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Influence of oxygen content on hardness of Cr(N,O) thin films deposited by an RF sputtering method

IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： J Shirahata T Ohori H Asami T Suzuki T Nakayama H Suematsu S W Lee Z Fu K Niihara Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Mechanical Engineering Tomakomai national college of Technology 433 Nishikioka Tomakomai 059-1275 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Cr(N,O) thin films were deposited by radio frequency reactive unbalanced magnetron sputtering on Si(100) or glassy carbon substrates. In this paper, the influence of oxygen content on hardness of Cr(N,O) thin films was investigated. The compositional analysis was carried out by Rutherford backscattering spectroscopy. It was found that these thin films contained up to 44at.% of oxygen. Phases in the samples were determined by X-ray diffraction. Cr(N,O) thin films show only peaks based on CrN. The microstructure was observed by utilizing a transmission electron microscope. At <1at.% of oxygen, crystallite size was approximately 100nm. Then, in accordance with increasing of oxygen content, crystallite size was decreased. The hardness of thin films was measured by using a nanoindenter. The micro hardness was changed with varying the oxygen content and the microstructure such as crystallite size. Thus, it was thought that the hardening on Cr(N,O) thin films was caused by solution hardening and/or Hall-Petch relationship.

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Crystalline Porous Organic Salts: Crystalline Porous Organic Salts: From Micropore to Hierarchical Pores (Adv. Mater. 44/2020)

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advanced materials 2020年第44期32卷

作者： Shen Yu Guo‐Long Xing Li‐Hua Chen Teng Ben Bao‐Lian Su Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China Department of Chemistry Jilin University 2699 Qianjin Street Changchun 130012 P. R. China CMI (Laboratory of Inorganic Materials Chemistry) University of Namur 61 rue de Bruxelles Namur B‐5000 Belgium

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Magnetic order in the pseudogap phase of HgBa2CuO4+δ studied by spin-polarized neutron diffraction

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Physical Review B 2011年第22期84卷 224508-224508页

作者： Yuan Li V. Balédent N. Barišić Y. C. Cho Y. Sidis G. Yu X. Zhao P. Bourges M. Greven Department of Physics Stanford University Stanford California 94305 USA Laboratoire Léon Brillouin CEA-CNRS CEA-Saclay F-91191 Gif sur Yvette France T.H. Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA 1. Physikalisches Institut Universität Stuttgart D-70550 Stuttgart Germany BK21 Team and Department of Nano Fusion Technology Pusan National University Miryang 627-706 Republic of Korea School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA State Key Lab of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 China

Spin-polarized neutron diffraction experiments have revealed an unusual q=0 magnetic order in the model high-temperature superconductor HgBa2CuO4+δ (Hg1201) below the pseudogap temperature T* [Y. Li et al., Nature (London) 455, 372 (2008)]. Together with results for the structurally more complex compound YBa2Cu3O6+δ (YBCO) [B. Fauqué et al., Phys. Rev. Lett. 96, 197001 (2006); H.A. Mook et al., Phys. Rev. B 78, 020506 (2008)], this establishes the universal existence of a genuine novel magnetic phase in underdoped cuprates with high maximal Tc (above 90 K at optimal doping). Here we report a systematic study of an underdoped Hg1201 sample (Tc=75 K), the result of which is consistent with the previously established doping dependence of the magnetic signal. We present an assumption-free analysis of all the data available for Hg1201. Depending on how the hole concentration is estimated, comparison with the results for YBCO leads to different scenarios for the competition between the q=0 magnetic order and the spin-density-wave order found in heavily underdoped YBCO.

关键词： NEUTRON diffraction SUPERCONDUCTORS COMPLEX compounds DENSITY wave theory PHASE diagrams

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Corrigendum to "Highly fluorescent copper nanoclusters for sensing and bioimaging" [Biosens. Bioelectron. 154 (2020) 112078]

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Biosensors & bioelectronics 2020年 156卷 112127页

作者： Yu An Ying Ren Michael Bick Aleksandra Dudek Ethan Hong-Wang Waworuntu Jing Tang Jun Chen Baisong Chang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China. Department of Radiology Shengjing Hospital of China Medical University Shenyang 110004 PR China. Department of Bioengineering University of California Los Angeles Los Angeles CA 90095 USA. Department of Materials Science and Engineering Stanford University Stanford CA 94306 USA. Electronic address: jingtang@stanford.edu. Department of Bioengineering University of California Los Angeles Los Angeles CA 90095 USA. Electronic address: jun.chen@ucla.edu. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China. Electronic address: chang@***.

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Large-scale current collectors for regulating heat transfer and enhancing battery safety

Nature Chemical Engineering

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Nature Chemical Engineering 2024年 542-551页

作者： Lun Li Huazhang Zhang Xin Zhao Daping He Wei Shu Zixin Zhang Yu Zhao Xingchuan Li Zongkui Kou Yong Xiao Francis Verpoort Liqiang Mai Jinlong Yang Rui Tan CheeTong John Low Cheng Li Yajun Zhang Hewu Wang Hubei Engineering Research Center of RF-Microwave Technology and Application School of Physics and Mechanics Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing State Key Laboratory of Silicate Materials for Architectures School of Materials Science and Engineering Wuhan University of Technology Wuhan China Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Shenzhen China Department of Chemical Engineering Swansea University Swansea UK Warwick Electrochemical Engineering Group WMG Energy Innovation Centre University of Warwick Warwick UK School of Vehicle and Mobility Tsinghua University Beijing China

Thermal runaway, a major battery safety issue, is triggered when the local temperature exceeds a threshold value resulting from slower heat dissipation relative to heat generation inside the cell. However, improving internal heat transfer is challenged by the low thermal conductivity of metal current collectors (CCs) and challenges in manufacturing nonmetal CC foils at large scales. Here we report a rapid temperature-responsive nonmetallic CC that can substitute benchmark Al and Cu foils to enhance battery safety. The nonmetallic CC was fabricated through a continuous thermal pressing process to afford a highly oriented Gr foil on a hundred-meter scale. This Gr foil demonstrates a high thermal conductivity of 1,400.8 W m−1K−1, about one order of magnitude higher than those of Al and Cu foils. Importantly, LiNi0.8Co0.1Mn0.1O2||graphite cells integrated with these temperature-responsive foils show faster heat dissipation, eliminating the local heat concentration and circumventing the fast exothermic aluminothermic and hydrogen-evolution reactions, which are critical factors causing the thermal failure propagation of lithium-ion battery packs.

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Molecularly Tunable Heterostructured Co-Polymers Containing Electron-Deficient and -Rich Moieties for Visible-Light and Sacrificial-Agent-Free H2O2Photosynthesis

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Angewandte Chemie 2024年第29期136卷

作者： Jingzhao Cheng Wang Wang Jianjun Zhang Sijie Wan Prof. Bei Cheng Prof. Jiaguo Yu Prof. Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences 68 Jincheng Street Wuhan 430078 P. R. China

As an alternative to hydrogen peroxide (H 2 O 2 ) production by complex anthraquinone oxidation process, photosynthesis of H 2 O 2 from water and oxygen without sacrificial agents is highly demanded. Herein, a covalently connected molecular heterostructure is synthesized via sequential C−H arylation and Knoevenagel polymerization reactions for visible-light and sacrificial-agent-free H 2 O 2 synthesis. The subsequent copolymerization of the electron-deficient benzodithiophene-4,8-dione (BTD) and the electron-rich biphenyl (B) and p -phenylenediacetonitrile (CN) not only expands the π-conjugated domain but also increases the molecular dipole moment, which largely promotes the separation and transfer of the photoinduced charge carriers. The optimal heterostructured BTDB-CN 0.2 manifested an impressive photocatalytic H 2 O 2 production rate of 1920 μmol g −1 h −1 , which is 2.2 and 11.6 times that of BTDB and BTDCN. As revealed by the femtosecond transient absorption (fs-TA) and theoretical calculations, the linkage serves as a channel for the rapid transfer of photogenerated charge carriers, enhancing the photocatalytic efficiency. Further, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) uncovers that the oxygen reduction reaction occurs through the step one-electron pathway and the mutual conversion between C=O and C−OH with the anchoring of H + during the catalysis favored the formation of H 2 O 2 . This work provides a novel perspective for the design of efficient organic photocatalysts.

关键词： molecular heterostructure H2O2 dipole moment channel reaction path

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Electrochemical Hydrophobic Tri-layer Interface Rendered Mechanically Graded Solid Electrolyte Interface for Stable Zinc Metal Anode

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Angewandte Chemie 2024年第9期136卷

作者： Dr. Chaozheng Liu Dr. Wangwang Xu Dr. Lei Zhang Daotong Zhang Dr. Weina Xu Dr. Xiaobin Liao Weimin Chen Dr. Yizhong Cao Prof. Mei-Chun Li Prof. Changtong Mei Dr. Kangning Zhao Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing 210000 China Mechanical & Industrial Engineering Department Louisiana State University Baton Rouge LA-70803 USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Dongguan University of Technology Guangdong 523808 China College of Chemistry and Materials Engineering Zhejiang A&F University Hangzhou 311300 China Laboratory of Advanced Separations (LAS) École Polytechnique Fédérale de Lausanne (EPFL) Sion 1950 Lausanne Switzerland

The aqueous zinc-ion battery is promising as grid scale energy storage device, but hindered by the instable electrode/electrolyte interface. Herein, we report the lean-water ionic liquid electrolyte for aqueous zinc metal batteries. The lean-water ionic liquid electrolyte creates the hydrophobic tri-layer interface assembled by first two layers of hydrophobic OTF − and EMIM + and third layer of loosely attached water, beyond the classical Gouy–Chapman–Stern theory based electrochemical double layer. By taking advantage of the hydrophobic tri-layer interface, the lean-water ionic liquid electrolyte enables a wide electrochemical working window (2.93 V) with relatively high zinc ion conductivity (17.3 mS/cm). Furthermore, the anion crowding interface facilitates the OTF − decomposition chemistry to create the mechanically graded solid electrolyte interface layer to simultaneously suppress the dendrite formation and maintain the mechanical stability. In this way, the lean-water based ionic liquid electrolyte realizes the ultralong cyclability of over 10000 cycles at 20 A/g and at practical condition of N/P ratio of 1.5, the cumulated areal capacity reach 1.8 Ah/cm 2 , which outperforms the state-of-the-art zinc metal battery performance. Our work highlights the importance of the stable electrode/electrolyte interface stability, which would be practical for building high energy grid scale zinc-ion battery.

关键词： Electrochemical Tri-Layer Interface Hydrophobic Ionic Liquid Mechanically Graded Solid Electrolyte Interface Zinc Battery

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[email protected] core-shell nanowires towards oxygen reduction reaction

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Chemical Engineering Journal 2021年 421卷

作者： Qi Xue Hui-Ying Sun Ya-Nan Li Ming-Jun Zhong Fu-Min Li Xinlong Tian Pei Chen Shi-Bin Yin Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education) Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an 710062 PR China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine Chemistry School of Chemical Engineering and Technology Hainan University Haikou 570228 PR China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Nanning Guangxi 530004 PR China

Noble metal based one-dimensionally (1D) bimetallic nanostructures are attracting increasing interest in energy conversion field because of their structural advantages and tunable chemical composition. At present, the facile and efficient synthesis of high-quality Au-core noble metal-shell nanowires still maintains the challenge. Herein, we develop a feasible one-pot chemical-reduction strategy to rapidly synthesize high-quality [email protected] core–shell nanowires ( [email protected] CSNWs) in 1-naphthol ethanol solution and explore their potential application in electrocatalysis. Expermattial results show the formation core–shell structure originates from the deposition-growth of Ir atoms at preferentially generated Au nanowires surface. When using as an electrocatalyst towards oxygen reduction reaction (ORR) in alkaline media, [email protected] CSNWs show Pt-like ORR electroactivity due to the compositional synergism effect and structural advantages of 1D nanowires, accompanying with excellent durability and extremely enhanced methanol tolerance towards ORR.

关键词： Low temperature fuel cells Pt-free electrocatalyst Core-shell structure Methanol tolerance Oxygen reduction reaction

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Enhancement of the Critical Temperature of HgBa2CuO4+δ by Applying Uniaxial and Hydrostatic Pressure: Implications for a Universal Trend in Cuprate Superconductors

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Physical Review Letters 2010年第16期105卷 167002-167002页

作者： F. Hardy N. J. Hillier C. Meingast D. Colson Y. Li N. Barišić G. Yu X. Zhao M. Greven J. S. Schilling Institute for Solid State Physics Karlsruhe Institute of Technology P.O. Box 3640 76021 Karlsruhe Germany Department of Physics Washington University CB 1105 One Brookings Drive St. Louis Missouri 63130 USA Service de Physique de l’Etat Condensé Orme des Merisiers CEA Saclay CNRS URA 2464 91195 Gif-Sur-Yvette Cedex France Department of Physics Stanford University Stanford California 94305 USA T.H. Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA I. Physikaliches Institut Universität Stuttgart 70550 Stuttgart Germany School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA State Key Lab of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 China

It is well known that the superconducting transition temperature (Tc) of cuprate superconductors can be enhanced by varying certain structural and electronic parameters, such as the flatness of the CuO2 planes or their doping level. We determine the uniaxial and hydrostatic pressure derivatives of Tc in the structurally simple tetragonal compound HgBa2CuO4+δ near optimal doping. Our results provide experimental evidence for two further methods to enhance Tc: (i) reducing the area of the CuO2 planes, and (ii) increasing the separation of the CuO2 planar groups. Tc is found to couple much more strongly to the ratio c/a of the lattice constants than to the unit cell volume. A comparison with prior results for structurally more complicated cuprates reveals a general trend of uniaxial pressure derivatives with Tc.

关键词： Hydrostatic pressure

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Front Cover: Highly Dispersed Pt Nanoparticles Embedded in N-Doped Porous Carbon for Efficient Hydrogen Evolution (Chem. Asian J. 14/2021)

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Chemistry – An Asian Journal 2021年第14期16卷

作者： Yuan Dong Dr. Jie Ying Yu-Xuan Xiao Jiang-Bo Chen Prof. Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 P. R. China School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA

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