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Interface-enhanced thermoelectric output power in CrN/SrTiO_(3-x) heterostructure

Journal of Energy Chemistry 2022年第1期31卷 16-22,I0002页

作者： Xueying Wan Xiaowei Lu Lin Sun Mingyu Chen Na Ta Wei liu Qi Chen Liwei Chen Jian He Peng Jiang xinhe Bao State Key Laboratory of Catalysis CAS Center for Excellence in NanoscienceDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123jiangsuChina Department of Physics and Astronomy Clemson UniversityClemson 29634-0978USA

Thermoelectric devices enable direct conversion between thermal and electrical *** studies have indicated that the thin film/substrate heterostructure is effective in achieving high thermoelectric performance via decoupling the Seebeck coefficient and electrical conductivity otherwise adversely inter-dependent in homogenous bulk ***,the mechanism underlying the thin film/substrate heterostructure thermoelectricity remains *** addition,the power output of the thin film/substrate heterostructure is limited to the nanowatt scale to date,falling short of the practical application ***,we fabricated the CrN/SrTiO_(3-x) heterostructures with high thermoelectric output power and outstanding thermal *** varying the CrN film thickness and the reduction degree of CrN/SrTiO_(3-x) substrate,the optimized power output and the power density have respectively reached 276μWand 10^(8) mW/cm^(2) for the 30 nm CrN film on a highly reduced surface of CrN/SrTiO_(3-x) under a temperature difference of 300 *** performance enhancement is attributed to the CrN/CrN/SrTiO_(3-x) heterointerface,corroborated by the band bending as revealed by the scanning Kelvin probe *** results will stimulate further research efforts towards interface thermoelectrics.

关键词： SrTi0_(3-x) CrN Heterostructure Interface thermoelectrics Thin film

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Highly efficient catalytic scavenging of oxygen free radicals with graphene-encapsulated metal nanoshields

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Nano Research 2018年第5期11卷 2821-2835页

作者： Junying Wang Xiaoju Cui Haobo Li Jianping Xiao Jiang Yang Xiaoyu Mu Haixia liu Yuan-Ming Sun Xuhui Xue Changlong liu Xiao-Dong Zhang Dehui Deng xinhe Bao Department of Physics Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of Science Tianjin University Tianjin 300350 China State Key Laboratory of Catalysis Collaborative Innovation Center of Chemistry for Energy Materials Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China University of Chinese Academy of Sciences Beijing 100039 China Tianjin Key Laboratory of Molecular Nuclear Medicine Institute of Radiation Medicine Chinese Academy of Medical Sciences and Peking Union Medical College Tianjin 300192 China State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine Sun Yat-sen University Cancer Center Guangzhou 510060 China

Normal levels of oxygen free radicals play an important role in cellular signal transduction, redox homeostasis, regulatory pathways, and metabolic processes. However, radiolysis of water induced by high-energy radiation can produce excessive amounts of exogenous oxygen free radicals, which cause severe oxidative damages to all cellular components, disrupt cellular structures and signaling pathways, and eventually lead to death. Herein, we show that hybrid nanoshields based on single-layer graphene encapsulating metal nanoparticles exhibit high catalytic activity in scavenging oxygen superoxide （·O2^-）, hydroxyl （·OH）, and hydroperoxyl （HO2·） free radicals via electron transfer between the single-layer graphene and the metal core, thus achieving biocatalytic scavenging both in vitro and in vivo. The levels of the superoxide enzyme, DNA, and reactive oxygen species measured in vivo dearly show that the nanoshields can efficiently eliminate harmful oxygen free radicals at the cellular level, both in organs and circulating blood. Moreover, the nanoshields lead to an increase in the overall survival rate of gamma ray-irradiated mice to up to 90%, showing the great potential of these systems as protective agents against ionizing radiation.

关键词： biocatalytic processes radiation protection graphene-encapsulated metal nanoparticles oxygen free radical DFT calculations

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Scalable and fast fabrication of graphene integrated micro-supercapacitors with remarkable volumetric capacitance and flexibility through continuous centrifugal coating

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Journal of Energy Chemistry 2021年第1期30卷 284-290,I0009页

作者： Xiaoyu Shi Lijun Tian Sen Wang Pengchao Wen Ming Su Han Xiao Pratteek Das Feng Zhou Zhaoping liu Chenglin Sun Zhong-Shuai Wu xinhe Bao Department of Chemical Physics University of Science and Technology of ChinaHefei 230026AnhuiChina Great Scientific Research Institute Datong Coal Mine Group Co.LtdDatong 037003ShanxiChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Ningbo Graphene Innovation Center Co. LtdNingbo 315200ZhejiangChina Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina

Microscale electrochemical energy storage devices,e.g., micro-supercapacitors(MSCs),possessing tailored performance and diversified form factors of lightweight,miniaturization,flexibility and exceptional integration are highly necessary for the smart power sources-unitized *** the great progress,the fabrication of MSCs combining high integration with high volumetric performance remains largely ***,we develop a simple,fast and scalable strategy to fabricate graphene based highly integrated MSCs by a new effective continuous centrifugal coating ***,the resulting highly conductive graphene films can act as not only patterned microelectrodes but also metal-free current collectors and interconnects,endowing modular MSCs with high integrity,remarkable flexibility,tailored voltage and capacitance output,and outstanding performance *** importantly,the strong centrifugal force and shear force generated in continuous centrifugal coating process lead to graphene films with high alignment,compactness and packing density,contributing to excellent volumetric capacitance of ~31.8 F cm^(-3) and volumetric energy density of ~2.8 mWh cm^(-3),exceeding most reported integrated ***,our work paves a novel way for simple and scalable fabrication of integrated MSCs and offers promising opportunities as standalone microscale power sources for new-generation electronics.

关键词： Integrated micro-supercapacitors Continuous centrifugal coating Graphene Flexibility Volumetric capacitance

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CO adsorption on a Pt(111) surface partially covered with FeO_x nanostructures

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Journal of Energy Chemistry 2017年第4期26卷 602-607页

作者： Yun liu Fan Yang Yanxiao Ning Qingfei liu Yi Zhang Hao Chen xinhe Bao State Key Laboratory of Catalysis CAS Center for Excellence in NanoscienceCollaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

The adsorption of CO on Pt group metals, as a most fundamental elementary reaction step, has been widely studied in catalysis and electrocatalysis. Particularly, the structures of CO on Pt(111) have been extensively investigated, owing to its importance to both fundamental and applied catalysis. Yet, much less is known regarding CO adsorption on a Pt(111) surface modulated by supported oxide nanostructures,which is of more relevance to technical catalysis. We thus investigated the coverage-dependent adsorption of CO on a Pt(111) surface partially covered by Fe Oxnanostructures, which has been demonstrated as a remarkable catalyst for low-temperature CO oxidation. We found that, due to its strong chemisorption, the coverage-dependent structure of CO on bare Pt is not influenced by the presence of Fe Ox. But,oxygen-terminated Fe Oxnanostructures could modulate the diffusivity of CO at their vicinity, and thus affect the formation of ordered CO superstructures at low temperatures. Using scanning tunneling microscopy(STM), we inspected the diffusivity of CO, followed the phase transitions of CO domains, and resolved the molecular details of the coverage-dependent CO structures. Our results provide a full picture for CO adsorption on a Pt(111) surface modulated by oxide nanostructures and shed lights on the inter-adsorbate interaction on metal surfaces.

关键词： CO adsorption STM FeO Pt(111) Adsorbate structure

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Orthorhombic Y_(0.95-x)Sr_(x)Co_(0.3)Fe_(0.7)O_(3-δ) anode for oxygen evolution reaction in solid oxide electrolysis cells

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Fundamental Research 2021年第4期1卷 439-447页

作者： Weicheng Feng Yuefeng Song Tianfu liu Jingwei Li Xiaomin Zhang Junhu Wang Guoxiong Wang xinhe Bao State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning 116023China College of Energy University of Chinese Academy of SciencesBeijing 100039China Center for Advanced Mössbauer Spectroscopy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning 116023China

Cubic perovskite oxides usually suffer from delamination and Sr^(2+) segregation for catalyzing oxygen evolution reaction (OER) at the anodes of solid oxide electrolysis cells (SOECs). It is crucial to develop alternative and efficient anode materials for SOECs. Herein, a series of novel Y_(0.95-x)Sr_(x)Co_(0.3)Fe_(0.7)O_(3-δ) (YSCF-x) orthorhombic perovskite oxides in the Pnma (62) space group are synthesized as anode materials of SOECs. Physicochemical characterizations and density functional theory calculations reveal that the partial substitution of Y^(3+) by Sr^(2+) increases the oxygen vacancy concentration and mobility as well as improves the electrical conductivity, which contributes to the excellent OER activity of YSCF-x. At 800 °C, the current density of SOEC with YSCF-0.05-Ce0.8Sm0.2O2-δ anode can reach 1.32 A cm^(−2) at 1.6 V, about twice that of SOEC with Y_(0.95-x)Sr_(x)Co_(0.3)Fe_(0.7)O_(3-δ)-Ce_(0.8)Sm_(0.2)O_(2-δ) anode. This work paves a new avenue for the design of advanced anode materials of SOECs.

关键词： Orthorhombic perovskite Oxygen vacancy Oxygen evolution reaction Solid oxide electrolysis cells CO_(2)electrolysis

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Boron-rich layer removal and surface passivation of boron-doped p–n silicon solar cells

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Journal of Semiconductors 2018年第12期39卷 19-22页

作者： Caixia Hou Rui Jia Ke Tao Shuai Jiang Pengfei Zhang Hengchao Sun Sanjie liu Mingzeng Peng xinhe Zheng School of Mathematics and Physics Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceUniversity of Science and Technology Beijing Institute of Microelectronics Chinese Academy of Sciences

In boron-doped p+-n crystalline silicon（Si） solar cells, p-type boron doping control and surface passivation play a vital role in the realization of high-efficiency and low cost pursuit. In this study, boron-doped p+-emitters are formed by boron diffusion in an open-tube furnace using borontribromide（BBr3） as precursor. The formed emitters are characterized in detail in terms of shape of the doping profile, surface doping concentration, junction depth, sheet resistance and removal of the boron-rich layer（BRL）. In the aspect of BRL removal, three different methods were adopted to investigate their influence on device performance. The results demonstrate that our proposed chemical etch treatment（CET） with the proper etching time could be an effective way to remove the *** removal of the BRL, Al;O;/SiN;stacks are deposited by atomic layer deposition（ALD） and plasma-enhanced chemical vapor deposition（PECVD） to passivate the cell surface. It was found that a reasonably-high implied Voc of 680 mV has been achieved for the fabricated n-type Si solar cells.

关键词： p^+–n Si solar cell boron-rich layer Al_2O_3/SiN_x stack surface passivation

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大型水轮发电机定子线棒局部放电在线监测研究进展及展望

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西北水电 2022年第5期 35-40页

作者：陈科元马山刚金福宝尹帅虎李若冰石进强冷雪健粘晨辉刘新贺青海大学水利电力学院西宁810016

水轮发电机定子线棒局部放电是影响发电机绝缘的主要原因,绝缘破坏严重将导致发电机出现故障,甚至产生安全事故。国内外学者对发电机定子线棒局部放电在线监测开展了大量研究,并在大量的应用实践中取得了丰硕的成果。然而,随着工程实践... 详细信息

水轮发电机定子线棒局部放电是影响发电机绝缘的主要原因,绝缘破坏严重将导致发电机出现故障,甚至产生安全事故。国内外学者对发电机定子线棒局部放电在线监测开展了大量研究,并在大量的应用实践中取得了丰硕的成果。然而,随着工程实践的深入,在线监测系统暴露出诸多问题,局部放电在线监测面临新的挑战。通过阐述抗干扰技术、局放源的定位以及局放量与绝缘状况关系3个方面的研究现状,对发电机定子线棒局部放电在线监测的发展趋势进行了展望。

关键词：水轮发电机定子线棒局部放电在线监测

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Extending life span and preventing signs of aging by inhibiting sphingolipid synthesis: A valuable mimic of calorie restriction?

Extending life span and preventing signs of aging by inhibit...

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第一届国际暨第十三次中国生物物理学术大会

作者： Jun liu xinhe Huang Robert Dickson Ke liu Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education College of Life ScienceSichuan University Department of Molecular and Cellular Biochemistry and the Lucille Markey Cancer Center University of Kentucky College of Medicine Lexington KY 40536 USA

＜正＞Sphingolipids are a class of sphingosine-containing lipids which are major components of cellular membrane in all *** sphingolipid synthesis extends chronologic life span and reduces signs of aging of baking yeast Saccharomyces *** studied the effects of myriocin,a specific inhibitor of sphingolipid synthesis,on gene transcription in yeast

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Small-animal SPECT/CT imaging of cancer xenografts and pulmonary fibrosis using a 99mTc-labeled integrin αvβ6-targeting cyclic peptide with improved in vivo stability

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Biophysics Reports 2018年第5期4卷 254-264页

作者： Hao liu Liquan Gao xinhe Yu Lijun Zhong Jiyun Shi Bing Jia Nan Li Zhaofei liu Fan Wang Medical Isotopes Research Center and Department of Radiation Medicine School of Basic Medical Sciences Peking University Health Science Center Medical and Healthy Analytical Center Peking University Key Laboratory of Protein and Peptide Pharmaceuticals CAS Center for Excellence in Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing) Department of Nuclear Medicine Peking University Cancer Hospital & Institute

Integrin αvβ6 is expressed at an undetectable level in normal tissues,but is remarkably upregulated during many pathological processes,especially in cancer and *** imaging of integrin αvβ6 expression using a radiotracer with favorable in vivo pharmacokinetics would facilitate disease diagnosis and therapy *** disulfide-cyclized method,we synthesized in this study,a new integrin avb6-targeted cyclic peptide (denoted as cHK),and radiolabeled it *** ability of the resulting radiotracer99mTc–HYNIC–cHK to detect integrin αvβ6 expression in pancreatic cancer xenografts and idiopathic pulmonary fibrosis was evaluated using small-animal single-photon emission computed tomography (SPECT)/computed tomography (CT).99mTc–HYNIC–cHK showed significantly improved in vivo metabolic stability compared to the linear peptide-based radiotracer99mTc–HYNIC–HK.99mTc–HYNIC–cHK exhibited similar biodistribution properties to99mTc–HYNIC–HK,but the tumorto-muscle ratio was significantly increased (2.99±0.87 vs.1.82±0.27,P\0.05).High-contrast images of integrin avb6-positive tumors and bleomycin-induced fibrotic lungs were obtained by SPECT/CT imaging using99mTc–HYNIC–***,our studies demonstrate that99mTc–HYNIC–cHK is a promising SPECT radiotracer for the noninvasive imaging of integrin αvβ6 in living subjects.

关键词： Integrin αvβ6 Molecular imaging Pancreatic cancer Peptide cyclization Pulmonary fibrosis Single-photon emission computed tomography (SPECT)

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Highly selective methanol-to-olefin reaction on pyridine modified H-mordenite

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Journal of Energy Chemistry 2017年第3期26卷 354-358页

作者： TingHe Guangjin Hou Jinjing Li Xianchun liu Shutao Xu Xiuwen Han xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Department of Chemistry and Biochemistry University of DelawareNewarkDelaware 19716United States

The effects of the acid site in main channels of MOR zeolites on their product selectivity and deactivation in the MTO（methanol to olefin） reactions were investigated. The catalytic analysis demonstrates that the pyridine modified MOR zeolite yielded high selectivity（> 65.3%） of C;-C;, although the conversion dropped from 100% to 54%. Furthermore, both the catalytic lifetime of MOR and the stability of yielding the lower olefins were increased from less than 30 min to more than 120 min after the modification with pyridine.1H MAS NMR on MOR and modified MOR shows that the acid sites in main channel do not benefit the productivity of lower olefins and catalysts’ lifetime. It can be concluded from ex-situ;C CP MAS NMR that the deposit species during the MTO reaction depend on the pore sizes, and the formation of large alkyl aromatic species more likely occurs in the 12-ring main channels rather than the 8-ring side pocket.

关键词： Catalysis Mordenite Pyridine MTO NMR

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