INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 43
·期 28
·12646-12652
·
IF 4.229
Le Zhao,Jingran Xiao,Huali Huang,Qiuyang Huang,Yicheng Zhao,Yongdan Li
Ge doped α-Fe 2 O 3 nanowires are synthesized through a hydrothermal procedure with GeO 2 as a precursor and investigated as photoanodes for water splitting. The content of Ge in the photoanode rises with the increase of the amount of GeO 2 in the precursor solution . A proper amount of Ge facilities the preferred oriented growth of the (110) plane of α-Fe 2 O 3 , while excessive Ge hinders the growth of α-Fe 2 O 3 crystals. The doping of Ge increases the absorption efficiency and decreases the recombining rate of the photogenerated electrons and holes. Ge also improves the density and transfer rate of the charge carriers in the photoanode. Ge doped α-Fe 2 O 3 photoanode exhibits a highest photocurrent density of 0.92 mA cm −2 at 1.23 V vs. reversible hydrogen electrode under AM 1.5 G simulated sunlight, which is nearly twice of that obtained by pure α-Fe 2 O 3 under the same condition.
研究领域:
材料科学
·
可再生能源
·
光催化
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Eryang Mao,Lin Fu,Weiwei Liu,Xianhui Gao,Jing Liu,Renming Zhan
The traditional graphite anode with a specific capacity of 372 mA h g −1 for lithium-ion batteries (LIBs) can’t satisfy the increasing demands of energy density . Germanium (Ge) anode material has been considered as a promising candidate owning to its higher theoretical specific capacity (∼1600 mA h g −1 ). Unfortunately, lithiation/delithiation process of Ge produces a huge volume variation, resulting in poor electrochemical performances. Herein, we designed and prepared a unique Ge-based composite that immersing hetero-Cu 3 Ge/Cu into a nitrogen-doped carbon matrix (CG/G@NC). In this delicate architecture, both NC and electrochemically inert Cu 3 Ge act as conductive additives and volume buffers to improve conductivity and mitigate volume changes, respectively. Also, heterostructure possesses good charge transfer kinetics and offers an additional Li + diffusion path. As result, the Li + diffusion in CG/G@NC composite is ∼930 times as fast as commercial Ge and ∼320 times as fast as NC. As expected, the as-prepared CG/G@NC composite exhibits superior outstanding cycle stability (455 mA h g −1 after 500 cycles at a constant current density 1000 mA g −1 ) and exceptional rate capability. Meaningfully, encapsulating Ge-based heterostructure materials with functional components into the carbon matrix is a promising method to facilitate the practical application of Ge-based anode materials.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
PHILOSOPHICAL MAGAZINE
·
2015
·
IF 1.825
Yufeng Li,Jianzhong Liu,Wenhao Liu,Xiyu Zhu,Hai-Hu Wen
We have successfully synthesized and investigated the compound with a space group. By chemical doping, we substituted gallium element with germanium element in the system. The solubility limit of germanium element is about = 0.25 in . The lattice parameter of -axis becomes larger, while -axis becomes smaller with doping germanium. In CrGaN, there is a phase transition at 170 K as revealed by both resistivity and magnetic susceptibility measurements at ambient pressure, this transition could correspond to a possible spin-density wave ordering transition. The electrical transport and magnetic behaviours show very similar properties to that of the parent compounds of iron-based superconductors. By doping germanium to the system, the possible SDW transition was successfully suppressed. While with the application of a hydrostatic pressure up to 1.1 GPa, the transition temperature does not show a clear change. No superconductivity was observed in either Ge-doped sample or under a hydrostatic pressure.
研究领域:
凝聚态物理
·
材料科学
·
强关联电子系统
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 13
·10183-10193
·
IF 2.779
Zhang Liangbin,Mei Hongrong,Rao Zhenggang,Shu Longlong,Li Chunchun
In this work, a strategy was demonstrated to reduce the sintering temperature of Mg 2 SiO 4 ceramics while keeping the macrostructure unchanged, through an appropriate amount of low melting point Ge substitution for B-site Si. A series of Mg 2 Si 1 − x Ge x O 4 ( x = 0.1–0.4) ceramics were prepared by a solid-state reaction method. Influences of Ge substitution on the sintering behavior, crystal structure, and microwave dielectric properties were studied. By comparison, the Ge-substituted samples could be effectively sintered at relatively lower sintering temperatures (~ 1370 °C), which is more than 100 °C lower than the nominal Mg 2 SiO 4 . In addition, the optimum microwave dielectric performance was achieved in the sample with x = 0.4, with the relative density ~ 97%, the relative dielectric constant ( ε r ) of 7.2, the quality factor ( Q × f ) of 75,794 GHz, and the temperature coefficient of the resonance frequency ( τ f ) of − 41.2 ppm/°C. This compositional regulation provides a paradigm for improving the sintering characteristics of silicate.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
Aggregate
·
2025
·
IF 13.7
Zhu Guo,Dingchong Han,Xian-Jiang Song,Hui-Peng Lv,Zeyu Deng,Chao Wang,Guangtong Yuan,Yuxin Liu,Jiangyu Li,Min Luo,Wei-Xiong Zhang,Han-Yue Zhang,Lingling Mao
Confinement effect, by strengthening interactions between structural components, provides an effective strategy for precisely regulating functional units, which is critical for properties associated with microscopic accumulation effects, such as second harmonic generation (SHG) and ferroelectricity. Here, we propose a molecular dipole management strategy through confinement effect to enhance the SHG and ferroelectricity properties in a new hybrid germanium perovskite system. Utilizing the cyclohexylammonium (Cy) cation, we successfully synthesize three polar phases, including one-dimensional (1D) hexagonal (Cy)GeI 3 , a step-like two-dimensional (2D) (Cy) 4 Ge 3 I 10 phase, and a 2D (CyF) 2 GeI 4 phase (CyF = 4,4-difluorocyclohexanammonium). All three phases exhibit photoresponses, characteristic of semiconductors. The metastable 1D (Cy)GeI 3 phase has the highest local dipole moment (LDM) of 14.07 Debye along the c -axis, resulting in a strong SHG response, and a high octahedral distortion parameter ( D i = 0.10). The step-like 2D (Cy) 4 Ge 3 I 10 phase exhibits ferroelectric properties, where the remanent polarization of 0.34 µC/cm 2 has been confirmed by PFM and P-E hysteresis loop measurements. To achieve both high phase stability and SHG intensity, we introduce a fluorine group into the organic cation, forming strong C─H···F─C hydrogen bonds that align polar units uniformly, increasing D i to 0.11. The 2D (CyF) 2 GeI 4 phase achieves a high SHG of 4 × KH 2 PO 4 . Furthermore, its phase transition temperature also increases by 88 K compared to the (Cy) 4 Ge 3 I 10 phase. Raman spectra and DFT calculations further reveal intensified confinement effect in the (CyF) 2 GeI 4 phases, consistent with its stronger structural rigidity. Our work provides comprehensive perspective and design strategies for tuning and optimizing hybrid perovskite-based nonlinear optical materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Zong-Dong Sun,Yang Chi,Sheng-Ping Guo
Three europium chalcogenides , Cu 2 EuSiS 4 ( 1 ), Cu 2 EuGeS 4 ( 2 ), and Cu 2 EuGeSe 4 ( 3 ) were obtained by a high-temperature solid-state method. They crystallize in the noncentrosymmetric space groups P 3 1 21 ( 1 ), P 3 2 21 ( 2 ), and Ama 2 ( 3 ), respectively. Their structures can be described as EuQ 8 bicapped trigonal prisms ( btp s) constructed 3 D frameworks, and Cu and Si/Ge atoms occupying the tetrahedral cavities. The 3 D network built by CuQ 4 and Si/GeQ. 4 tetrahedra in 3 is different from that in 1 and 2 . Their energy band gaps are determined to 2.36, 2.32, and 1.74 eV for 1 – 3 , respectively. Compound 1 shows typical photoluminescence of Eu 2+ ion. All of them show antiferromagnetic-like behaviors, and are not second-harmonic generation-active. Theoretical calculations indicate that 1 and 2 show direct band gaps, while 3 indirect.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2020
·Vol. 63
·期 9
·1769-1778
·
IF 6.098
Xu Jingjing,Wu Hongping,Yu Hongwei,Hu Zhanggui,Wang Jiyang,Wu Yicheng
Alike phosphates, silicates and germanates exclusively containing tetrahedral basic building units (BBUs) can also exhibit ultraviolet (UV) even deep-UV transitions. They are important for the design of new UV or deep-UV nonlinear optical (NLO) materials. In this paper, four new alkali metal silicates and germanates, Li 2 Rb 4 Si 6 O 15 , Li 2 Cs 4 Si 6 O 15 , Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 were successfully synthesized by a high temperature solid state reaction. They obey the general formula of Li m A n M 6 O 15 (A=Rb, Cs; M=Si, Ge; m+n =6) and all exhibit the Sr 2 Be 2 B 2 O 7 (SBBO)-like structures. More importantly, Li 3 Rb 3 Ge 6 O 15 and Li 3 Cs 3 Ge 6 O 15 crystallize in the noncentrosymmetric (NCS) structures and exhibit remarkable phase-matched second harmonic generation (SHG) effect, 0.8×KH 2 PO 4 (KDP) and 1×KDP, respectively. These indicate that they are potential as UV or deep-UV NLO materials. Furthermore, their optical and NLO properties as well as thermal properties were measured. The structure-property relationships were studied by the dipole moment calculations and the first-principles calculations.
研究领域:
材料科学
·
无机化学
·
光学材料
·
固态化学
·
非线性光学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2026
·
IF 3.9
Ziqiang Zhang,Mengen Li,Lei Peng,Fang Li,Zhanfei Zhang
Wound healing is a complex process that requires the coordinated action of various cell lineages, among which fibroblasts play an important role at all stages of wound healing. Due to its gentle nature and precise controllability, electrical stimulation has also attracted attention in the wound healing process. To this end, we constructed a carbon nanotube (CNT)-based conductive dressing—polylactic acid/gelatin/CNT (PLA/GE/CNT)—using electrospinning technology. This material has good biocompatibility, and its fibers are characterized by aligned orientation. When combined with external electrical stimulation, it effectively promotes fibroblast proliferation and adhesion, as well as collagen deposition. In a full-thickness skin injury model in rats, the PLA/GE/CNT combined with electrical stimulation significantly accelerated wound healing with high quality. In summary, the PLA/GE/CNT fabricated via electrospinning combines the excellent biocompatibility of PLA/GE with the conductivity of CNT. When used together with external electrical stimulation, it effectively promotes changes in fibroblast behavior and accelerates wound healing. Our study provides support for the development of electrospun fiber-based conductive dressings combined with external electrical stimulation to promote wound healing. Graphical A conductive electrospun polylactic acid/gelatin/carbon nanotube dressing is developed and combined with exogenous electrical stimulation to accelerate skin wound healing. This integrated platform provides synergistic biophysical and electrical cues that significantly promote fibroblast proliferation, enhance robust collagen network deposition, and facilitate dermal remodeling, presenting a promising therapeutic strategy for repairing full-thickness skin defects.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·5822-5831
·
IF 3.9
Kang Du,Changzhi Yin,Zhengyu Zou,Mingfei Cheng,Yiyang Cai,Jiaqing Yang,Meng Zhang,Wenzhong Lu,Shengxiang Wang,Wen Lei
Novel BaCa 2 M 3 O 9 ( M = Si, Ge) microwave dielectric ceramics were prepared via solid-state reaction with sintering at 1125°C–1275°C for 5 h. Single-phase BaCa 2 M 3 O 9 ( M = Si, Ge) ceramics were obtained according to stoichiometry. The single-phase BaCa 2 Ge 3 O 9 ceramic was confirmed through Rietveld refinement and high-resolution transmission electron microscopy/selected area electron diffraction and synthesized for the first time. The BaCa 2 M 3 O 9 ( M = Si, Ge) exhibited a triclinic structure with a P 1 ¯ $\bar 1$ space group and good microwave dielectric properties. The ε r , Q × f , and τ f values of BaCa 2 M 3 O 9 ( M = Si, Ge) ceramics are mostly dominated by the relative density, ionic polarizability, relative covalence, and bond energy of M –O bond, respectively. A high Q × f value (61 800 GHz at 16.3 GHz) was obtained in BaCa 2 Ge 3 O 9 ceramic due to its high r c (Ge–O) and low intrinsic dielectric loss. The BaCa 2 Si 3 O 9 ceramic exhibited small | τ f | value (‒36.4 ppm/°C) due to its large E Si-O . Excellent microwave dielectric properties ( ε r = 8.31, Q × f = 61 800 GHz, and τ f = ‒58.7 ppm/°C) were obtained for the BaCa 2 Ge 3 O 9 ceramic.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 21
·7778-7786
·
IF 6.482
Wei Wei,Yongya Zhang,Lei Liang,Kefeng Wang,Qingfeng Zhou,Yanli Zhou,Hua Wang
Metal germanium (Ge) with a high theoretical capacity of 590 mA h g−1 is regarded as a promising anode material for sodium ion batteries, but it suffers from a fast capacity decay problem due to the serious agglomeration of Ge particles caused by the drastic volume change during the sodiation/desodiation process. Constructing highly dispersed ultrafine Ge nanoparticles is a possible way to address this problem. However, reported methods to obtain highly dispersed metal nanoparticles encountered problems of poor electrochemical activity or non-uniform particle size. In this work, we proposed a new in situ confined polymerization method for preparing highly dispersed Ge quantum dots (QDs). Due to the high dispersion of Ge QDs in carbon frameworks derived from poly(ionic liquid) networks, the obtained Ge@C nanocomposite could effectively avoid the agglomeration of Ge particles. When applied as the anode material for sodium ion batteries, the Ge@C nanocomposite shows ultra-long cycle life and high rate capability. At a current density of 1500 mA g−1, the Ge@C electrode could display a high capacity of 201 mA h g−1 after 5000 cycles. This method could be extended to prepare other highly dispersed metal nanoparticles and achieve fairly efficient electrode materials for new-type secondary batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Fei Li,Zhiguo Xia,Quanlin Liu
Controlled synthesis of absorber materials Cu2ZnGeS4 (CZGS) has been performed using different Ge precursors, including GeCl4 and the self-synthesized Ge complexes with Ge-glycolic acid (denoted as Ge-Gly), Ge-tartaric acid (denoted as Ge-Tar), and Ge-citric acid (denoted as Ge-Cit). The grain size of as-prepared CZGS nanocrystals (NCs) is dependent on the Ge precursors. All four Ge precursors enabled the wurtzstannite CZGS phase formation. The Ge-Cit precursor led to the formation of monodispersed NCs owing to the fact that the undissolved metal-Cit complex in OLA absorbed the small CZSG NCs and avoided the irregular crystalline behavior. The other three precursors induced two different sizes, and the corresponding reaction mechanism has been proposed. Moreover, the Cu2ZnGe1–xSnxS4 NCs with different Ge/Sn ratios were prepared using the Ge-Cit precursor, verifying the general effect on the phase formation and selective grain sizes. The compositional effect on the band gap variation and morphologies of Cu2ZnGe1–xSnxS4 was also studied.
研究领域:
材料科学
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 47
·20698-20705
·
IF 3.829
Dongfang Hou,Xianluo Hu,Yanwei Wen,Bin Shan,Pei Hu,Xiaoqin Xiong,Yun Qiao,Yunhui Huang
Sillenite Bi12MO20 (M = Ti, Ge, Si) nanofibers have been fabricated through a facile electrospinning route for photocatalytic applications. Uniform Bi12MO20 (M = Ti, Ge, Si) nanofibers with diameters of 100–200 nm and lengths of up to several millimeters can be readily obtained by thermally treating the electrospun precursors. The photocatalytic activities of these nanofibers for degradation of rhodamine B (RhB) were explored under UV-visible light. The band structure and the degradation mechanisms were also discussed. The fibrous photocatalysts of Bi12TiO20, Bi12SiO20 and Bi12GeO20 exhibit different photocatalytic behaviours, which are attributed to the microstructure, band gap, and electronic structures.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）