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A class of Ga-Al-P-based compounds with disordered lattice as advanced anode materials for Li-ion batteries

Journal of Energy Chemistry 2023年第4期79卷 12-21页

作者： Yanhong Li Peixun Xiong Lei Zhang songliu yuan Wenwu Li School of Physics Huazhong University of Science and TechnologyWuhan 430074HubeiChina School of Chemical Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon 440-746Republic of Korea School of Materials Science&Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Phosphides possess large reversible capacity, small voltage hysteresis, and high energy efficiency, thus promising to be new anode candidates to replace commercial graphite for Li-ion batteries(LIBs).Through a facile mechanochemistry method, we prepare a novel ternary phosphide of Ga0.5Al0.5P whose crystalline structure is determined to be a cation-disordered cubic zinc sulfide structure according to XRD refinement. As an anode for LIBs, the Ga0.5Al0.5P delivers a reversible capacity of 1,352 mA h g^(-1)at100 mA g^(-1)with an initial Coulombic efficiency(ICE) up to 90.0% based on a reversible Li-storage mechanism integrating intercalation and subsequent conversion processes as confirmed by various characterizations techniques including in-situ XRD, ex-situ Raman, and XPS and electrochemical ***-modified Ga0.5Al0.5P exhibits a long-lasting cycling stability of retaining 1,182 mA h g^(-1)after300 cycles at 100 m A g^(-1), and 625 mA h g^(-1)after 800 cycles at 2,000 mA g^(-1), and a high-rate performance of remaining 342 m A h g^(-1)at 20,000 mA g^(-1). The outstanding electrochemical performances can be attributed to enhanced reaction kinetics enabled by the capacitive behaviors and the faster Liion diffusion enabled by the cation-mixing. Importantly, by tuning the cationic ratio, we develop a novel series of cation-mixed compounds of Ga_(1/3)Al_(2/3)P, Ga_(1/4)Al_(3/4)P, Ga_(1/5)Al_(4/5)P, Ga_(2/3)Al_(1/3)P, Ga_(3/4)Al_(1/4)P, and Ga_(4/5)Al_(1/5)P, which demonstrate large capacity, high ICE, and suitable anode potentials. Broadly, these compounds with disordered lattices probably present novel physicochemical properties, and high electrochemical performances, thus providing a new perspective for new materials design.

关键词： Multinary phosphides Disordered lattice Anode Li-ion batteries

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Single-Phase Ternary Compounds with a Disordered Lattice and Liquid Metal Phase for High-Performance Li-Ion Battery Anodes

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Nano-Micro Letters 2023年第5期15卷 36-50页

作者： Yanhong Li Lei Zhang Hung-Yu Yen Yucun Zhou Gun Jang songliu yuan Jeng-Han Wang Peixun Xiong Meilin Liu Ho Seok Park Wenwu Li School of Chemical Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-SiGyeonggi-Do 440-746Korea School of Physics Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Department of Chemistry National Taiwan Normal UniversityTaipei 11677TaiwanPeople’s Republic of China Samsung Advanced Institute for Health Sciences and Technology(SAIHST) Sungkyunkwan University2066 SeoburoJangan-guSuwon 440-746Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066 SeoburoJangan-guSuwon 440-746Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan University2066 SeoburoJangan-guSuwon 440-746Korea

Si is considered as the promising anode materials for lithium-ion batteries(LIBs)owing to their high capacities of 4200 mAh g-1and natural ***,severe electrode pulverization and poor electronic and Li-ionic conductivities hinder their practical *** resolve the afore-mentioned problems,we first demonstrate a cation-mixed disordered lattice and unique Li storage mechanism of single-phase ternary GaSiP_(2)compound,where the liquid metallic Ga and highly reactive P are incorporated into Si through a ball milling *** confirmed by experimental and theoretical analyses,the introduced Ga and P enables to achieve the stronger resistance against volume variation and metallic conductivity,respectively,while the cation-mixed lattice provides the faster Li-ionic diffusion capability than those of the parent GaP and Si *** resulting GaSiP_(2)electrodes delivered the high specific capacity of 1615 mAh g-1and high initial Coulombic efficiency of 91%,while the graphite-modified GaSiP_(2)(GaSiP_(2)@C)achieved 83%of capacity retention after 900 cycles and high-rate capacity of 800 at 10,000 mA ***,the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)//Ga SiP_(2)@C full cells achieved the high specific capacity of 1049 mAh g-1after 100 cycles,paving a way for the rational design of high-performance LIB anode materials.

关键词： Multinary compounds Liquid metal GaSiP_(2) Disordered lattice Li-ion batteries

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Effects of Pr on the structure and magnetic properties of FePt alloys

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Rare Metals 2007年第1期26卷 19-22页

作者： CHENG Gang GU Zhengfei ZGOU Huaiying CHENG Jun yuan songliu Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Information Materials Science and Engineering Guilin University of Electronic Technology Guilin 541004 China

The effects of Pr on the structure and magnetic properties of PrxFe60.5-xPt39.5 alloys （x = 0, 0.5, 1.0, and 1.5） were investigated. X-ray diffraction data indicated that the phase transition temperature of FePt based alloys from disordered face-centered-cubic to ordered face-centered-tetragonal cubic decreases with the increase in Pr concentration. Pr plays the role of a grain refiner and it can enhance the exchange coupling between soft magnetic phase and hard magnetic phase. The results indicate that the replacement of Fe by Pr can significantly improve the remanence and coercivity of the Fe60.5Pt39.5 alloy. These results can be explained on the basis of phase transformation and microstructure. Both the remanence ratio and coercivity of the FePt based alloy as a function of the Pr content are increased by the optimum addition of 0.5 at.% Pr.

关键词： phase transformation exchange coupling anisotropy constant Fe-Pt based alloys

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Memory Effect up to Room-temperature in Ni/Ni_2P Core-shell Structured Nanoparticles

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 467-470页

作者：段寒凝 yuan songliu ZHENG Xianfeng TIAN Zhaoming School of Physics Huazhong University of Science and Technology

Memory effect has been studied in the system using magnetic nanoparticles with Ni nanocore encapsulated by non-magnetic and oxidation-resistant Ni2P nanoshell acquired through surface-phosphatizing Ni nanoparticles. The self-assembled array with interparticle spacing of about 6 nm shows memory effect up to 200 K below its average blocking temperature of 260 K. And reducing the interparticle spacing of the self-assembled array via annealing can further enlarge the temperature range of memory effect up to room-temperature. The memory effect can be understood based on the thermal relaxation theory of single-domain magnetic nanoparticles. Furthermore, the read-write magnetic coding is realized based on the temperature changes, using the memory effect up to room-temperature, which may be useful for future memory devices.

关键词： core-shell magnetic nanoparticles memory effect

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Self-Supported Nanoporous Gold with Gradient Tin Oxide for Sustainable and Efficient Hydrogen Evolution in Neutral Media

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Journal of Renewable Materials 2020年第2期8卷 133-151页

作者： Xianglong Lu Tianshui Yu Hailing Wang Ruichun Luo Pan Liu songliu yuan Lihua Qian School of Physics Huazhong University of Science and TechnologyWuhan430074China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200030China

Hydrogen evolution reaction(HER)in neutral medium suffers from slow kinetics as compared to that in alkaline or acidic conditions,owing to larger Ohmic loss and low proton *** we report that a self-supported nanoporous Au-SnO_(x)(NP Au-SnO_(x))catalyst with gradient tin oxide surface could significantly enhance HER activity in neutral buffer solution(0.2 M PBS).The NP Au-SnO_(x)catalyst exhibits a low onset overpotential of 38 mV and a small Tafel slope of 79 mV dec^(−1).The current density of 10 mA cm^(−2)is manifested at an overpotential as low as 148 mV,representing the comparable performance of Pt/C *** high catalytic activity can retain at least 10 hours without any detectable *** superior HER activity is proposed to originate from the gradient SnO_(x)structure and metal/oxide interfaces in nanoporous ***,the X-ray photoelectron spectroscopy reveals that the gradient oxide in the ligament is remarkably stable during long-term reaction.

关键词： Nanoporous metals electrocatalysts hydrogen evolution reaction neutral electrolyte gradient oxide structure

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Electrical Transport and Magnetic Properties of La_(0.67)Ca_(0.33)Mn_(1-x)Cr_xO_3 and La_(0.67+x)Ca_(0.33-x)Mn_(1-x)Cr_xO_3(0.04≤x≤0.08)

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 463-466页

作者： XIAO Xun yuan songliu YIN Shiyan CHEN Ling REN Guangming MIAO Juhong YU Gongqi School of Physics Science and Technology Yangtze University Jingzhou 434023 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

A comparative study for two different series, La0.67Ca0.33Mn1-xCrxO3 and La0.67＋xCa0.33-x Mn1-xCrxO3 is performed with x changing from 0.04 to 0.08 through measurements of zero-field resistivity （p）, magnetoresistance （MR） and ac susceptibility （Z） as functions of temperature （T）. For the second group, a single insulator-metal transition was characterized by the resistivity maximum appears in p vs. T curve. For the first group, besides the resistivity peak appearing at higher temperatures, the sample shows evidence for the existence of another peak appearing at lower temperatures. Compared to the first group, the second group shows a significant enhancement in MR effect, while the measurement ofΧ-T dependence does not display obvious differences for the two series. Different behaviors observed in the two series are discussed by considering possible exchange interaction between Mn^3- ion and Cr^3- ion.

关键词： perovskite manganites double exchange metal-insulator transition colossal magnetoresistance

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Nanoporous Au-Sn with solute strain for simultaneously enhanced selectivity and durability during electrochemical CO2 reduction

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Journal of Materials Science & Technology 2020年第8期36卷 154-160页

作者： Xianglong Lu Tianshui Yu Hailing Wang Lihua Qian Ruichun Luo Pan Liu Yao Yu Lin Liu Pengxiang Lei songliu yuan School of Physics Huazhong University of Science and TechnologyWuhan430074China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200030China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan430074China School of Chemistry and Chemical Engineering Hubei University of TechnologyWuhan430068China

Electrochemical carbon dioxide reduction meditated by metallic catalysts suffers from restricted selectivity and competition from hydrogen evolution, which sensitively depends on ambiguous contributions of alloying and strain state in bimetallic catalysts. Herein, nanoporous Au-Sn(NPAS) containing trace tin solute in Au lattices is delicately designed to convince real strain effect, while eliminating other undesirable factors, such as alloying, crystal facets and surface composition. Compared with nanoporous gold(NPG), the NPAS with a solute strain of ~2.2% enables more efficient CO2-to-CO conversion, with an efficiency as high as 92% at-0.85 V versus reversible hydrogen electrode(vs. RHE), and the high activity can retain for more than 8 h. The combination of HRTEM and surface valence band photoemission spectra reveals that the tensile strain on the surface of 3 D nanoporous structure promotes the catalytic activity by shifting up the d-band center and strengthening the adsorption of key intermediate *COOH. A small amount of Sn solute in the nanoporous alloy can prevent ligament coarsening effectively and improve the electrochemical stability.

关键词： Nanoporous metals Electrocatalysts Electrochemical carbon dioxide reduction Strain effect

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Ultrasensitive strain gauge with tunable temperature coefficient of resistivity

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Nano Research 2016年第5期9卷 1346-1357页

作者： Lizhi Yi Weihong Jiao Changming Zhu Ke Wu Chao Zhang Lihua Qian Shuai Wang Yingtao Jiang songliu yuan School of Physics Huazhong University of Science and Technology Wuhan 430074 China Flexible Electronics Research Center Huazhong University of Science and Technology Wuhan 430074 China School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Nevada Nanotechnology Center & Department of Electrical and Computer Engineering University of Nevada Las Vegas Nevada 89154-4026 USA

We demonstrate an ultrasensitive strain gauge based on a discontinuous metal film with a record detection limit as low as 8.3 × 10^-6. Constructed by well-tunable crevices on the nanometer scale within the film, this gauge exhibits an ultrafast dynamic response to vibrations with a frequency range of 1 Hz to 10 kHz. More importantly, the temperature coefficient of resistivity （TCR） of the metal film is tunable owing to the cancellation effect caused by the possibility of tunneling across the nanoscale crevices （showing a negative temperature dependence） and the electron conduction within the metal islands （showing a positive temperature dependence）. Consequently, a nullified TCR is achievable when the crevice size can be precisely controlled. Thus, a fabrication strategy to precisely control the nanoscale crevices was developed in this study through the real-time tracking of the electrical conductivity during thermal evaporation. The ultrasensitive strain gauge with a tunable thermal drift introduces numerous opportunities for precision devices and wearable electronics with superior reliability.

关键词： strain gauge flexible gauge Au nanoparticle sound-wave detection radial-artery detection electron tunneling

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Controllable defects implantation in MoS2 grown by chemical vapor deposition for photoluminescence enhancement

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Nano Research 2018年第8期11卷 4123-4132页

作者： Ke Wu Zhe Li Jibo Tang Xianglong Lv Hailing Wang Ruichun Luo Pan Liu Lihua Qian Shunping Zhang songliu yuan School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Physics and Technology Center for Nanoscience and Nanotechnology and Key Laboratory of Artificial Micro- nndIVano-Structures of Ministry of Education Wuhan University Wuhan 430072 China The Institute for Advanced Studies Wuhan University Wuhan 430072 China Flexible Electronics Research Center Huazhong University of Science and Technology Wuhan 430074 China Department of Materials Science and Engineering Shanghai Jiaotong University Shanghai200240 China

Photoluminescence （PL） of transition metal dichalcogenides （TMDs） can be engineered by controlling the density of defects, which provide active sites for electron-hole recombination, either radiatively or non-radiatively. However, the implantation of defects by external stimulation, such as uniaxial tension and irradiation, tends to introduce local damages or structural non-homogeneity, which greatly degrades their luminescence properties and impede their applicability in constructing optoelectronic devices. In this paper, we present a strategy to introduce a controllable level of defects into the MoS2 monolayers by adding a hydrogen flow during the chemical vapor deposition, without sacrificing their luminescence characteristics. The density of the defect is controlled directly by the concentration of hydrogen. For an appropriate hydrogen flux, the monolayer MoS2 sheets have three times stronger PL emission at the excitonic transitions, compared with those samples with nearly perfect crystalline structure. The defect-bounded exciton transitions at lower energies arising in the defective samples and are maximized when the total PL is the strongest. However, the B exciton, exhibits a monotonic decline as the defect density increases. The Raman spectra of the defective MoS2 reveal a redshift （blueshift） of the in-plane （out-of-plane） vibration modes as the hydrogen flux increases. All the evidence indicates that the generated defects are in the form of sulfur vacancies. This study renders the high-throughput synthesis of defective MoS2 possible for catalysis or light emitting applications.

关键词： chemical vapor deposition(CVD) MoS2 hydrogen,sulfur vacancy defect-bounded exciton photoluminescenceenhancement,Raman shifts

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Closely packed nanoparticle monolayer as a strain gauge fabricated by convective assembly at a confined angle

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Nano Research 2014年第6期7卷 824-834页

作者： Chao Zhang Juan Li Shanshan Yang Weihong Jiao Shuang Xiao Mingqing Zou songliu yuan Fei Xiao Shuai Wang Lihua Qian School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China

The reliability and sensitivity of a strain gauge made from a nanoparticle monolayer intrinsically depend on electron tunneling between the adjacent nanoparticles, so that creating nanoscale interstitials with uniform distribution and tuning the interparticle separation reversibly during cyclic mechanical stress are two vital issues for performance enhancement. In this work, one assembly technique is initialized to fabricate parallel nanoparticle strips by precisely tailoring the contact angle of a gold colloid on a substrate. The assembly of a nanoparticle monolayer with a close-packed pattern can be simultaneously switched on and off by independently varying the contact angle across a threshold value of 4.2°. This nanoparticle strip shows a reversible and reliable electrical response even if a mechanical strain as small as 0.027% is periodically supplied, implying well-controlled electron tunneling between the adjacent nanoparticles.

关键词：纳米粒子单层应变计组装对流密闭排列电子隧穿

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