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Application of carbon-supported single-atom catalysts for electrochemical reactions

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新型炭材料(中英文) 2024年

作者： wang Yi-cheng MA Xiao-bo Ayeza wang Chen-xu LI Yang YANG Cheng-long wang zhe-fan wang Chao HU Chao ZHANG Ya-ting Xi'an Thermal Power Research Institute Co. Ltd. College of Chemistry and Chemical Engineering Xi'an University of Science and Technology Tsinghua Shenzhen International Graduate School Tsinghua University School of Chemical Engineering and Technology Xi'an Jiaotong University

The recent advances in carbon-supported single-atom catalysts (SACs) for electrochemical reactions are comprehensively reviewed. The development and advantages of carbon-supported SACs are briefly introduced, followed by a detailed summary of the synthesis strategies employed for various carbon-supported SACs, including vapor phase transport, high temperature pyrolysis,and wet chemical methods. Subsequently, the advanced characterization techniques for carbon-supported SACs are reviewed. The applications of carbon-supported SACs in diverse fields, such as oxygen reduction reaction, carbon dioxide reduction reaction, nitrogen reduction reaction, hydrogen evolution reaction, and oxygen evolution reaction are summarized. Special emphasis is given to the modification strategies enabling carbon-supported SACs to exhibit excellent electrocatalytic performance. Finally, the prospects and challenges associated with utilizing carbon-supported SACs for electrochemical reactions are discussed.

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Influences of shale microstructure on mechanical properties and bedding fractures distribution

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Petroleum Science 2024年第3期21卷 1944-1954页

作者： Ming-zhe Gu Mao Sheng Shi-Zhong Cheng fan-Hao Gong Gen-Sheng Li State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum-Beijing College of Petroleum Engineering China University of Petroleum-Beijing Shenyang Center of China Geological Survey

The difference in microstructure leads to the diversity of shale mechanical properties and bedding fractures distribution patterns. In this paper, the microstructure and mechanical properties of Longmaxi marine shale and Qingshankou continental shale were studied by X-ray diffractometer(XRD), field emission scanning electron microscope(FE-SEM) with mineral analysis system, and nanoindentation.Additionally, the typical bedding layers area was properly stratified using Focused Ion Beam(FIB), and the effects of microstructure and mechanical properties on the distribution patterns of bedding fractures were analyzed. The results show that the Longmaxi marine shale sample contains more clay mineral grains, while the Qingshankou continental shale sample contains more hard brittle mineral grains such as feldspar. For Longmaxi marine shale sample, hard brittle minerals with grain sizes larger than 20 μm is18.24% and those with grain sizes smaller than 20 μm is 16.22%. For Qingshankou continental shale sample, hard brittle minerals with grain sizes larger than 20 μm is 40.7% and those with grain sizes smaller than 20 μm is 11.82%. In comparison to the Qingshankou continental shale sample, the Longmaxi marine shale sample has a lower modulus, hardness, and heterogeneity. Laminated shales are formed by alternating coarse-grained and fine-grained layers during deposition. The average single-layer thickness of Longmaxi marine shale sample is greater than Qingshankou continental shale sample. The two types of shale have similar bedding fractures distribution patterns and fractures tend to occur in the transition zone from coarse-grained to fine-grained deposition. The orientation of the fracture is usually parallel to the bedding plane and detour occurs in the presence of hard brittle grains. The fracture distribution density of the Longmaxi marine shale sample is lower than that of the Qingshankou continental shale sample due to the strong heterogeneity of the Qingshankou continental shale. The current research provides guidel

关键词： Shale Nanoindentation Microstructure Mechanical property Fracture

Protective performance of shear stiffening gel-modified foam against ballistic impact:Experimental and numerical study

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Defence Technology（防务技术） 2024年第2期32卷 510-520页

作者： Huan Tu Haowei Yang Pengzhao Xu zhe Yang fan Tang Cheng Dong Yuchao Chen Lei Ren Wenjian Cao Chenguang Huang Yacong Guo Yanpeng Wei Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Xi'an Institute of Electromechanical Information Technology Xi'an 710065China Science and Technology on Transient Impact Laboratory Beijing 102202China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

As one of the most widely used personal protective equipment(PPE),body armors play an important role in protecting the human body from the high-velocity impact of bullets or projectiles.The body torso and critical organs of the wear may suffer severe behind-armor blunt trauma(BABT)even though the impactor is stopped by the body armor.A type of novel composite material through incorporating shear stiffening gel(STG)into ethylene-vinyl acetate(EVA)foam is developed and used as buffer layers to reduce BABT.In this paper,the protective performance of body armors composed of fabric bulletproof layers and a buffer layer made of foam material is investigated both experimentally and numerically.The effectiveness of STG-modified EVA in damage relief is verified by ballistic tests.In parallel with the experimental study,numerical simulations are conducted by LS-DYNA®to investigate the dynamic response of each component and capture the key mechanical parameters,which are hardly obtained from field tests.To fully describe the material behavior under the transient impact,the selected constitutive models take the failure and strain rate effect into consideration.A good agreement between the experimental observations and numerical results is achieved to prove the validity of the modelling method.The tests and simulations show that the impact-induced deformation on the human body is significantly reduced by using STG-modified EVA as the buffering material.The improvement of protective performance is attributed to better dynamic properties and more outstanding energy absorption capability of the composite foam.

关键词： Ballistic behavior Composite foam Shear stiffening gel Finite element analysis Protective mechanism

Effect of N-doping-derived solvent adsorption on electrochemical double layer structure and performance of porous carbon

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Journal of Energy Chemistry 2023年第5期80卷 120-127,I0004页

作者： zhe-fan wang Cheng Tang Qian Sun Ya-Lu Han Zhi-Jian wang Lijing Xie Shou-Chun Zhang fang-Yuan Su Cheng-Meng Chen CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina University of Chinese Academy of Sciences Bejing 100049China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBejing 100084Chind

N-doped porous carbon has been extensively investigated for broad electrochemical applications.The performance is significantly impacted by the electrochemical double layer(EDL),which is material dependent and hard to characterize.Limited understanding of doping-derived EDL structure hinders insight into the structure-performance relations and the rational design of high-performance materials.Thus,we analyzed the mass and chemical composition variation of EDL within electrochemical operation by electrochemical quartz crystal microbalance,in-situ X-ray photoelectron spectroscopy,and time-offlight secondary ion mass spectrometry.We found that N-doping triggers specifically adsorbed propylene carbonate solvent in the inner Helmholtz plane(IHP),which prevents ion rearrangement and enhances the migration of cations.However,this specific adsorption accelerated solvent decomposition,rendering rapid performance degradation in practical devices.This work reveals that the surface chemistry of electrodes can cause specific adsorption of solvents and change the EDL structure,which complements the classical EDL theory and provide guidance for practical applications.

关键词： Carbon materials Electrochemical double layer Electrochemical quartz crystal microbalance In-situ X-ray photoelectron spectroscopy N-doping

Development of a High-throughput Sequencing Platform for Detection of Viral Encephalitis Pathogens Based on Amplicon Sequencing

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Biomedical and Environmental Sciences 2024年第3期37卷 294-302页

作者： ZHANG Ya Li SU Wen zhe wang Rui Chen LI Yan ZHANG Jun Feng LIU Sheng Hui HU Dan He XU Chong Xiao YIN Jia Yu YIN Qi Kai HE Ying LI fan FU Shi Hong NIE Kai LIANG Guo Dong TAO Yong XU Song Tao MA Chao Feng wang Huan Yu Shaanxi University of Chinese Medicine Xianyang 712000ShaanxiChina National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China Guangzhou Center for Disease Control and Prevention Guangzhou 510000GuangdongChina Shandong Center for Disease Control and Prevention Jinan 250000ShandongChina Department of Ophthalmology Beijing Chaoyang HospitalCapital Medical UniversityBeijing 100020China Xi'an Center for Disease Control and Prevention Xi’an 710054ShaanxiChina

Objective Viral encephalitis is an infectious disease severely affecting human health.It is caused by a wide variety of viral pathogens,including herpes viruses,flaviviruses,enteroviruses,and other viruses.The laboratory diagnosis of viral encephalitis is a worldwide challenge.Recently,high-throughput sequencing technology has provided new tools for diagnosing central nervous system infections.Thus,In this study,we established a multipathogen detection platform for viral encephalitis based on amplicon sequencing.Methods We designed nine pairs of specific polymerase chain reaction(PCR)primers for the 12 viruses by reviewing the relevant literature.The detection ability of the primers was verified by software simulation and the detection of known positive samples.Amplicon sequencing was used to validate the samples,and consistency was compared with Sanger sequencing.Results The results showed that the target sequences of various pathogens were obtained at a coverage depth level greater than 20×,and the sequence lengths were consistent with the sizes of the predicted amplicons.The sequences were verified using the National Center for Biotechnology Information BLAST,and all results were consistent with the results of Sanger sequencing.Conclusion Amplicon-based high-throughput sequencing technology is feasible as a supplementary method for the pathogenic detection of viral encephalitis.It is also a useful tool for the high-volume screening of clinical samples.

关键词： Viral encephalitis Amplicon sequencing High-throughput sequencing Multipathogen detection

Association of tumor budding with clinicopathological features and prognostic value in stage III-IV colorectal cancer

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World Journal of Gastroenterology 2024年第2期30卷 158-169页

作者： Yue-Hao Luo zhe-Cheng Yan Jia-Ying Liu Xin-Yi Li Ming Yang Jun fan Bo Huang Cheng-Gong Ma Xiao-Na Chang Xiu Nie Department of Pathology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina

BACKGROUND Tumor budding(TB)has emerged as a promising independent prognostic biomarker in colorectal cancer(CRC).The prognostic role of TB has been extensively studied and currently affects clinical decision making in patients with stage I and II CRC.However,existing prognostic studies on TB in stage III CRC have been confined to small retrospective cohort studies.Consequently,this study investigated the correlation among TB categories,clinicopathological features,and prognosis in stage III-IV CRC to further enhance the precision and individualization of treatment through refined prognostic risk stratification.AIM To analyze the relationship between TB categories and clinicopathological characteristics and assess their prognostic value in stage III-IV CRC to further refine the prognostic risk stratification of stage III-IV CRC.METHODS The clinical data of 547 CRC patients were collected for this retrospective study.Infiltration at the front edge of the tumor buds was counted according to the 2016 International Tumor Budding Consensus Conference guidelines.RESULTS Multivariate Cox proportional hazards regression analysis demonstrated that chemotherapy(P=0.004),clinical stage IV(P<0.001),≥4 regional lymph node metastases(P=0.004),left-sided colonic cancer(P=0.040),and Bd 2-3(P=0.002)were independent prognostic factors in patients with stage III-IV CRC.Moreover,the density of tumor infiltrating lymphocytes was higher in Bd 1 than in Bd 2-3,both in the tumor stroma and its invasive margin.CONCLUSION TB has an independent predictive prognostic value in patients with stage III-IV CRC.It is recommended to complete the TB report of stage III-IV CRC cases in the standardized pathological report to further refine risk stratification.

关键词： Tumor budding Tumor infiltrating lymphocytes Colorectal cancer Survival analysis Prognosis

卤代烷气体灭火剂促进-抑制瓦斯燃爆特性试验

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煤炭科学技术 2024年第4期52卷 265-274页

作者：王涛董哲盛禹淮南凡杨哲杨鹏孟帆罗振敏西安科技大学安全科学与工程学院陕西西安710054

瓦斯爆炸是严重威胁煤矿安全生产的主要灾害之一,开发高效的瓦斯抑爆技术可有效提升瓦斯爆炸事故防控水平,而其重点在于抑爆材料的作用性能。为系统研究典型卤代烷气体灭火剂对瓦斯爆炸的作用效果,采用试验测试和理论分析相结合的方法,... 详细信息

瓦斯爆炸是严重威胁煤矿安全生产的主要灾害之一,开发高效的瓦斯抑爆技术可有效提升瓦斯爆炸事故防控水平,而其重点在于抑爆材料的作用性能。为系统研究典型卤代烷气体灭火剂对瓦斯爆炸的作用效果,采用试验测试和理论分析相结合的方法,系统研究了七氟丙烷(C_(3)HF_(7))、六氟丙烷(C_(3)H_(2)F_(6))和三氟甲烷(CHF_(3))等典型卤代烷气体对甲烷燃爆特性的影响,分别利用20 L球形爆炸装置和自研本生灯层流火焰传播速度系统测试了卤代烷对甲烷爆炸压力参数和层流燃烧速度的作用效果。得到了爆炸压力峰值、最大升压速率、层流燃烧速度等特征参数变化规律和层流火焰形貌演化特性。结果表明:富氧工况下卤代烷随添加体积分数的增大而对甲烷燃爆过程表现出明显的促进−抑制双重作用。在化学当量条件下,仅C_(3)HF_(7)对甲烷爆炸压力峰值、最大升压速率有先促进后抑制的作用,CHF_(3)和C_(3)H_(2)F_(6)均表现出抑制作用;3种卤代烷气体对甲烷层流燃烧速度均表现出抑制作用。在贫氧工况中,3种卤代烷气体对甲烷的爆炸压力峰值,最大升压速率和层流燃烧速度均表现出抑制作用。整体而言,C_(3)H_(2)F_(6)和C_(3)HF_(7)对甲烷爆炸压力特征参数和层流燃烧速度的抑制效果优于CHF_(3)。理论分析结果显示,富氧工况下卤代烷随掺混体积分数的增大而表现出的促进−抑制双重作用,可归因于其对体系反应过程中热释放特性的提升与其主要含F中间产物对H、O和OH等关键自由基的抑制之间的竞争结果。研究结果为瓦斯爆炸防治相关理论研究和技术开发提供一定的理论依据。

关键词：瓦斯爆炸卤代烷爆炸抑制促爆作用爆炸压力层流燃烧速度

Zinc finger protein 831 promotes apoptosis and enhances chemosensitivity in breast cancer by acting as a novel transcriptional repressor targeting the STAT3/Bcl2 signaling pathway

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Genes & Diseases 2024年第1期11卷 430-448页

作者： Jun fan zhe Zhang Hongqiang Chen Dongjiao Chen Wenbo Yuan Jingzhi Li Yong Zeng Shimeng Zhou Shu Zhang Gang Zhang Jiashen Xiong Lu Zhou Jing Xu Wenbin Liu Yan Xu Department of Breast and Thyroid Surgery Daping HospitalArmy Medical University(Third Military Medical University)Chongqing 400042China Institute of Toxicology College of Preventive MedicineArmy Medical University(Third Military Medical University)Chongqing 400038China Department of Environmental Health College of Preventive MedicineArmy Medical University(Third Military Medical University)Chongqing 400038China Anesthesia and Intensive Care Chinese University of Hong KongHong Kong SAR 999077China School of Public Health Xinxiang Medical UniversityXinxiangHenan 453003China School of Public Health China Medical UniversityShenyangLiaoning 110122China

Emerging evidence suggested that zinc finger protein 831(ZNF831)was associated with immune activity and stem cell regulation in breast cancer.Whereas,the roles and molec-ular mechanisms of ZNF831 in oncogenesis remain unclear.ZNF831 expression was significantly diminished in breast cancer which was associated with promoter CpG methylation but not mu-tation.Ectopic over-expression of ZNF831 suppressed breast cancer cell proliferation and col-ony formation and promoted apoptosis in vitro,while knockdown of ZNF831 resulted in an opposite phenotype.Anti-proliferation effect of ZNF831 was verified in vivo.Bioinformatic analysis of public databases and transcriptome sequencing both showed that ZNF831 could enhance apoptosis through transcriptional regulation of the JAK/STAT pathway.ChiP and luciferase report assays demonstrated that ZNF831 could directly bind to one specific region of STAT3 promoter and induce the transcriptional inhibition of STAT3.As a result,the attenuation of STAT3 led to a restraint of the transcription of Bcl2 and thus accelerated the apoptotic progression.Augmentation of STAT3 diminished the apoptosis-promoting effect of ZNF831 in breast cancer cell lines.Furthermore,ZNF831 could ameliorate the anti-proliferation effect of capecitabine and gemcitabine in breast cancer cell lines.Our findings demonstrate for the first time that ZNF831 is a novel transcriptional suppressor through inhibiting the expression of STAT3/Bcl2 and promoting the apoptosis process in breast cancer,suggesting ZNF831 as a novel biomarker and potential therapeutic target for breast cancer patients.

关键词： Apoptosis Breast cancer Chemosensitivity STAT3 ZNF831

Two-dimensional atomically thin Pt layers on MXenes: The role of electronic effects during catalytic dehydrogenation of ethane and propane

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Nano Research 2024年第3期17卷 1251-1258页

作者： zhe Li Tobias K.Misicko fan Yang Xiaopeng Liu zhenwei Wu Xiaoyang Gao Tao Ma Jeffrey T.Miller Daniela S.Mainardi Collin D.Wick zhenhua Zeng Yang Xiao Yue Wu Department of Chemical and Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA Davidson School of Chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan Center for Materials Characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA College of Engineering and Science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized on the surface of Mo2TiC2 MXenes and used for the catalytic dehydrogenation of ethane and propane into ethylene and propylene,two important chemicals for the petrochemical industry.As compared with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed superior coke-resistance(no deactivation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and selectivity(>95%)toward ethylene and propylene.The unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is negligible.It is found that the electronic effect plays a critical role in dehydrogenative product selectivity and catalyst stability.The metal–support interaction is found dependent on the substrate and metal components,providing wide opportunities to explore high-performance MXene-supported metallic catalysts.

关键词： MXene catalysis alkane dehydrogenation nanolayers