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N/S co-doped Nb_(2)CT_(x)MXene as the effective catalyst for improving the hydrogen storage performance of MgH_(2)

Journal of Materials Science & Technology 2024年第23期190卷 135-144页

作者： Heng lu Jianbo Li Xiang Zhou yangfan lu Yu’an Chen Qian Li Fusheng Pan College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400045China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400045China

While MgH_(2)has high hydrogen storage capacity,its high dehydrogenation temperature and sluggish de-/hydrogenation rate have hindered practical *** the present work,a non-metallic element(N,S)co-doped Nb_(2)CT_(x)MXene catalyst(N/S-Nb_(2)CT_(x))is employed to improve the hydrogen storage prop-erty of MgH_(2).The dehydrogenation activation energy of MgH_(2)+N/S-Nb_(2)CT_(x)composite is reduced to 70.00 kJ mol^(-1)H_(2),which is much lower than that of MgH_(2)+Nb_(2)CT_(x)(99.44 kJ mol^(-1)H_(2))and Milled-MgH_(2)(133.19 kJ mol^(-1)H_(2)).The composite can release about 4.78 wt%of H_(2)within 30 min at 225℃and uptake about 4.00 wt%of H_(2)within 80 min even at 30℃under 30 bar H_(2),which is significantly bet-ter than most of the reported MgH_(2)+Nb-based-catalyst *** mechanism analysis reveals that the stable layered structure of the N/S-Nb_(2)CT_(x)catalyst provides enough nucleation sites for MgH_(2)/Mg,and the in-situ formed substances(Nb,NbO 2)play the role of elongating Mg-H ***,the N,S co-doped effectively enhances the ability of multivalent Nb elements to promote the electron transfer between Mg^(2+)and H^(-),and it promotes the diffusion of hydrogen through weakening the interaction be-tween Nb and H atoms,thus the de-/hydrogenation kinetics and cyclic stability of MgH_(2)is significantly *** work not only proves that Nb_(2)CT_(x)can effectively enhance its catalytic activity by N and S co-doping,but also provides a MXene-based catalyst design concept for highly efficient hydrogen storage catalysts.

关键词： Hydrogen storage Magnesium hydride Nb_(2)CT_(x)MXene Catalytic mechanism

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Enhancing hydrogen storage properties of MgH_(2) using FeCoNiCrMn high entropy alloy catalysts

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Journal of Materials Science & Technology 2023年第18期149卷 88-98页

作者： Haiyi Wan Xiu Yang Shiming Zhou Lei Ran yangfan lu Yu’an Chen Jingfeng Wang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Guangdong Guoyan Science and Technology Research Center Co. LtdGuangdong 518000China

Herein,we report the successful preparation of the FeCoNiCrMn high entropy alloy(HEA)loaded MgH_(2) and HEA’s effect on the hydrogen storage properties of Mg/MgH_(2).The HEA shows high catalytic activity toward hydrogen dissociation and recombination reaction,and successfully suppressed activation energy of dehydrogenation reaction from 151.9 to 90.2 kJ ***,part of Co and Ni can react with Mg,and produce Mg_(2) Co/Mg_(2) CoH 5 and Mg_(2) Ni/Mg_(2) NiH_(4) during the hydrogen storage processes,further en-hancing dehydrogenation reaction through the“hydrogen pumping”*** result,the MgH_(2)-5 wt%HEA composite can release 5.6 wt%of H_(2) at 280℃ within 10 min,and absorb 5.5 wt%H_(2) within 0.5 min at 150℃.The loaded HEA shows robustness against particle aggregation,leading to stable re-versible hydrogen storage processes at least 50 *** findings show the synergistic effects of HEA on Mg-based hydrogen storage materials,providing an additional degree of freedom for catalyst design.

关键词： Hydrogen storage Magnesium hydride High entropy alloy Catalytic effects

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Improved hydrogen storage kinetics of MgH_(2) using TiFe_(0.92)Mn_(0.04)Co_(0.04) with in-situ generated α-Fe as catalyst

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Materials Reports(Energy) 2024年第1期4卷 95-103页

作者： Zefeng Li yangfan lu Jingfeng Wang Yu'an Chen Qian Li Fushen Pan College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing400044PR China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing400044PR China Chongqing Institute of New Energy Storage Materials and Equipment Chongqing401135PR China

While TiFe alloy has recently attracted attention as the efficient catalyst to enhance de/hydrogenation rates of Mg/MgH_(2),the difficulty of its activation characteristics has hindered further improvement of reaction ***,we report that the TiFe_(0.92)Mn_(0.04)Co_(0.04) catalyst can overcome the abovementioned *** synthesized MgH_(2)-30 wt% TiFe_(0.92)Mn_(0.04)Co_(0.04) can release 4.5 wt%of hydrogen in 16 min at 250℃,three times as fast as MgH_(2).The activation energy of dehydrogenation was as low as 84.6 kJ mol^(-1),which is 46.8%reduced from pure MgH_(2).No clear degradation of reaction rates and hydrogen storage capacity was observed for at least 30 *** studies reveal that TiFe_(0.92)Mn_(0.04)Co_(0.04) partially decomposes to in-situ generatedα-Fe particles dispersed on TiFe_(0.92)Mn_(0.04)Co_(0.04).The presence ofα-Fe reduces the formation of an oxide layer on TiFe_(0.92)Mn_(0.04)Co_(0.04),enabling the activation *** the same time,the hydrogen incorporation capabilities of TiFe_(0.92)Mn_(0.04)Co_(0.04) can provide more hydrogen diffusion paths,which promote hydrogen dissociation and *** discoveries demonstrate the advanced nature and importance of combining the in-situ generatedα-Fe with TiFe_(0.92)Mn_(0.04)Co_(0.04).It provides a new strategy for designing highly efficient and stable catalysts for Mg-based hydrogen storage materials.

关键词： Hydrogen storage materials Magnesium De/hydrogenation kinetics Catalyst

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Tuning the reaction path of CO_(2) electroreduction reaction on indium single-atom catalyst:Insights into the active sites

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Nano Research 2022年第5期15卷 4014-4022页

作者： Jiawei Zhang Gangming Zeng Lanlan Chen Wenchuan Lai Yuliang Yuan yangfan lu Chao Ma Wenhua Zhang Hongwen Huang College of Materials Science and Engineering Advanced Catalytic Engineer Research Center of the Ministry of EducationHunan UniversityChangsha 410082China Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of SciencesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China State Key Lab of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Modulating the local coordination structure of metal single-atom catalysts(SACs)is extensively employed to tune the catalytic activity,but rarely involved in regulating the reaction pathway which fundamentally determines the product ***,we report that the product selectivity of electrochemical CO_(2)reduction(CO_(2)RR)on the single-atom indium-NxC4-x(1≤x≤4)catalysts could be tuned from formate to CO by varying the carbon and nitrogen occupations in the first coordination ***,the optimal In SAC showed great promise for CO production with the maximum Faradic efficiency of 97%,greatly different from the reported In-based catalysts where the formate is the dominant *** experimental verifications and theoretical simulations reveal that the selectivity switch from formate to CO on In SACs originates from active sites shift from indium center to the indium-adjacent carbon atom,where the indium site favors formate formation and the indium-adjacent carbon site prefers the CO *** present work suggests the active sites in metal SACs may shift from the widely accepted metal center to surrounding carbon atoms,thereby offering a new implication to revisit the active sites for metal SACs.

关键词： CO_(2)reduction single atom catalysts coordination structure product selectivity active sites shift

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N-doped CoO nanowire arrays as efficient electrocatalysts for oxygen evolution reaction

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Journal of Energy Chemistry 2019年第10期28卷 13-17页

作者： Kaili Zhang Xinhui Xia Shengjue Deng Dong Xie yangfan lu Yadong Wang Jianbo Wu Xiuli Wang Jiangping Tu State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Provinceand School of Materials Science & EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Guangdong Engineering and Technology Research Center for Advanced Nanomaterials School of Environment and Civil EngineeringDongguan University of TechnologyDongguan 523808GuangdongChina School of Engineering Nanyang Polytechnic569830Singapore Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityTaizhou 318000ZhejiangChina

Rational design of cost-effective high-performance electrocatalysts for oxygen evolution reaction (OER) is of great significance for electrochemical water splitting. Herein, we adopt a nitrogen doping method to fabricate self-supported N-doped CoO nanowire arrays (N-CoO) as active electrocatalysts via a facile hydrothermal combined doping method. The N-CoO nanowires are strongly composited with the carbon cloth substrate forming free-standing electrode with reinforced stability and high electronic conductivity. Owing to the increased accessible and electroactive areas, rich/short pathways for charge transfer and enhanced electronic conductivity, the N-CoO electrode exhibits excellent electrocatalytic performance for OER with a low overpotential (319 mV at 10 mA cm^-2 and 410 mV at 100 mA cm^-2) and a low Tafel slope of 74 mV dec^-1 as well as superior long-term stability with no decay in 24 h continuous test in alkaline solution. Our reported design and optimization strategy provide a promising way to construct interesting well-aligned arrays for application in energy storage and conversion.

关键词： Oxygen evolution reaction Nanowires Electrocatalysis Porous structure Cobalt Oxides

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Crystal-phase-controlled PtSn intermetallic nanowires for efficient methanol oxidation

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Science China Chemistry 2024年第12期67卷 4142-4148页

作者： Siyu Cao Mengfan Li Zihan Guo Li Gong yangfan lu Wenhua Zhang Yu Ni Lei Gao Chao Ma Hongwen Huang College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Zhejiang Provincial Engineering Research Center of Oxide Semiconductors for Environmental and Optoelectronic Applications Institute of WenzhouZhejiang UniversityWenzhou 325006China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China China Power Engineering Consulting Group Co. LTDBeijing 100120China Shenzhen Research Institute of Hunan University Shenzhen 518055China

Developing highly efficient Pt-based methanol oxidation reaction(MOR)catalysts is pivotal for direct methanol fuel *** engineering of nanomaterials offers a promising strategy to improve their catalytic performance,yet achieving phase modulation in one-dimensional nanowires(NWs)remains a great ***,we report a facile and one-pot synthesis approach for the crystal-phase-controlled Pt-Sn intermetallic nanowires(NWs),realizing the crystal-phases regulation of face-centered cubic Pt_(3)Sn intermetallic NWs(FCC-Pt_(3)Sn INTNWs)and hexagonal close-packed Pt Sn intermetallic NWs(HCP-PtSn INTNWs)by adjusting the amounts of Sn ***,the FCC-Pt_(3)Sn INTNWs exhibit high mass and specific activities of 6.4 A mg_(Pt)^(-1)and 11.8 mA cm^(-2),respectively,surpassing its counterparts,the HCP-PtSn INTNWs and commercial Pt/C *** a 10,000 s durability test,the FCC-Pt_(3)Sn INTNWs still maintain a mass activity of 5.6 A mg_(Pt)^(-1),which is 24.3 times higher than that of commercial Pt/C *** dramatic enhancement of MOR performance is primarily attributed to the phasecontrolled structure and accelerated removal of CO intermediates(CO*).Theoretical calculations and CO stripping experiments demonstrate that the FCC-Pt_(3)Sn INTNWs lower the energy barrier for converting CO*into COOH*by reducing CO*binding and enhancing OH adsorption,thus significantly improving the MOR activity,CO tolerance,and stability.

关键词： Pt-Sn intermetallic nanowires crystal phase methanol oxidation reaction anti-CO poisoning

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Unlocking the charge doping effect in softly intercalated ultrathin ferromagnetic superlattice

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eScience 2023年第3期3卷 105-114页

作者： Liang Hu Bingzhang Yang Zhipeng Hou yangfan lu Weitao Su Lingwei Li Key Laboratory of Novel Materials for Sensor of Zhejiang Province College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou310018PR China State Key Lab of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027PR China South China Academy of Advanced Optoelectronics South China Normal UniversityGuangzhou510006PR China

The electrolyte-assisted exfoliation strategy is widely employed to synthesize ultrathin two-dimensional(2D)***,spins in 2D magnets are susceptible to the electrolyte due to the underlying charge doping ***,it is crucial to understand and trace the doping process during the delamination of 2D *** the prototype Fe_(3)GeTe_(2),we utilized soft organic cations to exfoliate the bulk and obtain a freestanding organ-ic–inorganic hybrid superlattice with a giant electron doping effect as high as 6.9×10^(14)/cm^(2)(~1.15 electrons per formula unit).A remarkable ferromagnetic transition exceeding 385 K was revealed in these superlattices,together with unique anisotropic saturation *** doping enhanced the in-plane electron–phonon coupling and thus optimized originally poor indirect double-exchange scenario for spin *** emerging vertical magnetization shift phenomenon served to evaluate the uniformity of charge *** above findings provide a new perspective for understanding the role of parasitic charge in 2D magnetism.

关键词： Van der waals magnet Electrochemical exfoliation Hybrid superlattice Electron doping Exchange bias Spintronics

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Tailoring MgH_(2) for hydrogen storage through nanoengineering and catalysis

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Journal of Magnesium and Alloys 2022年第11期10卷 2946-2967页

作者： Zhao Ding Yuting Li Hang Yang yangfan lu Jun Tan Jianbo Li Qian Li Yu'an Chen Leon L.Shaw Fusheng Pan College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China The State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081China Department of Mechanical Materials and Aerospace EngineeringIllinois Institute of TechnologyChicago 60616United States

Hydrogen energy has been recognized as “Ultimate Power Source” in the 21st century, which could be the best solution to the looming energy crisis and climate degeneration in the near future. Due to its high safety, low price, abundant resources and decent hydrogen storage density, magnesium based solid-state hydrogen storage materials are becoming the leading candidate for onboard hydrogen storage. However,the high operation temperature and slow reaction rate of MgH_(2), as a result of the large formation enthalpy and high reaction activation energy,respectively, are the first and most difficult problems we need to face and overcome to realize its industrialization. Herein, a state-of-the-art review on tailoring the stable thermodynamics and sluggish kinetics of hydrogen storage in MgH_(2), particularly through nanoengnieering and catalysis is presented, aiming to provide references and solutions for its promotion and application. Promising methods to overcome the challenges faced by MgH_(2)/Mg, such as bidirectional catalysts and nanoconfinement with in-situ catalysis are compared and the required improvements are discussed to stimulate further discussions and ideas in the rational design of MgH_(2)/Mg systems with ability for hydrogen release/uptake at lower temperatures and cycle stability in the near future.

关键词： Hydrogen storage materials MgH_(2) Nanoengineering Catalysis Hydrogen release Hydrogen uptake

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Mechanotransduction pathways in articular chondrocytes and the emerging role of estrogen receptor-α

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Bone Research 2023年第2期11卷 229-247页

作者： Ning Wang yangfan lu Benjamin B.Rothrauff Aojie Zheng Alexander Lamb Youzhen Yan Katelyn E.Lipa Guanghua Lei Hang Lin Department of Orthopaedic Surgery Xiangya HospitalCentral South UniversityChangsha 410008 HunanChina Department of Orthopaedic Surgery University of Pittsburgh School of MedicinePittsburghPA15219USA Department of Bioengineering University of Pittsburgh Swanson School of EngineeringPittsburghPA15219USA and Mc Gowan Institute for Regenerative Medicine University of Pittsburgh School of MedicinePittsburghPA15219USA

In the synovial joint,mechanical force creates an important signal that influences chondrocyte *** conversion of mechanical signals into biochemical cues relies on different elements in mechanotransduction pathways and culminates in changes in chondrocyte phenotype and extracellular matrix composition/***,several mechanosensors,the first responders to mechanical force,have been ***,we still have limited knowledge about the downstream molecules that enact alterations in the gene expression profile during mechanotransduction ***,estrogen receptorα(ERα)has been shown to modulate the chondrocyte response to mechanical loading through a ligand-independent mechanism,in line with previous research showing that ERαexerts important mechanotransduction effects on other cell types,such as *** consideration of these recent discoveries,the goal of this review is to position ERαinto the mechanotransduction pathways known to ***,we first summarize our most recent understanding of the mechanotransduction pathways in chondrocytes on the basis of three categories of actors,namely mechanosensors,mechanotransducers,and ***,the specific roles played by ERαin mediating the chondrocyte response to mechanical loading are discussed,and the potential interactions of ERαwith other molecules in mechanotransduction pathways are ***,we propose several future research directions that may advance our understanding of the roles played by ERαin mediating biomechanical cues under physiological and pathological conditions.

关键词： structure loading directions

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Strain engineering of anisotropic light-matter interactions in onedimensional P-P chain of SiP_(2)

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Nano Research 2022年第8期15卷 7378-7383页

作者： Fanghua Cheng Junwei Huang Feng Qin Ling Zhou Xueting Dai Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Caiyu Qiu yangfan lu Huiyang Gou Hongtao Yuan National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied SciencesNanjing UniversityNanjing 210000China College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400030China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

Strain engineering can serve as a powerful technique for modulating the exotic properties arising from the atomic structure of *** have been demonstrated that one-dimensional(1D)structure can serve as a great platform for modulating electronic band structure and phonon dispersion via strain ***,in a van der Waals material silicon diphosphide(SiP_(2)),quasi-1D zigzag phosphorus–phosphorus(P–P)chains are embedded inside the crystal structure,and can show unique phonon vibration modes and realize quasi-1D *** those optical properties by the atom displacements via strain engineering is of great interest in understanding underlying mechanism of such P–P chains,however,which remains ***,we demonstrate the strain engineering of Raman and photoluminescence(PL)spectra in quasi-1D P–P chains and resulting in anisotropic manipulation in SiP_(2).We find that the phonon frequencies of SiP_(2)in Raman spectra linearly evolve with a uniaxial strain along/perpendicular to the quasi-1D P–P chain ***,by applying tensile strain along the P–P chains,the band gap energy of strained SiP_(2)can significantly decrease with a tunable value of~55 *** on arsenic(As)element doping into SiP_(2),the strain-induced redshifts of phonon frequencies decrease,indicating the stiffening of the phonon vibration with the increased arsenic doping *** results provide an opportunity for strain engineering of the light–matter interactions in the quasi-1D P–P chains of SiP_(2)crystal for potential optical applications.

关键词： strain engineering silicon diphosphide Raman photoluminescence

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