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Green and low temperature synthesis of nanocrystalline transition metal ferrites by simple wet chemistry routes

Nano Research 2014年第7期7卷 1027-1042页

作者： Stefano Diodati Luciano Pandolfo Andrea Caneschi Stefano Gialanella Silvia Gross Istituto per I'Energetica e le In terfasi IENI-CNR and INSTM UdR di Padova via Marzolo 11-35131 Padova Italy Dipartimento di Scienze Chimiche Universit& degli Studi di Padova via Marzolo 11-35131 Padova Italy Laboratory of Molecular Magnetism LAMM Dipartimento di Chimica e UdR INSTM di Firenze Polo Scientifico Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy Dipartimen to di Ingegneria Industriale Universita degli Studi di Tren to via Mesiano 771-38123 Trento Italy

Crystalline and nanostructured cobalt （CoFe2O4）, nickel （NiFe2O4）, zinc （ZnFe2O4） and manganese （MnFe2O4） spinel ferrites are synthesized with high yields, crystallinity and purity through an easy, quick, reproducible and low-temperature hydrothermal assisted route starting from an aqueous suspension of copredpitated metal oxalates. The use of water as a reaction medium is a further advantage of the chosen protocol. Additionally, the zinc spinel is also prepared through an alternative route combining copredpitation of oxalates from an aqueous solution with thermal decomposition under reflux conditions. The nanocrystalline powders are obtained as a pure crystalline phase already at the extremely low tem- perature of 75 ℃ and no further thermal treatment is needed. The structure and microstructure of the prepared materials is investigated by means of X-ray powder diffraction （XRPD）, while X-ray photoelectron spectroscopy （XPS） and inductively coupled plasma-atomic emission spectroscopy （ICP-AES） analyses are used to gain information about the surface and bulk composition of the samples, respectively, confirming the expected stoichiometry. To investigate the effect of the synthesis protocol on the morphology of the obtained ferrites, transmission electron microscopy （TEM） observations are performed on selected samples. The magnetic properties of the cobalt and manganese spinels are also investigated using a superconducting quantum device magnetometer （SQUID） revealing hard and soft ferrimagnetic behavior, respectively.

关键词： ferrites hydrothermal low temperature wet chemistry green

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Depth profiling of arsenian pyrite in Carlin-type ores through wet chemistry

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Acta Geochimica 2023年第2期42卷 256-265页

作者： Meizhi Yang Quan Wan Xin Nie Suxing Luo Yuhong Fu Ping Zeng Wenqi Luo State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Comparative Planetology Hefei 230026China Department of chemistry and Chemical Engineering Zunyi Normal CollegeZunyi 563006China School of Geographic and Environmental Sciences Guizhou Normal UniversityGuiyang 550001China

Enrichment of As and Au at the overgrowth rims of arsenian pyrite is a distinctive feature of Carlin-type gold *** distribution of such key elements in high resolution is of fundamental importance yet often proves *** this study,repeated non-oxidative acid etching of ore samples from Shuiyindong gold deposit was applied to enable elemental depth profiling of goldbearing arsenian pyrite ***-OES and AAS were used to determine the dissolved Fe,As,and Au concentrations in each of the etching solutions,and XPS was carried out to exam the etched mineral *** contrast to conventional ion beam etching that may cause substantial sample damage,our acid etching method does not seem to significantly alter the composition and chemical state of the *** etched depths directly converted from the measured elemental concentrations can reproducibly reach a very high resolution of~1 nm,and can be conveniently controlled through varying the etching *** the Fe and As depth profiles consistently reflect the surface oxidation property of arsenian pyrite,the Au profile displaying an obvious upward trend reveals the ore fluid evolution at the late stage of *** on our experimental results,we demonstrate that our wet chemistry method is capable of effective depth profiling of gold ore and perhaps other geological samples,with advantages surpassing many instrumental techniques including negligible sample damage,nanoscale resolution as well as isotropic etching.

关键词： wet chemistry Acid etching Depth profiling Carlin-type gold deposits Arsenian pyrite

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Outstanding long-cycling lithium−sulfur batteries by core-shell structure of S@Pt composite with ultrahigh sulfur content

Advanced Powder Materials

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Advanced Powder Materials 2022年第1期1卷 88-96页

作者： Mengqin Gao Wan-Ying Zhou Yu-Xue Mo Tian Sheng Yanhong Deng Liezun Chen Kai Wang Yanliang Tan Haiqing Zhou College of Physics and Electronic Engineering Hengyang Normal UniversityHenghua Road No.16Hengyang City421002Hunan ProvinceChina College of chemistry and Materials Science Anhui Normal UniversityWuhu241000China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha410081China Institute of Nanotechnology Karlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany

Here we proposed a novel approach to greatly enhance the electrochemical performance of Li-S batteries by designing a composite electrode material composed of a core-shell structure of S@Pt composite(sulfur content,85%)grown on the S *** platinum(Pt)nanosheets provide physical barrier and strong chemical binding to anchor LiPSs and improve the electronic conductivity of ***,by introducing carbon nanofibers(CNFs)as the interlayer,we achieved outstanding Li-S battery with a high initial discharge capacity of 1040 mAh g^(-1)at 1.0C and a reversible capacity of 742 mAh g^(-1)after 350 cycles,demonstrating its excellent long-term cycling stability with a low capacity decay rate of 0.08%per *** to the density functional theory(DFT)calculations,we proposed that the superior performance is attributed to the cooperative effects of the strong interfacial interaction between Pt(111)surface and the S8 molecule,and very low reaction energy of decomposition,−6.4eV.

关键词： Lithium-sulfur batteries wet chemistry High sulfur content Pt nanoshell Carbon fibers layer

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Facile filling of metal particles in small carbon nanotubes for catalysis

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Journal of Energy chemistry 2013年第2期22卷 251-256页

作者： Hongbo Zhang Xiulian Pan Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

A versatile wet chemistry method is developed for filling of subnanometer sized metal particles in carbon nanotubes with a diameter smaller than 1.5 nm. As an example, we showed that a confined bi-component Pd-V catal... 详细信息

关键词： double-walled carbon nanotubes (DWCNTs) single-walled carbon nanotubes (SWCNTs) nanoparticles wet chemistry benzene hydroxyla-tion

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