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In-situ construction of N-doped carbon nanosnakes encapsulated FeCoSe nanoparticles as efficient bifunctional electrocatalyst for overall water splitting

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Journal of Energy Chemistry 2022年第5期31卷 699-708页

作者： Yuan Pan Minmin Wang Min Li Guangxun Sun Yinjuan Chen Yunqi Liu Wei Zhu Bin Wang State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation CenterChangzhou UniversityChangzhou 213164JiangsuChina State Key Lab of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi’an 710119ShaanxiChina

The development of bifunctional electrocatalysts with high activity and stability for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is crucial for efficient overall water splitting but still ***,we propose a facile and effective polymerization–pyrolysis–selenization(PPS)strategy for in-situ synthesis of N-doped carbon nanosnakes(NCNSs)encapsulated Fe-doped CoSe nanoparticles(NPs)derived from predesigned trimetallic Zn/Fe/Co polyphthalocyanine conjugated polymer *** from the synergistic effect between the regulation of Fe atoms and CoSe NPs as well as the confinement effect of in situ formed porous conductive carbon nanosnakes,the FeCoSe@NCNSs catalyst exhibited the excellent electrocatalytic activity for HER with small overpotentials(142 and 99 mV in 0.5 M H_(2)SO_(4) and 1 M KOH)and OER(320 mV in 1 M KOH)at the current density of 10 mA cm^(-2).Particularly,it also can be used as an efficient bifunctional electrocatalyst with a cell voltage of 1.66 V to achieve a current density of 10 mA cm^(-2) and superior stability for overall water *** functional theory study reveals that the doping of Fe atoms on Co Se enhanced the splitting and delocalization of metal-d orbitals close Fermi level,and modifies the distribution of Se-p orbitals close Fermi level,which improved the flexibility of electron donor-acceptor system and the hydrogen adsorption free energy change on metal-metal bridge sites in FeCoSe@***,beneficial from the accepting of Fe-Se bridge site,the overpotential of OER which following intramolecular oxygen coupling mechanism is also decreased,thus accelerating the electrocatalytic *** work presents a novel strategy to regulate the activity and stability of transition metal selenides and facilitating the rational design of bifunctional electrocatalysts for overall water splitting applications.

关键词： FeCoSe nanoparticles N-doped carbon nanosnakes Bifunctional electrocatalyst Synergistic effect Water splitting

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Achieving strength-ductility synergy in novel paramagnetic Fe-based medium-entropy alloys through deep cryogenic deformation

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Rare Metals 2024年第9期43卷 4493-4507页

作者： Hu-Wen Ma Yan-Chun Zhao Li Feng Tian-Zeng Liu Zhi-Qi Yu Bo Jin Wang-Chun Duan Peter K.Liaw Dong Ma State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Wenzhou Pump and Valve Engineering Research Institute Lanzhou University of TechnologyWenzhou 325105China Iron and Steel Research Institute Jiuquan Iron and Steel CorporationJiayuguan 735100China Lanzhou Resources and Environment Voc-Tech University Lanzhou 730123China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA Neutron Science Center Songshan Lake Materials LaboratoryDongguan 523808China

Cryogenic pre-deformation treatment has been widely used to effectively improve the comprehensive mechanical properties of steels and novel ***,the dislocation evolution and phase transformation induced by different degrees of deep cryogenic deformation are not yet fully *** this study,the effects of multiple cryogenic pre-treatments on the mechanical properties and deformation mechanisms of a paramagnetic Fe_(63.3)Mn_(14-)Si_(9.1)Cr_(9.8)C_(3.8)medium-entropy alloy(MEA)were investigated,leading to the discovery of a pretreated MEA that exhibits exceptional mechanical properties,including a fracture strength of 3.0 GPa,plastic strain of 26.1%and work-hardening index of *** addition,X-ray diffraction(XRD)and transmission electron microscopy(TEM)analyses revealed that multiple cryogenic pre-deformation treatments significantly increased the dislocation density of the MEA(from 9×10^(15)to 4×10^(16)m^(-2)after three pretreatments),along with a transition in the dislocation type from predominantly edge dislocations to mixed dislocations(including screw-and edge-type dislocations).Notably,this pretreated MEA retained its paramagnetic properties(μ_(r)<1.0200)even after *** calculations showed that cryogenic pretreatment can significantly reduce the stacking fault energy of the MEA by a factor of approximately four(i.e.,from 9.7 to2.6 m J·m^(-2)),thereby activating the synergistic effects of transformation-induced plasticity,twinning-induced plasticity and dislocation strengthening *** synergistic effects lead to simultaneous strength and ductility enhancement of the MEA.

关键词： Deep cryogenic transformation Iron-based medium-entropy alloys Dislocation evolution Phase transformation Stacking fault energy

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Tailored lithium metal/polymer electrolyte interface with LiTa_(2)PO_(8) fillers in PEO-based composite electrolyte

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Rare Metals 2022年第8期41卷 2826-2833页

作者： Bing Huang Zhi-Hong Li Yu-Mei Zhu Yong Che Chang-An Wang Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Enpower Energy Corp. Beijing102600China

The unstable Li/PEO-based electrolyte interface in allsolid-state lithium metal batteries usually leads to high interfacial resistance,low Coulombie efficiency and fast lithium dendrites growth even under a low current *** interface composition directly determines the interfacial integrity,dynamic Li^(+)/e^(-)transport processes and the subsequent Li+plating/stripping behavior;thus,it is of significance to regulate the interphase to have better safety and higher energy density for all-solid-state lithium metal ***,by incorporation of Li^+conducting LiTa_(2) PO_(8) fillers in PEO-based polymer electrolyte.

关键词： electrolyte lithium interface

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Carboxylic bacterial cellulose fiber-based hydrogel electrolyte with imidazole-type ionic liquid for dendrite-free zinc metal batteries

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materials Reports(Energy) 2024年第2期4卷 45-53页

作者： Tianyun Zhang Xiaohong Shi Yu Li Sambasivam Sangaraju Fujuan Wang Liang Yang Fen Ran School of Mechanical and Electronical Engineering Lanzhou University of TechnologyLanzhou730050PR China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou730500PR China National Water and Energy Center United Arab Emirates UniversityAl Ain15551United Arab Emirates

Aqueous zinc metal batteries are regarded as the most promising energy storage system due to their advantages of high safety,low cost,and high theoretical ***,the growth of dendrites and the occurrence of side reactions hinder the development of zinc metal *** previous attempts to design advanced hydrogel electrolytes,achieving high mechanical performance and ionic conductivity of hydrogel electrolytes has remained *** this work,a hydrogel electrolyte with an ionic crosslinked network is prepared by carboxylic bacterial cellulose fiber and imidazole-type ionic liquid,following by a covalent network of *** hydrogel electrolyte possesses a superior ionic conductivity of 43.76 mS cm^(−1),leading to a Zn^(2+)migration number of 0.45,and high mechanical performance with an elastic modulus of 3.48 GPa and an elongation at breaking of 38.36%.More importantly,under the anion-coordination effect of the carboxyl group in bacterial cellulose and[BF4]−in imidazole-type ionic liquid,the solvation sheath of hydrated Zn^(2+)ions and the nucleation overpotential of Zn plating are *** results of cycled testing show that the growth of zinc dendrites is effectively inhibited and the generation of irreversible by-products is *** the carboxylic bacterial cellulose-based hydrogel electrolyte,the Zn||Zn symmetric batteries offer good cyclability as well as Zn||Ti batteries.

关键词： Bacterial cellulose fiber Ionic liquids Carboxylic group Gel electrolyte Zn metal batteries

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Enhanced High-Temperature Energy Storage Density in P-Type Niox Quantum Dots and P(Vdf-Hfp) Composite Dielectrics

SSRN

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SSRN 2024年

作者： Fang, Cheng Zhang, Ziyi Wang, Jian Ye, Zhanwen Li, Kaiyuan Wu, Luoqi Feng, Xiaobin Duan, Bo Dong, Lijie Zhou, Ling Shen, Zhonghui Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China

The harsh application environment imposes higher requirements on the operating temperature of dielectric energy storage capacitors. Suppressing carrier transmission at high temperatures is a critical way to enhance the breakdown field strength (Eb) and the operating temperature of the dielectrics. In this paper, low-concentration nickel oxide quantum dots (NiOx QDs) with P-type defects are introduced into the polymer matrix, and hot carriers are captured by constructing hole traps, thus improving the high-temperature Eb and energy storage density (Udis) of the polymer. The NiOx QDs were synthesized by the chemical precipitation method and were modified with polydopamine (PDA) to prepare P(VDF-HFP)-based composite films. The results show that the NiOx@PDA QDs can effectively enhance the Eb and Udis of the films. What's more, at 90°C, the Eb of the composite film reaches 2242.78 kV/cm, representing a 42.41% increase compared to pure P(VDF-HFP) film (1574.83 kV/cm), and the Udis reaches 2.94 J/cm3, demonstrating an impressive improvement of 164.86% when compared with pure P(VDF-HFP) (1.11 J/cm3). The results confirmed that the P-type NiOx QDs restricted the Poole-Frenkel emission within the dielectrics. Together with the enhanced compatibility of the organic-inorganic composite interface, the macro defects of the composites were suppressed, and higher Eb and Udis were obtained. This work offers a straightforward and efficient approach for manufacturing high-temperature energy storage dielectrics. © 2024, The Authors. All rights reserved.

关键词： Nanocrystals

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Cu-0.6Cr合金超低温等通道角挤压形变组织及性能调控

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Journal of Central South University 2023年第7期30卷 2094-2106页

作者：郭廷彪钱丹晨黄大伟李凯哲高洋丁雨田 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

对CuCr合金进行液氮冷却ECAP-Bc路径4道次挤压及时效处理(400℃~500℃),采用OM、SEM、EDS、XRD及EBSD检测合金组织结构和取向演变,探索变形条件及时效处理对材料组织性能的影响规律,分析析出相形成与转变的微观机制。结果表明,超低温ECA... 详细信息

对CuCr合金进行液氮冷却ECAP-Bc路径4道次挤压及时效处理(400℃~500℃),采用OM、SEM、EDS、XRD及EBSD检测合金组织结构和取向演变,探索变形条件及时效处理对材料组织性能的影响规律,分析析出相形成与转变的微观机制。结果表明,超低温ECAP-Bc变形会加剧Cu-0.6Cr合金组织与织构的交互作用,减小变形后的极限晶粒尺寸,变形量的增加会促使微/纳析出相数量的增加且在晶界上不连续分布;4道次挤压和450℃时效后材料的抗拉强度、硬度和伸长率分别达到555.0 MPa、HV 167.3和13.1%,导电率超过84%IACS。微合金化、固溶、超低温ECAP,时效协同作用及{111}<112>和{111}<110>织构的形成有利于材料导电性能的同步提升。

关键词：等通道转角挤压 Cu-0.6Cr合金时效织构

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Review of current ZT>1 thermoelectric sulfides

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Journal of Materiomics 2024年第1期10卷 218-233页

作者： Fu-Hua Sun Hezhang Li Jun Tan Lingmei Zhao Xinyu Wang Haihua Hu Chao Wang Takao Mori School of Materials Science and Engineering Hubei Normal UniversityHuangshi435002China International Center for Materials Nanoarchitechtonics(WPI-MANA) National Institute for Materials Science(NIMS)Namiki 1-1Tsukuba305-0047Japan Department of Precision Instrument Tsinghua UniversityBeijing100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Graduate School of Pure and Applied Sciences University of TsukubaTsukuba305-8671Japan Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528225China

Thermoelectrics has played a fascinating role in the developments of direct energy conversion *** the past decade,sulfur-based thermoelectric materials have been significantly advanced in optimizing electrical and thermal transport due to their similarities in chemical and structural properties with tellurides and *** review provides research progress on metal sulfides,particularly focuses on materials exhibiting high thermoelectric figure of merit(ZT>1.0).It highlights the potential compounds,***-S,Sn-S,Pb-S based,and *** strategies of superionic conducting,band configuration tuning,high-entropy alloying,and anomalous harmonic scattering are try to demonstrate the performance-improved mechanisms for thermoelectric *** addition,some common synthesis recipes are briefly introduced,and thereby making potential candidates as excellent alternatives for producing thermoelectric power generators in the mid *** outcomes along with how to further improve the thermoelectric performance and promote its scale-up applications are also outlined at the end.

关键词： Synthetic technology Figure merit of ZT Sulfides Thermoelectric

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Porous Tungsten Synthesized Via Dealloying: Fe6w6c Induced Structure Modification and Mechanical Behavior

SSRN

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SSRN 2023年

作者： Zhang, Jian Jia, Hao Ge, Shuai Wei, Qinqin Luo, Guoqiang Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Porous tungsten with high strength is required in the nuclear industry. However, porous metals prepared by dealloying suffer from grain boundary separation and poor connectivity of the generated ligament structure, resulting in limited strength. This work synthesized porous tungsten with high strength by dealloying with Fe6W6C as the bonding phase. The sintering temperature of the precursor and C content on the Fe6W6C content is investigated, and the effects of Fe6W6C content on the microstructure and mechanical properties of porous tungsten are systematically studied. Fe6W6C can be regulated by precursor sintering temperature and C element. Temperature is the main factor affecting the Fe6W6C content. The ideal W framework is achieved at the sintering temperature is 800 °C when the C addition is 0.1~0.3 wt.% and the amount of Fe6W6C generated is 9.1~27.2 wt.%. After heat treatment, Fe6W6C rearranges under the effect of surface tension and fills into the sintered neck and the gap between the W grain, forming a smooth and continuous W-Fe6W6C composite ligament. The increase of Fe6W6C leads to increased ligament width, reduced "dangling ligaments" and neck curvature, thereby improving the mechanical properties of porous tungsten. The porosity of porous tungsten ranges from 68.1% to 70.6%, and the highest compressive strength is 105 MPa. This work provides a theoretical reference for designing and preparing high-performance porous tungsten. © 2023, The Authors. All rights reserved.

关键词： Microstructure

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Defects enriched hollow porous Co-N-doped carbons embedded with ultrafine CoFe/Co nanoparticles as bifunctional oxygen electrocatalyst for rechargeable flexible solid zinc-air batteries

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Nano Research 2021年第3期14卷 868-878页

作者： Zhao Lei Yangyang Tan Zeyi Zhang Wei Wu Niancai Cheng Runzhe Chen Shichun Mu Xueliang Sun College of Materials Science and Engineering Fuzhou UniversityFuzhou350108China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Department of Mechanical and Materials Engineering The University of Western OntarioLondonONN6A 5B9Canada

The construction and design of highly efficient and inexpensive bifunctional oxygen electrocatalysts substitute for noble-metal-based catalysts is highly desirable for the development of rechargeable Zn-air battery(ZAB).In this work,a bifunctional oxygen electrocatalysts of based on ultrafine CoFe alloy(4-5 nm)dispersed in defects enriched hollow porous Co-N-doped carbons,made by annealing SiO2 coated zeolitic imidazolate framework-67(ZIF-67)encapsulated Fe *** hollow porous structure not only exposed the active sites inside ZIF-67,but also provided efficient charge and mass *** strong synergetic coupling among high-density CoFe alloys and Co-N_(x) sites in Co,N-doped carbon species ensures high oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)***-principles simulations reveal that the synergistic promotion effect between CoFe alloy and Co-N site effectively reduced the formation energy of from O^(*)to OH^(*).The optimized CoFe-Co@PNC exhibits outstanding electrocatalytic stability and activity with the overpotential of only 320 mV for OER at 10 mA·cm^(−2) and the half-wave potential of 0.887 V for ORR,outperforming that of most recent reported bifunctional electrocatalysts.A rechargeable ZAB constructed with CoFe-Co@PNC as the air cathode displays long-term cyclability for over 200 h and high power density(152.8 mW·cm^(−2)).Flexible solid-state ZAB with our CoFe-Co@PNC as the air cathode possesses a high open circuit potential(OCP)up to 1.46 V as well as good bending *** universal structure design provides an attractive and instructive model for the application of nanomaterials derived from MOF in the field of sustainable flexible energy applications device.

关键词： oxygen reduction reaction ultrafine CoFe alloy hollow porous carbons zeolitic imidazolate framework-67 Zn-air battery

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Tuning the dual-active sites of ZIF-67 derived porous nanomaterials for boosting oxygen catalysis and rechargeable Zn-air batteries

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Nano Research 2021年第7期14卷 2353-2362页

作者： Zeyi Zhang Yangyang Tan Tang Zeng Liyue Yu Runzhe Chen Niancai Cheng Shichun Mu Xueliang Sun College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Mechanical and Materials Engineering University of Western OntarioLondonON N6A 5B9Canada

The rational control of the active site of metal-organic frameworks(MOFs)derived nanomaterials is essential to build efficient bifunctional oxygen reduction/evolution reaction(ORR/OER)***,through designing and constructing a Co_(3)O_(4)-Co heterostructure embedded in Co,N co-doped carbon polyhedra derived(Co_(3)O_(4)-Co@NC)from the in-situ compositions of ZIF-67 and cobalt nanocrystals synthesized by the strategy of in-situ NaBH4 reduction,the dual-active site(Co_(3)O_(4)-Co and Co-N_(x))is synchronously realized in a MOFs derived *** formed Co_(3)O_(4)-Co@NC shows excellent bifunctional electrocatalytic activity with ultra-small potential gap(ΔE=E_(j=10)(OER)–E_(1/2)(ORR))of 0.72 V,which surpasses the commercial Pt/C and RuO_(2) *** theory calculation results reveal that the excellent bifunctional electrocatalytic activity can be attributed to the charge redistribution of Co of Co-N_(x) induced by the synergistic effects of well-tuned active sites of Co_(3)O_(4)-Co nanoparticle and Co-N_(x),thus optimizing the rate-determining step of the desorption of O_(2)^(*)intermediate in ORR and OH^(*)intermediate in *** rechargeable Zn-air batteries with our bifunctional catalysts exhibit superior performance as well as high cycling *** simple-effective optimization strategy offers prospects for tuning the active site of MOF derived bifunctional catalyst in electrochemical energy devices.

关键词： dual-active sites bifunctional oxygen electrocatalysts metal−organic frameworks Zn-air batteries density functional theory(DFT)

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