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| 1 | 一种新型廉价、环境友好、结构稳定且具有大离子通道的钾离子电池正极材料显示文摘得益于钾的地壳丰度及其与锂的化学相似性,钾离子电池有望应用于大规模储能领域.目前,钾离子电池的性能尚不能满足实用需求,主要原因在于缺乏合适的正极材料.基于硫酸根的强诱导效应和草酸体系制备亚铁化合物的优势,本文制备了一种新型廉价、环境友好且稳定的储钾正极材料K_(4)Fe_(3)(C_(2)O_(4))_(3)(SO_(4))_(2).其独特的二维层状晶体结构具有3.379Å的层间距,且层内具有4.576×6.846Å的大环.根据第一性原理计算,该结构有利于钾离子的可逆迁移,且体积变化仅为6.4%.不同充放电态样品的同步辐射X射线吸收光谱和XRD、半电池以及全电池的电化学表征证实了其优异的电化学可逆性和结构稳定性.通过成分调控、掺杂、结构优化等策略,K_(4)Fe_(3)(C_(2)O_(4))_(3)(SO_(4))_(2)正极材料的电化学性能有望进一步提升.因此,本工作为廉价、环保的储钾正极材料提供了一种新的稳定晶体模型. | 王伟科 季必发 姚文娇 张馨元 郑勇平 周小龙 Pinit Kidkhunthod 何海燕 唐永炳 | 2021 | Science China Materials2021，64，5： | 3 |
| 2 | Molecular grafting towards high-fraction active nanodots implanted in N-doped carbon for sodium dual-ion batteries显示文摘Sodium-based dual-ion batteries(Na-DIBs) show a promising potential for large-scale energy storage applications due to the merits of environmental friendliness and low cost.However,Na-DIBs are generally subject to poor rate capability and cycling stability for the lack of suitable anodes to accommodate large Na+ ions.Herein,we propose a molecular grafting strategy to in situ synthesize tin pyrophosphate nanodots implanted in N-doped carbon matrix(SnP_(2)O_(7)@N-C),which exhibits a high fraction of active SnP_(2)O_(7) up to 95.6 wt% and a low content of N-doped carbon(4.4 wt%) as the conductive framework.As a result,this anode delivers a high specific capacity400 mAh g^(-1) at 0.1 A g^(-1),excellent rate capability up to 5.0 A g^(-1) and excellent cycling stability with a capacity retention of 92% after 1200 cycles under a current density of1.5 A g^(-1).Further,pairing this anode with an environmentally friendly KS6 graphite cathode yields a SnP_(2)O_(7)@N-C||KS6 Na-DIB,exhibiting an excellent rate capability up to 30 C,good fast-charge/slow-discharge performance and long-term cycling life with a capacity retention of96% after 1000 cycles at 20 C.This study provides a feasible strategy to develop high-performance anodes with high-fraction active materials for Na-based energy storage applications. | Sainan Mu Qirong Liu Pinit Kidkhunthod Xiaolong Zhou Wenlou Wang Yongbing Tang | 2021 | National Science Review2021，8，7： | 1 |
| 3 | 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显示文摘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. | Santi Phumying Thongsuk Sichumsaeng Pinit Kidkhunthod Narong Chanlek Jessada Khajonrit Somchai Sonsupap Santi Maensiri | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，2： | 0 |
| 4 | Synthesis, characterization and magnetic properties of KFeO_(2) nanoparticles prepared by a simple egg white solution route显示文摘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. | Thongsuk Sichumsaeng Nutthakritta Phromviyo Supree Pinitsoontorn Pinit Kidkhunthod Narong Chanlek Santi Maensiri | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，1： | 0 |
| 5 | Structure and effect of diamagnetism on manganese lithium phosphate glass to cathode materials application显示文摘1-x(Li_(2)O-2 P_(2)O_(5))-xMnO_(2)glasses 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 Mn^(3+)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. | Pichitchai Butnoi Wipada Senanon Narong Chanlek Yingyot Poo-arporna Supree Pinitsoontorn Santi Maensiri Prayoon Songsiriritthigul Pongtanawat Khemthong Pinit Kidkhunthod | 2021 | Progress in Natural Science:Materials International2021，31，3： | 0 |
| 6 | 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显示文摘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. | Thongsuk Sichumsaeng Atchara Chinnakorn Ornuma Kalawa Jintara Padchasri Pinit Kidkhunthod Santi Maensiri | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，10： | 0 |
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