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Effect of homojunction structure in boosting sodium-ion storage: The case of MoO_(2)

Journal of Energy Chemistry 2023年第3期78卷 115-122,I0004页

作者： Sheng Li Wei Zhang Yingxue Cui jianmin ma Hong-Jie Peng Jun Li Xianhu Liu Dickon HLNg Xinyan Liu Jiabiao Lian Institute for Energy Research Jiangsu UniversityZhenjiang 212013JiangsuChina School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Key Laboratory of materials Processing&Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina School of Science and Engineering The Chinese University of Hong Kong(Shenzhen)LonggangShenzhen 518172GuangdongChina

High-efficiency sodium-ion batteries(SIBs) are in great demand for energy storage applications,which are dominated by the Na+storage performance of electrode ***,a one-pot solvothermal method is developed to construct amorphous/crystalline MoO_(2)(a/c-MoO_(2)) homojunction for boosting Na+*** simulations signify that electrons redistribute at the homogenous interface of a/c-MoO_(2),resulting in an inbuilt driving force to easily adsorb charge carriers and promote the electron/ion transfer *** on its crystallographic superiorities,the a/c-MoO_(2)homojunction with high Na adsorbability(-1.61 eV) and low Na diffusion energy barrier(0.519 eV) achieves higher capacity(307 ma h g^(-1)at 0.1 A/g),better rate capability and cycling stability than either a-MoO_(2)or c-MoO_(2)*** in-situ X-ray diffraction(XRD) and ex-situ X-ray photoelectron spectroscopy(XPS)techniques,the ’adsorption-insertion-conversion’ mechanism is well established for Na+storage of MoO_(2).Our work opens new opportunities to optimize electrode materials via crystallographic engineering for efficient Na+storage,and helps to better understand the effects of homojunction structure in enhanced electrochemical performance.

关键词： MoO_(2)homojunction Crystallographic engineering Theoretical calculations In-situ XRD Na^(+)storage mechanism

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刍议乡村振兴战略背景下广东省林业创新发展路径

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南方农业 2024年第4期18卷 153-155页

作者：马健敏台山市深井镇农业综合服务中心广东台山529341

乡村振兴战略背景下,创新发展广东省林业势在必行。为给乡村振兴战略在广东省林业发展中的落实提供参考,简单介绍了乡村振兴战略,立足乡村振兴战略的实施背景,探究了乡村振兴战略背景下广东省林业发展要素,并结合广东省林业发展现状及... 详细信息

乡村振兴战略背景下,创新发展广东省林业势在必行。为给乡村振兴战略在广东省林业发展中的落实提供参考,简单介绍了乡村振兴战略,立足乡村振兴战略的实施背景,探究了乡村振兴战略背景下广东省林业发展要素,并结合广东省林业发展现状及主要问题,提出了创新路径。

关键词：乡村振兴林业发展广东省

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Co-doped graphene edge for enhanced N2-to-NH3 conversion

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Journal of Energy Chemistry 2020年第9期29卷 322-327,I0010页

作者： Zengxi Wei Yuezhan Feng jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Key Laboratory of materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina

N2 fixation in atmosphere is an important issue in modern *** an ideal electrochemical nitrogen reduction reaction(NRR)catalyst to overcome the sluggish reaction kinetic and ultralow selectivity is still the significant ***,we screened the potential catalyst to accelerate N2 fixation by designing the single transition metal(TM)atoms(Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Mo,W,Ru and Rh)supported on the edge of *** calculations revealed that the Co atom supported on the graphene edge could selectively stabilize*N2 H species and destabilize*NH2 species,leading to the highest catalytic activity and selectivity for N2 fixation at the ambient *** addition,the enzymatic mechanism of eNNR have the lowest overpotential of 0.72 *** theoretical work will give a new perspective to design an available catalyst for NRR.

关键词： conditions. chemistry. catalyst

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The impact of China’s high-speed rail investment on regional economy and air pollution emissions

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Journal of Environmental Sciences 2023年第9期131卷 26-36页

作者： Qiong Yang Yuqing Wang Ying Liu Junfeng Liu Xiurong Hu jianmin ma Xuejun Wang Yi Wan Jianying Hu Zhaobin Zhang Xilong Wang Shu Tao Laboratory for Earth Surface Processes College of Urban and Environmental SciencesPeking UniversityBeijing 100871China School of Statistics University of International Business and EconomicsBeijing 100029China College of Economics and management Nanjing University of Aeronautics and AstronauticsNanjing 211106China

The high-speed rail(HSR)network in China has experienced rapid development since the *** 2016,the State Council of the People’s Republic of China issued a revised version of the“Mid-and Long-term Railway Network Plan”,detailing the expansion of the railway network and construction of an HSR *** the future,the HSR construction efforts in China will further increase,which is considered to impact regional development and air pollutant ***,in this paper,we apply a transportation network-multiregional computable general equilibrium(CGE)model to estimate the dynamic effects of HSR projects on economic growth,regional disparities,and air pollutant emissions in *** results indicate that HSR system improvement could generate a positive economic impact but could also increase *** gross domestic product(GDP)growth per unit investment cost stimulated by HSR investment is found to be the largest in eastern China but the smallest in the northwest ***,HSR investment in Northwest China contributes to a substantial reduction in regional disparities in terms of the GDP per *** regard to air pollution emissions,HSR construction in South-Central China results in the largest increase in CO_(2) and NO_(X) emissions,while for CO,SO_(2),and fine particulate matter(PM_(2.5))emissions,the largest increase occurs due to HSR construction in Northwest *** the regional level,the provinces with large changes in accessibility also experience large changes in their air pollutant emissions.

关键词： Computable general equilibrium model High-speed rail investment Economic impact Regional disparity Air pollution emissions

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Preface to the Special Issue:Anode materials for Rechargeable Batteries

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 289-290页

作者： jianmin ma Yu-Tao Li School of Physics and Electronics Hunan UniversityChangsha 410082China materials Science and Engineering Program and Texas Materials InstituteThe University of Texas At AustinAustinTX 78712USA

Rechargeable Li-ion batteries were first commercialized in 1991 by Sony company,and the current portable electronic devices and electric vehicles powered by rechargeable batteries have significantly accelerated the development of social *** Nobel Prize in Chemistry 2019 was also awarded jointly to John ***,*** Whittingham,and Akira Yoshino for their outstanding contribution to rechargeable Li-ion batteries.

关键词： charge jointly enough

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Promoted CO2 electroreduction over indium-doped SnP3: A computational study

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Journal of Energy Chemistry 2020年第9期29卷 1-6,I0001页

作者： Yuefeng Zhang Wenchao Zhang Yuezhan Feng jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Institute for Superconducting and Electronic materials(ISEM) School of MechanicalMaterialsMechatronics&Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongNSW 2500Australia Key Laboratory of materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina

It is generally considered that the hydrogenation of CO2 is the critical bottleneck of the CO2 *** this work,with the aid of density functional theory(DFT)calculations,the catalytic hydrogenation of CO2 molecules over Indium-doped SnP3 catalyst were systematically *** doping with indium(In)atom,the energy barrier of CO2 protonation is reduced and OCHO*species could easily be *** is mainly due to the p orbital of In exhibits strong hybridization with the p orbital of O,indicating that there is a strong interaction between OCHO*and In-doped SnP3 *** a result,In-doped SnP3 possesses high-efficiency and high-selectivity for converting CO2 into HCOOH with a low limiting potential of-0.17 *** findings will offer theoretical guidance to CO2 electroreduction.

关键词： CO2 electroreduction SnP3 Indium metal doping Formic acid First principles

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Electrospun CoSe@N-doped carbon nanofibers with highly capacitive Li storage

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Journal of Energy Chemistry 2019年第6期28卷 160-166页

作者： Jiandong Liu Jiaojiao Liang Caiyun Wang jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials ScienceAIIM FacilityUniversity of WollongongNorth WollongongNSW 2500Australia College of Traffic Engineering Hunan University of TechnologyZhuzhou 412001、HunanChina

One-dimensional nano-structured materials have attracted attention due to its unique properties afforded such as the across-linked structures and large aspect *** this work,one-dimensional CoSe@N-doped carbon nanofibers(CoSe@NCNFs)are successfully by combining the techniques of electrospinning and *** powder are directly dispersed in the polyacrylonitrile/N,N-Dimethylformamide(DMF)solution containing cobalt salt to form the *** performance of these materials was investigated in Li-ion batteries after the annealing at different *** Co Se@NC nanofibers annealed at 550℃(CoSe@NC-550)and displayed excellent storage properties,affording a high capacity of 796 m Ah·g-1at a current density of 1 A·g^-1 for 100 ***,it is confirmed that the pseudocapacitive contribution of CoSe@NC-550 is up to 72.8%at the scan rate of 1 mV/s through the cyclic voltammetry analysis.

关键词： CoSe Anode Nanofibers Electrospinning Li-ion batteries

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Twice Q-polynomial distance-regular graphs of diameter 4

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Science China mathematics 2015年第12期58卷 2683-2690页

作者： ma jianmin KOOLEN Jack H. College of mathematics & Information Science and Hebei Key Lab of Computational mathematics & Applications Hebei Normal University School of mathematical Sciences University of Science and Technology of China

It is known that a distance-regular graph with valency k at least three admits at most two Qpolynomial structures. We show that all distance-regular graphs with diameter four and valency at least three admitting two Q-polynomial structures are either dual bipartite or almost dual bipartite. By the work of Dickie(1995) this implies that any distance-regular graph with diameter d at least four and valency at least three admitting two Q-polynomial structures is, provided it is not a Hadamard graph, either the cube H(d, 2)with d even, the half cube 1/2H(2d + 1, 2), the folded cube?H(2d + 1, 2), or the dual polar graph on [2A2d-1(q)]with q 2 a prime power.

关键词：距离正则图多项式直径立方体结构 2D 四价四次

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Bimetallic CoNiSe_(2)/C nanosphere anodes derived from Ni-Co-metal-organic framework precursor towards higher lithium storage capacity

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Chinese Chemical Letters 2023年第2期34卷 534-541页

作者： Weifan Zhang Lei Wang Guochun Ding Yuejia Yang Guang Yang Jing Xu Ningning Xu Lingling Xie Qing Han Limin Zhu Xiaoyu Cao jianmin ma School of Chemistry and Chemical Engineering Henan University of TechnologyZhengzhou 450001China School of Environmental Engineering Henan University of TechnologyZhengzhou 450001China Key Laboratory of High Specific Energy materials for Electrochemical Power Sources of Zhengzhou City Henan University of TechnologyZhengzhou 450001China School of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

Through uncomplicated carbonation process,a carbon-embedded CoNiSe_(2)/C nanosphere was synthesized from Ni-Co-MOF (metal-organic framework) precursor whose controllable structure and synergistic effect of bimetallic Ni/Co brought CoNiSe_(2)/C anodes with high specific surface area (172.79 m^(2)/g) and outstanding electrochemical ***_(2)/C anodes obtained reversible discharge capacities of850.9 mah/g at 0.1 A/g after cycling for 100 *** addition,CoNiSe_(2)/C exhibits excellent cycle stability and reversibility in the rate test at a current density of 0.1–2.0 A/*** the current density returns to 0.5 A/g for 150 cycles,its discharge ratio the capacity is 330.8 m Ah/*** impedance spectroscopy (EIS) tests suggested that CoNiSe_(2)/C anodes had a lower charge transfer impedance of 130.02Ωafter 30 ***-situ X-ray diffraction (XRD) tests confirmed the alloying mechanism of CoNiSe_(2)/C which realized higher lithium storage *** work affords substantial evidence for the extension of bimetallic selenides in secondary batteries,promoting the development of bimetallic selenides in anode materials for LIBs.

关键词： MOFs Bimetallic compound CoNiSe_(2)/C anode nanosphere Lithium-ion batteries Lithium storage performance

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Strain engineering the D-band center for Janus MoSSe edge: Nitrogen fixation

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Journal of Energy Chemistry 2019年第6期28卷 155-159页

作者： Xi Tang Zengxi Wei Quanhui Liu jianmin ma School of Physics and Electronics Hunan UniversityChangsha 410082 HunanChina Institute of Advanced Electrochemical Energy Xi'an University of TechnologyXi'an 710048 ShaanxiChina

Nitrogen fixation is one of the most important and challenging process in production of ammonia at ambient temperature. We have first performed density function theory to propose the edge of Janus MoSSe(EJM) monolayer as a potential catalyst for nitrogen reduction reaction. Our results show that the superficial D-band centers play an important role in nitrogen fixation. The strain effects greatly alter the D-band center, and further change the interaction between the adsorbates and the surface of *** findings provide a new thought into designing transition-metal chalcogenide catalysts for nitrogen fixation.

关键词： Nitrogenfixation Electrocatalysis Janus MoSSe Strain engineering Density function theory

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