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Controllable oxygen vacancies and morphology engineering:Ultra-high HER/OER activity under base–acid conditions and outstanding antibacterial properties

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Journal of Energy Chemistry 2022年第8期31卷 639-651,I0017页

作者： Hongyao Xue Alan Meng Tongqing Yang Zhenjiang Li Chunjun Chen College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061ShandongChina Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266061ShandongChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of Sciences 2Beijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBejing 100049China

Introducing vacancy defects and unique morphology is an effective strategy to improve the catalytic performance of transition metal compounds.However,precisely controlling the amount of vacancy defects remains challenging.Here,we propose a facile and efficient hydrothermal accompanying an annealing method to synthesize a series of Mn-doped CoO nanomaterials with controllable oxygen vacancies and unique morphology.The oxygen vacancies amount can be precisely controlled by adjusting the Mndoping content and is positively correlated with catalytic performance.It was found that the oxygen vacancies amount can reach up to 38.2%over the Mn-doped CoO nanomaterials,resulting in ultra-high hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)catalytic activity(HER:25.6 and 37 m V at 10 m A cm^(-2);OER:301 and 322 m V at 50 m A cm^(-2))under both basic and acidic conditions,while reaching 10 m A cm^(-2) for an ultra-low cell voltage of only 1.52 V,which exceeds that of Pt/C/RuO_(2) and all reported non-noble metal oxide catalysts.The DFT calculations reveal oxygen vacancies can optimize H*and HOO*intermediates adsorption free energy,thus improving the HER and OER performance.Interestingly,the Mn-doped CoO with rich oxygen vacancies exhibits excellent antibacterial properties in vitro of biomedicine.This work provides new ideas and methods for the rational design and precise control of vacancy defects in transition metal compounds and explores their potential application value in electrochemical water splitting and biomedical fields.

关键词： Oxygen vacancies Mn-doping HER OER Antibacterial

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Boosted electromagnetic wave absorption performance from synergistic induced polarization of SiC_(NWs)@MnO_(2)@PPy heterostructures

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Nano Research 2023年第2期16卷 3558-3569页

作者： meng Zhang Laibin Zhao Wenxin Zhao Ting Wang Liying Yuan Yuying Guo Yuxin Xie Tingting Cheng Alan Meng Zhenjiang Li College of Electromechanical Engineering Key Laboratory of Polymer Material Advanced Manufacturing’s Technology of Shandong provinceCollege of Materials Science and EngineeringQingdao University of Science and TechnologyQingdao 266061China Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOEShandong Key Laboratory of Biochemical AnalysisCollege of Gaomi CampusCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China

In the last decade,electromagnetic pollution has caused people’s considerable attention.Developing absorbing material with low cost,lightweight,simple preparation,and high electromagnetic attenuation efficiency has become a feasible means to deal with this problem.In this work,core–shell SiC_(NWs)@MnO_(2)@PPy(NWs:nanowires,PPy:polypyrrole)heterostructures composed of SiC nanowires core,MnO_(2)nanosheets inter-layer,and PPy coating were successfully prepared through chemical vapor deposition and two-step electrodeposition process.Taking advantage of the interfacial polarization and dipole polarization,the obtained product displays excellent electromagnetic wave absorption performances with the minimum reflection loss(RLmin)of−50.59 dB when the matching thickness is 2.41 mm,and the optimal effective absorption bandwidth(EAB)value reaches to 6.64 GHz at a matching thickness of 2.46 mm,revealing that the SiC_(NWs)@MnO_(2)@PPy nanocomposite could be served as a promising electromagnetic wave absorbing material.On the basis of systematic analysis concerning the electromagnetic parameters,the dissipation process of the incident electromagnetic wave was demonstrated reasonably,which may provide a referable preparation strategy for novel heterostructures,especially nonmagnetic lightweight absorbing material.

关键词： SiC nanowires heterostructure polarization loss electromagnetic wave absorption attenuation mechanism

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Monodispersed Co@C nanoparticles anchored on reclaimed carbon black toward high-performance electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第29期124卷 182-192页

作者： Zhenjiang Li Hui Lin Yuxin Xie Laibin Zhao Yuying Guo Tingting Cheng Hailong Ling Alan Meng Shaoxiang Li meng Zhang College of Materials Science and Engineering College of Electromechanical EngineeringQingdao University of Science and TechnologyQingdao 266061China State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection Shandong Engineering Technology Research Center for Advanced CoatingCollege of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

Recently,developing carbon-based hybrid materials loaded with magnetic components has been generally regarded as a promising and practically feasible strategy when it comes to constructing lightweight electromagnetic wave absorbers.In the current work,reclaimed carbon black(CB)nanopowder was firstly produced by simple burning of wheat straw,which was then employed as sustainable carbon-based host materials(carrier)and successfully decorated Co@C nanoparticles via a simple thermal reduction process.Remarkably,both the as-fabricated nanocomposites and corresponding electromagnetic wave absorption performances could be effectively tuned by tailoring the dosage of the Co@C nanoparticles.The minimum reflection loss(RLmin)of–53.989 d B was achieved for CB/Co@C-2#at 2.28 mm thickness,meanwhile,CB/Co@C-3#was featured by a wide effective absorption band(EAB)of 6 GHz(6.72–12.72 GHz)at a 2.73 mm matching thickness,which covered the entire X band,suggesting that the CB/Co@C nanocomposites were an attractive candidate for electromagnetic wave absorber.According to the synergistic influence of dielectric loss and magnetic loss from CB and Co@C,respectively,as well as the properly matched impedance,a reasonable electromagnetic wave attenuation mechanism was illustrated.It is noteworthy that the preparation process of CB is a facile,recycled,and low-cost strategy for achieving nanoscale carbon-based absorbing materials,moreover,the CB/Co@C nanocomposites provide a reference for constructing lightweight dielectric-magnetic products with superb electromagnetic wave absorption performances.

关键词： Reclaimed carbon black Microwave absorption Attenuation mechanism Preparation technique CB/Co@C nanocomposites

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Youheng Tang,the pioneering founder of South China Agricultural University

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Protein & Cell 2022年第3期13卷 157-162页

作者： Yuan Chen alan WAdame Ge-Zhi Chen Yuanyuan meng South China Agricultural University Guangzhou 510642China Shenzhen Middle School International Department Shenzhen 518001China Beijing Institutes of Life Science Chinese Academy of SciencesBeijing 100101China

Living during the eve of the Qing Dynasty,Youheng Tang(唐有恒)was a pioneer of agricultural education and agronomy research in China.He sought neither money nor vanity,only to fulfill his deep-seated dream to benefit the nation.In addition to being a Chinese agricultural educator,agricultural sciences scholar,and modern agricultural science and education entrepreneur in Guangdong Province,Youheng Tang was also the founder of South China Agricultural University(Fig.1).

关键词： Agricultural education money

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Enhancing electromagnetic wave absorption in carbon fiber using FeS_(2)nanoparticles

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Nano Research 2023年第7期16卷 9591-9601页

作者： Yuying Guo meng Zhang Tingting Cheng Yuxin Xie Laibin Zhao Liang Jiang Wenxin Zhao Liying Yuan Alan Meng Jian Zhang Ting Wang Zhenjiang Li College of Electromechanical Engineering Key Laboratory of Polymer Material Advanced Manufacturing’s Technology of Shandong provinceCollege of Materials Science and EngineeringQingdao University of Science and TechnologyQingdao 266061China College of Chemical Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOEShandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Textiles and Clothing Qingdao UniversityQingdao 266071China

Carbon-based electromagnetic wave absorbing materials(absorbers)adhered with metallic sulfide nanoparticles of good electrical conductivity attract increasing researchers’attention.In this study,on the basis of carbon fiber(C_(f))@Fe_(3)O_(4) nanocomposites obtained by the electrostatic spinning and reflow method,C_(f)@FeS_(2)nanocomposite was successfully prepared during a further hydrothermal process.The products exhibit excellent electromagnetic wave absorption performances with a minimum reflection loss(RLmin)of-54.11 dB at 2.13 mm matching thickness.At the same time,the optimal effective absorption bandwidth(EAB)value of 6.04 GHz at a thickness of 1.98 mm covers the whole Ku band,suggesting its excellent electromagnetic wave absorption performances.In addition,the interlaced network structure constructed by carbon fiber,outstanding conductivity of FeS_(2)nanoparticles,and interfacial polarization from hetero-structure play significant parts in enhancing the electromagnetic parameters and absorption performances.All these results suggest that the C_(f)@FeS_(2)nanocomposites can be taken as a new electromagnetic wave-absorbing material under their low density,simple craft,and strong absorption characteristics.

关键词： constructed network structure carbon fiber(C_(f))@FeS_(2)nanocomposite enhanced dielectric loss microwave attenuation mechanism

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An Equivalent Substitute Strategy for Constructing 3D Ordered Porous Carbon Foams and Their Electromagnetic Attenuation Mechanism

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Nano-Micro Letters 2022年第10期14卷 15-35页

作者： meng Zhang Hailong Ling Ting Wang Yingjing Jiang Guanying Song Wen Zhao Laibin Zhao Tingting Cheng Yuxin Xie Yuying Guo Wenxin Zhao Liying Yuan Alan Meng Zhenjiang Li College of Materials Science and Engineering College of Electromechanical EngineeringQingdao University of Science and TechnologyQingdao 266061People’s Republic of China State Key Laboratory Base of Eco-Chemical Engineering College of Chemistry and Molecular EngineeringCollege of Chemical Engineering in Gaomi CampusQingdao University of Science and TechnologyQingdao 266042People’s Republic of China

Three-dimensional(3D)ordered porous carbon is generally believed to be a promising electromagnetic wave(EMW)absorbing material.However,most research works targeted performance improvement of 3D ordered porous carbon,and the specific attenuation mechanism is still ambiguous.Therefore,in this work,a novel ultra-light egg-derived porous carbon foam(EDCF)structure has been successfully constructed by a simple carbonization combined with the silica microsphere template-etching process.Based on an equivalent substitute strategy,the influence of pore volume and specific surface area on the electromagnetic parameters and EMW absorption properties of the EDCF products was confirmed respectively by adjusting the addition content and diameter of silica microspheres.As a primary attenuation mode,the dielectric loss originates from the comprehensive effect of conduction loss and polarization loss in S-band and C band,and the value is dominated by polarization loss in X band and Ku band,which is obviously greater than that of conduction loss.Furthermore,in all samples,the largest effective absorption bandwidth of EDCF-3 is 7.12 GHz under the thickness of 2.13 mm with the filling content of approximately 5 wt%,covering the whole Ku band.Meanwhile,the EDCF-7 sample with optimized pore volume and specific surface area achieves minimum reflection loss(RL_(min))of−58.08 dB at 16.86 GHz while the thickness is 1.27 mm.The outstanding research results not only provide a novel insight into enhancement of EMW absorption properties but also clarify the dominant dissipation mechanism for the porous carbon-based absorber from the perspective of objective experiments.

关键词： Porous carbon foam Electromagnetic wave absorption Adjustable pore structure Polarization loss Attenuation mechanism

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Intercalation-deintercalation design in MXenes for high-performance supercapacitors

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Nano Research 2022年第4期15卷 3213-3221页

作者： Zhenjiang Li Jun Dai Yiran Li Changlong Sun Alan Meng Renfei Cheng Jian Zhao Minmin Hu Xiaohui Wang School of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266061China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

MXene is a new intercalation pseudocapacitive electrode material for supercapacitor application.Intensifying fast ion diffusion is significantly essential for MXene to achieve excellent electrochemical performance.The expansion of interlayer void by traditional spontaneous species intercalation always leads to a slight increase in capacitance due to the existence of species sacrificing the smooth diffusion of electrolyte ions.Herein,an effective intercalation-deintercalation interlayer design strategy is proposed to help MXene achieve higher capacitance.Electrochemical cation intercalation leads to the expansion of interlayer space.After electrochemical cation extraction,intercalated cations are deintercalated mostly,leaving a small number of cations trapped in the interlayer silt and serving as pillars to maintain the interlayer space,offering an open,unobstructed interlayer space for better ion migration and storage.Also,a preferred surface with more-O terminations for redox reaction is created due to the reaction between cations and-OH terminations.As a result,the processed MXene delivers a much improved capacitance compared to that of the original Ti_(3)C_(2)T_(x)electrode(T stands for the surface termination groups,such as-OH,-F,and-O).This study demonstrates an improvement of electrochemical performance of MXene electrodes by controlling the interlayer structure and surface chemistry.

关键词： MXene electrochemical ion intercalation−deintercalation interlayer design supercapacitor energy storage

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Atomic insights of electronic states engineering of GaN nanowires by Cu cation substitution for highly efficient lithium ion battery

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Journal of Energy Chemistry 2022年第4期31卷 46-54页

作者： Zhenjiang Li Kesheng Gao Ying Han Shiqi Ding Yanglansen Cui Minmin Hu Jian Zhao meng Zhang Alan Meng Jimmy Yun Zhiming Liu Da-Wei Wang Changlong Sun College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina School of Chemical Engineering The University of New South WalesSydneyNSW 2052Australia Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials College of Electromechanical EngineeringQingdao University of Science and TechnologyQingdao 266061ShandongChina Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao International Academician Park Research Institute QingdaoShandong 266000China School of Materials Science and Engineering Beihang University100191 BeijingChina School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Electronic engineering of gallium nitride(Ga N) is critical for enhancement of its electrode performance.In this work, copper(Cu) cation substituted Ga N(Cu-Ga N) nanowires were fabricated to understand the electronically engineered electrochemical performance for Li ion storage. Cu cation substitution was revealed at atomic level by combination of X-ray photoelectron spectroscopy(XPS), X-ray absorption fine structure(XAFS), density functional theory(DFT) simulation, and so forth. The Cu-Ga N electrode delivered high capacity of 813.2 m A h g^(-1) at 0.1 A g^(-1) after 200 cycles, increased by 66% relative to the unsubstituted Ga N electrode. After 2000 cycles at 10 A g^(-1),the reversible capacity was still maintained at326.7 m A h g^(-1). The DFT calculations revealed that Cu substitution introduced the impurity electronic states and efficient interatomic electron migration, which can enhance the charge transfer efficiency and reduce the Li ion adsorption energy on the Cu-Ga N electrode. The ex-situ SEM, TEM, HRTEM, and SAED analyses demonstrated the reversible intercalation Li ion storage mechanism and good structural stability. The concept of atomic-arrangement-assisted electronic engineering strategy is anticipated to open up opportunities for advanced energy storage applications.

关键词： Cu cation substitution Electronic states engineering GaN nanowires Lithium-ion batteries DFT

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Insight into the synergistic effect of defect and strong interface coupling on ZnIn_(2)S_(4)/CoIn_(2)S_(4)heterostructure for boosting photocatalytic H_(2) evolution

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Journal of Energy Chemistry 2024年第5期92卷 151-161页

作者： Xuehua Wang Tianyu Shi Xianghu Wang Aili Song Guicun Li Lei Wang Jianfeng Huang Alan Meng Zhenjiang Li College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOECollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Huanghai University Qingdao 266000ShandongChina School of Material Science and Engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi’an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina

Steering the directional carrier migration across the interface is a central mission for efficient photocatalytic reactions.In this work,an atomic-shared heterointerface is constructed between the defect-rich ZnIn_(2)S_(4)(HVs-ZIS)and CoIn_(2)S_(4)(CIS)via a defect-guided heteroepitaxial growth strategy.The strong interface coupling induces adequate carriers exchanging passageway between HVs-ZIS and CIS,enhancing the internal electric field(IEF)in the ZnIn_(2)S_(4)/CoIn_(2)S_(4)(HVs-ZIS/CIS)heterostructure.The defect structure in HVs-ZIS induces an additional defect level,improving the separation efficiency of photocarriers.Moreover,promoted by the IEF and intimate heterointerface,photogenerated electrons trapped by the defect level can migrate to the valence band of CIS,contributing to massive photogenerated electrons with intense reducibility in HVs-ZIS/CIS.Consequently,the HVs-ZIS/CIS heterostructure performs a boosted H_(2)evolution activity of 33.65 mmol g^(-1)h^(-1).This work highlights the synergistic effects of defect and strong interface coupling in regulating carrier transfer and paves a brave avenue for constructing efficient heterostructure photocatalysts.

关键词： Defect-guided heteroepitaxial growth Heterointerface coupling Photocatalytic H_(2)evolution Mechanism HVs-ZIS/CIS

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Surface reconstruction,doping and vacancy engineering to improve the overall water splitting of CoP nanoarrays

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Nano Research 2023年第1期16卷 228-238页

作者： Yongkai Sun Wenyuan Sun Lihong Chen Alan Meng Guicun Li Lei Wang Jianfeng Huang Aili Song Zhenhui Zhang Zhenjiang Li College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOE College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China School of Material Science and Engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi’an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi’an 710021China Qingdao Huanghai University Qingdao 266000China

Development of a general regulatory strategy for efficient overall water splitting remains a challenging task.Herein,a simple,costfairness,and general fluorination strategy is developed to realize surface reconstruction,heteroatom doping,and vacancies engineering over cobalt phosphide(CoP)for acquiring high-performance bifunctional electrocatalysts.Specifically,the surface of CoP nanoarrays(NAs)becomes rougher,meanwhile F doped into CoP lattice and creating amounts of P vacancies by fluorination,which caused the increase of active sites and regulation of charge distribution,resulting the excellent electrocatalyst performance of F-CoP NAs/copper foam(CF).The optimized F-CoP NAs/CF delivers a lower overpotential of only 35 mV at 10 mA·cm^(−2)for hydrogen evolution reaction(HER)and 231 mV at 50 mA·cm^(−2)for oxygen evolution reaction(OER),and the corresponding overall water splitting requires only 1.48 V cell voltage at 10 mA·cm^(−2),which are superior to the most state-of-theart reported electrocatalysts.This work provides an innovative and feasible strategy to construct efficient electrocatalysts.

关键词： fluorination surface reconstruction F atom doping P vacancies overall water splitting

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