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Millimeter-sized few-layer graphene sheets with aligned channels for fast lithium-ion charging kinetics

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Journal of Energy Chemistry 2021年第4期30卷 62-69页

作者： Yu-Qi Zhou Xiao-Ling Dong wen-cui Li Guang-Ping Hao Dong Yan An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Assembly of the top-down graphene units mostly results in 3D porous structure with randomly organized *** direct bottom-up synthesis of macroscopic 2D graphene sheets with organized pores are long sought in materials chemistry field,but rarely ***,we present a self-catalysisassisted bottom-up route usingL-glutamic acid and iron chloride as starting materials for the fabrication of the millimeter-sized few-layer graphene sheets with aligned porous channels parallel to the 2D *** amino-and carboxyl-functional groups inL-glutamic acid can coordinate with iron cations,thus allowing an atomic dispersion of iron *** pyrolysis thus initiated the growth of graphene catalyzed by in-situ generated iron nanoparticles,and a dynamic flow of iron nanoparticles eventually led to the formation of millimeter-sized few-layer graphene sheets with aligned channels(60-85 nm in diameter).Used as anodes in lithium-ion batteries,these graphene sheets showed a good rate capability(142 m A h g^(-1) at 2 A g^(-1))and high capacity retention of 93%at 2 A g^(-1) after 1200 *** analysis revealed that lithium ions storage was dominated by diffusion behavior and capacitive behavior together,in that graphene sheets with aligned channels could accelerate electron transfer and shorten lithium ions transport *** work provides a novel approach to prepare unique porous graphene materials with specific structure for energy storage.

关键词： Few-layer graphene Aligned channels Catalytic growth Lithium-ion batteries

Earth-Abundant CaCO_(3)-Based Photocatalyst for Enhanced ROS Production,Toxic By-Product Suppression,and Efficient NO Removal

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Energy & Environmental Materials 2022年第3期5卷 928-934页

作者： wen cui wenjia Yang Peng Chen Lvcun Chen Jieyuan Li Yanjuan Sun Ying Zhou Fan Dong The Center of New Energy Materials and Technology School of Materials Science and EngineeringSouthwest Petroleum UniversityChengdu 610500China Yangtze Delta Region Institute(Huzhou)&Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaHuzhou 313000China Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China State Centre for International Cooperation on Designer Low Carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Photoinduced reactive oxygen species(ROS)-based pollutant removal is one of the ideal solutions to achieve the conversion of solar energy into chemical energy and thus to address environmental ***,earthabundant CaCO_(3)-decorated g-C_(3)N_(4)(g-C_(3)N_(4)labeled as CN,CaCO_(3)-decorated g-C_(3)N_(4)sample labeled as CN-CCO)has been constructed by a facile thermal polymerization method for safe and efficient photocatalytic NO *** decorated CaCO_(3)as“transit hub”extends theπbonds of CN to deviate from the planes and steers the random charge carriers,which thus provides extra active sites and expedites spatial charge separation to facilitate adsorption/activation of reactants and promote formation of ROS participating in the removal of ***,boosted generation of ROS regulates the photocatalytic NO oxidation pathway and thus increases the selectivity of *** prefers to be directly oxidized into final product(nitrate)rather than toxic intermediates(NO_(2)),which is well demonstrated by theoretically simulated ROS-based reaction pathways and experimental *** present work promotes the degradation of pollutant and simultaneously suppresses the formation of toxic by-product,which paves the way for ROS-based pollutant removal.

关键词： in situ DRIFTS photocatalytic NO removal reaction pathway ROS production toxic by-product suppression

Pollution tracks of r-process material in[Sr/Ba]vs.[Ba/Fe]space for the early Galaxy

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Research in Astronomy and Astrophysics 2021年第5期21卷 91-100页

作者： Wan-Qiang Han Guo-Chao Yang Lu Zhang wen-Yuan cui Ping Niu Fang wen Bo Zhang Department of Physics Hebei Normal UniversityShijiazhuang 050024China Department of Physics Shijiazhuang UniversityShijiazhuang 050035China School of Sciences Hebei University of Science and TechnologyShijiazhuang 050018China College of Mathematics and Information Science Hebei Normal UniversityShijiazhuang 050024China

In the early Galaxy,elemental abundances of the extremely metal-poor(EMP)stars contain abundant information about the neutron-capture nucleosynthesis and the chemical enrichment *** this work,we study the abundance characteristics of Sr and Ba for the EMP stars in the[Sr/Ba]vs.[Ba/Fe]*** find that there are three boundaries for the distribution region of the EMP *** weak rprocess star CS 22897-008 lies on the upper end and the main r-process stars lie on the right end of the *** the right boundary of the distribution region,there is an Fe-normal *** the EMP stars in the belt,element Fe dominantly originates from the normal massive *** low-Sr stars([Sr/Fe]6−0.3)distribute in the region of the lower left of the Fe-normal belt and their Fe should originate partly from the prompt *** find that the formation of the lower boundary of the distribution region is due to the pollution of the main r-process material and the formation of the right boundary could be explained by the combination of the weak r-and main r-process ***,the formation of the left boundary is due to the pollution of the weak r-process *** the[Sr/Ba]ratios are related to the relative importance of the weak r-process material,the scatter of[Sr/Ba]ratios for the EMP stars mainly depends on the abundance ratio of the weak r-process.

关键词： stars:abundances stars:formation stars:massive

Chemerin Exacerbates Psoriasis by Stimulating Keratinocyte Proliferation and Cytokine Production

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Current Medical Science 2023年第2期43卷 399-408页

作者： Shu-min KONG Xiao-yan SUN wen-ya cui Yu-chun CAO Department of Dermatology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

Objective Psoriasis is often combined with metabolic abnormalities,such as obesity and *** upregulation of chemerin,which is an essential protein produced primarily from white fat,is strongly correlated to the development of ***,there is no clarification on its exact function and mechanism in disease *** present study aims to determine its function and mechanism in disease *** The present study used a psoriasislike inflammatory cell model and imiquimod(IMQ)-induced mouse model to confirm whether chemerin is upregulated in psoriasis *** Chemerin enhanced the keratinocyte proliferation,inflammatory cytokine secretion,and activation of the MAPK signaling ***,the intraperitoneal injection of neutralizing anti-chemerin antibody(ChAb)diminished the epidermal proliferation and inflammation in the IMQ-induced mouse *** The present results indicate that chemerin promotes keratinocyte proliferation,and enhances the production of inflammatory cytokines,thereby aggravating the ***,chemerin can be a prospective target for the treatment of psoriasis.

关键词： psoriasis keratinocyte chemerin proliferation inflammation

外周血Klotho水平对超声引导下PTA术后AVF再狭窄的预测价值

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河北医科大学学报 2024年第9期45卷 1079-1084页

作者：武亮祁桠楠焦文翠严鹏温会欣郑慧霄邢台医学高等专科学校第二附属医院肾内科河北邢台054000 邢台医学高等专科学校第二附属医院功能科河北邢台054000 邢台医学高等专科学校第二附属医院医务科河北邢台054000

目的探讨外周血Klotho蛋白对终末期肾脏病(end stage renal disease,ESRD)患者经皮腔内血管成形术(percutaneous transluminal angioplasty,PTA)后发生动静脉内瘘(arteriovenous fistula,AVF)再狭窄的预测价值。方法选取邢台医学高等专科学校第二附属医院行PTA手术的240例ESRD患者为研究对象,随访截止时间为2022年12月,根据是否发生AVF再狭窄分为狭窄组和非狭窄组。检测并比较2组的外周血Klotho水平,分析外周血Klotho与AVF再狭窄的相关性和预测价值,并收集2组的临床资料,进行单因素分析和多元Logistic回归分析,探究VAF再狭窄的独立危险因素。结果狭窄组外周血Klotho显著低于非狭窄组,差异有统计学意义(P50 mmol/L(OR=3.804,95%CI:1.155~12.524)、Klotho蛋白<1.35 ng/L(OR=2.863,95%CI:1.272~6.446)是ESRD患者PTA术后发生再狭窄的独立危险因素(P<0.05)。结论外周血Klotho水平与ESRD患者PTA术后发生AVF再狭窄具有负相关性,具有较高的预测价值,外周血Klotho水平下降与高龄、糖化血红蛋白水平升高、血清白蛋白水平下降以及钙磷乘积升高是AVF再狭窄的独立危险因素。

关键词：肾功能衰竭,慢性经皮腔内血管成形术动静脉内瘘

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Multilevel structured carbon film as cathode host for Li-S batteries with superhigh-areal-capacity

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Nano Research 2021年第5期14卷 1273-1279页

作者： Bin He wen-cui Li Zhi-Yuan Chen Lei Shi Yu Zhang Ji-Li Xia An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian116024China

The commercialization of lithium-sulfur (Li-S) battery could be accelerated by designing advanced sulfur cathode with high sulfur utilization and stable cycle life at a high sulfur loading. To allow the energy density of Li-S batteries comparable to that of commercial Li-ion batteries, the areal capacity of sulfur cathode should be above 4 mA·h·cm−2. In general, a high sulfur loading often causes rapid capacity fading by slowing electron/ion transport kinetics, catastrophic shuttle effect and even cracking the electrodes. To address this issue, herein, a multilevel structured carbon film is built by covering highly conductive CNTs and hollow carbon nanofiber together with carbon layer via chemical vapor deposition. The self-standing carbon film exhibits well-interweaved conductive network, hollow fibrous structure and abundant N, O co-doped active sites, which combine the merits of high electronic conductivity (1200·S·m−1), high porosity and polar characteristic in one host. Benefiting from this attractive multilevel structure, the obtained sulfur cathode based on the carbon film host shows an ultra-high areal capacity of 8.9 mA·h·cm−2 at 0.2 C with outstanding cyclability over 60 cycles. This work shed light on designing advanced sulfur host for Li-S batteries with high areal capacity and high cycle stability, and might make a contribution to the commercialization of Li-S batteries.

关键词： multilevel structure carbon film sulfur host conductivity areal capacity

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六环石改性杨木木材的制备

林产工业 2024年第5期61卷 24-27,69页

作者：崔文燕王明涛章宇麒罗执赢于建芳内蒙古农业大学材料科学与艺术设计学院内蒙古呼和浩特010018 内蒙古自治区沙生灌木资源纤维化和能源化开发利用重点实验室内蒙古呼和浩特010018

为提高木材利用率,改善人工速生林密度低、强度低、易皱缩变形等不足,本文以人工速生杨木为研究对象,以内蒙古自治区特有的矿物六环石为改性材料,采用真空加压浸渍改性技术将六环石注入木材中,并对改性材的性能进行测试与表征。结果表明... 详细信息

为提高木材利用率,改善人工速生林密度低、强度低、易皱缩变形等不足,本文以人工速生杨木为研究对象,以内蒙古自治区特有的矿物六环石为改性材料,采用真空加压浸渍改性技术将六环石注入木材中,并对改性材的性能进行测试与表征。结果表明:六环石改性杨木木材的最佳浸渍次数为8次,单次浸渍工艺为真空浸渍120 min,常压浸渍5 min,再进行绝干处理。改性后的木材其平均增重率及吸液率分别为15.33%和146.37%,较素材的气干密度和全干密度分别提高了23.25%和21.95%。研究结果为改性材的制备和利用提供了新思路。

关键词：浸渍改性六环石速生杨木改性材物理性能

Influence of plasma on the densification mechanism of SPS under multi-field effect

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International Journal of Minerals,Metallurgy and Materials 2014年第9期21卷 906-912页

作者： Yu-hong Chang Di Huang Cheng-chang Jia Zhao-wen cui Cong-cong Wang Dong Liang School of Materials Science and Engineering University of Science and Technology Beijing

The densification mechanism of an Fe-based alloy powder containing tiny oxide particles under the synergic multi-field effect of spark plasma sintering （SPS） was investigated. Metallographic microscopy and scanning electron microscopy were used to observe the morphology of samples sintered at different temperatures, and the temperature dislribution in an individual spherical powder particle during sintering was calculated in consideration of the influence of plasma, which was qualified and quantified through the analysis of the U-Icurve. The plasma was observed to play a substantial role in activating and heating the samples at the very early stage of sintering, whereas the joule-heat effect played a dominant role during sintering. Moreover, the plasma also facilitated the diffusion and migration of materials for neck formation.

关键词： iron alloys spark plasma sintering plasma temperature distribution densification diffusion

北京市再生水补水河流中抗生素的赋存特征及生态风险评估

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环境科学 2024年第9期45卷 5244-5253页

作者：武亚林徐井旭刘桂中方瑶瑶蒋宝孙成一孙长虹凌文翠北京市生态环境保护科学研究院国家城市环境污染控制工程技术研究中心北京100037

以北京市再生水补水河流凉水河为研究区域,检测了水体和沉积物中16种抗生素的种类、检出率和浓度(含量)水平,探讨其时空变化和赋存特征.在水体和沉积物中分别检测到9种和13种抗生素,抗生素的浓度(含量)范围分别为ND~116.68 ng·L^(−1)和... 详细信息

以北京市再生水补水河流凉水河为研究区域,检测了水体和沉积物中16种抗生素的种类、检出率和浓度(含量)水平,探讨其时空变化和赋存特征.在水体和沉积物中分别检测到9种和13种抗生素,抗生素的浓度(含量)范围分别为ND~116.68 ng·L^(−1)和ND~235.42 ng·g^(−1).水体中的主要抗生素为氧氟沙星和克拉霉素,沉积物中的主要抗生素为氧氟沙星.凉水河水体和沉积物中的抗生素总浓度(含量)表现为自上游至下游逐渐降低的趋势,其支流浓度(含量)高于干流.支流汇入对凉水河水体抗生素水平有明显影响,但对沉积物则影响不大.枯水期水体和沉积物中的抗生素总浓度(含量)整体高于丰水期.丰水期水体中检出浓度最高的是喹诺酮类抗生素,枯水期则为大环内酯类抗生素;沉积物在两季中检出含量最高的均为喹诺酮类抗生素.生态风险评价结果表明,水体中克拉霉素在枯水期表现为低风险,克拉霉素在两季沉积物中具有低风险,其余抗生素均表现为无风险.联合生态风险及最敏感营养级生态风险表明,所有点位生态风险表现为低风险和无风险,枯水期整体大于丰水期.部分点位在枯水期时接近中风险阈值,需引起重视.

关键词：抗生素再生水城市河流赋存特征生态风险