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synthesis of Cr_2AlC from Elemental Powders with Modified Pressureless Spark Plasma Sintering

Journal of Wuhan University of technology(materials Science) 2019年第2期34卷 287-292页

作者：葛梦妮 WANG Xiaofan LI Gaiye LU Chen 张建峰 TU Rong College of Mechanics and Materials Hohai University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

We introduced a modified pressureless sintering strategy by SPS with a new T-shape die and tapered punches, which helps the evaporation of melted Al and reduces the sample sticking with the inner wall of the die. Thus, the die breaking risk in the sintering process or the de-molding process is avoided at all. At a low temperature and short holding time, a high purity of Cr_2 AlC was obtained in this SPS process from the optimization of different molar ratios of raw materials. Simultaneously, the high porosity of the as-obtained sample was also a distinguishing feature worth noticing. The reaction mechanism for this process was also discussed in detail. This study presented a new venue for future development of high purity "MAX" materials and others related materials by a modified pressureless sintering strategy.

关键词： pressureless spark plasma sintering Cr2AlC reaction mechanism

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In-Situ Study of Photo-Rechargeable Aqueous Zinc-Ion Batteries with the Bifunctional α-MnO2 Photoelectrodes

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advanced Functional materials 2025年

作者： Zheng, Zhaobo Ding, Chenzhi Hasan, Md Saif Wang, Kao Liu, Yue Yang, Wei Cheng, Jingzhao Luo, Zhengtang Cao, Shaowen Ding, Yao School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Longzhong Laboratory Xiangyang441000 China Department of Chemical and Biological Engineering and William Mong Institute of Nano Science and Technology Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong

Directly harvesting solar power without traditional solar cells represents an efficient solution to the current energy challenges. Photo-rechargeable batteries (PRBs) are receiving intense interest as they eliminate the additional costs and energy losses associated with off-grid power generation. Herein, photo-rechargeable aqueous Zinc-ion batteries (PRZIBs) are constructed, using α-MnO2 nanowires as bifunctional photoelectrodes to reveal the complex photo-electrochemical effects in MnO2 PRZIBs. Through a series of in situ characterizations under illumination, the advantages of intrinsic light effects in α-MnO2 based PRZIBs are elucidated from three aspects: (1) inhibition of Jahn-Teller distortion via strengthened hydrogen bonding within α-MnO2, (2) suppression of Mn2+ dissolution through the "protective layers" formed by photo-promoted Zn2+/H+ co-intercalation, and (3) acceleration of Zn2+ desolvation in the electrolyte enabled by abundant photogenerated holes. The PRZIBs with α-MnO2 photoelectrodes demonstrate a specific discharge capacity of 308.1 mAh g−1 under illumination (1 sun), along with excellent cycling stability and high energy conversion efficiency of 0.68% (by photocharging only). In addition, the interdigital micro-PRZIBs successfully power wearable sensors, demonstrating practical applicability. This work provides valuable insights into the time-resolved reaction mechanisms in PRZIBs, and opens new prospects for developing PRBs in wearable and portable devices, i.e. smart textiles and biosensors. © 2025 Wiley-VCH GmbH.

关键词： Energy harvesting

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Li3N film modified separator with homogenization effect of lithium ions for stable lithium metal battery

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Progress in Natural Science:materials International 2021年第6期31卷 845-851页

作者： Zhongyun Yan Cheng Zhou Cheng Li Yan Li Chunli Shen Kaijian Yan Xu Xu International School of Materials Science and Engineering State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Lithium metal anode with high theoretical capacity is considered to be one of the most potential anode materials of the next generation. However, the growth of lithium dendrite seriously affects the application of lithium metal anode and the development of lithium metal batteries（LMBs）. Herein, an ultrathin Li3N film modified separator to homogenize the lithium ions and protect the lithium metal anode was reported. Due to the intrinsic properties of Li3N, the functional separator possessed good thermal stability, mechanical properties and electrolyte wettability, and the homogenization of the lithium ion was realized without increasing the interface impedance. With this functional separator, the Li/Li symmetrical cell could achieve a long cycle with low overpotential for 1000 h at a current density of 1 m A cm-2. Furthermore, when the full battery was assembled with Li FePO4and the discharge capacity could be maintained at 151 m Ah g-1after 400 cycles at 1 C. In addition, the full battery also showed good rate performance, and provided a high discharge capacity of 114 m Ah g-1at 5 C.

关键词： Functional separator Solid electrolyte interface Physical vapor deposition Li metal anode

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Isomeric Fluorene-based Heteroundecenes with Different Side Chains Anchoring Positions for Small Molecule Acceptors

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Journal of Wuhan University of technology(materials Science) 2022年第1期37卷 136-147页

作者： WANG Wei ZHAN Chun XIAO Shengqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Two isomeric fluorene-based heteroundecenes of bis(thienocyclopenthieno[3,2-b]thieno)fluorene(BT2T-F)and bis(dithieno[3,2-b:2’,3’-d]thiophene)cyclopentafluorene(B3T-F)have been designed and *** side chains of 4-hexylphenyl anchor on the 5th and 8th positions in B3T-F while on the 4th and 9th positions in BT2T-F,in which the former is closer to the center of the fused *** corresponding acceptor-donor-acceptor(A-D-A)type small molecule acceptors(SMAs)of BT2T-FIC and B3T-FIC were prepared by linking BT2T-F and B3T-F as fused ring donor units with the acceptor unit of 2-(5,6-difluoro-3-oxo-2,3-dihydroinden-1-ylidene)malononitrile(IC-2F),respectively.B3T-FIC presents a superior crystallinity with intense face-on π-π stacking in its neat film while BT2T-FIC is more *** blended with PBDB-T-2Cl as a polymer donor,the optimized PBDB-T-2Cl:BT2T-FIC device exhibits an averaged power conversion efficiency(PCE)of 10.56%while only 7.53%in the PBDB-T-2Cl:B3T-FIC *** improved short-circuit current(J_(sc))and fill factor(FF)of the PBDB-T-2Cl:BT2T-FIC device are the main contribution of its higher performance,which is attributed to its more efficient and balanced charge transport and better carrier recombination *** that BT2T-FIC blend and B3T-FIC blend films both take a preferential face-on orientatedπ-πstacking with comparable distances,the suitable SMA domain size obtained in the BT2T-FIC blend could account for its more efficient photovoltaic *** results highlight the importance of side-chain strategy in developing efficient SMAs with huge fused ring cores.

关键词： polymer solar cells small molecule acceptor side chains morphology

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High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 356-362页

作者： GAO Jiancheng WANG Dangqiang LEI Liwen ZHANG Fan ZHANG Jinyong FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder *** fully dense (98.6%) materials were obtained at 1700℃ under a pressure of *** to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 *** of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was ***,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.

关键词： hot-pressing high-pressure sintering densification TiB2-B4C

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Densification and Structure Evolution of ZrB_(2)-ZrO_(2) Composites Prepared by Plasma Activated Sintering using ZrB2@ZrO2 Powder

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Journal of Wuhan University of technology(materials Science) 2021年第2期36卷 215-222页

作者： YANG Haitao ZHANG Jian LI Junguo SHEN Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The densification and the structure evolution of the plasma activated sintered(PAS sintered)ZrB_(2)-ZrO_(2) composite via the ZrO_(2)-coated ZrB_(2) powder(ZrB_(2)@ZrO_(2))prepared by in situ passivation method were *** composition and microstructure were characterized by XRD,Raman,SEM,and EDS *** coated powder has excellent sintering *** relative density of the composite reaches above 90%at 1200℃,and the main sintering process occurs between ZrO_(2) *** at above 1500℃,the relative density reaches above 95%and the main sintering process occurs between ZrB_(2) and ZrO_(2) *** the increase of ZrO_(2) coating content,the structure of the sintered body changes from ZrB_(2) continuous network structure to island *** the content is 20%,an island structure is *** the ZrO_(2) content further causes the overheating of ZrO_(2).Thus,the best sintering performance reaches when the coating content is 20wt%.

关键词： ZrB2 ZrO2 coating content densification structure evolution

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Refinement of TiB_(2)Powders with High-speed Planetary Mill and Its Effect on TiB_(2)Sinterability

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Journal of Wuhan University of technology(materials Science) 2021年第3期36卷 331-337页

作者： HUANG Qiwei AI Ruomeng BAI Wenhui HE Qianglong WANG Aiyang HU Lanxin WANG Weimin The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Titanium diboride ceramic was produced via spark plasma sintering(SPS)using finer TiB_(2)powder made by high-speed planetary ball *** effects of ball milling parameters on the composites and particle size of TiB_(2)powder were *** was shown that the average particle size of TiB_(2)powder decreased from 5.8 to 1.59μm and the wear rate of WC balls was 1.58 wt%,when the ball-to-powder weight ratio(BPR),the rotary speed and milling time and were 10:1,600 rpm and 20 min,*** content of WC in TiB_(2)powder can be limited below 4.58 vol%by optimizing the milling *** sintering temperature of TiB_(2)powder milled can be decreased obviously,and the mechanical properties are evidently improved and the microstructure becomes more homogeneous when the powder of TiB_(2)becomes *** relative density,hardness,bending strength,and fracture toughness of the TiB_(2)ceramic fabricated at 1700℃reach the optimal values,which are 98.13%,19.14 GPa,756 MPa,and 5.71 MPa·m~(1/2),*** decrease of TiB_(2)particle size and the introduction of WC are the potential reasons for the improvement of TiB_(2)ceramic performance.

关键词： TiB_(2)ceramic high-speed planetary ball mill particle size WC mechanical property

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synthesis and Photovoltaic Properties of A Dithieno[6,5-b：10,11-b＇]-8H-Cyclopentyl[1,2-b：4,3-b＇]Diphenanthrene based Donor-Acceptor Alternating Copolymer

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Journal of Wuhan University of technology(materials Science) 2018年第2期33卷 288-295页

作者：杨明焱 xia fei zhan chun 肖生强 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A novel fused nonacyclic monomer of dithieno[6,5-b：10,11-b＇]-8 H-cyclopentyl[1,2-b：4,3-b＇]diphenanthrene（DTCPDP） was synthesized by combining the structural features of ladder-type and multiple fused multi-cyclic aromatics. DTCPDP has a single sp3-hybridized carbon bridge between fused multi-cyclic aromatics. The copolymerization of DTCPDT with the electron accepting unit of 4,7-di（thiophen-2-yl）benzo[c][1,2,5]thiadiazole（DTBT） via Stille coupling afforded a novel donor-acceptor（D-A） alternating copolymer PDTCPDT-DTBT. The copolymer exhibited good chemical and thermal stabilities, with an optical band gap of 1.82 eV and a low-lying highest occupied molecular orbital（HOMO） energy level of-5.32 eV. When the copolymer was incorporated into polymer： fullerene（PC_（71）BM） blends to fabricate bulk heterojunction polymer solar cell devices, the devices exhibited a moderate maximum power conversion efficiency（PCE） of 5.90%.

关键词： polymer solar cells bulk heterojunction ladder-type conjugated polymers

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synthesis and Characterization of a New Triple-layered PerovskiteKSr_2Nb_3O_(10 )and Its Protonated Compounds

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Journal of Wuhan University of technology(materials Science) 2002年第2期17卷 22-25页

作者：方亮 State Key Lab. of Advanced Tech. For Mater Synthesis and Processing Wuhan University of Technology Wuhan China

New layered perovskites, KSr2Nb3O10 and two new protonated niobates HSr2 Nb3O10·1.2H2O and HSr2Nb3O10,were synthesized by solid state reaction and ion-exchange reaction. These new compounds -were characterized by EPMA, AAS, XRD, IR, DTA and so on. The structure may be described as treble perovskite sheets [Sr2Nb3O10]- interleaved with K+ ,H3O + or H+. These new compounds are new members of the Dion-Jacob-sonseries with n=3 for the general formula M[An-1 NbnO3n+1], and their indexed X-ray powder diffraction data were first reported in the paper.

关键词： niobate peravskite structure ion exchange protonated

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Effects on the thermal expansion coefficient and dielectric properties of CLST/PTFE filled with modified glass fiber as microwave material

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Chinese Chemical Letters 2019年第5期30卷 1111-1114页

作者： Liu Zheng Jing Zhou Jie Shen Yanyuan Qi Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology

Ceramic and polytetrafluoroethylene composites as dielectric materials have a low dielectric loss at high frequency and play an important role in the modern communication ***,room temperature phase transformation of PTFE resins,which is accompanied by a large volume change(>400 ppm/℃),seriously affects the dimensional stability and performance stability of *** LD125 modified glass fiber(GF)was introduced to the CaO-Li2 O-Sm2O3-TiO2(CLST)/PTFE composite,to reduce the thermal expansion coefficient(CTE)of the *** tri-phase composites(CLST/PTFE/GF)show the low dielectric loss and excellent *** effect of GF content on the dielectric properties and CTE was also *** CLST/PTFE filled with 5%GF exhibits the best overall performance,which is a promising microwave dielectric material for microwave communication.

关键词： Microwave communication Thermal expansion coefficient CLST PTFE Dielectric loss Dielectric constant

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