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Photocatalytic nonoxidative coupling of methane to ethylene over carbon-doped ZnO/Au catalysts

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Science China Chemistry 2023年第11期66卷 3252-3261页

作者： Jing Wang yuhao peng Wei Xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China

A photocatalytic nonoxidative coupling of methane to multi-carbon compounds remains a huge challenge due to its high dissociation energy of C–H bonds and sluggish charge carrier ***-modified carbon-doped ZnO(C-ZnO/Au)photocatalyst is constructed by an interfacial modification-assisted self-assembly approach for efficient photocatalytic nonoxidative coupling of methane to ethylene and hydrogen(2CH_4=C_2H_4+2H_2).Benefitting from the presence of C-ZnO/Au interfaces,the catalyst not only weakens the excitonic confinement to improve the photogenerated charge carrier separation,but also enhances the stability of lattice oxygen to suppress C_2H_4 ***,this hybrid catalyst also accelerates the generation of Zn~+–O~–pairs to activate C–H bonds,stabilizes the important reaction intermediate(*OCH_3)to achieve the C–C coupling,and promotes the generation of low-valence Zn to accelerate the dehydrogenation of the*OC_2H_5 into C_2H_***,a stable photocatalytic methane conversion performance can be achieved over C-ZnO/Au heterojunctions with a stoichiometric generation of the oxidation product(C_2H_4,45.85μmol g~(-1)h~(-1))and reduction product(H_2,88.07μmol g~(-1)h~(-1)).This work provides deep insights into the elemental doping and oxide/Au interfaces for the enhanced photocatalytic activity and product selectivity under mild conditions in the absence of extra oxidants.

关键词： carbon-doped ZnO charge separation C–H bond activation photocatalytic nonoxidative coupling of methane

Sulfur-doped CMK-5 with expanded lattice for high-performance lithium ion batteries

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Chinese Chemical Letters 2023年第7期34卷 279-283页

作者： Zhenjin Liang yuhao peng Xing Zhang Kewei Cao Wei Xiao Dong Gu The Institute for Advanced Studies Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China

Heteroatom-doped porous carbon materials are very attractive for lithium ion batteries(LIBs) owing to their high specific surface areas, open pore structures, and abundant active sites. However, heteroatomdoped porous carbon with very high surface area and large pore volume are highly desirable but still remain a big challenge. Herein, we reported a sulfur-doped mesoporous carbon(CMK-5-S) with nanotubes array structure, ultrahigh specific surface area(1390 m^(2)/g), large pore volume(1.8 cm^(3)/g), bimodal pore size distribution(2.9 and 4.6 nm), and high sulfur content(2.5 at%). The CMK-5-S used as an anode material for LIBs displays high specific capacity, excellent rate capability and highly cycling stability. The initial reversible specific capacity at 0.1 A/g is as high as 1580 mAh/g and simultaneously up to 701 mAh/g at 1A/g even after 500 cycles. Further analysis reveals that the excellent electrochemical storage performances is attributed to its unique structures as well as the expanded lattice by sulfur-doping.

关键词： Mesoporous material CMK-5 Hollow structure Sulfur-doping Lithium ion batteries

Modulation of Excitonic Confinement of TiO_(2)in Molten Salts for Overall CO_(2)Photoreduction

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Chinese Journal of Chemistry 2023年第10期41卷 1185-1190页

作者： Jing Wang Ren Sheng Dong Gu yuhao peng Juanxiu Xiao Yijun Shen Wei Xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhanHubei 430072China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikouHainan

Excitonic confinement greatly determines the charge carrier transport of photocatalysts.A molten salt modulation of excitonic con-finement is herein demonstrated as formation of ultrafine carbon-doped anatase TiO_(2)with grafted graphitic carbon nitride,which is rationalized as an excellent catalyst for overall CO_(2)*** with bulk TiO_(2),the carbon-doped TiO_(2)(M-TiO_(2))pos-sesses a weaker excitonic confinement to decrease exciton binding energy from 99 to 58 meV,consequently enhancing free-charge-carrier generation and *** Z-scheme electron transfer from M-TiO_(2)to C_(3)N_(4) is built,enhancing the CO_(2)conversion via the synchronous optimization of redox ability,CO_(2)activation,and^(*)COOH *** work highlights the unique chemistry of excitonic dissociation on facilitating separation of electron and hole,and also extends the scope of molten salt-mediated modulation of photocatalysis materials.

关键词： Molten salt CO_(2)reduction Photocatalysis Excitonic confinement Charge transfer

Piezoelectrically Mediated Reactions:From Catalytic Reactions to Organic Transformations

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Chinese Journal of Chemistry 2023年第1期41卷 111-128页

作者： Ziye Ren yuhao peng Hanliang He Chengqiang Ding Jialin Wang Zhao Wang Zhengbiao Zhang State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China Suzhou Medical College Soochow UniversitySuzhouJiangsu 215123China The Department of Orthopedic Surgery Dushu Lake Hospital Affiliated to Soochow UniversitySuzhouJiangsu 215123China State Key Laboratory of Radiation Medicine and Protection Soochow UniversitySuzhouJiangsu 215123China

Recently,piezocatalysis has attracted considerable attention as a new type of renewable mechanical energy conversion technology,which relies on the strain induced polarization of the piezoelectric *** new technology has been extensively applied in the applications of water splitting,water remediation,gas purification and tumor *** the rapid development in the piezo-catalysis,the utilization of piezoelectric materials for synthetic purpose is still under *** means to promote or-ganic reactions expand the scope of piezoelectrically mediated reactions and show successes in both organic and polymer ***,we provide a comprehensive review on recent progress of piezoelectrically mediated reactions,catalytic mechanisms and applications in the last few *** limitations and future directions of this area are also *** believe this review will provide new insights into the underlying mechanism of piezoelectric mediated electron transfer process and guide the design of new chemistry.

关键词： Piezocatalysis Heterogeneous catalysis Mechanical energy Polymerization Organic synthesis Water spilling Tumor therapy Mechanoredox Piezoelectric material

Rate-limiting factors in hydrate decomposition through depressurization across various scales:A mini-review

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Chinese Journal of Chemical Engineering 2024年第3期67卷 206-219页

作者： Xian Sun peng Xiao Qinfeng Shi Lingban Wang Zhenbin Xu yuhao Bu Xiaohui Wang Yifei Sun Changyu Sun Guangjin Chen State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Jining University Jining 273115China

Natural gas hydrate is an energy resource for methane that has a carbon quantity twice more than all traditional fossil fuels ***,their practical application in the field has been limited due to the challenges of long-term preparation,high costs and associated *** studies,on the other hand,offer a safe and cost-effective means of exploring the mechanisms of hydrate dissociation and optimizing exploitation *** hydrate decomposition is a complicated process along with intrinsic kinetics,mass transfer and heat transfer,which are the influencing factors for hydrate decomposition *** identification of the rate-limiting factor for hydrate dissociation during depressurization varies with the scale of the reservoir,making it challenging to extrapolate findings from laboratory experiments to the actual *** review aims to summarize current knowledge of investigations on hydrate decomposition on the subject of the research scale(core scale,middle scale,large scale and field tests)and to analyze determining factors for decomposition rate,considering the various research scales and their associated influencing factors.

关键词： Gas hydrate Rate-limiting factors Research scale Depressurization Decomposition

A drug-loaded flexible substrate improves the performance of conformal cortical electrodes

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Bio-Design and Manufacturing 2024年第4期7卷 399-412页

作者： Rongrong Qin Tian Li Yifu Tan Fanqi Sun yuhao Zhou Ronghao Lv Xiaoli You Bowen Ji peng Li Wei Huang Frontiers Science Center for Flexible Electronics(FSCFE) Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&Engineering(IBME)Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China

Cortical electrodes are a powerful tool for the stimulation and/or recording of electrical activity in the nervous ***,the inevitable wound caused by surgical implantation of electrodes presents bacterial infection and inflammatory reaction risks associated with foreign body ***,inflammation of the wound area can dramatically worsen in response to bacterial *** consequences can not only lead to the failure of cortical electrode implantation but also threaten the lives of ***,we prepared a hydrogel made of bacterial cellulose(BC),a flexible substrate for cortical electrodes,and further loaded antibiotic tetracycline(TC)and the anti-inflammatory drug dexamethasone(DEX)onto *** encapsulated drugs can be released from the BC hydrogel and effectively inhibit the growth of Gram-negative and Gram-positive ***,therapeutic cortical electrodes were developed by integrating the drug-loaded BC hydrogel and nine-channel serpentine arrays;these were used to record electrocorticography(ECoG)signals in a rat *** to the controlled release of TC and DEX from the BC hydrogel substrate,therapeutic cortical electrodes can alleviate or prevent symptoms associated with the bacterial infection and inflammation of brain *** approach facilitates the development of drug delivery electrodes for resolving complications caused by implantable electrodes.

关键词： Antibacterial Anti-inflammatory Drug loading Cortical electrodes Bacterial cellulose hydrogel

Improvement strategy on thermophysical properties of A_(2)B_(2)O_(7)-type rare earth zirconates for thermal barrier coatings applications:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1147-1165页

作者： Zijian peng yuhao Wang Shuqi Wang Junteng Yao Qingyuan Zhao Enyu Xie Guoliang Chen Zhigang Wang Zhanguo Liu Yaming Wang Jiahu Ouyang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials and Metallurgical Engineering Inner Mongolia University of Science&TechnologyBaotou 014010China

The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced thermal conductivity in contrast with the currently used yttria-partially stabilized zirconia (YSZ) in high operating temperature *** review summarizes the recent progress on rare earth zirconates for TBCs that insulate high-temperature gas from hot-section components in gas *** on the first principles,molecular dynamics,and new data-driven calculation approaches,doping and high-entropy strategies have now been adopted in advanced TBC materials *** this paper,the solid-state heat transfer mechanism of TBCs is explained from two aspects,including heat conduction over the full operating temperature range and thermal radiation at medium and high *** paper also provides new insights into design considerations of adaptive TBC materials,and the challenges and potential breakthroughs are further highlighted for extreme environmental *** for improving thermophysical performance are proposed in two approaches:defect engineering and material compositing.

关键词： rare earth zirconates thermal barrier coatings defect engineering doping and compositing thermal conductivity thermal expansion

Method for the extraction of circulating nucleic acids based on MOF reveals cell-free RNA signatures in liver cancer

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National Science Review 2024年第1期11卷 94-106页

作者： Yuqing Sun Haixin Yu Shaoqing Han Ruoxi Ran Ying Yang Yongling Tang yuhao Wang Wenhao Zhang Heng Tang Boqiao Fu Boshi Fu Xiaocheng Weng Song-Mei Liu Hexiang Deng Shuang peng Xiang Zhou College of Chemistry and Molecular Sciences Key Laboratory of Biomedical Polymers-Ministry of Education Wuhan University Department of Digestive Surgical Oncology Union Hospital Tongji Medical College Huazhong University of Science and Technology Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and Technology Department of Clinical Laboratory Center for Gene Diagnosis and Program of Clinical Laboratory Zhongnan Hospital of Wuhan University College of Chemistry and Materials Science Hubei Engineering University Department of Pharmacology School of Pharmacy China Medical University Taikang Center for Life and Medical Sciences Wuhan University Department of Hematology Zhongnan Hospital of Wuhan University

Cell-free RNA(cf RNA) allows assessment of health, status, and phenotype of a variety of human organs and is a potential biomarker to non-invasively diagnose numerous diseases. Nevertheless, there is a lack of highly efficient and bias-free cf RNA isolation technologies due to the low abundance and instability of cf ***, we developed a reproducible and high-efficiency isolation technology for different types of cell-free nucleic acids(containing cf RNA and viral RNA) in serum/plasma based on the inclusion of nucleic acids by metal-organic framework(MOF) materials, which greatly improved the isolation efficiency and was able to preserve RNA integrity compared with the most widely used research kit method. Importantly, the quality of cf RNA extracted by the MOF method is about 10-fold that of the kit method, and the MOF method isolates more than three times as many different RNA types as the kit method. The whole transcriptome mapping characteristics of cf RNA in serum from patients with liver cancer was described and a cf RNA signature with six cf RNAs was identified to diagnose liver cancer with high diagnostic efficiency(area under curve = 0.905 in the independent validation cohort) using this MOF method. Thus, this new MOF isolation technique will advance the field of liquid biopsy, with the potential to diagnose liver cancer.

关键词： MOF circulating cell-free RNA biomarker liver cancer diagnosis

高速铁路板式轨道和大地的振动预测及对连续轨道板模型的讨论

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铁道学报 2022年第8期44卷 99-107页

作者：彭宇豪圣小珍张皓迪岳松涛上海工程技术大学城市轨道交通学院上海201620 西南交通大学牵引动力国家重点实验室四川成都610031

板式轨道交通引起的环境振动得到不少学者的研究,但这些研究通常将非连续的轨道板简化为连续无限长的欧拉-伯努利梁,且进一步假定轨道/大地结构在纵向(轨道延伸方向)是均匀的,这与实际情况不符。为研究上述简化方式对环境振动预测结果... 详细信息

板式轨道交通引起的环境振动得到不少学者的研究,但这些研究通常将非连续的轨道板简化为连续无限长的欧拉-伯努利梁,且进一步假定轨道/大地结构在纵向(轨道延伸方向)是均匀的,这与实际情况不符。为研究上述简化方式对环境振动预测结果的影响,建立移动简谐荷载作用下板式轨道交通引起的环境振动预测模型,在模型中考虑轨道板的非连续性和钢轨的离散支承,并视轨道/大地系统为无限长周期结构。基于傅里叶变换、周期结构理论和频率-波数域中大地的动柔度方法求解该周期结构对移动简谐力的稳态响应。以典型减振型无砟轨道为例,通过对比环境振动预测模型与简化模型的预测结果,明确将轨道/大地系统在纵向简化为均匀结构对临界速度、大地频谱和钢轨导纳的影响。结果表明:轨道板的自由弯曲模态对轨道/大地系统的响应可以有重要的影响,非连续的轨道板不能简化为连续无限长的梁;均匀的轨道/大地结构的临界速度产生机制仅为相速度与群速度的重叠,而周期轨道/大地结构的临界速度产生机制还可以是两条频散曲线的聚散(veering)。

关键词：大地振动周期结构减振型无砟轨道临界速度频散曲线聚散