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MIL-100(V) derived porous vanadium oxide/carbon microspheres with oxygen defects and intercalated water molecules as high-performance cathode for aqueous zinc ion battery

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Journal of Energy Chemistry 2024年第3期90卷 578-589,I0013页

作者： Yuexin Liu Jian Huang Xiaoyu Li Jiajia Li Jinhu Yang kefeng cai Shanghai Key Laboratory of Development and Application for Metal-Functional Materials Key Laboratory of Advanced Civil Engineering MaterialsMinistry of EducationSchool of Materials Science&EngineeringTongji UniversityShanghai 201804China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China Research Center for Translational Medicine East HospitalTongji University School of MedicineShanghai 200092China

The development of aqueous zinc ion battery cathode materials with high capacity and high magnification is still a ***,porous vanadium oxide/carbon(p-VO_(x)@C,mainly VO_(2) with a small amount of V_(2)O_(3)) core/shell microspheres with oxygen vacancies are facilely fabricated by using a vanadium-based metal-organic framework(MIL-100(V)) as a sacrificial *** unique structure can improve the conductivity of the VO_(x),accelerate electrolyte diffusion,and suppress structural collapse during ***,H_(2)O molecules are introduced into the interlayer of VO_(x) through a highly efficient in-situ electrochemical activation process,facilitating the intercalation and diffusion of zinc *** the activation,an optimal sample exhibits a high specific capacity of 464.3 mA h g^(-1) at0.2 A g^(-1) and 395.2 mA h g^(-1) at 10 A g^(-1),indicating excellent rate ***,the optimal sample maintains a capacity retention of about 89.3% after 2500 cycles at 10 A g^(-1).Density functional theory calculation demonstrates that the presence of oxygen vacancies and intercalated water molecules can significantly reduce the diffusion barrier for zinc *** addition,it is proved that the storage of zinc ions in the cathode is achieved by reversible intercalation/extraction during the charge and discharge process through various ex-situ analysis *** work demonstrates that the p-VO_(x)@C has great potential for applications in aqueous ZIBs after electrochemical activation.

关键词： Metal-organic frameworks Vanadium oxide Carbon Zn-ion batteries Electrochemical activation

Significantly enhanced thermoelectric performance of flexible PEDOT nanowire film via coating Te nanostructures

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Journal of Materiomics 2020年第2期6卷 364-370页

作者： Dan Ni Haijun Song Yuanxun Chen kefeng cai Key Laboratory of Advanced Civil Engineering Materials(Tongji University) Ministry of EducationSchool of Materials Science&EngineeringTongji University4800 Caoan RoadShanghai201804China

A free-standing and highly conductive poly(3,4-ethylenedioxythiophene)(PEDOT)nanowire(NW)film was used as a working electrode for electrodepositing tellurium(Te).By adjusting the electrodeposition time,the thermoelectric(TE)performance of the free-standing hybrid filmwas *** maximum power factor of 240.0 μWm^(-1) K^(-2)(with the electrical conductivity of 561.4 S cm^(-1) and the Seebeck coefficient of 65.4 μVK^(-1))was obtained from a hybrid film electrodeposited for 7 h,which was 8 times higher than that of the pristine PEDOT NW *** addition,the electrical conductivity of the film almost did not change even after being bent for 400 times around a rod with radius of 4 mm,indicating an excellent *** work offers a facile approach to prepare multilayered TE films,and desirable combination of excellent flexibility,high electrical conductivity,and facile process scalability makes the free-standing PEDOT NW film particularly promising for portable and flexible electronics.

关键词： Flexible Free-standing PEDOT Te Thermoelectric

Polypyrrole/nylon membrane composite film for ultra-flexible allsolid supercapacitor

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Journal of Materiomics 2020年第2期6卷 339-347页

作者： Xiaoxiao Zhang Mingyuan Gao Liang Tong kefeng cai Key Laboratory of Advanced Civil Engineering Ministry of EducationSchool of Materials Science&EngineeringTongji University4800 Caoan RoadShanghai 201804China

Developing high-performance electrode material with excellent flexibility still remains a big ***,we report a simple interfacial polymerization method to fabricate interconnected polypyrrole(PPy)on a commercial nylon membrane(NM).Owing to the special and uniform microstructure of PPy/NM composite film,the free-standing electrode shows a maximal specific capacitance of 2911.4 mF cm^(-2) at 1mA cm^(-2) and superior capacitance retention of 88.7% after charge/discharge for 10,000 *** symmetric all-solid supercapacitor assembled by the PPy/NM composite film exhibits outstanding cyclic stability(capacitance retention of 92.4% after 5000 cycles)and excellent flexibility(capacitance decreasing by 3.3% after bending around a rod with a diameter of 9mm for 1000 times).The results indicate that the PPy/NM composite film has great potential for high performance flexible supercapacitors.

关键词： Polypyrrole Nylon membrane Flexible Supercapacitor

High thermoelectric performance of flexible Ag/Ag_(2)Se composite film on nylon for low-grade energy harvesting

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Journal of Materials Science & Technology 2024年第12期179卷 79-85页

作者： Ying Liu Jiajia Li Zixing Wang Ping Wei Wenyu Zhao Lidong Chen kefeng cai Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Shanghai Key Laboratory of Development and Application for Metal-Functional MaterialsSchool of Materials Science&EngineeringTongji UniversityShanghai 201804China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In this work,Ag/Ag_(2)Se composite films with excellent thermoelectric(TE)properties and flexibility are prepared based on a simple one-pot *** adjusting the nominal ratios of Ag/Se,an optimal Ag/Ag_(2)Se composite film shows a large power factor of~2275 μW m^(-1) K^(-2) at 300 *** an outstand-ing TE performance of the composite film is due to the unique microstructure and the synergistic effect between the Ag and Ag_(2)***,the composite film also shows outstanding flexibility(~91.8%of the initial electrical conductivity is maintained,and the S is unchanged after 1500 bending cycles with a bending radius of 4 mm).Furthermore,a 4-leg flexible TE generator assembled with the optimal film produces a voltage of 14.06 mV and 4.96 μW at a temperature difference of 30.4 *** work provides a new inspiration for the preparation of flexible Ag_(2)Se-based films with excellent TE performance near room temperature.

关键词： Thermoelectric Ag/Ag_(2)Se Flexible Film Power generator

Facile preparation of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)/Ag2Te nanorod composite films for flexible thermoelectric generator

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Journal of Materiomics 2021年第2期7卷 302-309页

作者： Qiufeng Meng Haijun Song Yong Du Yufei Ding kefeng cai Shanghai Key Laboratory of Development and Application for Metal-Functional Materials Key Laboratory of Advanced Civil Engineering MaterialsMinistry of EducationSchool of Materials Science&EngineeringTongji University4800 Caoan RoadShanghai201804China School of Materials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai201418China College of Mechanical and Electrical Engineering Jiaxing UniversityJiaxing314001China

In this work,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)coated silver telluride(PCeAg2Te)nanorods were prepared by a wet-chemical method using the PEDOT:PSS coated tellurium(PCeTe)nanorods as the *** PCeAg2Te nanocomposite film on polyethersulfone(PES)substrate was prepared through vacuum filtration followed by mechanical pressing *** optimal PCeAg2Te nanocomposite film showed a maximum power factor of 143.3 mW/mK^(2) at room temperature and 221.7 μW/mK^(2 ) at 373 *** electrical conductivity of the PCeAg2Te composite film decreased by3.3%after bending for 1000 times around a rod with a radius of 5 *** eight-leg thermoelectric generator assembled with the optimal PCeAg2Te nanocomposite film generated a maximum output power and output density of 209.4 nW and 141.5 mW/cm^(2) at a temperature gradient of 30.3 *** work provides a facile method to prepare thermoelectric materials for flexible thermoelectric generators.

关键词： Thermoelectric Ag2Te Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) Flexible Generator

Facile anodization approach derived low-crystalline NiCoeOH/NiCoOOH composite films for ultra-high areal capacity and mass loading supercapacitors

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Journal of Materiomics 2023年第1期9卷 131-137页

作者： Mingyuan Gao Yuexin Liu Xiaoyu Li Ying Liu Zixing Wang kefeng cai Key Laboratory of Advanced Civil Engineering Materials(Tongji University) Ministry of EducationShanghai Key Laboratory of Development and Application for Metal-Functional MaterialsSchool of Materials Science&EngineeringTongji University4800 Caoan RoadShanghai201804China

The design of supercapacitor materials with both high areal capacity(C)and high mass loading is vitally important for enhancing energy density(E).Herein,we prepared a NiCosingle bondOH/NiCoOOH composite film consisting of NiCosingle bondOH/NiCoOOH nanosheets on an expanded graphite paper(EGP)by using a facial anodization *** as-prepared NiCosingle bondOH/NiCoOOH film exhibits ultra-high C of 11 mA·h·cm^(-2)at a mass loading of 165 mg·cm^(-2),high rate capability of 71%and excellent cycling stability of 95%after 12000 *** outstanding performance is ascribed to the low-crystalline feature of the NiCosingle bondOH/NiCoOOH nanosheets,and the synergistic effect of the NiCosingle bondOH and NiCoOOH phases and high conductive porous *** aqueous asymmetric supercapacitor,assembled with the NiCosingle bondOH/NiCoOOH on EGP and Fe_(2)O_(3)on EGP as positive-and negative-electrode,respectively,shows a highest E of 3.8 mW·h·cm^(-2)at a power density(P)of 4 mW·cm^(-2)and a maximum P of 107 mW·cm^(-2)at an E of 2.7 mW·h·cm^(-2).

关键词： Supercapacitor NiCo-OH NiCoOOH Mass loading Areal capacity Anodic oxidation

STUDY ON STRUCTURE,CHEMICAL BOND AND THERMOELECTRIC PROPERTY OF BORON CARBIDES

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Journal of Wuhan University of Technology(Materials Science) 1999年第4期14卷 9-17页

作者： AN, JM Min, XM Nan, CW cai, KF Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

The correlation between structure, chemical bond and thermoelectric properties of boron carbides is discussed based on structural calculations with self-consistent-field discrete variation (SCF-DV-X-a) method, one of calculation methods of molecular orbital in quantum chemistry. Nine different structural models far calculation are proposed. The calculated results show that the chain is negatively charged and the icosahedron is positively charged, i. e. [C-B-B(C)](delta-) - [B11B(C)](delta+). The total strength of the five covalent bonds between an atom and its five co-ordinating atoms in the icosahedra is slightly larger than the three times of strength of a single bond. The bond between icosahedron and chain or between icosahedra is single bond, but the bond between boron in the middle of chain and carbon or other boron has the characteristic of a double bond. Models 3 and 4 (C-B-B-B11C) are the most stable and easily formed, and the charges of icosahedra of these two models are the lowest, so the disproportionation reaction occurs and the bipolaron forms easily, and the concentration of the carriers and conductivity are the largest, which is consistent with the experimental result that the conductivity has the largest value when the cat-ban content is 13.3%.

关键词： boron carbides thermoelectric property structure chemical bond

CuI/Nylon Membrane Hybrid Film with Large Seebeck Effect

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Chinese Physics Letters 2021年第12期38卷 28-32页

作者： Xiaowen Han Yiming Lu Ying Liu Miaomiao Wu Yating Li Zixing Wang kefeng cai Key Laboratory of Advanced Civil Engineering Materials(Ministry of Education) Shanghai Key Laboratory of Development and Application for Metal-Functional MaterialsSchool of Materials Science&EngineeringTongji UniversityShanghai 201804China

Room-temperature thermoelectric materials are important for converting heat into electrical *** a widebandgap semiconductor material,CuI has the characteristics of non-toxicity,low cost,and environmental *** this work,CuI powder was synthesized by a wet chemical method,then CuI film was formed by vacuum assisted filtration of the CuI powder on a porous nylon membrane,followed by hot *** film exhibits a large Seebeck coefficient of 600μV·K^(-1)at room *** addition,the film also shows good flexibility(~95%retention of the electrical conductivity after being bent along a rod with a radius of 4 mm for 1000 times).A finger touch test on a single-leg TE module indicates that a voltage of 0.9 mV was immediately generated within 0.5 s from a temperature difference of 4 K between a finger and the environment,suggesting the potential application in wearable thermal sensors.

关键词： Seebeck nylon radius

AgPb_mSbTe_(m+2)纳米粉末的水热合成、表征及无压烧结

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稀有金属材料与工程 2007年第A02期36卷 389-391页

作者：严冲蔡克峰同济大学功能材料研究所上海200092

以AgNO_3、Pb(NO_3)_2、Sb(NO_3)_3和Te粉为原料,采用水热法成功合成了无规则形状和球形的AgPb_mSbTe_(m+2) (LAST-m,m=10,12,14,16,18)系列纳米粉末。TEM和XRD分析表明,LAST-m粉末均呈NaCl型晶体结构,颗粒尺寸约为40nm:选区电子衍射图分析表明LAST-m为单晶材料。以无规则粉末为例,采用无压烧结法制备了LAST-18的复合块体材料,并测试了其室温到473 K的热电性能。

关键词：水热法 AgPbmSbTem+2纳米粉末无压烧结热电性能