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MoSe2 nanosheets as a functional host for lithium-sulfur batteries

能源化学 2020年第8期47卷 241-247页

作者： Lishun Meng Yuan Yao Jing Liu Zhao Wang Dong Qian Liuchun Zheng Bao-Lian Su Hong-En Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hunan Provincial Key Laboratory of Chemical Power Resources College of Chemistry and Chemical Engineering Central South University Changsha 410083 Hunan China Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China College of Physics and Electronics Information Yunnan Normal University Kunming 650500 Yunnan China

Lithium-sulfur batteries (LSBs) hold great potential for large-scale electrochemical energy storage ***,the shuttle of soluble lithium polysulfide (LiPSs) intermediates with sluggish conversion kinetics and random deposition of Li2S have severely degraded the capacity,rate and cycling performances of LSBs,preventing their practical *** this work,ultrathin MoSe2 nanosheets with active edge sites were successfully grown on both internal and external surfaces of hollow carbon spheres with mesoporous walls (MCHS).The resulting MoSe2@MCHS composite acted as a novel functional reservoir for LiPSs with high chemical affinity and effectively mediated their fast redox conversion during charge/discharge as elucidated by experimental observations and first-principles density functional theory (DFT) *** as-fabricated Li-S cells delivered high capacity,superior rate and excellent *** current work presents new insights on the delicate design and fabrication of novel functional composite electrode materials for rechargeable batteries with emerging applications.

关键词： MoSe2 Cathode host Lithium-sulfur batteries Shuttle effect Electrochemistry Density functional theory

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Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

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Chemistry of materials 2023年第20期35卷 8529-8539页

作者： Fei Yu Yu-Xuan Xiao Jiang-Bo Chen Ge Tian Xiong Yang Fu-Fei Pu Jin-Yi Ouyang Kenneth I. Ozoemena Mark D. Symes Roberto M. Torresi Fazhou Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & State Key Laboratory of Silicate Materials for Architectures & Shenzhen Research Institute School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China Molecular Sciences Institute School of Chemistry University of the Witwatersrand Johannesburg 2050 South Africa WestCHEM School of Chemistry University of Glasgow Glasgow G12 8QQ United Kingdom Departamento de Química Fundamental Instituto de Química Universidade de São Paulo Av. Lineu Prestes 748 São Paulo 05508000 Brazil

Optimization of the electronic structure and surface physicochemical properties of PtNi nanoalloys by incorporation of sulfur (S) is an effective strategy for improving the efficiency of the electrocatalytic hydrogen evolution reaction (HER). However, few studies have been carried out to assess the seawater electrocatalytic performance of PtNi by incorporation of interfacial S from CdS nanocrystals. In this study, a simple method is developed to prepare CdS/PtNi, composed of a PtNi alloy supported with CdS quantum dots (QDs). Experimental data demonstrate that interfacial S-sensitization enhances the electron density of PtNi nanoalloy in CdS/PtNi. Therefore, CdS/PtNi exhibits superior performance toward HER in seawater. Specifically, CdS/PtNi displays a low overpotential of 22 mV at a current density of 10 mA cm–2, a higher specific activity of 24.7 mA cm–2at −0.07 V, and superior durability in seawater, all of which metrics exceed those of commercial Pt/C. Theoretical calculations provide additional evidence that interfacial S-sensitization of PtNi alloy raises electron densities, lowers the d-band center, facilitates water molecule adsorption, resistances to Cl–, and reduces the hydrogen adsorption Gibbs free energy of PtNi alloy. This study provides new opportunities for the design of efficient and stable electrocatalysts for large-scale production of hydrogen from seawater.

关键词： Alloys Cadmium sulfide Evolution reactions Platinum Seawater

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Reliable synthesis of Large-Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation

arXiv

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arXiv 2023年

作者： Zhang, Qianhui Lu, Jianfeng Wang, Ziyu Dai, Zhigao Zhang, Yupeng Huang, Fuzhi Bao, Qiaoliang Duan, Wenhui Fuhrer, Michael S. Zheng, Changxi Department of Civil Engineering Monash University ClaytonVIC3800 Australia School of Chemistry Monash University ClaytonVIC3800 Australia Department of Material Science and Engineering Monash University ClaytonVIC3800 Australia State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Monash Centre for Atomically Thin Materials Monash University ClaytonVIC3800 Australia Monash University ClaytonVIC3800 Australia

Two-dimensional (2D) transition metal dichalcogenides (TMDs) hold great potential for future low-energy optoelectronics owing to their unique electronic, optical, and mechanical properties. Chemical vapor deposition (CVD) is the technique widely used for the synthesis of large-area TMDs. However, due to high sensitivity to the growth environment, reliable synthesis of monolayer TMDs via CVD remains challenging. Here we develop a controllable CVD process for large-area synthesis of monolayer WS2 crystals, films, and in-plane graphene-WS2 heterostructures by cleaning the reaction tube with hydrochloric acid, sulfuric acid and aqua regia. The concise cleaning process can remove the residual contaminates attached to the CVD reaction tube and crucibles, reducing the nucleation density but enhancing the diffusion length of WS2 species. The photoluminescence (PL) mappings of a WS2 single crystal and film reveal that the extraordinary PL around the edges of a triangular single crystal is induced by ambient water intercalation at the WS2-sapphire interface. The extraordinary PL can be controlled by the choice of substrates with different wettabilities. Copyright © 2023, The Authors. All rights reserved.

关键词： Chemical vapor deposition

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Research on the Bonding Properties of Vitrified Bonds with Porous Diamonds and the Grinding Performance of Porous Diamond Abrasive Tools

Research Square

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Research Square 2021年

作者： Li, Jianwei Fang, Wenjun Wan, Long Liu, Xiaopan Hu, Weida Cao, Dan Han, Kai Li, Yingying Yan, Yonggao Hunan University College of Materials Science and Engineering China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body China Hunan University of Technology Liling ceramic institute China Shangqiu Institute of Technology China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology China

Ordinary diamond presents the disadvantages of poor self-sharpening and concentrated grinding stress when it is used as an abrasive. Moreover, this kind of diamond cannot be well wetted by the vitrified bond, resulting in a lower holding force of the binder to the abrasives (i.e., the diamond is easy to detach from the binder matrix during grinding). These comprehensive factors not only reduce the surface quality of the processed workpiece, but also hinder the processing efficiency. In order to solve these problems, a new type of porous diamond with high self-sharpening properties was prepared using a thermochemical corrosion method in this study. Our results showed a great improvement in pore volume and specifisurface area of the porous diamond compared with ordinary diamond abrasive particles, and the holding force and wettability of vitrified bond to the porous diamond abrasive particles were also improved. Compared with ordinary diamond abrasive tools, porous diamond abrasive tools showed a 29.6% increase in grinding efficiency, a 15.5% decreased in grinding ratio, a 27.5% reduction in workpiece surface roughness, and the scratches on the silicon wafer surface were reduced and refined. © 2021, CC BY.

关键词： Grinding (machining)

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A Universal Strategy for Synthesizing Nanosized Transition-Metal Phosphides@N,P-Codoped Carbon Electrocatalysts Toward Overall Water Splitting

SSRN

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SSRN 2022年

作者： Sun, Xueping Wei, Peng He, Zhimin Cheng, Fangyuan Tang, Lin Li, Qing Han, Jiantao He, Jianhua The Institute for Advanced Studies Wuhan University Hubei Wuhan430072 China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Hubei Yangtze Memory Laboratories Wuhan430205 China

To date, it is urgent yet challenging to develop highly active and cost-effective bifunctional electrocatalysts towards water splitting. Among various non-precious metal candidates, transition metal phosphides (TMPs) have been of concern due to their abundant reserves, outstanding conductivity and excellent electrocatalytic activity. However, the current TMPs synthesis processes are always complicated and dangerous due to the commonly use of toxic and flammable phosphorus sources. Herein, we propose a general and scalable synthetic strategy to prepare a series of nanosized transition metal phosphide encapsulated in nitrogen-phosphorus co-doped carbon (TMP@NPC) catalysts by using green and cheap adenosine triphosphate (ATP) as the new phosphorus source. Benefiting from the in situ derived N, P co-doped carbon layers and nanoscale dimensions, all TMP@NPC catalysts exhibit good HER and OER performance. Especially, the CoP@NPC displays the lowest overpotentials of 184.35 mV and 303 mV at 10 mA cm-2 toward HER and OER in alkaline electrolyte, which also exhibits outstanding stability (over 50 hours at 10 mA cm-2) in both reactions. Moreover, CoP@NPC acts as both cathode and anode, which also exhibits good water splitting performance. This work not only constructs efficient bifunctional catalysts, but also broadens the green general synthesis method of nanosized TMPs. © 2022, The Authors. All rights reserved.

关键词： Electrocatalysts

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Triethanolamine-mediated photodeposition formation of amorphous Ni-P alloy for improved H2-evolution activity of g-C3N4

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Science China materials 2020年第11期63卷 2215-2227页

作者： Huogen Yu Jiachao Xu Duoduo Gao Jiajie Fan Jiaguo Yu Department of Chemistry School of ChemistryChemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Developing efficient,stable,and low-cost novel electron-cocatalysts is crucial for photocatalytic hydrogen evolution ***,amorphous Ni-P alloy particles were successfully modified onto g-C3N4 to construct the Ni-P/g-C3N4 photocatalyst through a simple and green triethanolamine(TEOA)-mediated photodeposition *** was found that the TEOA could serve as an excellent complexing agent to coordinate with Ni2+to form[Ni(TEOA)]^2+complex,which can promote the rapid and effective deposition of amorphous Ni-P alloy on the g-C3N4 *** tests suggest that the hydrogen-evolution performance of gC3N4 can be greatly promoted through integrating amorphous Ni-P ***,the Ni-P/g-C3N4(5 wt%)exhibits the superior H2-generation activity(118.2μmol h^-1g^-1),which is almost 35.8 times that of bare ***,the amorphous Ni-P alloy cocatalyst can also serve as the general hydrogen-production cocatalyst to greatly enhance the photocatalytic performance of traditional semiconductor materials such as Ti O2 and Cd *** on the present results,the mechanism of the amorphous Ni-P alloy as the high-efficiency electron transfer medium was proposed for the boosted H2-generation *** present facile route may broaden the horizons for the efficient development of highly active cocatalysts in photocatalytic field.

关键词： photocatalysis H2evolution g-C3N4 amorphous NiP alloy photodeposition

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Gas sensing selectivity of oxygen-regulated SnO2 films with different microstructure and texture

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Journal of materials Science & technology 2019年第10期35卷 2232-2237页

作者： Ruiwu Li Yanwen Zhou Maolin Sun Zhen Gong Yuanyuan Guo Xitao Yin Fayu Wu Wutong Ding School of Material Science and Metallurgy University of Science and Technology LiaoningAnshan114051China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China

The selectivity of gas sensing materials is increasingly important for their applications. The oxygenregulated SnO2 films with(110) and(101) preferred orientation were obtained through magnetron sputtering, followed by annealing treatment. Their micro-structure, surface morphology and gas response were investigated by advanced structural characterization and property measurement. The results showed that the as-prepared(110)-oriented SnO2 film was oxygen-rich and had more adsorption sites while the as-prepared(101)-oriented SnO2 film was oxygen-poor and more sensitive to de-oxidation.H2 gas sensitivity, response speed, selectivity between H2 and CO of the(110)-orientated SnO2 film was superior to that of the(101)-orientated SnO2 film. After treated at high temperature and high vacuum,the reduction of gas-sensing properties of the annealed(110) SnO2 film was much more than that of the annealed(101) SnO2 film. The lattice oxygen was responsible for the difference in gas-sensing response between(110) and(101)-oriented SnO2 films under oxygen regulation. This work indicated the gassensing selectivity of the different crystal planes in SnO2 film, providing a significant reference for design and extension of the related materials.

关键词： Gas sensor SnO2 Oxygen regulation Preferred orientation H2 selectivity

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Bifunctional Dimethyldichlorosilane Assisted Air-Processed Perovskite Solar Cell with Enhanced Stability and Low Voltage Loss

SSRN

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SSRN 2022年

作者： Zhou, Peng Lu, Shaojuan Mo, Yanping Cheng, Jiahao Jiao, Chuanjia Zhang, Xiao-Li Li, Wangnan Liang, Guijie Wang, Jingyang Huang, Fuzhi Cheng, Yi-Bing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Institute of Aerospace Chemotechnology Xiangyang441003 China Hubei key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China School of Materials Science and Engineering Zhengzhou University Henan Province 450001 China Hubei Longzhong Laboratory Xiangyang441000 China Solar Hydrogen Production Lab Foshan Xianhu Laboratory of the Advanced Energy Science Technology Guangdong Laboratory Foshan China

Perovskite solar cells (PSCs) attract great interest due to high-efficiency and low-cost. However, perovskite materials are sensitive to moisture, causing it cannot be prepared in air, which increase the manufactory cost. To address it, we employ dimethyldichlorosilane (DMDCS) to passivate the grain boundaries and surfaces of MAPbI3 perovskite films, thus inhibiting the erosion of water. Then the preparation of highly efficient PSCs in air atmosphere is realized. The passivation mechanism of DMDCS on the perovskite film and interface is analyzed via investigating photo-excited carrier mobility and ultrafast transient adsorption spectroscopy (TAS). The results of TAS exhibit an improvement of charge carrier diffusion with an enhanced lifetime from 7.62 ps to 11.22 ps by the precursor doping. The charge carrier extraction at the interface is also greatly promoted with the decreased decay time from 0.29 ns to 0.16 ns by surface passivation, consistent well with the carrier mobility via space charge limited current (SCLC). The modified devices demonstrate an excellent efficiency of 20.69%, with a fill factor exceeding 80%. The optimized devices exhibit an excellent long-term environmental stability, retaining more than 80% of the initial efficiency after 1000 h in ambient with a relative humidity of 40 RH % without encapsulation. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Enhanced CoCrFeNi (TiC) 0.2 high-entropy alloy by thermodynamic treatment

SSRN

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SSRN 2025年

作者： Liang, Shiqing Tu, Bingtian Li, Peiyao Chen, Xiaohong Li, Jiaqi Li, Jun Wei, Qinqin Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Refractories Wuhan University of Science and Technology Wuhan430081 China

CoCrFeNi based high-entropy alloy has good strength and toughness properties compared to conventional alloys, showing great application prospects in advanced fields such as aerospace structural materials. However, the yield strength of the as-cast CoCrFeNi(TiC)0.2 alloy remains low, limiting its practical application as a high-strength structural material. In this study, we enhance the CoCrFeNi(TiC)0.2 alloy by hot rolling and annealing, which promotes the ultrafine carbide precipitation, partial recrystallization of the alloy matrix, and residual high-density dislocations. The secondphase strengthening of carbide precipitation, fine-grain strengthening of alloy matrix, and dislocation strengthening jointly improve the yield strength. The yield strength of the CoCrFeNi(TiC)0.2 alloy after thermomechanical treatment at 700°C for 1 h has a high yield strength of 865 MPa, ultimate tensile strength of 1047 MPa and uniform elongation of 6.8%. This study provides a theoretical guidance for the composition and technological design of high performance alloys. © 2025, The Authors. All rights reserved.

关键词： Tensile strength

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Enhanced CoCrFeNi(TiC) 0.2 high-entropy alloy by thermodynamic treatment

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materials Today Communications 2025年 47卷

作者： Shiqing Liang Bingtian Tu Peiyao Li Xiaohong Chen Jiaqi Li Jun Li Qinqin Wei Qiang Shen Hubei Longzhong Laboratory Xiangyang Hubei 441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Refractories Wuhan University of Science and Technology Wuhan 430081 China

CoCrFeNi-based high-entropy alloys exhibit superior strength and toughness properties compared to conventional alloys with promising aerospace structural applications. However, the strength of the as-cast CoCrFeNi(TiC) 0.2 alloy remains low, limiting its practical application as a high-strength structural material. In this study, we enhance the CoCrFeNi(TiC) 0.2 alloy by hot rolling and annealing, which promotes the ultrafine carbide precipitation, partial recrystallization of the alloy matrix, and residual high-density dislocations. The second-phase strengthening of carbide precipitation, fine-grain strengthening of alloy matrix, and dislocation strengthening jointly improve the yield strength. The CoCrFeNi(TiC) 0.2 alloy subjected to 50 % hot rolling followed by thermomechanical treatment at 700°C for 1 h demonstrates excellent mechanical properties, exhibiting a yield strength of 865 MPa, an ultimate tensile strength of 1047 MPa, and a uniform elongation of 6.8 %. This study provides a theoretical guidance for the composition and technological design of high performance alloys.

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