CHEMISTRY OF MATERIALS
·
2015
·
IF 8.354
Chuanjian Zhang,Zhou Lin,Zhenzhong Yang,Dongdong Xiao,Pu Hu,Hongxia Xu,Yulong Duan,Shuping Pang,Lin Gu,Guanglei Cui
Germanium has been investigated intensively for its high specific capacity and tough nature, which make it a promising candidate anode for high energy lithium-ion batteries. However, the rational design of a germanium electrode with enhanced electrochemical performances is still a big challenge. Herein, we designed and synthesized germanium microcubes with a hierarchical structure directly on titanium foil via a simple hydrogen reduction method. An ultrahigh initial Coulombic efficiency of 91.8% was acquired due to the high crystallinity of germanium for reversible lithium insertion and extraction, less adverse side reaction for irreversible lithium loss, and unique hierarchical structure for easier electrolyte penetration. In addition, the Li2CO3-predominated solid electrolyte interface contributes significantly to the excellent cycling and rate performances of the anode. Both half and full cell performances demonstrate that germanium has potential applications in high-performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2016
·Vol. 6
·期 11
·3574-3585
·
IF 2.657
X. Y. Liu,H. Guo,S. X. Dai,M. Y. Peng,Q. Y. Zhang
In this paper, novel Bi3+/Eu3+ co-doped white-emitting germanium-borate glasses were successfully prepared by the melt-quenching method. Their luminescent properties were evaluated using the transmission spectra, photoluminescence excitation, and emission spectra (with a temperature range of 298-573 K), and lifetime decay curves. Due to the efficient energy transfer from Bi3+ to Eu3+, tunable emitting color between the bluish-green and the orange-red region has been obtained by varying the content of Eu3+ (0-7%). Interestingly, a perfect white-light emission with CIE coordinates (X = 0.356, Y = 0.325) is realized upon the excitation at 345 nm light in the Bi3+/Eu3+ co-doped sample. More remarkably, the white-light emission glass maintains excellent color stability even at 423 K. Our results indicate that the Bi3+/Eu3+ co-doped germanium-borate glasses may be used as a potential single-phased white light-emitting matrix material for the UV converted organic-resin-free WLEDs in the future.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Chuan Tang,Mingjun Xia,Rukang Li
A noncentrosymmetric salt-inclusion germanate, Rb10Li3Sc4Ge12O36F, was grown through spontaneous crystallization from a LiF–RbF flux. It crystallizes in the polar space group P31c with cell parameters of a = 10.7587(3) Å, c = 21.6691(10) Å, and Z = 2. Its structure features a complex 3D framework composed of helical [Ge4O12] chains from condensed [GeO4] tetrahedra running along the c axis, which are interconnected by the [ScO6] octahedra. Voids of the 3D net are filled with Rb+ ions, Li+ ions, and isolated trigonal-bipyramidal [Rb3Li2F] superalkali clusters. The title compound has a large band gap of 5.6 eV, a moderate powder second-harmonic-generation response of 0.9KDP, and an extremely small birefringence of 0.001, as was further unraveled by theoretical calculations.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Nano
·
2022
·
IF 13.364
L. Han,Z. Chen,Q. Wei,J. Tang,M. Wei
A new nanocomposite of GeO 2 /nitrogen-doped carbon (GeO 2 /NC) with abundance oxygen vacancies has been synthesized based on a reaction induced by a cationic surfactant and not only exhibits a superb rate performance and favorable cycling stability but also displays an ultrahigh reversible capacity when served as an anode for lithium ion batteries . Such an excellent performance can be associated with the highly enhanced kinetics in conversion reaction, which is derived from the synergistic effects among the unique N-doped carbon layer, GeO 2 nanoparticles , and oxygen vacancies. Driven by the overwhelming advantages, the GeO 2 /NC nanocomposite delivers a large capacity of 1044.6 mA h/g at 1.0 A/g even after 1200 cycles with negligible capacity attenuation and superb reversibility, in which a Coulombic efficiency is over 99.6%. Furthermore, the electrochemical reaction mechanism is also revealed by the in situ X-ray diffraction and ex situ X-ray photoelectron spectroscopy, and confirming that the conversion reaction is highly reversible even after 1200 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
ZhuoXing Wen,LianJie Li,WenJun Huang,SunYueZi Chen,Lei Lei,Tao Pang,Hai Guo
Here, we successfully prepared Tb 3+ -activated borogermanate glass by the traditional melt-quenching method. The optical and scintillating properties were investigated by using photoluminescence , transmission spectra, luminescence decay curves and X-ray excited luminescence. High content of Gd 2 O 3 was added into borogermanate glass to improve the density of glass (about 5.52 g/cm 3 ), and thus to enhance the radiation stopping power. Al powder was introduced into the composition as reducing agent. Due to incorporation of Al powder, the internal quantum efficiency of glass increases from 18.8% to 56.3%. Meanwhile, the integrated intensity of X-ray excited luminescence of glass promotes from 29.8% to 46.6% compared to Bi 4 Ge 3 O 12 scintillating crystal. All above results declare that Al powder as reducing agent can strengthen the optical and scintillating properties of Tb 3+ -activated borogermanate glass.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Rui Chen,Chang Liu,Yangyang Chen,Chao Ye,Shi Chen,Jinrong Cheng,Shixun Cao,Shenghao Wang,Anyang Cui,Zhigao Hu,He Lin,Jinlong Wu,Xiang Yang Kong,Wei Ren
All-inorganic perovskite halide semiconductors have been noticed for applications in photovoltaics, light-emitting diodes, lasers, and photodetectors, thanks to their exceptional optoelectronic characteristics. As a typical example, CsGeI3 was previously investigated in the forms of quantum dots and thin films. Here, we developed a technique based on aqueous solution to synthesize millimeter-level-sized CsGeI3 single crystals. The ferroelectric and photoelectric functionalities of the as-grown crystals were examined and compared with the prediction from density functional theory calculation. These findings not only provide a new route to make germanium-based perovskite single crystals but also introduce possible prospects for ferroelectric photovoltaics.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yuda Lin,Kehua Zhong,Junqing Zheng,Mingxing Liang,Guigui Xu,Qian Feng,Jiaxin Li,Zhigao Huang
Rational engineering of nanostructured anode materials is important to develop lithium-ion batteries (LIBs). In this study, hierarchical composites of fluoridated carbonaceous GeO2 (F-GeO2@C) with rich oxygen vacancies were prepared by a simple annealing method. It is found that F– ions not only exist in the carbon matrix but also replace O2– of metallic oxides. The abundant introduced oxygen vacancies can provide more active sites and contribute to better electronic conductivity. Moreover, density functional theory (DFT) calculations confirm that F-doping greatly changes the electronic structure of the GeO2 composite, exhibiting interesting metallic behavior. Consequently, the F-GeO2@C anode shows an enhanced initial Coulombic efficiency (ICE) value of 71.6% and delivers excellent rate capability, much higher than most reported GeO2-based anodes. The enhancement of the electrochemical performance for F-GeO2@C is attributed to the hierarchical nanostructure and F-doping by increased reaction kinetics, reversibility, and cycling stability. Thus, such rational fabrication of the composite can motivate other high-performance germanium-based materials in LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Functional Biomaterials
·
2023
·Vol. 14
·期 3
·154
·
IF 4.8
Yingqi Ji,Shun Yang,Jian Sun,Congqin Ning
The treatment of infective or potentially infectious bone defects is a critical problem in the orthopedic clinic. Since bacterial activity and cytocompatibility are always contrary factors, it is hard to have them both in one material. The development of bioactive materials with a good bacterial character and without sacrificing biocompatibility and osteogenic activity, is an interesting and valuable research topic. In the present work, the antimicrobial characteristic of germanium, GeO2was used to enhance the antibacterial properties of silicocarnotite (Ca5(PO4)2SiO4, CPS). In addition, its cytocompatibility was also investigated. The results demonstrated that Ge–CPS can effectively inhibit the proliferation of bothEscherichia coli(E. coli) andStaphylococcus aureus(S. aureus), and it showed no cytotoxicity to rat bone marrow-derived mesenchymal stem cells (rBMSCs). In addition, as the bioceramic degraded, a sustainable release of germanium could be achieved, ensuring long-term antibacterial activity. The results indicated that Ge–CPS has excellent antibacterial activity compared with pure CPS, while no obvious cytotoxicity was observed, which could make it a promising candidate for the bone repair of infected bone defects.Keywords:implant material;silicocarnotite;germanium dioxide;antibacterial activity;cytocompatibility
研究领域:
生物医学工程
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材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 9
·2681-2689
·
IF 6.1
Jiazheng Zhou,Hongshan Wang,Junjie Liu,Xin Su,Yu Chu,Jiale Qu,Xiangzhan Jiang
Two new thiohalides Pb3GeS4Br2 and Pb3.5GeS4Br3 have been synthesized by introducing Pb2+ into the thiogermanate system. The compounds crystallize in centrosymmetric P21/c (Pb3GeS4Br2) and non-centrosymmetric P63 (Pb3.5GeS4Br3) space groups, respectively. To the best of our knowledge, Pb3GeS4Br2 and Pb3.5GeS4Br3 are the first Pb-containing thiogermanate halides, and the latter is the first phase-matching IR nonlinear optical material in the thiogermanate halide system. Due to the presence of Pb2+ with stereochemically active lone pair electrons, Pb3GeS4Br2 exhibits a strong optical anisotropy with a birefringence of 0.131@1064 nm, while Pb3.5GeS4Br3 shows a large second-harmonic generation response (0.8 × AgGaS2) and high laser-induced damage threshold (3.0 × AgGaS2). These results enrich the structural and chemical diversity of chalcohalides.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 77
·期 3
·666-674
·
IF 1.532
Cui Wei,Wang Shixing,Peng Jinhui,Zhang Libo,Zhang Gengwei
Abstract We prepared the catechol-functionalized nanosilica for adsorption of germanium (Ge) ions from aqueous media. The functionalized nanosilica was characterized by FTIR, TGA, TEM, BET, and XPS. The influence of pH, Ge initial concentration, and time of the adsorption process was investigated. Under the optimum condition, the maximum adsorption capacity of Ge ions was 0.048 mg m −2 at pH 4.5. The adsorption mechanism is the chelating interaction between hydroxyl and Ge(OH) 4 . The functionalized nanosilica was able to selectively adsorb Ge ions from tellurium(IV) and boron. Langmuir isotherm was found to better fit the experiment data rather than Freundlich isotherm. The kinetics of the adsorption process of Ge ions on the functionalized nanosilica was investigated using the pseudo-first-order and pseudo-second-order models, and the results indicated that the pseudo-second order equation model provided the best correlation with the experimental results. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Haozhe Qin,Bao Zhang,Chunhui Wang,Lei Ming,Xing Ou
Phase engineering for synchronously realizing the demand of electrochemical reactions and structural stability has attracted the great enthusiasm of researchers to obtain high capacity and tolerance for Na+ insertion, especially the construction of uniform heterostructures by regulating the crystal structure in the same phase. Herein, ultrathin GeS2 nanoflakes composed of a mixture of orthorhombic and monoclinic crystal structures have been constructed by employing an in situ Ge-MOF sulfidation method. Benefiting from the combined effect of the accelerated reaction kinetics derived from the self-assembly of heterostructures, and the enhanced reaction reversibility originating from the excellent homogeneity of heterointerfaces and a stable intermediate phase interface, the GS-OM electrode materials show outstanding rate properties (371.9 mA h g–1 at 30 A g–1) and Na+ uptake/removal durability (603.9 mA h g–1 at 10 A g–1 over 1000 cycles) and even deliver an excellent practicability (104.01 mA h g–1 at 1 A g–1 over 300 cycles for full cells). Of note, this constructed phase engineering is expected to provide powerful guidance and effective insight for designing better sodium ion battery anodes with not only superior electrochemical reaction reversibility but also improved structure perdurability.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hanjun Wu,Yang Zhang,Zhenyue Zhang,Wenda Guo,Wendou Chen,Guoqing Feng,Junxia Yu,Ruan Chi,Zhiquan Pan
In this work, a germanium ion-imprinted polymer (Ge-IIP) based on α-bromobutyric intercalation-modified hydrotalcite was synthesized by atom transfer radical polymerization and applied for the capture of germanium ions from wastewater. In particular, layered hydrotalcite as a skeleton support induced in situ polymerization of Ge-IIPs to form graded pores, and an α-bromobutyric interlayer was also used as an initiator to induce graft polymerization of functional monomers of 3-dihydroxypropyl-2-acrylate to form strong coordination cavities for germanium ions. Batch experiment results showed that Ge-IIPs could effectively capture germanium at a pH value of 3, and the maximum adsorption capacity was up to 55.18 mg·g–1. The adsorption kinetics and isotherms indicated that the capture of germanium was consistent with a pseudo-second-order kinetic model and a Freundlich isotherm model. The distribution coefficient values of Ge(IV) adsorption by Ge-IIPs in a coexisting metal ion solution were as high as 25 231.36 mL·g–1, indicating significant capture selectivity. In addition, Ge-IIPs showed good reusability, and the uptake rate of germanium could still reach 98.45% after 5 cycles. Furthermore, density functional theory calculation indicated that the efficient selective capture of germanium by Ge-IIPs may be attributed to the ion exchange and surface complexation between germanium ions and the abundance of o-hydroxyl groups in the Ge-IIP structure. The excellent salt tolerance and adsorption selectivity of Ge-IIPs provide the possibility for its practical application in germanium recovery from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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