摘要：
Gradient nano-grained (GNG) structure has been developed to solve the notable dilemma of the strength-ductility. However, the surface plastic strain-induced grain refinement often results in cracking or peeling of materials when overloaded. This study proposed a bending compensated surface mechanical grinding treatment (BC-SMGT) for thin metallic sheets, where the elastic bending dynamically compensates the perpendicular indentation-induced penetration. This unique deformation feature results in gradient nanostructured layers, with a grain size ranging from similar to 80 nm to a few microns in a pure Cu sheet processed at both room temperature (RT) and cryogenic temperature (CT). A relatively thicker deformation layer and smaller top surface grain size in the CT Cu sample yields better strength-ductility synergy than that in the RT Cu sample, which benefits from the preserved nanograins. Our results advance the fundamental understanding of this newly developed deformation technique and enlighten the future application of GNG structures in metallic sheets at industrial scale.
通讯机构：
[Yonggang Tong] C;[Zhihai Cai] N;National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China<&wdkj&>College of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China
摘要：
h-BN solid lubricant is added for reinforcing the wear resistance and strength of CoCrNi medium entropy alloy (MEA). However, the poor wettability of h-BN with alloy substrates limits its engineering application. Herein, core-shell structured h-BN@Ni powders were prepared to improve the wettability of h-BN and CoCrNi MEA matrix. Specifically, h-BN@Ni powders were manufactured by a new electroless plating method with silver ni-trate activation. The results indicate that the effect of using silver nitrate is comparable to or even superior to that of palladium or ChCl-EG ionic liquid additive, while the cost required to prepare h-BN@Ni powders is much lower than the other two. Further, CoCrNi-based self-lubricating composites were prepared by powder metal-lurgy. The results demonstrate that the nickel coating improves the wettability between h-BN and CoCrNi matrix, resulting the enhanced strength, plasticity and wear resistance of CoCrNi/BN@Ni. Specifically, the yield and tensile strengths of CoCrNi/BN@Ni MEA are about 15.0 % and 14.7 % higher than CoCrNi MEA, respectively. The strain of CoCrNi/BN@Ni MEA is approximately 12 % and 19 % higher than that of CoCrNi/BN MEA and CoCrNi MEA, respectively. Moreover, CoCrNi/BN@Ni MEA has a lower wear rate than the other two by about 26.4 %, and the hardness of CoCrNi composites with h-BN or h-BN@Ni is about 11.8 % higher than CoCrNi MEA.
摘要：
The study reports the effects of Ti content on microstructures, mechanical properties and corrosion behavior of the TixZrNb alloys. The BCC phase TixZrNb (x = 1, 1.5 and 2 mol) alloys have a typical dendritic morphology. With the increase of Ti content, the dendrite arms grow up, and the area of the inter-dendritic zone decreases. Furthermore, the segregation of Zr elements forms the beta(Zr) phase. Ti1ZrNb alloy has the highest yield strength of 516 MPa and hardness of 254 HV, and the Ti1.5ZrNb alloy shows the best elastic deformation performance (n = 0.46). The potentiodynamic polarization curve and electrochemical impedance spectroscopy show that Ti1.5ZrNb alloy has better electrochemical corrosion behavior than other alloys in 3.5 wt.% NaCl solution at 25 degrees C. The cyclic polarisation curve shows that Ti2ZrNb alloy is more prone to pitting corrosion in 3.5 wt.% NaCl solution. (C) 2022 The Author(s). Published by Elsevier B.V.
作者机构：
[Li, Guang; Wang, Xianyou; Zheng, Liping; Yang, Juan; Yu, Hao; Zeng, Junqing; Chen, Yulian] Xiangtan Univ, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Hunan Prov Key Lab Electrochem Energy St, Xiangtan 411105, Hunan, Peoples R China.;[Chang, Baobao] Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450001, Henan, Peoples R China.;[Wu, Chun] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Guo, Xiaowei; Chen, Gairong] Xinxiang Coll, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China.
通讯机构：
[Zheng, L.; Wang, X.] N;National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Hunan, Xiangtan, China
通讯机构：
[Wenzhi Huang] S;[Ling Zhu] H;Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, PR China<&wdkj&>Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Chemical Engineering, Changsha University of Science & Technology, Changsha 410114, PR China
摘要：
The aim of the current study was to optimize the mechanical properties and thermal shock resistance of plasma-sprayed LaPO4/8YSZ coatings with thickness of 1 mm based on a modified Vickers indentation method. As the LaPO4 content increased from 1 wt% to 30 wt%, the increasing porosity of the composite coatings led to the decrease of bonding strength of the coatings from 8.43 +/- 0.29 MPa to 6.08 +/- 0.12 MPa, while residual stress and fracture toughness of the composite coatings exhibited an increased tendency. Although the bonding strength of LaPO4/8YSZ coatings was lower than that of 8YSZ coating (11.49 +/- 0.19 MPa), the minimum residual stress of-(51.83 +/- 3.38) MPa for the coating with LaPO4 content of 1 wt% was obtained, further resulting in the maximum thermal cycling lifetime of 5340 +/- 49 cycles during thermal shock test at 900 degrees C. Correspondingly, thermal shock resistance was strongly dependent on the microstructure and mechanical properties of LaPO4/8YSZ coatings with the addition of nano-LaPO4 particles. (C) 2022 Elsevier B.V. All rights reserved.
作者：
Ma, Dongwei;Lai, Linyunuo;de Leon, Carlos Ponce;Yuan, Du;Pan, Jia Hong
期刊：
Sustainable Materials and Technologies,2022年32:e00419 ISSN：2214-9937
通讯作者：
Jia Hong Pan
作者机构：
[Ma, Dongwei; Pan, Jia Hong; Lai, Linyunuo] North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China.;[de Leon, Carlos Ponce] Univ Southampton, Fac Engn & Phys Sci, Southampton SO17 1BJ, England.;[Yuan, Du] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Jia Hong Pan] M;MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
摘要：
Mesoporous anatase TiO2 spheres (MATS) are elaborated via microwave-assisted rapid crystallization of hydrous TiO2 colloidal spheres (HTCS) self-template. Tuning the hydrothermal and calcination temperatures allow for textural property-controllable synthesis. The optimal MATS are demonstrated as a promising cathode material of aluminium-ion batteries (AIBs) and show superior rate and capacity performances. Their large surface area and porous structure offer a robust and interconnected scaffold for Al3+ insertion/exertion with higher reversibility. The constructed non-aqueous AIBs with RTILs electrolyte deliver the highest initial capacity of 145.3 mA h g(-1) at 0.2C with high Coulombic efficiency of asymptotic to 96.5%, and a reversible capacity of 78.0 mA h g(-1) at 1C can be retained after 200 cycles with high Coulombic efficiency of asymptotic to 98.6%. Our study on the Al storage mechanism further shows the charge/discharge process involves the extraction/insertion of Al species (Al3+, AlCl4-, Al2Cl7-, etc.) into the TiO2 crystal lattices with the formation of intermediate aluminium titanium oxides (Al2Ti7O15 and Al2TiO5) and non-oxides (Ti(AlCl4)(2) and Ti(ClO4)(4)). The continuous enrichment of the latter during cycling greatly deteriorates the reversibility of AIBs.
通讯机构：
[Wenbin Luo; Zisheng Chao] S;School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
作者机构：
[Yi, Hongling; Wang, Chu; Zhao, Zixiang; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.;[Tan, Lei] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Changsha 410114, Peoples R China.;[Yi, Xiaoli; Zheng, Junchao; Wang, Jiexi] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Zhou, Youyuan] Hunan Changyuan Lico Co Ltd, Changsha 410205, Peoples R China.
通讯机构：
[Lingjun Li] S;School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, China
关键词：
Li-ion batteries;Co-free Ni-rich cathodes;residual Li conversion;cation ordering
摘要：
The residual Li and Li~+/Ni~(2+) cation mixing play essential roles in the electrochemical properties of Ni-rich cathodes.However,a general relationship between the residual Li conversion,cation mixing,and their effects on the Li~+ kinetics and structural stability has yet to be established,due to the presence of cobalt in the cathode.Here,we explore the synergistic impact of the residual Li conversion and cation ordering on a Co-free Ni-rich cathode (i.e.,LiNi_(0.95)Mn_(0.05)O_2).It discloses that the rate capability is mainly affected by residual Li contents and operating voltage.Specificalty,residual Li can be electrochemically converted to cathode electrolyte interphase (CEI) below 4.3 V,thus inducing high interphase resistance,and decomposes to produce CO_2-dominated gas at 4.5 V,causing temporary enhancement of Li~+ diffusivity but severe surface degradation during cycling.Moreover,the cycling performance of Co-free Ni-rich cathode is not only determined by Li~+/Ni~(2+) cation-ordered superlattice,which enhances the structural stability as it functions as the pillar to impede lattice collapse at a highly charged state,but also by the robust CEI layers which protect the bulk from electrolyte attack under 4.3 V.These findings promote an in-depth understanding of residual Li conversion and Li~+/Ni~(2+) cation ordering on Co-free Ni-rich cathode.
作者机构：
[Chen, Zibo; Zhao, Jin; Chen, Jianyu; Li, Mingshi; Ma, Yanwen; Feng, Shan; He, Qian] Nanjing Univ Posts & Telecommun, State Key Lab Organ Elect & Informat Displays, Nanjing 210023, Peoples R China.;[Chen, Zibo; Zhao, Jin; Chen, Jianyu; Li, Mingshi; Ma, Yanwen; Feng, Shan; He, Qian] Nanjing Univ Posts & Telecommun, Inst Adv Mat LAM, Nanjing 210023, Peoples R China.;[Wang, Yizhou; Alshareef, Husam N.] King Abdullah Univ Sci & Technol KAUST, Mat Sci & Engn, Thuwal 239556900, Saudi Arabia.;[Yuan, Du] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Jin Zhao; Yanwen Ma] S;[Husam N. Alshareef] M;Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia<&wdkj&>State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
通讯机构：
[Chuansheng Chen] S;School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, 410114, China
关键词：
Graphene oxide;ZnO nanorod;Ternary hybrids;Microwave radiation;Photocatalytic hydrogen production
摘要：
In order to further improve the photocatalytic H-2 production ability of CdS/single crystal ZnO nanorod heter-ostructure (CZ), graphene oxide/CdS/single crystal ZnO nanorod hybrid (GCZ) were synthesized by microwave -assisted co-precipitation method, and the influence of graphene oxide (GO) content on the properties of ternary materials was tested. Experimental results exhibit that GO further enhance the photocatalytic H-2 production capacity of CZ material. When GO wt% is 2.91%, the as-prepared products have the best photocatalytic H-2 production capacity, which its average H-2 production rate is 6.511 mmol g(-1) h(-1). The enhancement for H-2 production capacity benefits from increasing specific surface area, reducing bandgap energy of ZnO and accel-erating the migration rate of photo-induced carriers due to the superior property of GO and building efficient heterojunction between ZnO and CdS.
摘要：
Developing a highly stable and high-efficiency catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical to developing Zinc-air battery. In this work, a facile strategy was applied to prepared Ag-CeO2-Co3O4/C dual-functional catalyst. The interface interaction affecting the electronic structure and valence state of Ag, Ce and Co, significantly facilitates the ORR/OER catalytic activity. For the Ag-CeO2-Co3O4/C catalyst, the half-wave potential is 0.80 V and limiting current density is 6.2 mA cm(-2) in ORR, while the overpotential is 340 mV s(-1) at 10 mA cm(-2) in OER. The maximum power density in Zn-air battery is 178 mW cm(-2) at 300 mA cm(-2). The relationship between interface interaction and catalytic activity provides guidance for developing multiple catalysts.
