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Tuning the atomic configuration environment of MnN_(4) sites by Co cooperation for efficient oxygen reduction

Journal of Energy Chemistry 2023年第7期82卷 547-559,I0012页

作者： Jing Wang Haihong Zhong Jun Yang Huiyu Li Pinggui Tang Yongjun Feng Dianqing Li State Key Laboratory of Chemical Resource Engineering Beijing Engineering Center for Hierarchical CatalystsCollege of ChemistryBeijing University of Chemical TechnologyBeijing 100029China College of Science Hainan UniversityHaikou 570228HainanChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Carbon-based N-coordinated Mn(Mn-N_(x)/C)single-atom electrocatalysts are considered as one of the most desirable non-precious oxygen reduction reaction(ORR)candidates due to their insignificant Fenton reactivity,high abundance,and intriguing electrocatalytic performance.However,current MnN_(x)/C single-atom electrocatalysts suffer from high overpotentials because of their low intrinsic activity and unsatisfactory chemical stability.Herein,through an in-situ polymerization-assisted pyrolysis,the Co as a second metal is introduced into the Mn-N_(x)/C system to construct Co,Mn-N_(x)dual-metallic sites,which atomically disperse in N-doped 1D carbon nanorods,denoted as Co,Mn-N/CNR and hereafter.Using electron microscopy and X-ray absorption spectroscopy(XAS)techniques,we verify the uniform dispersion of CoN4and MnN4atomic sites and confirm the effect of Co doping on the MnN_(4) electronic structure.Density functional theory(DFT)calculations further elucidate that the energy barrier of ratedetermining step(^(*)OH desorption)decreases over the 2 N-bridged MnCoN_(6) moieties related to the pure MnN_(4).This work provides an effective strategy to modulate the local coordination environment and electronic structure of MnN_(4) active sites for improving their ORR activity and stability.

关键词： Dual-atom sites Oxygen reduction reaction M-Nx/C catalysts Coordination environment Electronic structure Synergistic effect

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Bifunctional oxygen electrode cobalt–nickel sulfides catalysts originated from intercalated LDH precursors

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Journal of Energy Chemistry 2022年第11期31卷 376-386,I0010页

作者： Xiaofei Gong Haihong Zhong Luis Alberto Estudillo-Wong Nicolas Alonso-Vante Yongjun Feng Dianqing Li State Key Laboratory of Chemical Resource Engineering Beijing Engineering Center for Hierarchical CatalystsCollege of ChemistryBeijing University of Chemical TechnologyBeijing 100029China Departamento de Sociedad y Política Ambiental CIIEMADInstituto Politécnico NacionalCalle 30 de junio de 1520Alcaldía GAMC.P.07340 CDMXMexico IC2MP UMR-CNRS 7285University of PoitiersF-86073 Poitiers CedexFrance

Bimetallic cobalt-nickel sulfide nanoparticles anchored on S-,N-codoped holey carbon nanosheets(CoNiS-T@NCFs)with a hydrangea-like morphology,were synthesized via a confinement synthesis route,in which an intercalated LDH precursor was subjected to the interlayer-confined carbonization and host-layer sulfurization.The phase transformation and structure evolution(e.g.,atom site occupancy,crystallite size,and cell volume)of the CoNi-S-T@NCFs electrocatalysts,as a function of sulfurization temperatures,were confirmed by X-ray diffraction and Rietveld analyses.The sulfur vacancies effectively enhance the electrocatalytic activity,while the synergistic effect of(Co,Ni)7 S8 alloy and S,N-codoped carbon matrix facilitates the electron transfer and accelerates reaction kinetics,making CoNi-S-900@NCFs an efficient and stable bifunctional electrocatalyst for oxygen reduction reaction(ORR).The rich highvalence Co(Ⅲ)and Ni(Ⅲ)of CoNi-S-900@NCFs facilitates the in-situ transformation of the metal(oxy)hydroxides intermediates with high catalytic activity for oxygen evolution reaction(OER).Thus,with a bifunctional parameter,ΔE,of 0.75 V(E_(j=10,OER)-E_(1/2,ORR)),this electrocatalyst slightly outperforms the state-of-the-art commercial Pt/C+RuO_(2)/C catalyst(ΔE=0.76 V)in alkaline medium.This work demonstrates the influence that the sulfurization temperature has on the relationship between the structure and electrocatalytic performance of bimetallic sulfides prepared by the synthesis strategy using the intercalated LDH precursor.This strategy can be extended to prepare other chalcogenides with binary or ternary transition metals.

关键词： Bimetallic sulfides Confinement synthesis LDHs ORR OER

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An energy saving and fluorine-free electrorefining process for ultrahigh purity lead refining

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1191-1199页

作者： Xuan Zhang Junqing Pan Yanzhi Sun Yongjun Feng Huixia Niu State Key Laboratory of Chemical Resource Engineering Beijing Engineering Center for Hierarchical Catalysts Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology

The present paper reports a new fluoride-free and energy-saving lead electrolytic refining process in order to solve the serious problems of the existing Betts lead electrorefining process, such as low production efficiency,high energy consumption and fluorine pollution. In the process, a mixed solution of perchloric acid and lead perchlorate(HClO4-Pb(ClO4)2) with the additives of gelatin and sodium lignin sulfonate is employed as the new electrolyte. The cathodic polarization curves show that HClO4 is very stable, and there is no any reduction reaction of HClO4 during the electrolytic process. The redox reactions of lead ions in HClO4 solution are very reversible with an ultrahigh capacity efficiency, so the HClO4 acts as a stable support electrolyte with higher ionic conductivity than the traditional H2SiF6 electrolyte. The results of the scale-up experiments show that under the optimal conditions of 2.8 mol·L-1 HClO4, 0.4 mol·L-1 Pb(ClO4)2 and electrolysis temperature of 45 ℃, the energy consumption is as low as 24.5 kW·h·(t Pb)-1 , only about 20% of that by Betts method at the same current density of 20 mA·cm-2, and the purity of the refined lead is up to 99.9992%, much higher than that specified by Chinese national standard(99.994%, GB/T 469-2013) and European standard(99.99%, EN 12659–1999).

关键词： Lead refining Perchloric acid Fluoride-free Electrorefining process

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Oxygen vacancies engineering by coordinating oxygen-buffering CeO_(2) with CoO_(x) nanorods as efficient bifunctional oxygen electrode electrocatalyst

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Journal of Energy Chemistry 2021年第8期30卷 615-625,I0013页

作者： Haihong Zhong Luis Alberto Estudillo-Wong Yuan Gao Yongjun Feng Nicolas Alonso-Vante State Key Laboratory of Chemical Resource Engineering Beijing Engineering Center for Hierarchical CatalystsCollege of ChemistryBeijing University of Chemical TechnologyNo.15 Beisanhuan East Road100029 BeijingChina IC2MP UMR-CNRS 7285University of PoitiersF-86022 Poitiers CedexFrance Departamento de Sociedad y Política Ambiental CIIEMADInstituto Politécnico NacionalCalle 30 de junio de 1520Alcaldía GAMC.P.07340 CDMXMexico Anqing Research Institute Beijing University of Chemical TechnologyNo.8 Huanhu West RoadHigh-Tech DistrictAnqing 24600China

CeO_(2)decorated CoOx rod-like hybrid,supported onto holey reduced graphene(CoOx/CeO_(2)/RGO)composite,was fabricated via a surfactant-assisted route.Its corresponding electrocatalytic performance towards oxygen reduction/evolution reactions(ORR and OER)was systematically investigated in alkaline electrolyte.Structural,morphological and compositional studies revealed changes in electronic and surface properties when CeO_(2)was introduced as an oxygen buffer material.The oxygen vacancies effectively enhanced the electrocatalytic activity,while the synergistic effect of co-catalyst CeO_(2),CoOx activecenters,and defective graphene with many voids facilitate the charge/mass transfer,making CoOx/CeO_(2)/RGO an efficient and stable bifunctional electrocatalyst for OER/ORR with△E=0.76 V(△E=E10mAcm.-2OER-E_(1/2).ORR).This parameter is 70 mV and 270 mV lower than CoOx/RGO and the benchmark Pt/C,respectively.In addition,the OER/ORR bifunctionality of CoOx/CeO_(2)/RGO composite outperforms that of Pt/C catalyst in a H2-O_(2)micro fuel cell platform.

关键词： Co3O4 CeO_(2) Oxygen vacancies ORR OER

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Improving thermal stability and light fastness of Acid Red 114 by incorporating its anions in a ZnAl-layered double hydroxides matrix

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Particuology 2012年第4期10卷 503-508页

作者： Haifeng Zhu Liren Wang Pinggui Tang Yongjun Feng Dianqing Li State Key Laboratory of Chemical Resource Engineering Belting University of Chemical TechnologyBeijing 100029China

Incorporation of anions of Acid Red 114 dye （1,3-naphthalenedisulfonic acid, 8-[2-[3,3＇-dimethyl-4＇-[2-[4- [l（4-methylphenyl）sulfonyl]oxy] phenyl]diazenyl] [1,1＇-biphenyl]-4-yl]diazenyl]-7-hydroxy-, disodium salt）（denoted as NPDA） into ZnAl-layered double hydroxides （LDHs） has been carried out by an anion- exchange method in an effort to improve their thermal stability and light fastness. After intercalation of NPDA anions, the interlayer distance of the LDHs increases from 0.87 to 2.18 nm, confirming their incorporation into the interlayer galleries of the LDHs host. Infrared spectroscopy and thermogravimetric analysis revealed the presence of host-guest interactions between LDHs layers and NPDA anions. The thermal stability of NPDA and ZnAI-NPDA-LDHs was compared by thermogravimetric-differential ther- mal analysis, UV-visible spectroscopy and infrared spectroscopy. It was found that the thermal stability of NPDA anions was markedly improved by incorporation into the ZnA1-LDHs matrix, while the light fastness was also enhanced.

关键词： Layered double hydroxidesAnion-exchangeIncorporationThermal stabilityLight fastness

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A comparison on the effects of coal fines and sand fouling on the shear behaviors of railway ballast using large scale direct shear tests

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Journal of Traffic and Transportation Engineering(English Edition) 2023年

作者： Xu Zhang Shunying Ji Yang feng yongjun Li Chunfa Zhao State Key Laboratory of Traction Power， Southwest Jiaotong University State Key Laboratory of Structural Analysis for Industrial Equipment， Dalian University of Technology School of Civil and Transportation Engineering， Guangdong University of Technology

Railway ballast is easily contaminated by different fouling material and the fouled ballast always causes the deterioration of railway track. Many previous studies focused on the effect of a certain kind of fouling material on ballast performance， but few studies compared the influence of different fouling material. This paper presents a series of direct shear tests on the clean ballast and the fouled ballast mixed with coal fines or sand to understand the effects of different fouling material. A unified empirical model is proposed to well capture the shear stress-displacement responses of the clean and fouled ballast. Empirical equations are also obtained to characterize the variation of the nonlinear shear strength envelope of the fouled ballast with the fouling content. Based on these equations， a simple method is proposed to predict the shear strength of the fouled ballast using the shear test results of clean ballast. The measured results demonstrate significant differences between the effects of coal fines and sand on the shear behaviors of ballast， to which particular attention should be paid in order to take targeted maintenance measures for the fouled ballast. The mechanisms for the different effects of coal fines and sand are also analyzed to understand the roles that various fouling material plays in the fouled ballast.

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Dynamic Modeling and Experiment of a New Type of Parallel Servo Press Considering Gravity Counterbalance

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1222-1233页

作者： HE Jun GAO feng BAI yongjun WU Shengfu State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University China First Heavy Industries

The large capacity servo press is traditionally realized by means of redundant actuation, however there exist the over-constraint problem and interference among actuators, which increases the control difficulty and the product cost. A new type of press mechanism with parallel topology is presented to develop the mechanical servo press with high stamping capacity. The dynamic model considering gravity counterbalance is proposed based on the virtual work principle, and then the effect of counterbalance cylinder on the dynamic performance of the servo press is studied. It is found that the motor torque required to operate the press is a lot less than the others when the ratio of the counterbalance force to the gravity of ram is in the vicinity of 1.0. The stamping force of the real press prototype can reach up to 25 MN on the position of 13 mm away from the bottom dead center. The typical deep-drawing process with 1 200 mm stroke at 8 strokes per minute is proposed by means of five order polynomial. On this process condition, the driving torques are calculated based on the above dynamic model and the torque measuring test is also carried out on the prototype. It is shown that the curve trend of calculation torque is consistent to the measured result and that the average error is less than 15%. The parallel mechanism is introduced into the development of large capacity servo press to avoid the over-constraint and interference of traditional redundant actuation, and its dynamic characteristics with gravity counterbalance are presented.

关键词： mechanical press parallel mechanism dynamic modeling virtual work principle

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为高质量培养现代职教强国人才提供坚实理论支撑——《高职院校技能型创新人才培养研究》评介

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职业技术教育 2022年第12期43卷 53-56页

作者：冯用军陕西师范大学教育学部“一带一路”教育高等研究院西安710062 安邦中国评价科学院

高等职业院校是培养技能型、应用型、创新型人才和开展应用型科技研发的根本所在,为实现《中国制造2025》等国家战略提供人才支持和科技支撑。在全面建设社会主义现代化国家新征程中,如何加快构建现代高等职业教育体系,培养更多高素质... 详细信息

高等职业院校是培养技能型、应用型、创新型人才和开展应用型科技研发的根本所在,为实现《中国制造2025》等国家战略提供人才支持和科技支撑。在全面建设社会主义现代化国家新征程中,如何加快构建现代高等职业教育体系,培养更多高素质技术技能人才、能工巧匠、大国工匠,《高职院校技能型创新人才培养研究》就是力图从理论上对上述问题给予诠释、进行解答的新作。该书以高职院校技能型创新人才培养为研究对象,以宁波职业技术学院为典型案例,在调研高职院校人才培养现状基础上,分析其存在的主要问题和影响因素,并借鉴国外高职院校技能型创新人才培养先进经验,提出优化我国高职院校技能型创新人才培养模式的对策建议。

关键词：高职院校高职教育技能型创新人才中国制造职教强国

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Double transition metal atoms anchored on Graphdiyne as promising catalyst for electrochemical nitrogen reduction reaction

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Journal of Materials Science & Technology 2021年第18期77卷 244-251页

作者： Lakshitha Jasin Arachchige yongjun Xu Zhongxu Dai Xiao Li Zhang feng Wang Chenghua Sun School of Chemical Engineering and Energy Technology Dongguan University of TechnologyDongguan 523808China Department of Chemistry and Biotechnology and Centre for Translational Atomaterials.FSETSwinburne University of TechnologyHawthornVictoria 3122Australia Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials.College of Materials and Chemical Engineering China Three Gorges UniversityYichang 443002China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials.School of Materials Science and Engineering Zhengzhou UniversityHenan 450001China

Ammonia synthesis by electrochemical nitrogen reduction technique is an attractive alternative to traditional Haber-Bosch process.Currently,development of an efficient and effective electrocatalyst is one of the remaining key challenges.In this work,density functional theory(DFT)computations were systematically employed on double transition metal atoms(Fe,Co,Ni,Cu and Mo)anchored Graphdiyne(GDY)for nitrogen reduction reaction(NRR).The Co-Ni heteronuclear complex and Mo-Mo homonuclear complex showed the highest NRR activity while demonstrating synergistic effect of double atomic catalytic sites towards the promising NRR activity.

关键词： Double atom catalyst Graphdiyne NRR First-principles calculation

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Targeting proprotein convertase subtilisin/kexin type 9(PCSK9):from bench to bedside

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Signal Transduction and Targeted Therapy 2024年第2期9卷 509-557页

作者： Xuhui Bao yongjun Liang Hanman Chang Tianji Cai Baijie feng Konstantin Gordon Yuekun Zhu Hailian Shi Yundong He Liyi Xie Institute of Therapeutic Cancer Vaccines Fudan University Pudong Medical CenterShanghaiChina Shanghai Key Laboratory of Regulatory Biology School of Life SciencesEast China Normal UniversityShanghaiChina Department of Oncology Fudan University Pudong Medical CenterShanghaiChina Center for Clinical Research Fudan University Pudong Medical CenterShanghaiChina Clinical Research Center for Cell-based Immunotherapy Fudan UniversityShanghaiChina Department of Pathology Duke University Medical CenterDurhamNCUSA Center for Medical Research and Innovation Fudan University Pudong Medical CenterShanghaiChina Institute for Food Safety and Health Illinois Institute of TechnologyChicagoILUSA Department of Sociology University of MacaoTaipaMacaoChina Medical Institute Peoples’Friendship University of RussiaMoscowRussia A.Tsyb Medical Radiological Research Center ObninskRussia Department of Colorectal Surgery The First Affiliated Hospital of Harbin Medical UniversityHarbinHeilongjiangChina Shanghai Key Laboratory of Compound Chinese Medicines Institute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineZhangjiang Hi-tech ParkShanghaiChina Department of Radiation Oncology Fudan University Shanghai Cancer CenterShanghaiChina Department of Oncology Shanghai Medical CollegeFudan UniversityShanghaiChina

Proprotein convertase subtilisin/kexin type 9(PCSK9)has evolved as a pivotal enzyme in lipid metabolism and a revolutionary therapeutic target for hypercholesterolemia and its related cardiovascular diseases(CVD).This comprehensive review delineates the intricate roles and wide-ranging implications of PCSK9,extending beyond CVD to emphasize its significance in diverse physiological and pathological states,including liver diseases,infectious diseases,autoimmune disorders,and notably,cancer.Our exploration offers insights into the interaction between PCSK9 and low-density lipoprotein receptors(LDLRs),elucidating its substantial impact on cholesterol homeostasis and cardiovascular health.It also details the evolution of PCSK9-targeted therapies,translating foundational bench discoveries into bedside applications for optimized patient care.The advent and clinical approval of innovative PCSK9 inhibitory therapies(PCSK9-iTs),including three monoclonal antibodies(Evolocumab,Alirocumab,and Tafolecimab)and one small interfering RNA(siRNA,Inclisiran),have marked a significant breakthrough in cardiovascular medicine.These therapies have demonstrated unparalleled efficacy in mitigating hypercholesterolemia,reducing cardiovascular risks,and have showcased profound value in clinical applications,offering novel therapeutic avenues and a promising future in personalized medicine for cardiovascular disorders.Furthermore,emerging research,inclusive of our findings,unveils PCSK9’s potential role as a pivotal indicator for cancer prognosis and its prospective application as a transformative target for cancer treatment.This review also highlights PCSK9’s aberrant expression in various cancer forms,its association with cancer prognosis,and its crucial roles in carcinogenesis and cancer immunity.In conclusion,this synthesized review integrates existing knowledge and novel insights on PCSK9,providing a holistic perspective on its transformative impact in reshaping therapeutic paradigms across various disorders.It emphasizes the clinical

关键词： PCSK9 metabolism convert

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