV for OER with a current density of 10 mA·cm^(-2) in 0.5 mol/L H_(2)SO_(4).And we also utilized in-situ XAS to detect the oxidation state of Ru sites during *** in all,this method achieves cost reductions and efficiency improvements through the design of SAAs,offering new prospects for the structural transformation of clean energy.

关键词： Oxygen evolution reaction Single alloy catalyst Ultra-thin carbon nanosheets Electrocatalyst Pyrolysis RuiCo SAA/NC

Electrocatalytic organic transformation reactions in green chemistry: Exploring nanocrystals and single atom catalysts

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Nano Research 2024年第11期17卷 9326-9344页

作者： ziwei deng Yuexin Guo Zhiyi Sun Jie Lin Huazhang Zhai Wenxing Chen School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China School of pharmacy North China University of Science and Technology Tangshan 063210 China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Beijing Institute of Technology Beijing 100081 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Science Ningbo 315201 China

Organic synthesis chemistry plays a crucial role in supporting social sustainable development and finds widespread applications across various fields. Electrocatalysis, with its benefits of high efficiency, mild reaction conditions, controllability, and environmental friendliness, stands out as one of the most effective strategies for driving the transformation of organic substrates. In recent years, nanocrystals (NCs) and single atom catalysts (SACs) have garnered significant attention in the realm of electrocatalytic organic transformation. This article presents a comprehensive overview of the applications of NCs and SACs in electrocatalytic organic transformation. It delves into advanced catalysts for electrocatalysis of representative substrates, covering both anodic oxidation and cathodic reduction aspects, and addresses their synthesis, characterization, catalytic mechanism, and performance. The ultimate goal of this review is to serve as a valuable reference and a source of inspiration for further exploration into the development of more effective catalysts for electrocatalytic organic transformation.

关键词： single atom catalysts nanocrystals electrocatalysis organic transformation

Synergy enhancement of Co single atoms and asymmetric subnanoclusters for Fenton-like activation

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Nano Research 2024年第9期17卷 7935-7944页

作者： Ming Ma Zhiyi Sun ziwei deng Xiang Li Fang Zhang Wenxing Chen School of Materials Key Laboratory of Cluster Science Ministry of EducationBeijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technologies Research Institute(Jinan)Advanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Energy and Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Analysis and Testing Center Beijing Institute of TechnologyBeijing Institute of TechnologyBeijing 100081China

As a new water treatment technology,Fenton-like reaction has great *** this study,we successfully prepared an excellent Fenton-like catalyst,which is composed of cobalt monoatoms and asymmetric subnanoclusters(labeled CoSA/Clu-C_(2)N),and exhibits excellent peroxymonosulfate(PMS)activation *** directly comparing the catalytic properties of CoSA-C_(2)N and CoSA/Clu-C_(2)N,the synergistic effects of coasymmetric Co subclusters and Co atoms on the activation of PMS and degradation of organic micropollutants were *** results showed that CoSA/Clu-C_(2)N had higher degradation rates of carbamazepine(CBZ),antipyrine(AT)and chlorobenzoic acid(CA)when combined with active oxidant *** cyclic frequency of CBZ was 5.4 min^(-1),which was twice as high as the catalytic constant of CoSA-C_(2)N(2.4 min^(-1)).The results show that CoSA/Clu-C_(2)N cobalt subnanoclusters and cobalt single atom can synergistically improve the catalytic performance of activated PMS oxidation of micropollutants in *** addition,electron paramagnetic resonance(EPR)technology has proved that the introduction of Co subnano clusters in CoSA/Clu-C_(2)N is conducive to the production of singlet oxygen(1O_(2)),thereby improving the efficiency of pollutant *** work lays a solid foundation for the future design of advanced multifunctional catalysts by carefully regulating and combining monmetallic atoms and metal subnanoclusters.

关键词： carbamazepine Fenton-like reaction Co single atoms asymmetrical sub-nanoclusters peroxymonosulfate synergy enhancement

Ultrasonication-assisted and gram-scale synthesis of Co-LDH nanosheet aggregates for oxygen evolution reaction

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Nano Research 2020年第1期13卷 79-85页

作者： Tian-Jiao Wang Xiaoyang Liu Ying Li Fumin Li ziwei deng Yu Chen Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education) Key Laboratory of Macromolecular Science of Shaanxi ProvinceShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an710062China School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi’an710062China

Electrochemical water splitting(EWS)is a highly clean and efficient method for high-purity hydrogen ***,EWS suffers from the sluggish and complex oxygen evolution reaction(OER)kinetics at *** present,the efficient,stable,and low-cost non-precious metal based OER electrocatalyst is still a great and long-term challenge for the future industrial application of EWS ***,we develop a simple and fast approach for gram-scale synthesis of flower-like cobalt-based layered double hydroxides nanosheet aggregates by ultrasonic synthesis,which show outstanding electrocatalytic performance for the oxygen evolution reaction in alkaline media,such as preeminent stability,small overpotential of 300 mV at 10 mA·cm^−2 and small Tafel slope of 110 mV·dec^−1.

关键词： electrochemical water splitting oxygen evolution reaction gram-scale synthesis layered double hydroxides nanosheet aggregates

Multi-Objective Optimal Design of the Wind-Wave Hybrid Platform with the Coupling Interaction

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Journal of Ocean University of China 2023年第5期22卷 1165-1180页

作者： deng ziwei ZHANG Baocheng MIAO Yu ZHAO Bo WANG Qiang ZHANG Kaisheng Department of Mechatronic Engineering College of EngineeringOcean University of ChinaQingdao 266100China Key Laboratory of Ocean Engineering of Shandong Province Ocean University of ChinaQingdao 266100China

An offshore wind-wave hybrid platform could consistently and cost-effectively supply renewable power.A multi-objective optimization process is proposed for a hybrid platform with hydrodynamic coupling *** effects of various critical structural parameters,spacing values,and wave directions are studied for higher energy capture and offshore platform *** models of various key parameters are established to optimize the hybrid system,with the objects of the power capture width ratio and the stability index of the *** optimization results are affected by the hydrodynamic coupling interaction,with a tendency to affect the higher frequency of hydrodynamic performance in the hybrid *** the optimization,an appropriate spacing value effectively improves energy capture *** optimal array distance D_(Ff),D_(Fp),the optimal structural parameters R_(p),r_(p),d_(f),r_(f),and B_(PTO)are 11.57,12.75,5.1,3.3,1.5,6.5 m,and 80436 Nm s^(-1),*** peak value of the wave energy converter capture width ratio in the hybrid system increases by almost 50%,with a 54%decrease in the stability index.

关键词： wind and wave energy hydrodynamic interaction optimization

New RF trip diagnostic system of BEPCII

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Radiation Detection Technology and Methods 2021年第4期5卷 594-599页

作者： ziwei deng Qunyao Wang Haiyin Lin Pei Zhang Jianping Dai Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Background The upgrade project of the Beijing Electron Positron Collider(BEPCII)is a high-current electron–positron collider with beam intensity close to *** RF system plays an important role in providing energy for the beam,compressing the beam length and maintaining beam *** the RF system shuts down the RF power for various reasons,the accelerator will stop *** In order to determine which reason causes the RF trip,a new RF trip diagnostic system was built based on the NI PXI *** The new RF trip diagnostic system is used to collect the data of the forward power,reflected power,cavity voltage,and beam current in a period of time before and after the RF trip event *** system uses LabVIEW as the control software,which conducts I/Q sampling of down-converted RF signals directly,then calculates the amplitude and phase of each RF signal,and plots the change *** data and figures are stored in the disk and MySQL *** change curve can be replotted by the data browser which developed by the Python or PHP *** Through the analysis of the RF trip data and figures that produced by the new RF trip system,it can be clear whether the RF trip is caused by the RF system,so as to locate the reason of the RF trip more quickly and improve the reliability and stability of the machine operation.

关键词： RF system RF trip diagnostic system Data acquisition LabVIEW

Aggregation-induced emission biomaterials for anti-pathogen medical applications:detecting,imaging and killing

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Regenerative Biomaterials 2023年第1期10卷 1003-1020页

作者： Zicong Zhang ziwei deng Lixun Zhu Jialin Zeng Xu Min Cai Zijie Qiu Zheng Zhao Ben Zhong Tang Clinical Translational Research Center of Aggregation-Induced Emission The Second Affiliated HospitalSchool of MedicineSchool of Science and EngineeringShenzhen Key Laboratory of Functional Aggregate MaterialsThe Chinese University of Hong KongShenzhenGuangdong 518172China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Rescources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China HKUST-Shenzhen Research Institute South Area Hi-Tech ParkNanshanShenzhenGuangdong Province 518057China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Microbial pathogens,including bacteria,fungi and viruses,greatly threaten the global public *** pathogen infections,early diagnosis and precise treatment are essential to cut the mortality *** emergence of aggregation‐induced emission(AIE)biomaterials provides an effective and promising tool for the theranostics of pathogen *** this review,the recent advances about AIE biomaterials for anti-pathogen theranostics are *** the excellent sensitivity and photostability,AIE biomaterials have been widely applied for precise diagnosis of ***,different types of anti-pathogen methods based on AIE biomaterials will be presented in detail,including chemotherapy and ***,the existing deficiencies and future development of AIE biomaterials for anti-pathogen applications will be discussed.

关键词： aggregation-induced emission fluorescence imaging pathogen differentiation pathogen inactivation

Improving the RF stabilities of BEPCII by a disturbance observer based controller

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Radiation Detection Technology and Methods 2021年第2期5卷 220-227页

作者： Qunyao Wang Jianping Dai Haiyin Lin Zhenghui Mi Yi Sun ziwei deng Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Background A digital low level radio frequency(DLLRF)system has been developed to replace the old analog LLRF and operated stably at BEPCII east RF station in the past two *** RF stabilities required for BEPCII are±1%in magnitude and±1 degree in *** are satisfied both by the new DLLRF and the old analog ***,the DLLRF did not improve the RF stabilities so much as expected,especially when the beam current was high in collision *** The purpose is to improve the RF stabilities further and meet the requirements by the upgraded BEPCII project(BEPC3).Method A disturbance observer based(DOB)controller to suppress the noise was developed and tested with beam at BEPCII RF *** The DOB controller works and the RF stabilities with beam may be improved from±1%to less than±0.5%in magnitude and from±1 degree to less than±0.5 degrees in phase.

关键词： RF stability Digital low-level RF(DLLRF) Disturbance-observer-based(DOB)controller

Development of a 500-MHz waveguide directional coupler with high directivity for HEPS

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Radiation Detection Technology and Methods 2022年第3期6卷 323-329页

作者： Yuanli Luo Jian Li Pei Zhang Qiang Ma Haiying Lin Tongming Huang Fanbo Meng Facheng Zhao ziwei deng Institute of High Energy Physics(IHEP) Chinese Academy of Sciences(CAS)Beijing 100049China School of Nuclear Sciences and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology IHEPCASBeijing 100049China

Purpose In order to achieve a high-precision measurement of the incident and the reﬂected power,a WR1800 rectangular waveguide directional coupler with high directivity and high power level has been in-house *** couplers will be installed in the 500-MHz high-power radio-frequency transmission lines delivering 200-kW continuous-wave power for the High Energy Photon Source(HEPS).Methods The directional coupler adopts the design scheme of primary and secondary transmission lines and coaxial coupling-head *** shape and dimensional parameters of the coupling head were carefully optimized by using microwave simulation *** optimum directivity of 64 dB was achieved in *** and conclusions A prototype coupler was subsequently manufactured,and its directivity was measured to be 48.2 dB following a rigorous calibration procedure,largely exceeding the design goal and the commercial *** coupler was then connected to an existing 500-MHz klystron system,and a high-power test with short-circuit termination was *** high directivity of the coupler was conﬁrmed up to 200 *** the 6 hours of power aging with continuous-wave 200 kW in a standing-wave setup,no performance degradation was observed on the *** coupler temperature was measured to be 20◦C above the ambient *** design requirements were comfortably fulﬁ*** constitute theﬁrst in-house development of a large-size waveguide directional coupler with high directivity and high power level for *** design,fabrication,and performance tests of the directional coupler are presented.

关键词： Directional coupler High directivity Simulation optimization High-power RF High Energy Photon Source

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仿贻贝黏附性多巴胺的研究与应用进展

高分子材料科学与工程 2015年第1期31卷 185-190页

作者：李珍妮邓字巍陕西师范大学材料科学与工程学院陕西西安710062

海洋贻贝类生物通过足丝分泌的黏附蛋白,具有高强度、高韧性、防水性以及极强黏附性等特点,可以使其黏附在几乎所有基底材料上。大量研究表明,3,4-二羟基-L-苯基丙氨酸(多巴,DOPA)是海洋贻贝类生物分泌的相关黏附蛋白中的重要组成部分... 详细信息

海洋贻贝类生物通过足丝分泌的黏附蛋白,具有高强度、高韧性、防水性以及极强黏附性等特点,可以使其黏附在几乎所有基底材料上。大量研究表明,3,4-二羟基-L-苯基丙氨酸(多巴,DOPA)是海洋贻贝类生物分泌的相关黏附蛋白中的重要组成部分。而且,贻贝黏附蛋白所具有的这种超强黏附能力,主要与多巴中特有的分子结构以及其与基底材料的相互作用方式等相关。多巴胺作为多巴衍生物的重要成员,具有与多巴相似的结构和性质,同样可以实现对基材表面的黏附,因而引起了研究人员的极大关注。本文综述了多巴胺的结构、性质、聚合机理以及它们在材料学、仿生学、生物医学等不同领域的应用现状。

关键词：多巴胺黏附性表面修饰生物矿化应用