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Influence of polymer solution on the morphology and local structure of NH_(4)ZnPO_(4)powders synthesized by a simple precipitation method at room temperature

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 298-304页

作者： santi Phumying Thongsuk Sichumsaeng Pinit Kidkhunthod Narong Chanlek Jessada Khajonrit Somchai Sonsupap santi maensiri School of Physics Institute of ScienceSuranaree University of TechnologyNakhon Ratchasima 30000Thailand Synchrotron Light Research Institute(Public Organizer Nakhon Ratchasima 30000Thailand SUT-NANOTEC RNN on Nanomaterials and Advanced Characterizations Suranaree University of TechnologyNakhon Ratchasima 30000Thailand

NH_(4)Zn PO_(4)powders were synthesized using a simple precipitation method at room temperature.The effects of polyvinyl pyrrolidone(PVP),polyvinyl alcohol(PVA),glucose,and hexadecyltrimethylammonium bromide(CTAB)solutions on the morphology and structure of the prepared samples were investigated.The phase composition and morphology of the prepared samples were characterized using X-ray diffraction and scanning electron microscopy,respectively.Depending on the polymer sources,the hexagonal structure prepared using non-surfactant of water completely changed to monoclinic structure when CTAB was added.X-ray absorption near-edge structure(XANES)and X-ray photoelectron spectroscopy(XPS)were performed to study the local structure and surface electronic structure of the prepared samples,confirming that the oxidation states of P and Zn ions are^(5+)and^(2+),respectively.On the basis of the results of inductively coupled plasma atomic emission spectroscopy(ICP-OES),the NH_(4)Zn PO_(4)powders can be classified as a slow-release fertilizer where less than 15%of the ions were released in 24 h.A simple precipitation method using water,PVP,PVA,sucrose,and CTAB as a template can be used to synthesize NH4 Zn PO4 powders.In addition,this method may be extended for the preparation of other oxide materials.

关键词： ammonium zinc phosphate precipitation method morphology X-ray absorption spectroscopy ion release properties

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Synthesis, characterization and magnetic properties of KFeO_(2) nanoparticles prepared by a simple egg white solution route

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 128-135页

作者： Thongsuk Sichumsaeng Nutthakritta Phromviyo Supree Pinitsoontorn Pinit Kidkhunthod Narong Chanlek santi maensiri School of Physics Institute of ScienceSuranaree University of TechnologyNakhon Ratchasima30000Thailand SUT CoE on Advanced Functional Materials Suranaree University of TechnologyNakhon Ratchasima30000Thailand Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization Suranaree University of TechnologyNakhon Ratchasima30000Thailand Department of Physics Faculty of ScienceKhon Kaen UniversityKhon Kaen40002Thailand Synchrotron Light Research Institute(Public Organizer Nakhon Ratchasima30000Thailand

Nanoparticles of potassium ferrite(KFeO_(2))in this work were synthesized by a simple egg white solution method upon calcination in air at 773,873,and 973 K for 2 h.The effects of calcination temperature on the structural and magnetic properties of the synthesized KFeO_(2) nanoparticles were investigated.By varying the calcination temperature,X-ray diffraction and transmission electron microscopy results indicated the changes in crystallinity and morphology including particle size,respectively.Notably,the reduction in particle size of the synthesized KFeO_(2) was found to have a remarkable influence on the magnetic properties.At room temperature,the synthesized KFeO_(2) nanoparticles prepared at 873 K exhibited the highest saturation magnetization(M_(S))of 2.07×10^(4) A·m^(−1).In addition,the coercivity(H_(C))increased from 3.51 to 16.89 kA·m^(−1) as the calcination temperature increased to 973 K.The zero-field cooled(ZFC)results showed that the blocking temperatures(T_(B))of about 125 and 85 K were observed in the samples calcined at 773 and 873 K,respectively.Therefore,this work showed that the egg white solution method is simple,cost effective,and environmentally friendly for the preparation of KFeO_(2) nanoparticles.

关键词： egg white solution method potassium ferrite nanoparticles magnetic properties ferromagnetism

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Mangosteen peel-derived activated carbon for supercapacitors

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Progress in Natural Science:Materials International 2022年第5期32卷 570-578页

作者： Jessada Khajonrit Thongsuk Sichumsaeng Ornuma Kalawa Suphawi Chaisit Atchara Chinnakorn Narong Chanlek santi maensiri School of Physics Institute of Science Suranaree University of Technology SUT-NANOTEC RNN on Nanomaterials and Advanced Characterizations Suranaree University of Technology SUT Center of Excellence on Advanced Functional Materials Suranaree University of Technology Synchrotron Light Research Institute (Public Organization)

This work reports the effects of activation temperatures on the porous development and electrochemical performance of activated carbons. Herein, activated carbons were prepared from the biowaste of mangosteen peel by using KOH activation at temperatures of 400, 600, and 800°C. The results demonstrate that the specific surface area increases with increasing the activation temperatures in which the well-developed porous structure after KOH activation at 800°C provides the highest specific surface area of 1039 m2g-1. At 600°C, the activated carbon delivers the highest specific capacitance value of 182 F g-1at a current density of 0.5 A g-1in 3 M KOH aqueous electrolyte. This is correlated well with its high micropore fractions(99%). Moreover, it was found that the activation temperature changes the major contribution of oxygen-containing functional group on surface of activated carbon, which is beneficial for the enhancement of the specific capacitance value of activated carbon at the temperature of 600°C. This work suggests that the activation temperature is a key to optimizing the electrochemical performance of activated carbons. Overall, our activated carbons can be considered as a strong candidate for use as electrode materials in supercapacitors.

关键词： Mangosteen peel KOH activation Porous carbon Oxygen-containing functional group Supercapacitor

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Influence of gas-diffusion-layer current collector on electrochemical performance of Ni(OH)_(2) nanostructures

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1038-1047页

作者： Thongsuk Sichumsaeng Nutthakritta Phromviyo santi maensiri School of Physics Institute of ScienceSuranaree University of TechnologyNakhon Ratchasima30000Thailand SUT CoE on Advanced Functional Materials Suranaree University of TechnologyNakhon Ratchasima30000Thailand Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization Suranaree University of TechnologyNakhon Ratchasima30000Thailand

We report the electrochemical performance of Ni(OH)_(2) on a gas diffusion layer(GDL).The Ni(OH)_(2) working electrode was successfully prepared via a simple method,and its electrochemical performance in 1 M NaOH electrolyte was investigated.The electrochemical results showed that the Ni(OH)_(2)/GDL provided the maximum specific capacitance value(418.11 F·g^(−1))at 1 A·g^(−1).Furthermore,the Ni(OH)_(2) electrode delivered a high specific energy of 17.25 Wh·kg^(−1) at a specific power of 272.5 W·kg^(−1) and retained about 81%of the capacitance after 1000 cycles of galvanostatic charge–discharge(GCD)measurements.The results of scanning electron microscopy(SEM)coupled with energy-dispersive X-ray spectroscopy(EDS)revealed the occurrence of sodium deposition after long-time cycling,which caused the reduction in the specific capacitance.This study results suggest that the light-weight GDL,which can help overcome the problem of the oxide layer on metal–foam substrates,is a promising current collector to be used with Ni-based electroactive materials for energy storage applications.

关键词： hydrothermal synthesis nickel hydroxide gas diffusion layer sodium deposition electrochemical capacitor

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Structure and Magnetic Properties of Monodisperse Fe^(3+)-doped CeO_2 Nanospheres

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纳微快报：英文版 2013年第4期5卷 223-233页

作者： Sumalin Phokha Supree Pinitsoontorn santi maensiri Department of Physics Faculty of Science Khon Kaen University School of Physics Institute of Science Suranaree University of Technology

This work reports the study concerning the structure and magnetic properties of undoped CeO_2 and Fe-doped CeO_2(Ce_(1-x) Fe_xO_2, 0.01 ≤ x ≤ 0.07) nanospheres with diameters of 100~200 nm prepared by hydrothermal method using polyvinylpyrrolidone(PVP) as surfactant. The prepared samples were studied by using X-ray diffraction(XRD), Raman spectroscopy, transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM), X-ray absorption near-edge structure(XANES), and vibrating sample magnetometry(VSM). The XRD results showed that Fe-doped CeO_2 was single-phased with a cubic structure, and with Fe^(3+)successfully substituting in Ce^(4+) sites. Raman spectra showed a redshift of F_(2g) mode that caused by the Fe doping. The samples of both undoped CeO_2 and Fe-doped CeO_2 exhibited room temperature ferromagnetism, and the saturated magnetization(Ms) increased with increasing Fe content until x = 0.05, and then the samples displayed ferromagnetic loops as well as paramagnetic behavior. The roles of Ce^(3+) and Fe^(3+)spin electrons are discussed for the ferromagnetism in the Fe-doped CeO_2.

关键词： Cerium oxide Nanospheres Dilute magnetic oxide Ferromagnetism Oxygen vacancies XANES

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Comparative structural and electrochemical properties of mixed P2/O′3-layered sodium nickel manganese oxide prepared by sol-gel and electrospinning methods:Effect of Na-excess content

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矿物冶金与材料学报:英文版 2023年第10期30卷 1887-1896页

作者： Thongsuk Sichumsaeng Atchara Chinnakorn Ornuma Kalawa Jintara Padchasri Pinit Kidkhunthod santi maensiri School of Physics Institute of ScienceSuranaree University of TechnologyNakhon Ratchasima 30000Thailand SUT CoE on Advanced Functional Materials Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Synchrotron Light Research Institute(Public Organization) 111 University AvenueMuang DistrictNakhon Ratchasima 30000Thailand

The effect of Na-excess content in the precursor on the structural and electrochemical performances of sodium nickel manganese oxide(NNMO)prepared by sol-gel and electrospinning methods is investigated in this paper.X-ray diffraction results of the prepared NNMO without adding Na-excess content indicate sodium loss,while the mixed phase of P2/O′3-type layered NNMO presented after adding Na-excess content.Compared with the sol-gel method,the secondary phase of NiO is more suppressed by using the electrospinning method,which is further confirmed by field emission scanning electron microscope images.N_(2) adsorption-desorption isotherms show no remarkably difference in specific surface areas between different preparation methods and Na-excess contents.The analysis of X-ray absorption near edge structure indicates that the oxidation states of Ni and Mn are+2 and+4,respectively.For the electrochemical properties,superior electrochemical performance is observed in the NNMO electrode with a low Na-excess content of 5wt%.The highest specific capacitance is 36.07 F·g^(-1)at0.1 A·g^(-1)in the NNMO electrode prepared by using the sol-gel method.By contrast,the NNMO electrode prepared using the electrospinning method with decreased Na-excess content shows excellent cycling stability of 100%after charge-discharge measurements for 300 cycles.Therefore,controlling the Na excess in the precursor together with the preparation method is important for improving the electrochemical performance of Na-based electrode materials in supercapacitors.

关键词： sodium nickel manganese oxide mixed P2/O′3-type Na-excess content sol-gel method electrospinning method electrochemical properties

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Structure and effect of diamagnetism on manganese lithium phosphate glass to cathode materials application

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Progress in Natural Science:Materials International 2021年第3期31卷 420-427页

作者： Pichitchai Butnoi Wipada Senanon Narong Chanlek Yingyot Poo-arporn Supree Pinitsoontorn santi maensiri Prayoon Songsiriritthigul Pongtanawat Khemthong Pinit Kidkhunthod Synchrotron Light Research Institute (Public Organization) Insitute of Nanomaterials Research and Innovation for Energy (IN-RIE) Khon Kaen University Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization School of Physics Institute of Science Suranaree University of Technology School of Physics Institute of Science Suranaree University of Technology Center of Excellent on Advanced Functional Materials Suranaree University of Technology National Nanotechnology Center National Science and Technology Development Agency

1-x(Li2O-2 P2O5)-xMnO2glasses where x=0.2,0.3 and 0.4 mol%,respectively,were synthesized by meltedquenching method.The Mn and P oxidation states and local structures around Mn and P-ions including Mn-O and P-O bonding distances and coordination numbers have been studied via X-ray absorption near edge structure(XANES) and extended X-ray absorption fine structure(EXAFS),respectively.XANES results exhibit a coexistence of oxidation state of Mn2+and Mn3+with a mean value of 2.82.Moreover,Mn and P K-edge EXAFS show the Mn-O and P-O bonding distances of approximately 2.083-2.094 A and 1.766-1.774 A,respectively.A paramagnetism was found for all Mn-P glasses.Additionally,the coercive field(Hc) and remnant magnetization(Mr)increased with increasing Mn contents.However,the low specific capacitances are seriously obtained(<40 F g-1)suggesting the effect of natural diamagnetism of lithium phosphate based-glass unlike the borate based-glasses which originally exhibit paramagnetism.

关键词： XAS XANES EXAFS Manganese lithium phosphate glass Diamagnetism

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CoFe_2O_4-BaTiO_3颗粒复合材料的频率相关电磁性能(英文)

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Transactions of Nonferrous Metals Society of China 2011年第11期21卷 2438-2442页

作者： Atchara KHAMKONGKAEO Pongsakorn JANTARATANA Chitnarong SIRISATHITKUL Teerapon YAMWONG santi maensiri Department of Physics Faculty of ScienceKhon Kaen University Department of Physics Faculty of ScienceKasetsart University Magnet Laboratory School of ScienceWalailak University National Metals and Materials Technology Center(MTEC) Thailand Science Park School of Physics Institute of ScienceSuranaree University of Technology

通过湿法球磨制备CoFe2O4-BaTiO3颗粒复合材料,研究材料成分和调制频率与电磁效应的关系。结果表明:电磁效应系数随着调制频率由400Hz增加到1000Hz而增加。由于CoFe2O4的电导率在400-1000Hz范围内对频率敏感,电磁效应的曲线特性而发生... 详细信息

通过湿法球磨制备CoFe2O4-BaTiO3颗粒复合材料,研究材料成分和调制频率与电磁效应的关系。结果表明:电磁效应系数随着调制频率由400Hz增加到1000Hz而增加。由于CoFe2O4的电导率在400-1000Hz范围内对频率敏感,电磁效应的曲线特性而发生改变。在烧结过程中形成第三相Ba2Fe2O5,从而导致电磁效应的下降。

关键词：铁氧体铁电体 CoFe2O4-BaTiO3 磁电效应调制频率

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