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Revealing the role of electrode potential micro-environments in single Mn atoms for carbon dioxide and oxygen electrolysis

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Nano Research 2024年第9期17卷 7957-7966页

作者： Pengcheng Liu anyi Liu Kaili Wang Shuai Shi Mengmeng Jin Jingxiu Liu Tao Qin Qian Liu Xijun Liu Jia He Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringInstitute of New-Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering and Environmental Engineering Weifang UniversityWeifang 261061China Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023China Institute for Advanced Study Chengdu UniversityChengdu 610106China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China

Elucidation the relationship between electrode potentials and heterogeneous electrocatalytic reactions has attracted widespread *** we construct the well-defined Mn single-atom(MnSA)catalyst with four N-coordination through a simple thermal pyrolysis preparation method to investigate the electrode potential micro-environments effect on carbon dioxide reduction reactions(CO_(2)RR)and oxygen reduction reactions(ORR).MnSA catalysts generate higher CO production Faradaic efficiency of exceeding 90%at-0.9 V for CO_(2)RR and higher H_(2)O_(2)yield from 0.1 to 0.6 V with excellent ORR *** functional theory(DFT)calculations based on constant potential models were performed to study the mechanism of MnSA on CO_(2)*** thermodynamic energy barrier of CO_(2)RR is lowest at-0.9 V *** hydrogen electrode(RHE).Similar DFT calculations on the H_(2)O_(2)yield of ORR showed that the H_(2)O_(2)yield at 0.2 V was *** study provides a reasonable explanation for the role of electrode potential micro-environments.

关键词： electrode potential micro-environments Mn single-atom catalyst carbon dioxide reduction reaction oxygen reduction reaction constant potential models

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A unique Janus PdZn-Co catalyst for enhanced photocatalytic syngas production from CO_(2) and H_(2)O

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Chinese Chemical Letters 2023年第7期34卷 265-268页

作者： Dongxue Zhou Xiangdong Xue Qingjie Luan Liguo Zhang Baozhen Li Xing Wang Wenjun Dong Ge Wang Changmin Hou Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Shunde Graduate School of University of Science and Technology Beijing Foshan 528399China State Key Laboratory of Inorganic Synthesis&Preparative Chemistry College of Chemistry.Jilin UniversityChangchun 130012China

The development of excellent catalyst to achieve photocatalytic syngas production from CO_(2) and H_(2)O is a prospective and sustainable strategy to alleviate environment and energy crisis. In this study, a unique Janus PdZn-Co catalyst is prepared by annealed the Pd/IRMOF-3(Co, Zn) precursor. Due to the strong interaction, the electron transfers from PdZn terminal to Co terminal in the Janus structure. The electron-received Co terminal facilitates Co sites coordinate with the electrophilic C atom of CO_(2) and the electron-donated PdZn center is easier to coordinate with nucleophilic O atoms of H_(2)O or C=O *** charge redistribution enhances the absorption of CO_(2) and H2O, which promotes H_(2) evolution and CO production. In addition, the carbon shell effectively suppresses the metal core agglomeration and facilitates the electron transmission from photosensitizer to metallic active sites. Meanwhile, the ratio of CO/H_(2) can be regulated(~3:1 to 2:1) by adjusting the proportion of Co and PdZn. The Janus structure and graphite carbon synergistically play a profound impact on improving the photocatalytic *** optimized PdZn-Co catalyst exhibits a superior photocatalytic CO production rate(20.03 μmol/h) and the H_(2) generation rate(9.90 μmol/h) with a ratio of CO/H_(2)= 2.02.

关键词： PdZn@C catalyst Janus structure Charge redistribution Absorption modulation Photocatalyst

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Microstructure evolution during hydrogen pre-sintering of (Tb0.7Lu0.3)2O3 transparent ceramics 17

Microstructure evolution during hydrogen pre-sintering of (T...

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17th National Conference on Laser technology and Optoelectronics

作者： Xin, Yu Xu, Tao Wang, Yaozhi Luo, Peng Zhao, Wenhai Kang, Bin Jing, Wei Mei, Bingchu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Institute of Chemical Materials China Academy of Engineering Physics Mianyang621900 China

ISBN: (纸本)9781510661097

(Tb0.7Lu0.3)2O3 transparent ceramics were prepared by hydrogen pre-sintering and hot isostatic pressing treatment. ZrO2 was added as sintering aid to restrain the abnormal grain growth. The microstructure evolution and linear shrinkage changes of the (Tb0.7Lu0.3)2O3 transparent ceramics in the range of 1400℃~1700℃ were investigated. It can be seen from the results that the linear shrinkage of ceramics increased nonlinearly with the increase of the sintering temperature. In the range of 1550℃~1600℃, the (Tb0.7Lu0.3)2O3 ceramics had a higher shrinkage rate. And the shrinkage rate slowed down when the temperature exceeded 1600℃. The samples prepared by 1550℃ hydrogen pre-sintering combined with 1550℃ hot isostatic pressing sintering showed good optical property. The average grain size was about 1.69μm and the highest transmittance reached 74.81% @1064 nm. © 2022 SPIE.

关键词： Hydrogen

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Phase engineering on high-entropy transition metal dichalcogenides and the entropy-enhanced thermoelectric performance

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Journal of advanced Ceramics 2024年第12期13卷 1985-1995页

作者： Hongxiang Chen Enhui Zhao Xiaochun Wen Sheng Liu Shiyu Li Jiantao Fu Hengzhong Fan Bing Xiao Yongsheng Zhang School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China

High-entropy structures in layered compounds,especially transitional metal dichalcogenides(TMDCs),have powered the field with disordered and versatile chemical compositions,showing great potential in various functional applications,including energy storage and ***,the reported high-entropy phases are mainly 1T phases,2H phases are rare,and approximately 3R phases are still ***,phase engineering of high-entropy TMDCs is achieved by tuning the chemical composition of(Mo_(0.5)W_(0.5))_(1−x)(Nb_(0.5)Ta_(0.5))_(x)Se_(2+δ),0≤x<1,and−0.1≤δ≤0.3.A phase diagram is constructed to guide the synthesis of pure 2H/3R phases over a wide composition/entropy *** increase in VB-group element content and Se overdose facilitated the formation of 3R phases,whereas the opposite occurred for 2H *** first-principles calculations evaluate the stability of phases in different polytypes and compositions,matching well with the composition-dependent crystalline ***,the optimized thermoelectric performance,with a figure of merit(zT=0.36@723 K)in 2H phase of x=0.2,is attributed to the low thermal conductivity(κ)caused by the high-entropy effect,which is one of the highest among(Mo/W)Se_(2)-based *** work enriches high-entropy TMDCs with versatile polytypes,expanding their potential uses for various fields.

关键词： high-entropy layered compounds crystal structure thermoelectric entropy engineering phase engineering

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Oxidation Behaviors of Different Grades of Ferritic Heat Resistant Steels in High-Temperature Steam and Flue Gas Environments

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1103-1116页

作者： Xiaogang Li Qu Liu Shanlin Li Yu Zhang Zhipeng Cai Kejian Li Jiluan Pan Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua UniversityBeijing 100084China

For steam tubes used in thermal power plant,the inner and outer walls were operated in high-temperature steam and flue gas environments *** this study,structure,microstructure and chemical composition of oxide films on inner and outer walls of exservice low Cr ferritic steel G102 tube and exservice high Cr ferritic steel T91 tube were *** oxide film was composed of outer oxide layer,inner oxide layer and internal oxidation *** outer oxide layer on the original surface of tube had a porous structure containing Fe oxides formed by diffusion and oxidation of *** specially,the outer oxide layer formed in flue gas environment would mix with coal combustion products during the growth *** inner oxide layer below the original surface of tube was made of Fe–Cr *** internal oxidation zone was believed to be the precursor stage of inner oxide *** formation of internal oxidation zone was due to O diffusing along grain boundaries to form *** were Fe–Cr–Si oxides discontinuously distributed along grain boundaries in the internal oxidation zone of G102,while there were Fe–Cr oxides continuously distributed along grain boundaries in that of T91.

关键词： Ferritic heat resistant steels High temperature service Oxide layer Steam Flue gas Oxidation evolution

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High-entropy alloy nanoparticles as a promising electrocatalyst to enhance activity and durability for oxygen reduction

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Nano Research 2022年第9期15卷 7868-7876页

作者： Yanan Yu Fanjie Xia Chengjie Wang Jinsong Wu Xianbiao Fu Dongsheng Ma Bencai Lin Jiaao Wang Qin Yue Yijin Kang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China Jiangsu Province Cultivation base for State Key Laboratory of Photovoltaic Science and Technology Changzhou UniversityChangzhou 213164China Department of Chemistry and the Oden Institute for Computational Engineering and Sciences The University of Texas at AustinTX 78712USA

Developing efficient platinum-based electrocatalysts with super durability for the oxygen reduction reaction(ORR)is highly desirable to promote the large-scale commercialization of fuel *** progress has been made in this aspect,the electrochemical kinetics and stability of platinum-based catalysts are still far from the requirements of the practical ***,PtPdFeCoNi high-entropy alloy(HEA)nanoparticles were demonstrated via a high-temperature injection *** HEA nanocatalyst exhibits outstanding catalytic activity and stability towards ORR due to the high entropy,lattice distortion,and sluggish diffusion effects of HEA,and the HEA nanoparticles delivered a mass activity of 1.23 A/mgPt and a specific activity of 1.80 mA/cmPt 2,which enhanced by 6.2 and 4.9 times,respectively,compared with the values of the commercial Pt/C *** importantly,the high durability of PtPdFeCoNi HEA/C was evidenced by only 6 mV negativeshifted half-wave potential after 50,000 cycles of accelerated durability test(ADT).

关键词： high-entropy alloy oxygen reduction reaction electrocatalyst high durability

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Enhanced polysulfide redox kinetics by niobium oxynitrides via insitu adsorptive and catalytic effect in wide temperature range

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Nano Research 2022年第7期15卷 6200-6207页

作者： Benben Wei Chaoqun Shang Qiao Cu Le Hu Xuelian Fu Guofu Zhou Xin Wang School of Materials Science and Engineering&Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of TechnologyWuhan 430205China Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&South China Academy of Advanced Optoelectronics South China Normal UniversityGuangzhou 510006China School of Materials Science and Engineering&State Key Laboratory of Material Processing and Die and Mold Technology Huazhong University of Science and TechnologyWuhan 430074China

The development of Li-S batteries(LSBs)is hindered by the low utilization of S species and sluggish redox reaction *** metal oxides always possess high adsorption to polar S species,while conductive metal nitrides show fast electron transport and ensure fast redox reaction of S *** combination merits of metal oxides and metal nitrides in one provide an effective strategy to improve the electrochemical performance of *** this work,defect design of niobium oxynitrides highly dispersed on graphene(NbON-G)is evaluated as effective trapper and catalyst for S *** to the effective structural merits including enriched active sites,alleviated volume variation,defect modulated electronic property,and in-situ chemisorption and catalytic conversion of soluble lithium polysulfides(LiPSs),the LSBs with NbON-G modified separator show remarkably enhanced performance compared to NbN-G and Nb_(2)O_(5)-***,even at low temperature of−40°C,the LSBs with NbON-G can operate for 1,000 cycles with 0.04%capacity decay per cycle(Rate:2 C).

关键词： lithium polysulfides Li-S batteries niobium oxynitrides catalyst low temperature

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Image processing based three-dimensional model reconstruction for cross-platform numerical simulation

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China Foundry 2023年第2期20卷 139-147页

作者： Yu-cheng Sun Yu-hang Huang Na Li Xiao Han Ai-long Jiang Jin-wu Kang Ji-wu Wang Hai-liang Yu State Key Laboratory of Engine Reliability Weichai Power Co.Ltd.Weifang 261061ShandongChina School of Mechanical Engineering Central South UniversityChangsha 41000China School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Key Laboratory for Advanced Materials Processing Technology School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Numerical simulation is the most powerful computational and analysis tool for a large variety of engineering and physical *** a complex problem relating to multi-field,multi-process and multi-scale,different computing tools have to be developed so as to solve particular fields at different scales and for different ***,the integration of different types of software is ***,it is difficult to perform the transfer of the meshes and simulated results among software packages because of the lack of shared data formats or encrypted data *** image processing based method for three-dimensional model reconstruction for numerical simulation was proposed,which presents a solution to the integration problem by a series of slice or projection images obtained by the post-processing modules of the numerical simulation *** means of mapping image pixels to meshes of either finite difference or finite element models,the geometry contour can be extracted to export the stereolithography *** values of results,represented by color,can be deduced and assigned to the *** the models with data can be directly or indirectly integrated into other software as a continued or new numerical *** three-dimensional reconstruction method has been validated in numerical simulation of castings and case studies were provided in this study.

关键词： cross-platform numerical simulation 3D model reconstruction image processing slice

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(K, Na)NbO3-based lead-free piezoceramics: one more step to boost applications

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National Science Review 2022年第10期9卷 13-15页

作者： Huan Liu Yi-Xuan Liu Aizhen Song Qian Li Yang Yin Fang-Zhou Yao Ke Wang Wen Gong Bo-Ping Zhang Jing-Feng Li State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University School of Materials Science and Engineering University of Science and Technology Center of Advanced Ceramic Materials and Devices Yangtze Delta Region Institute of Tsinghua University

Piezoelectric materials, as a conversion medium between mechanical and electrical energies, are widely used in actuators, sensors and sonar ***-based materials represented by lead zirconate titanate(PZT) have dominate...

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Microstructure evolution and mechanical properties of Al_(2)O_(3)foams via laser powder bed fusion from Al particles

Advanced Powder Materials

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advanced Powder materials 2023年第4期2卷 114-123页

作者： Ye Dong Annan Chen Ting Yang Shuai Gao Shuning Liu Bingjian Guo Hongyi Jiang Yusheng Shi Chunze Yan School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Centre for Advanced Structural Materials Department of Mechanical EngineeringCity University of Hong KongHong KongChina

Laser powder bed fusion(LPBF)combined with reaction bonding(RB)of Al particles is an effective method for preparing high-performance 3D Al_(2)O_(3) ceramic ***,the indistinct microstructure evolution hinders the regulation of pore features and the improvement of synthetic ***,the microstructure evolution of the Al_(2)O_(3) ceramic foams during the LPBF/RB process is clariﬁed by various characterization methods,and the corresponding mechanical property modulation is realized by optimizing LPBF parameters,organic binder(E12 epoxy resin)content,heating rate,sintering time,and coral-like Al_(2)O_(3) *** expansion from Al_(2)O_(3) outward growth and Al granule precipitation counteracts the shrinkage from E12 decomposition and Al_(2)O_(3) sintering,resulting in an ultra-low shrinkage of 0.94%–3.01%.The pore structures of particle packing pores,hollow spheres,and microporous structures allow a tunable porosity of 52.6%–73.7%.The in-situ formation of multi-scale features including hollow spheres,ﬂaky grains,whiskers,nanoﬁbers,and bond bridges brings about a remarkably high bending strength of 6.5–38.3 ***ﬁndings reveal the relationship between microstructure evolution and property optimization of high-performance ceramic foams,with potential signiﬁcance for microstructure design and practical application.

关键词： Al_(2)O_(3)ceramic foams Laser powder bed fusion Reaction bonding Microstructure evolution Mechanical property modulation

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