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CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

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Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： jin-Peng Wang guo-Cui Mao Hui-Lin Jiang Bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： Metal hydride Ni catalysts Carbonate Metal-carbonate interface

Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 97-108页

作者： Pan guo Hong-Bo jin Cong-Feng Qiao Yue-Liang Wu The International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of Sciences The School of Physical Sciences University of Chinese Academy of Sciences Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University National Astronomical Observatories Chinese Academy of Sciences Institute of Theoretical Physics Chinese Academy of Sciences

For space-based gravitational wave （GW） detection,the main noise source for massive black hole binaries （MBHBs） is attributed to approximately 10～7double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratio ?DL/DLat the 95%confidence level,is enhanced by factors of ～*** angular resolutions,denoted by??s,are enhanced by a factor of ～*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries

Efficient and Stable Photoassisted Lithium-Ion Battery Enabled by Photocathode with Synergistically Boosted Carriers Dynamics

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NANO-MICRO LETTERS 2025年第1期17卷 1-15页

作者： Ma, Zelin Wang, Shiyao Ma, Zhuangzhuang Li, Juan Zhao, Luomeng Li, Zhihuan Wang, Shiyuan shuang, Yazhou Wang, Jiulong Wang, Fang Xia, Weiwei Jian, Jie He, Yibo Wang, Junjie guo, Pengfei Wang, Hongqiang Northwestern Polytech Univ Ctr Nano Energy Mat State Key Lab Solidificat Proc Sch Mat Sci & Engn Xian 710072 Peoples R China NPU Shaanxi Joint Lab Graphene Xian 710072 Peoples R China Northwestern Polytech Univ Sch Mat Sci State Key Lab Solidificat Proc Xian 710072 Peoples R China Northwestern Polytech Univ Engn Dept Xian 710072 Peoples R China Northwestern Polytech Univ Ctr Adv Lubricat & Seal Mat Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Northwestern Polytech Univ Shenzhen Res & Dev Inst Shenzhen 518063 Peoples R China Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Shaanxi Engn Lab Adv Energy Technol Shaanxi Key Lab Adv Energy DevicesSch Mat Sci & E Xian 710119 Peoples R China

Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries (PLIBs), while there is always a request on fast carrier transport in electrochemical active photocathodes. Present work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic nanocrystals. When employed in PLIBs, it was found effective for synchronously enhanced photocharge separation and transport in light charging process. Additionally, experimental photon spectroscopy, finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO2, as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky contact. Benefiting from these merits, several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set, including the capacity of 276 mAh g(-1 ) at 0.2 A g(-1 )under illumination, photoconversion efficiency of 1.276% at 3 A g(-1 ), less capacity and Columbic efficiency loss even through 200 cycles. These results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.

关键词： Photoassisted lithium-ion batteries Bulk heterojunction Carrier dynamics TiO2 nanofiber Plasmonic metal nanocrystals

Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching

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Chinese Journal of Polymer Science 2023年第7期41卷 1078-1092页

作者： Yu-shuang Miao Hua-Shuai Cui jin guo jin-Tang Zhu Yi-guo Li Zong-Bao Wang School of Materials Science and Chemical Engineering Key Laboratory of Impact and Safety EngineeringMinistry of EducationNingbo UniversityNingbo315211China State Key Laboratory of Biobased Fiber Manufacturing Technology China Textile AcademyBeijing100025China

Polyglycolide (PGA) fibers applied as surgical sutures strongly depend on their microstructure. The structural evolution of PGA nascent fibers during single low-temperature stretching and segmented high-temperature stretching was analyzed based on a combination of in situ WAXD/SAXS and DSC measurements. The results indicated that the hot stretching was conducive to the crystal perfection and the local fragmentation and recrystallization of the lamellar crystals may occur under stress induction. The single low-temperature stretching of PGA nascent fibers could be divided into three stages: the stretching of amorphous regions, stretch-induced crystallization and the stretching of crystalline regions. The elongation at break of the fibers can be substantially increased by adopting a segmented stretching method, and the high-temperature stretching can also significantly increase the crystallinity and orientation. The amorphous orientation peak appearing in the low-temperature stretching was gradually converted to crystallization peak during the heating process, which greatly improved the crystallinity and orientation of the fibers. High-temperature stretching compared with low-temperature stretching was more favorable for crystal perfection and structural evolution, where lamellar crystals underwent stress-induced fragmentation recrystallization to transform to fibrous crystals as the strain increased.

关键词： PGA fiber Structural evolution Hot stretching

沉积温度对氮化铝压电薄膜性能影响及机制分析

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光电子·激光 2025年第1期36卷 107-112页

作者：郭燕刘小军王进南京理工大学泰州科技学院天津三安光电有限公司

高频光电通信器件对压电材料特性要求越来越高，氮化铝（AlN）薄膜由于其优异的压电特性而备受关注，高取向高压电AlN薄膜沉积工艺优化成为其应用拓展的瓶颈技术之一，众多制备工艺参数中温度是影响AlN薄膜晶格取向的关键参数之一。本... 详细信息

高频光电通信器件对压电材料特性要求越来越高，氮化铝（AlN）薄膜由于其优异的压电特性而备受关注，高取向高压电AlN薄膜沉积工艺优化成为其应用拓展的瓶颈技术之一，众多制备工艺参数中温度是影响AlN薄膜晶格取向的关键参数之一。本文采用磁控溅射的方法沉积AlN薄膜，研究了沉积温度对AlN薄膜晶体取向及压电性能的影响，X射线衍射（X-ray diffraction, XRD）测试结果表明，250℃下可获得（100）取向AlN,300℃下AlN则优先（002）取向；压电测试结果表明，250℃下压电常数d*33达最大值0.79 V,表现出较优的压电特性。基于原子力显微镜（atomic force microscopy, AFM）结果及温度对价键稳定性影响分析探索了温度对其生长的影响机制。

关键词：氮化铝(AlN) 衬底温度取向生长压电特性

Study on the supramolecular systems of two basic violets with cyclodextrins by MWNTs/Nafion modified glassy carbon electrode

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Chinese Chemical Letters 2009年第8期20卷 981-984页

作者： jin Ping Song Yu jing guo Shao Min shuang Chuan Dong ~Research Center for Environmental Science and Engineering Shanxi University Taiyuan 030006 China Medical College of Shanxi Datong University Datong 037000 China

Abstract The electrochemical properties of two basic violets （methyl violet and ethyl violet） at the MWNTs/Nafion modified glassy carbon electrode were investigated. The redox of the basic violets is two-electron and two-proton process, and methyl violet presents stronger electron transfer capacity than ethyl violet. Meanwhile, the inclusion constants of the two basic violets with five CDs were determined by differential pulse voltammetry （DPV）. The two basic violets and CDs can form 1：1 complexes, The inclusion capacities of the two basic violets follow the same order： CM-β-CD 〉 HP-β-CD 〉 TM-β-CD 〉 DM-β- CD 〉 β-CD. ？2009 Yu jing guo. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Basic violet Carbon nanotubes Modified electrode Inclusion complexes

Effects of extracellular vesicles from mesenchymal stem cells on oxygen-glucose deprivation/reperfusioninduced neuronal injury

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World Journal of Emergency Medicine 2021年第1期12卷 61-67页

作者： shuang-shuang Gu Xiu-wen Kang Jun Wang Xiao-fang guo Hao Sun Lei Jiang jin-song Zhang Department of Emergency the First Affi liated Hospital of Nanjing Medical UniversityNanjing 210029China Key Laboratory of Modern Toxicology Ministry of EducationDepartment of ToxicologySchool of Public HealthNanjing Medical UniversityNanjing 211166China

BACKGROUND: Small extracellular vesicles (sEVs) from bone marrow mesenchymal stemcells (BMSCs) have shown therapeutic potential for cerebral ischemic diseases. However, themechanisms by which BMSC-derived sEVs (BMSC-sEVs) protect neurons against cerebral ischemia/reperfusion (I/R) injury remain unclear. In this study, we explored the neuroprotective effects ofBMSC-sEVs in the primary culture of rat cortical neurons exposed to oxygen-glucose deprivation andreperfusion (OGD/R) ***: The primary cortical neuron OGD/R model was established to simulate the processof cerebral I/R in vitro. Based on this model, we examined whether the mechanism through whichBMSC-sEVs could rescue OGD/R-induced neuronal ***: BMSC-sEVs (20 μg/mL, 40 μg/mL) significantly decreased the reactive oxygenspecies (ROS) productions, and increased the activities of superoxide dismutase (SOD) and glutathioneperoxidase (GPx). Additionally, BMSC-sEVs prevented OGD/R-induced neuronal apoptosis in vivo, asindicated by increased cell viability, reduced lactate dehydrogenase (LDH) leakage, decreased terminaldeoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) staining-positivecells, down-regulated cleaved caspase-3, and up-regulated Bcl-2/Bax ratio. Furthermore, Westernblot and flow cytometry analysis indicated that BMSC-sEV treatment decreased the expression ofphosphorylated calcium/calmodulin-dependent kinase II (p-CaMK II)/CaMK II, suppressed the increaseof intracellular calcium concentration ([Ca2+]i) caused by OGD/R in ***: These results demonstrate that BMSC-sEVs have signifi cant neuroprotectiveeff ects against OGD/R-induced cell injury by suppressing oxidative stress and apoptosis, and Ca2+/CaMK II signaling pathways may be involved in this process.

关键词： Oxygen-glucose deprivation and reperfusion Cortical neurons Oxidative stress Small extracellular vesicles

绿豆R2R3-MYB转录因子家族鉴定及其类黄酮合成调控基因的筛选

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作物学报 2025年第1期51卷 117-133页

作者：郭飞翔李春霞周爽郭彬彬张均马超河南科技大学农学院/河南省旱地农业工程技术研究中心河南洛阳471000

R2R3-MYB转录因子家族在植物次生代谢物合成、胁迫应答和生长发育等生命过程起着重要的调控作用。本研究基于生物信息学鉴定了绿豆(Vigna radiata L.)全基因组水平的R2R3-MYB转录因子,并对其理化性质、系统进化、染色体定位、启动子顺... 详细信息

R2R3-MYB转录因子家族在植物次生代谢物合成、胁迫应答和生长发育等生命过程起着重要的调控作用。本研究基于生物信息学鉴定了绿豆(Vigna radiata L.)全基因组水平的R2R3-MYB转录因子,并对其理化性质、系统进化、染色体定位、启动子顺式作用元件及基因结构做了预测分析;此外,转录组数据和实时荧光定量PCR(QuantitativeReal-timePCR,RT-PCR)分析该转录因子在不同组织、逆境胁迫下的表达模式;并基于相关分析及蛋白互作网络,筛选到可能参与调控绿豆类黄酮生物合成的R2R3-MYB成员。结果表明,共鉴定到168个R2R3-MYB成员,其中145个分布于11条染色体, 23个成员染色体信息未知;大多数R2R3-MYB含有3个外显子,编码99~1645个氨基酸,均为亲水性蛋白;系统进化将绿豆R2R3-MYB基因家族分为30个亚组(V1~V30),不同亚组成员的基因结构存在差异;共线性分析表明,片段复制事件均进行了纯化选择;启动子顺式作用元件分析表明,绿豆R2R3-MYB基因启动子区含有大量激素响应、胁迫响应及少量的类黄酮合成响应等元件;基因表达分析表明,在叶片、叶柄、下胚轴和籽粒种皮中表达量较高的成员分别占15.5%、16.1%、16.1%和10.7%。RT-PCR分析发现,几乎所有的R2R3-MYB家族成员在低温胁迫下的相对表达量显著下调,不同成员对逆境胁迫有不同的响应模式。蛋白互作与相关性分析可知,VrMYB6、VrMYB77、VrMYB93这3个基因可能参与了绿豆类黄酮生物合成的调控。

关键词：绿豆 R2R3-MYB转录因子转录因子家族分析类黄酮合成调控基因

Ferromagnetic half levitation of LK-99-like synthetic samples

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 114-120页

作者： Kaizhen guo Yuan Li shuang Jia International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center for Quantum Matter Beijing 100871China Interdisciplinary Institute of Light-Element Quantum Materials Research Center for Light-Element Advanced MaterialsPeking University Beijing100871China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We successfully synthesized polycrystalline LK-99-like ceramic samples with a solid-state-sintering *** X-ray diffraction shows that the main contents are Pb_(10-x)Cu_(x)(PO_(4))_(6)O and Cu_(2)S,consistent with recent reports (arXiv:2307.12037;arXiv:2308.01192).In some small flaky fragments,we successfully observed“half levitation”atop a Nd_(2)Fe_(14)B *** magnetization measurements on such small pieces,as well as on a large piece which does not exhibit the half levitation,we show that the samples ubiquitously contain weak yet definitive soft ferromagnetic *** argue that,together with the pronounced shape anisotropy of the small fragments,the soft ferromagnetism is sufficient to explain the observed half levitation in strong vertical magnetic *** measurements do not indicate the presence of the Meissner effect,nor zero resistance,in our samples,leading us to believe that our samples do not exhibit *** precise chemical composition and the physics behind the ferromagnetic component remain outstanding questions to be addressed in future research.

关键词： superconducting materials ferromagnetism magnetization curve