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Magneto-enhanced electro-thermal conversion performance

Science China materials 2021年第11期64卷 2835-2845页

作者： Shifang Ma Cuncheng Li Wenjun Cui Xiahan Sang Ping Wei Wanting Zhu Xiaolei Nie Fu-Hua Sun Wenyu Zhao Qingjie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528000China Nanostructure Research Center Wuhan University of TechnologyWuhan 430070China

Synergistically regulating carrier and phonon transport on the nanoscale is extremely difficult for all thermoelectric(TE)materials without cage *** BaFe_(12)O_(19)/Bi_(2)Te_(2.5)Se_(0.5)thermoelectromagnetic nanocomposites are designed and synthesized as a benchmarking example to simultaneously tailor the transport properties on the nanoscale.A magneto-trapped carrier effect induced by BaFe_(12)O_(19)hard-magnetic nanoparticles(NPs)is discovered,which can lower the carrier concentration of n-type Bi_(2)Te_(2.5)Se_(0.5)matrix by 16%,and increase the Seebeck coefficient by 16%.Meanwhile,BaFe_(12)O_(19)NPs provide phonon scattering centers and reduce the thermal conductivity by 12%.As a result,the ZT value of the nanocomposites is enhanced by more than 25%in the range of 300-450 K,and the cooling temperature difference increases by 65%near room *** work greatly broadens the commercial application potential of ntype Bi_(2)Te_(2.5)Se_(0.5),and demonstrates magneto-trapped carrier effect as a universal strategy to enhance the electro-thermal conversion performance of TE materials with high carrier concentration.

关键词： thermoelectromagnetic nanocomposite thermoelectric material magnetic nanoparticles magneto-trapped carrier effect electro-thermal conversion performance

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advanced Li-SexSy battery system:Electrodes and electrolytes

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Journal of materials Science & technology 2020年第20期52卷 1-15页

作者： Huan Du Shihao Feng Wen Luo Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan430070China

The worldwide energy shortage has led to numerous researches for the exploration of new-type battery materials to deal with the energy *** achieve a great leap in energy density,the study of high capacity electrode materials plays a major *** a replacement to the energy accumulation system of lithium-sulfur(Li-S) and lithium-selenium(Li-Se) batteries,great concern is generated over lithium/selenium-sulfur(Li-SexSy) batteries as they combine the advantages of S(high capacity) and Se(improved electrical conductivity),consequently stands for extensive new cathode *** recent years,widespread researches have been conducted and great achievements have been *** review sums up the research status on Li-SexSy batteries and concentrates on the outstanding work of SexSy cathode *** reaction mechanism and capacity fading mechanism are *** performance-structure relationship is stated in regard of different cathode structures,including a variety of carbon hosts,conducting polymer hosts,transition metal-doped carbon electrodes and various Se/S *** compatibilities of frequently-used carbonate-based and ether-based electrolyte and other new-type electrolytes for Li-SexSy battery are *** for the future developments of Li-SexSy batteries are finally proposed.

关键词： Selenium-sulfur Cathode materials Electrolytes Lithium-sulfur

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A new catalyst for urea oxidation: NiCo2S4 nanowires modified 3D carbon sponge

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Journal of Energy Chemistry 2020年第11期29卷 195-205页

作者： Biaopeng Li Congying Song Jianjun Rong Jing Zhao Hong-En Wang Ping Yang Ke Ye Kui Cheng Kai Zhu Jun Yan Dianxue Cao Guiling Wang Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Urea oxidation is a significant reaction for utilizing urea-rich wastewater or human urine as sustainable power sources which can ease the water eutrophication while generate electricity. A direct urea-hydrogen peroxide fuel cell is a new kind of fuel cell employing urea as fuel and hydrogen peroxide as oxidant which possesses a larger cell voltage. Herein, this work tries to promote the kinetics process of urea oxidation by preparing low-cost and high-efficient NiCo2S4 nanowires modified carbon sponge electrode. The carbon sponge used in this work with a similar three-dimensional multi-channel structure to Ni foam, is prepared by carbonizing recycled polyurethane sponge which is also a process of recycling waste. The performance of the prepared catalyst in an alkaline solution is investigated in a three-electrode *** the introduction of Co element to the catalyst, a reduced initial urea oxidation potential and a high performance are obtained. Furthermore, a direct urea-hydrogen peroxide fuel cell is assembled using the NiCo2S4 nanowires modified carbon sponge anode. Results indicate that the prepared catalyst provides a chance to solve the current problems that hinder the development of urea electrooxidation(high initial urea oxidation potential, low performance, and high electrode costs).

关键词： Carbon sponge Direct urea fuel cell Electrocatalyst NiCo2S4 nanowires Urea oxidation

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Low-Pt Anodes with Gradient Molybdenum Isomorphism for High Performance and Anti-Co Poisoning Pemfcs

SSRN

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SSRN 2023年

作者： Jin, Changqing Liao, Yucong Zhang, Aojie Zhao, Shengqiu Wang, Rui Li, Junsheng Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China School of Chemistry Chemical Engineering and life Sciences Wuhan University of Technology Wuhan430070 China

The development of low Pt-loading hydrogen oxidation reaction electrocatalysts with high catalytic activity, high durability, and resistance to CO poisoning is essential for the commercialization of proton exchange membrane fuel cells. Herein, two kinds of low Pt-loading HOR catalysts, PtMo1/KB with the synergistic effect of PtMo alloy particles (APs), Pt single atoms (SAs) and Mo SAs and PtMo10/KB with the synergistic effect of PtMo atomic clusters (ACs), Pt SAs and Mo SAs, were fabricated. Electrochemical tests show that PtMo1/KB (1.85 wt.% Pt) exhibits extraordinary HOR activity and durability, with mass activity in electrochemical cells and even in PEMFCs that are 8.36 times and 2.71 times higher than that of commercial Pt/C, respectively. In addition, PtMo10/KB (1.56 wt.% Pt) was tested in electrochemical cells and PEMFCs in H2/1000 ppm CO and its resistance to CO poisoning was superior to that of commercial Pt/C. DFT calculations showed that the adsorption energy of the intermediates H* and CO was optimized by tuning the d-band center of Pt, thus enhancing the HOR activity and CO tolerance of the catalyst. Meanwhile, in situ CO-adsorption surface-enhanced infrared adsorption spectroscopy also confirmed that the weakening of the Pt-CO bond strength and the adsorption energy of CO contributed to the improvement of CO tolerance in PtMo10/KB. © 2023, The Authors. All rights reserved.

关键词： Electrocatalysis

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3D-bioprinted vascular scaffold with tunable mechanical properties for simulating and promoting neo-vascularization

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Smart materials in Medicine 2022年 3卷 199-208页

作者： Zhou, Xin Gao, Qiang Yu, Dan Shao, Yichun Wang, Zhaohui Liu, Xiao Wang, Wenwu Chang, Likun Ma, Tianxiang Mok, Hsiaopei Cen, Jianzheng Chen, Jimei Tahchi, Mario El Zhuang, Jian Mou, Fangzhi Zhang, Jin Yin, Yixia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Cardiac Surgery Guangdong Cardiovascular Institute Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou510100 China Key Laboratory for Biomechanics and Mechanobiology of the Ministry of Education Beijing Advanced Innovation Centre for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University Beijing100083 China LBMI Department of Physics Faculty of Sciences 2 Lebanese University P.O. Box 90656 Jdeidet Lebanon Qingyuan Innovation Laboratory College of Chemical Engineering Fuzhou University 2 Xueyuan Road Fuzhou350108 China

Alternative artificial vessels with tissue-matching mechanical and biological performance have been continuously taking great attention in bioengineering. However, it is challenging to take into account both mechanical and biological properties in formulating a hydrogel material. In the current study, a composite hydrogel ink based on geltain-methacryloyl (GelMA) and sodium alginate (SA) was prepared by a two-step polymerization process, and its fast shaping was realized by stabilizing the alginate fraction in calcium ion bath as well as the photo-crosslinking of GelMA. Mechanical properties of the transparent 3D printing GelMA/Gelatin/SA blood vessels were determined by testing their stretching and resilience performance. Based on Von Mise stress simulation using Ansys, strain of the artificial blood vessels reached 147% and the elastic Young's modulus reached approximately 224 kPa in the optimal hydrogel formulation, matching well with capability of enduring certain blood pressure encountered in real tissue. A selective and uniform permeability of hydrogel tubes was presented by using small molecules and human red blood cells, meanwhile excellent hemolysis, cell viability, and proliferation ability were also verified. Based on the results of in vitro assessment and the in vivo transplantation in SD rats, our proposed GelMA/Gelatin/SA vessels, with tissue-matching mechanical properties and their ideal biodegradation behavior, promoted neo-vascularization capacity and showed promising potential in producing an artificial blood vessel. © 2022 The Authors

关键词： Blood

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New Insights into the Microstructure and Tribological Behaviors of the Boronized Layer on Inconel 718 Alloy Surface

SSRN

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SSRN 2024年

作者： Wu, Zhenjiang Chen, Shuqun Shao, Mengxue Liu, Yue Li, Yangzhong Peng, Jian Li, Hongyi Wang, Jinshu Key Laboratory of Advanced Functional Materials Education Ministry of China College of Materials and Engineering Beijing University of Technology Beijing100124 China Beijing University of Technology China High Performance Computing Department National Supercomputing Center in Shenzhen Guangdong Shenzhen518055 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Boronizing of nickel based superalloys is of great interests in aerospace industry due to the excellent wear resistance, however, little information has been known on its phase formation and load-dependent wear mechanism. In this work, high quality boronized layer was developed on the Inconel 718 alloy by powder pack-boriding process at 850 °C for 6 h under argon atmosphere. The microstructure characteristics and load-dependent tribological behaviors of the boronized layers were systematically investigate. It is found that the main boronized layer on Inconel 718 alloy consists of a ~11.3 um thick compound layer with nanocrystalline (Ni,Fe)23B6 and (Cr,Fe)B grains, and a ~10.9 um thick diffusion layer with dendritic Cr2B precipitation within the matrix. The phase evolution of the boronizing layer are explainable by thermodynamic modeling of Ni-Cr-B system and the phase stability for metastable Ni-B compounds is confirmed by DFT simulation. Due to the good interfacial bonding strength and high microhardness value, the boronized layer displays excellent wear resistance against Si3N4 ceramic balls at room temperature. In particular, the wear rates of the specimens under applied loads of 10-20 N are higher than those in the 50-100 N loads case. The latter is mainly facilitated by the formation of lubricating boron oxide tribolayer on friction ball surface. We believe the findings in present work will contribute to a deeper understanding of the boronizing treatment in nickel-based superalloys. © 2024, The Authors. All rights reserved.

关键词： Wear resistance

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Chemical adsorption on 2D dielectric nanosheets for matrix free nanocomposites with ultrahigh electrical energy storage

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Science Bulletin 2022年第6期67卷 609-618,M0004页

作者： Jie Chen Zhonghui Shen Qi Kang Xiaoshi Qian Shengtao Li Pingkai Jiang Xingyi Huang Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing Department of Polymer Science and EngineeringThe State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710054China

Relaxor ferroelectric polymers display great potential in capacitor dielectric applications because of their excellent flexibility,light weight,and high dielectric ***,their electrical energy storage capacity is limited by their high conduction losses and low dielectric strength,which primarily originates from the impact-ionization-induced electron multiplication,low mechanical modulus,and low thermal conductivity of the dielectric *** a matrix free strategy is developed to effectively suppress electron multiplication effects and to enhance mechanical modulus and thermal conductivity of a dielectric polymer,which involves the chemical adsorption of an electron barrier layer on boron nitride nanosheet surfaces by chemically adsorbing an amino-containing polymer.A dramatic decrease of leakage current(from 2.4×10^(-6)to 1.1×10^(-7)A cm^(-2)at 100 MV m^(-1))and a substantial increase of breakdown strength(from 340 to 742 MV m^(-1))were achieved in the nanocompostes,which result in a remarkable increase of discharge energy density(from 5.2 to 31.8 J cm^(-3)).Moreover,the dielectric strength of the nanocomposites suffering an electrical breakdown could be restored to 88%of the original *** study demonstrates a rational design for fabricating dielectric polymer nanocomposites with greatly enhanced electric energy storage capacity.

关键词： Boron nitride nanosheets Electron barrier layer Relaxor ferroelectric polymers Nanocomposites Electrical energy storage

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The microstructural evolution and wear properties of Ni60/high-aluminum bronze composite coatings with directional structure

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Rare Metals 2021年第4期40卷 952-960页

作者： Xiao-Tian Yang Xiu-Qian Li Qiang-Bin Yang Jun-Ling Duan Xiao-Yue Fu Heng-Li Wei Wen-Sheng Li College of Materials Science and Engineering State Key Laboratory of Advanced Processing and Recycling of Nonferrous MetalsLanzhou University of TechnologyLanzhou 730050China Wenzhou Engineering Institute of Pump&Valve Lanzhou University of TechnologyWenzhou 325105China Chongqing Key Laboratory of Environmental Materials&Remediation Technologies College of Chemistry&Environmental EngineeringChongqing University of Arts and SciencesChongqing 402160China Department of Material and Chemical Engineering College of Technology and EngineeringLanzhou University of TechnologyLanzhou 730050China

The directional structure of Ni60/high-aluminum bronze composite coating was formed using induction remelting and forced *** microstructural evolution and the characteristics of interface growth were *** results showed that the remelted coating formed metallurgical bonding with the *** micros tructures changed from plane crystal to dendrite,cellular dendrite,fine cellular dendrite,and then to dendrite again with the increase in the cooling *** crystal grew along the heat flow direction and had(111) and(200)preferred orientations when the cooling rate was 1.886 ml-min^(-1).mm^(-2).The plane crystal,dendrite and cellular dendrite were mainly composed of compounds and solid solutions with Ni,Fe and Cu,and they were surrounded by strengthening phases composed of Cr,C and *** grain boundary of directional structure coatings showed the characteristic of regular eutectic growth,but grain boundary of remelted coating presented characteristic of divorced eutectic *** wear resistance of directional structure coatings is better than that of remelted coating.

关键词： Aluminum bronze composite coating Induction remelting Directional structure Grain boundaries Preferred orientation

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The Influence of Alkaline Earth Elements on Electronic Properties ofα-Si3N4 via DFT Calculation

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Journal of Wuhan University of technology(materials Science) 2020年第5期35卷 863-871页

作者： ZHANG Jianwen HUANG Zhifeng YIN Ziqian LI Meijuan CHEN Fei SHEN Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China

We used density functional theory(DFT)calculations to study the influence of alkali earth metal element(AE)doping on the crystal structure and electronic band structure ofα-*** diversity of atomic radii of alkaline earth metal elements results in structural expansion when they were doped into theα-Si3N4 *** energies of the doped structures indicate that dopants prefer to occupy the interstitial site under the nitrogen-deficient environment,while substitute Si under the nitrogen-rich environment,which provides a guide to synthesizingα-Si3N4 with different doping types by controlling nitrogen *** electronic structures,energy levels of the dopants appear in the bottom of the conduction band or the top of the valence band or the forbidden band,which reduces the bandgap ofα-Si3N4.

关键词： first-principles density functional theory calculations alkaline earth elements dopedα-Si3N4 photoluminescence material crystal structure electronic structure

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Effect of calcination temperatures on photocatalytic H_(2)O_(2)-production activity of ZnO nanorods

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Chinese Journal of Catalysis 2022年第2期43卷 226-233页

作者： Zicong Jiang Yong Zhang Liuyang Zhang Bei Cheng Linxi Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200GuangdongChina College of Chemistry and Chemical Engineering Hubei Polytechnic UniversityHuangshi435003HubeiChina Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

Photocatalytic hydrogen peroxide(H_(2)O_(2))production from O_(2) and H2O is an ideal process for solar‐to‐chemical energy ***,ZnO nanorods are prepared via a simple hydrothermal method for photocatalytic H_(2)O_(2) *** ZnO nanorods exhibit varied performance with different calcination *** from calcination,the separation efficiency of photo‐induced carriers is significantly improved,leading to the superior photocatalytic activity for H_(2)O_(2) *** H_(2)O_(2) produced by ZnO calcined at 300℃ is 285μmol L^(−1),which is over 5 times larger than that produced by untreated *** work provides an insight into photocatalytic H2O2 production mechanism by ZnO nanorods,and presents a promising strategy to H2O2 production.

关键词： Photocatalysis Hydrogen peroxide production ZnO nanorod Calcination temperature Oxygen reduction

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