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Chinese Chemical Letters 2024年第7期35卷 428-432页

作者： Yiyue Ding Qiuxiang Zhang Lei Zhang Qilu Yao Gang Feng Zhang-Hui lu Key Laboratory of Energy Catalysis and Conversion of Nanchang College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China School of Chemistry and Chemical Engineering Nanchang UniversityNanchang 330031China

Formic acid(FA),which is obtainable through CO_(2)hydrogenation with green hydrogen or biomass conversion,has been used as a prospective liquid organic hydrogen carrier(LOHC)because of the abundant advantages of renewability,wide availability,stability,and high volumetric capacity(53 g H_(2)/L).The development of highly efficient catalytic systems to achieve enhanced catalytic activity is attractive but still ***,ultrafine and highly dispersed PdAu nanoclusters(NCs)anchored on amino-modified reduced graphene oxide(ArGO)were successfully synthesized via a facile impregnation-reduction method and applied as a catalyst toward formic acid dehydrogenation(FAD).Benefiting from the promoting effect of amino groups,the strain and ligand effect in the alloy,and the mott–Schottky effect between PdAu NCs and ArGO,the resultant PdAu/ArGO affords an ultrahigh activity under visible light irradiation with an exceptional turnover frequency value of 10,699.5 h^(-1)at 298 K without any additives,more than 2.6times improvement than that under dark,which is the highest among all reported catalysts under the same *** study provides a green and convenient strategy for developing more efficient and sustainable FAD catalysts and promotes the effective utilization of FA as a prospective renewable LOHC.

关键词： Visible-light-enhanced Hydrogen production Formic acid Pd-Au Heterogeneous catalyst

Strong electron correlation-induced mott-insulating electrides of Ae_(5)X_(3)(Ae=Ca,Sr,and Ba;X=As and Sb)

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Matter and Radiation at Extremes 2024年第3期9卷 74-82页

作者： Ya Xu lu Zheng Yunkun Zhang Zhuangfei Zhang QianQian Wang Yuewen Zhang Liangchao Chen Chao Fang Biao Wan Huiyang Gou Key Laboratory of Material Physics of Ministry of Education School of Physics and Laboratory of Zhongyuan LightZhengzhou UniversityZhengzhou 450052China School of mechanical and Equipment Engineering Hebei University of EngineeringHandan 056038China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

The presence of interstitial electrons in electrides endows them with interesting attributes,such as low work function,high carrier concentration,and unique magnetic *** knowledge and understanding of electrides are thus of both scientific and technological ***,we employ first-principles calculations to investigate mott-insulating Ae_(5)X_(3)(Ae=Ca,Sr,and Ba;X=As and Sb)electrides with Mn_(5)Si_(3)-type structure,in which half-filled interstitial electrons serve as ions and are *** mott-insulating property is induced by strong electron correlation between the nearest interstitial electrons,resulting in spin splitting and a separation between occupied and unoccupied *** half-filled antiferromagnetic configuration and localization of the interstitial electrons are critical for the mott-insulating properties of these *** with that in intermetallic electrides,the orbital hybridization between the half-filled interstitial electrons and the surrounding atoms is weak,leading to highly localized magnetic centers and pronounced correlation ***,the mott-insulating electrides Ae_(5)X_(3)have very large indirect bandgaps(0.30 eV).In addition,high pressure is found to strengthen the strong correlation effects and enlarge the *** present results provide a deeper understanding of the formation mechanism of mott-insulating electrides and provide guidance for the search for new strongly correlated electrides.

关键词： intermetallic filled occupied

Apically guiding electron/mass transfer reaction induced by Ag/FeN_(x)mott-Schottky effect within a hollow star reactor toward high performance zinc-air batteries

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Journal of Energy Chemistry 2024年第8期95卷 106-116,I0004页

作者： Kaixiang Shi Kaixin Wang Tong Li Junhao Li Jie Ren Xu Li Yonggang Min Zhouguang lu Wei Tan Quanbing Liu Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center(Rongjiang Laboratory) Guangdong University of TechnologyJieyang 515200GuangdongChina Guangzhou Key Laboratory of Clean Transportation Energy Chemistry Guangdong Provincial Key Laboratory of Plant Resources BiorefinerySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006GuangdongChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158HainanChina School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

The disparity in the transfer of carriers(electrons/mass)during the reaction in zinc-air batteries(ZABs)results in sluggish kinetics of the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),along with elevated overpotentials,thereby imposing additional constraints on its ***,the pre-design and target-development of inexpensive,high-performance,and long-term stable bifunctional catalysts are urgently *** this work,an apically guiding dual-functional electrocatalyst(Ag-FeN_(x)-N-C)was prepared,in which a hierarchical porous nitrogen-doped carbon with three-dimensional(3D)hollow star-shaped structure is used as a substrate and high-conductivity Ag nanoparticles are coupled with iron nitride(FeN_(x))*** calculations indicate that the mott-Schottky heterojunction as an inherent electric field comes from the two-phase bound of Ag and FeN_(x),of which electron accumulation in the FeN_(x)phase region and electron depletion in the Ag phase region promote orientated-guiding charge *** effective modulation of local electronic structures felicitously reforms the d-band electron-group distribution,and intellectually tunes the masstransfer reaction energy barriers for both ORR/***,the hollow star-s haped hierarchical porous structure provides an apical region for fast mass *** results show that the halfwave potential for ORR is 0.914 V,and the overpotential for OER is only 327 mV at 10 mA cm^(-2).A rechargeable ZAB with Ag-FeN_(x)-N-C as the air cathode demonstrates long-term cycling performance exceeding 1500 cycles(500 h),with a power density of 180 mW cm^(-2).Moreover,when employing AgFeN_(x)-N-C as the air cathode,flexible ZABs demonstrate a notable open-circuit voltage of 1.42 V and achieve a maximum power density of 65.6 mW cm^(-2).Ag-FeN_(x)-N-C shows guiding electron/mass transfer route and apical reaction microenvironment for the electrocatalyst architecture in the explo

关键词： Hollow star structure mott-Schottky effect Apically guiding effect Bifunctional catalysis Zinc-air batteries

激光选区熔化316L不锈钢在酸性氯离子溶液中的钝化行为

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材料研究学报 2024年第3期38卷 221-231页

作者：李飞阳刘志红乔岩欣杨兰兰卢道华汤雁冰江苏科技大学材料科学与工程学院镇江212003 江苏科技大学海洋装备研究院镇江212003

对激光选区熔化316L不锈钢(SLM 316L)进行开路电位、电化学阻抗、动电位极化、恒电位极化、暂态电流-时间测量以及mott-Schottky、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和电子背散射衍射(EBSD)等表征,与商用轧制316L不锈钢(R 316L... 详细信息

对激光选区熔化316L不锈钢(SLM 316L)进行开路电位、电化学阻抗、动电位极化、恒电位极化、暂态电流-时间测量以及mott-Schottky、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和电子背散射衍射(EBSD)等表征,与商用轧制316L不锈钢(R 316L)对比研究其在0.05 mol/L H_(2)SO_(4)+0.2 mol/L NaCl溶液环境中的钝化行为。结果表明:这两种钢钝化膜的形核机制均为连续形核,但是SLM 316L不锈钢的晶粒更小、晶界密度更高、钝化膜生长得更快。SLM 316L不锈钢发生过钝化溶解但是不发生点蚀,而R316L不锈钢发生点蚀。SLM316L不锈钢的耐蚀性能更优,因为其为均一的奥氏体相且有大量的小角度晶界;同时,表面生成的钝化膜中的O^(2-)/OH^(-)比值更低、载流子浓度更低、Cr_(2)O_(3)的含量更高和NiO含量更低,对钝化膜的保护效果更好,使其具有优异的耐点蚀性能。

关键词：材料失效与保护钝化行为电化学测试 316L不锈钢

Effect of chloride ions on 316L stainless steel in cyclic cooling water

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Acta metallurgica Sinica(English Letters) 2010年第6期23卷 431-438页

作者： Zuojia LIU Xuequn CHENG Shengjie lu Xiaogang LI Key Laboratory of Corrosion and Protection (Mi-nistry of Education of China University of Science and Technology Beijing Beijing 100083 China Equipment and Power Department Shijiazhuang Refine N: Chemical Company Limited SINOPEC Shijiazhuang 050032 China

The effect of Cl^- on the 316L stainless steel in simulated cooling water has been studied using polarization curves, electrochemical impedance spectroscopy （EIS）, mott- Schottky plot and scanning electron microscopy （SEM） techniques. Cl^- concentrations vary from 200 to 900 mg/L. Results reveal that the corrosion resistance increases with the decrease of Cl^- concentration in simulated cooling water. The increase of Cl^- concentration leads to the shift of the corrosion potential towards the positive direction. mott-Schottky curves show that in the passive film, Cr2Oa and FeO at the inner layer exhibit P-type but Fe2O3 and CrOa （CrO4^2-） N-type semiconductive properties. The SEM/EDX data demonstrate that elements such as Fe, O, C, Si and Cl as well as the presence of calcium and aluminum are presented on the surface of the metal.

关键词： Polarization curve EIS mott-Schottky plot SEM/EDX Simulated cyclic cooling water

Corrosion of Nickel-based Alloy G30 in the Stratum Water Containing H2S/CO2

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Chemical Research in Chinese Universities 2014年第3期30卷 500-508页

作者： CHANG Yanrong lu mei WANG Shangwei TANG Fan Research Center for Ultra-low Permeability Reservoirs PetroChina Changqing Oilfield Company Xi 'an 710018 P. R. China

The influences of temperature and CO2 pressure on the corrosion of nickel-based alloy G30 in the stratum water containing H2S/CO2 were investigated with the aid mott-Schottky analysis and scanning electron microscopy（SEM） of electrochemical impedance spectroscopy（EIS）, The results indicate that alloy G30 is in the passive state in the stratum water, which is related to the formation of the passive film on its surface. This passive film can significantly protect the substrate from further corrosion. And the film protection is enhanced with decreasing temperature and CO2 pressure. Auger electron spectrometry（AES） and X-ray photoelectron spectrometry（XPS） results reveal that the passive film shows the double-layer structure, i.e. the inner chromium oxide and the outer iron/nickel spinel oxides or hydroxides with Mo oxides dispersing throughout the inner and outer scale.

关键词： Nickel-based alloy Stratum water Corrosion Passive film Double-layer structure

Investigation of the deterioration of passive films in H_2S-containing solutions

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矿物冶金与材料学报：英文版 2017年第8期24卷 943-953页

作者： Zhu Wang Lei Zhang Xian Tang Zhao-yang Cui Jun-peng Xue Min-xu lu Institute of Advanced Materials and Technology University of Science and Technology Beijing Safetech Research Institute

The effect of H_2S on the corrosion behavior of 316 L stainless steel was investigated using electrochemical methods by changing the gas condition from CO_2 to H_2S and then back to CO_2. The presence of H_2S showed an acceleration effect on the corrosion of 316 L stainless steel in comparison with CO_2. The acceleration effect remained even after the complete removal of H_2S by CO_2, indicating that the passive film was irreversibly damaged. X-ray photoelectron spectroscopy(XPS) analysis indicated that the passive film was composed of Cr_2O_3, Fe_2O_3, and FeS_2 after being immersed in H_2S-containing solutions. The semiconducting property of the passive film was then investigated by using the mott–Schottky approach. The presence of sulfides resulted in higher acceptor and donor densities and thus was responsible for the deterioration of passive films.

关键词： stainless steel passive films hydrogen sulfide corrosion

钆、氟掺杂二氧化钒的晶体结构演变行为与相变机理

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原子与分子物理学报 2024年第4期41卷 159-166页

作者：曲道宇栾敬德刘文刚可欣烟征陶佳璐沈阳航空航天大学能源与环境学院沈阳110136 东北大学资源与土木工程学院沈阳110167 辽宁省计量科学研究院沈阳110006

二氧化钒(VO_(2))是一种热致相变材料,其过高的相变温度制约了其潜在应用.元素掺杂能够使VO2的能带结构、态密度、键长和晶胞体积等晶格参数改变,引起其相变行为的变化.借助Materials Studio软件,基于第一性原理和分子轨道理论研究了钆... 详细信息

二氧化钒(VO_(2))是一种热致相变材料,其过高的相变温度制约了其潜在应用.元素掺杂能够使VO2的能带结构、态密度、键长和晶胞体积等晶格参数改变,引起其相变行为的变化.借助Materials Studio软件,基于第一性原理和分子轨道理论研究了钆、氟掺杂二氧化钒的晶体结构演变行为与相变机理.结果表明,无论F掺杂于VO_(2)(M型)中间O的位置还是两侧O位置,都会引起O-O键收缩,V-V键增长,β角增大,体系亥姆霍自由能增加,带隙相对减小,F侧位掺杂效果最好,随着V^(4+)-V^(4+)同极结合的减少,在1 at%F掺杂时相变温度达到最低;当Gd以0-1.8 at%掺杂于VO_(2)(M)中V位置时,O-O键和V—V键发生收缩,β角减小,亥姆霍自能增加,带隙减小,Gd 4f态与tⅡ轨道重合,使相变能垒变低,相变温度显著降低.钆、氟两种元素掺杂VO2相变机理更符合Peierls-mott协同相变.

关键词：二氧化钒元素掺杂晶体结构演变第一性原理密度泛函理论相变机理

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3.5%NaCl环境中S32205双相不锈钢与N09925镍基合金的钝化膜特征及耐蚀性

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腐蚀与防护 2024年第6期45卷 15-20页

作者：卢道胜刘慧枫孙永涛董社霞杜宇峰林学强中海油田服务股份有限公司天津分公司天津300451 中国石油大学(华东)材料科学与工程学院青岛266580

采用莫特肖特基(mott-Schottky)分析方法、电化学阻抗谱(EIS)和X射线光电子能谱(XPS)等,对比研究了S32205双相不锈钢和N09925镍基合金在3.5%NaCl溶液中的钝化膜特征和耐蚀性。结果表明:N09925镍基合金表面钝化膜的缺陷密度低于S32205双... 详细信息

采用莫特肖特基(mott-Schottky)分析方法、电化学阻抗谱(EIS)和X射线光电子能谱(XPS)等,对比研究了S32205双相不锈钢和N09925镍基合金在3.5%NaCl溶液中的钝化膜特征和耐蚀性。结果表明:N09925镍基合金表面钝化膜的缺陷密度低于S32205双相不锈钢,两种材料表面的钝化膜中均存在Fe和Cr元素富集,主要成分为Cr和Fe的氧化物和氢氧化物;S32205双相不锈钢表面钝化膜中含有少量金属Ni,N09925镍基合金表面钝化膜中Ni含量较高,还含有Ni的氧化物和氢氧化物;N09925镍基合金的阻抗值更高,其膜层电阻和电荷传递电阻均高于S32205双相不锈钢,N09925镍基合金表面钝化膜的保护性高于S32205双相不锈钢。

关键词： S32205双相不锈钢 N09925镍基合金钝化膜电化学测试 X射线光电子能谱(XPS)

Growth of high quality Sr2IrO4 epitaxial thin films on conductive substrates

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Chinese Physics B 2019年第7期28卷 490-494页

作者： Hui Xu Zhangzhang Cui Xiaofang Zhai Yalin lu Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China Synergy Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China

Ruddlesden–Popper iridium oxides have attracted considerable interest because of the many proposed novel quantum states that arise from the large spin–orbit coupling of the heavy iridium atoms in them.A prominent example is the single layer Sr2IrO4, in which superconductivity has been proposed under electron ***, the synthesis of Sr2IrO4 high quality thin films has been a huge challenge due to the easy formation of impurities associated with different numbers of SrO *** techniques to optimize the growth of pure phase Sr2IrO4 are urgently *** we report the deposition of high quality Sr2IrO4 thin films on both insulating SrTiO3 and conducting SrTiO3:Nb substrates using pulsed laser deposition assisted with reflective high-energy electron *** optimal deposition temperature of Sr2IrO4 epitaxial films on SrTiO3:Nb substrates is about 90℃ lower than that on SrTiO3 *** electrical transports of high quality Sr2IrO4 films are measured, which follow the three-dimensional mott variable-range hopping *** film magnetizations are measured, which show weak ferromagnetism below ~240 K with a saturation magnetization of~ 0.2 μB/Ir at 5 *** study provides applicable methods to prepare high quality 5 d Sr2IrO4 epitaxial films, which could be extended to other Ruddlesden–Popper phases and potentially help the future study of exotic quantum phenomena in them.

关键词： substrates pulsed laser deposition iridates conduction mechanism