Journal of Energy Chemistry
·
2025
·
IF 14.9
Xin Qin,Zuqiang Ge,Yafei Wang,Guanzhong Ma,Fei Yang,Qian Xu,Yanpeng Li,Debin Kong,Junwei Han,Linjie Zhi
Micro silicon (mSi) is a promising anode candidate for all-solid-state batteries due to its high specific capacity, low side reactions, and high tap density. However, silicon suffers from its poor electronic and ionic conductivity, which is particularly severe on a micro scale and in solid-state systems, leading to increased polarization and inferior electrochemical performance. Doping can broaden the transmission pathways and reduce the diffusion energy barrier for electrons and lithium ions. However, achieving effective, uniform doping in mSi is challenging due to its longer diffusion paths and higher energy barriers. Therefore, current doping research is primarily limited to nanosilicon. In this study, we successfully used a Joule-heating activated staged thermal treatment to achieve full-depth doping of germanium (Ge) in the mSi substrate. The Joule-heating process activated the mSi substrate, resulting in abundant vacancy defects that reduced the diffusion barrier of Ge into the silicon lattice and facilitated full-depth Ge doping. Surprisingly, the resulting Si-Ge anode exhibited significantly enhanced electrical conductivity (70 times). Meanwhile, the improved Li-ion conductivity in mSi and the reduced Young’s modulus enhance the electrode reaction kinetics and integrity after cycling. Ge-doped silicon anodes demonstrate excellent electrochemical performance when applied in sulfide solid-state half-cells and full-cells. This work provides substantial insights into the rational structural design of mSi alloyed anode materials, paving the way for the development of high-performance solid-state Li-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
·
固体物理
·
储能
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2017
·
IF 9.466
Bin-Wen Liu,Min-Yi Zhang,Xiao-Ming Jiang,Shu-Fang Li,Hui-Yi Zeng,Guo-Qiang Wang,Yu-Hang Fan,Yong-Fei Su,Chunsen Li,Guo-Cong Guo,Jin-Shun Huang
Two new polar polyselenides Rb4Ge4Se12 (1) and Cs4Ge4Se12 (2) with rarely reported dimeric [Ge2Se4(μ-Se2)]4– units were synthesized. They present large second-harmonic generation (SHG) intensities of 7.5 and 6.5 times that of the benchmark AgGaS2 with type I phase-matching behavior, high laser-induced damaged thresholds, a wide transmission region and congruently melting behavior, making them excellent candidates for IR nonlinear optical (NLO) applications. The SHG functional motifs of both compounds are determined to be [Ge2Se4(μ-Se2)]4– unit by time-dependent density functional theory calculation, which further reveals that charge transfers from the lone pairs of terminal Se atoms to the five σ* orbitals of five-membered ring Ge2Se3 have a predominant contribution to the total SHG effect.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shimeng Zhang,Zeyu He,Zhiguo Wang,Zhenggang Rao,Yunlong Hu,Chunchun Li,Longlong Shu
The diopside-structured CaZnGe 2 O 6 ceramics were synthesized using the conventional solid-state reaction method in this study, and their crystal structure, microstructural evolution, and microwave dielectric properties were systematically investigated. The XRD and Rietveld refinement analyses confirmed that CaZnGe 2 O 6 crystallizes in the monoclinic crystal system with a C 2/ c space group. The intrinsic microwave dielectric properties of the ceramics were evaluated using far-infrared spectroscopy. The ceramic structure exhibits high density and microstructural homogeneity after sintering at 1130 °C, resulting in exceptional microwave dielectric properties achieved at this optimal temperature ( ε r = 8.78 Q×f = 63,782 GHz, τ f = −66.4 ppm/°C). These findings highlight the potential application of CaZnGe 2 O 6 ceramics as low-permittivity materials suitable for microwave devices.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Di Qian,Yahong Jin,Yanmei Li,Haoyi Wu,Yihua Hu
The continually advancing near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) hold pivotal significance in optical imaging and NIR spectroscopy. Cr 3+ -doped garnet broadband NIR phosphors have attracted considerable attention owing to their high optical performance enabled by the rigid structure. Nonetheless, the emission wavelength is severely restricted, and longer wavelength emissions usually result in inferior quantum efficiency and poor luminescence stability. In this work, the concurrent reconstruction of dodecahedral and octahedral sites by introducing [Na + -Sn 4+ ] unit in the framework of Na 2 CaSn 2 Ge 3 O 12 garnet contributes to the Cr 3+ broadband NIR emission spanning 700–1200 nm, with a peak at 820 nm. Utilizing a charge compensation strategy via Ta 5+ codoping largely boosts the internal quantum efficiency (IQE) of Na 2 CaSn 2 Ge 3 O 12 :Cr 3+ from 93.06 % up to 95.04 %. Trap-mediated energy compensation is proposed to achieve a record-breaking zero-thermal-quenching behavior (99.39 %@423 K) of Cr 3+ -doped garnet with such a longer wavelength emission. The encapsulated prototype broadband NIR pc–LED gives rise to an overwhelming NIR output power of 590.9 mW@1300 mA and a photoconversion efficiency (PCE) of 32.62 % at 30 mA, rendering exceptional performance in night vision, detection, and NIR imaging applications.
研究领域:
光学材料
·
发光材料
·
光电子学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 48
·23116-23125
·
IF 6.97
Yijun Liu,Minghui Wu,Zhaoyang Sun,Shengxue Yang,Chunguang Hu,Li Huang,Wanfu Shen,Bin Wei,Zhongchang Wang,Shiqi Yang,Yu Ye,Yan Li,Chengbao Jiang
Low-symmetry two-dimensional (2D) materials with unique in-plane anisotropy can promote both fundamental science and practical applications in optics, optoelectronics, electronics, and polarization detection. As a member of 2D materials, doping/alloying material systems have gained great attention owing to the tunable bandgap and special properties. However, the in-plane anisotropic optical and electrical properties of these 2D alloy materials have rarely been reported. In this work, low-symmetry 2D Ge(1−x)SnxSe2 (x = 0–1.0) alloy flakes have been synthesized by chemical vapor deposition (CVD) with a bandgap varying from 1.55 eV (GeSe2, x = 0) to 1.90 eV (SnSe2, x = 1.0). Angle-resolved polarized Raman spectroscopy (ARPRS) is used to confirm the in-plane vibrational anisotropy, and azimuth-dependent reflectance difference microscopy (ADRDM) is applied to visualize the in-plane optical anisotropy. Polarization-dependent transmission spectroscopy (PDTS) is carried out to reflect the in-plane absorptional anisotropy and linear dichroism, and birefringence characteristics are also found in the subsequent studies. All of the results indicate the unique in-plane optical anisotropy and birefringence characteristics of the 2D Ge(1−x)SnxSe2 alloy flakes, providing new opportunities for polarization-controlled devices, optical wave plates, and polarizers.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Chenguang Liu,Yinchao Zhao,Ruowei Yi,Hao Wu,Wenbin Yang,Yinqing Li,Ivona Mitrovic,Stephen Taylor,Paul Chalker,Rui Liu,Li Yang,Cezhou Zhao
Here, we demonstrate a facile method to synthesize an amorphous GeO x -coated MXene nanosheet structure as the anode in lithium-ion batteries. By using the GeO 3 2− as the precursor, NaBH 4 as the reduction agent, we performed a one-pot in situ synthesis to prepare a composite of GeO x nanoparticles coated on MXene nanosheet. The size of the GeO x nanoparticles is approximately 50 nm, which offers abundant contact surface between active materials with the electrolyte, as well as fast pathways for Li-ion interaction. Moreover, the unique two-dimensional MXene nanosheet serves as the excellent conductive additives to improve the electrochemical stability and electrical conductivity of composite when used in LIBs. The results indicate that the GeO x /MXene nanosheet structure significantly improves the stability during the lithiation/delithiation processes, with the enhanced capacity through an improved kinetic process. Another attractive element of this novel anode is the flexibility to tune the electrochemical properties by using different combination of binder and solvent when the slurry is prepared for the electrode fabrication. The electrode prepared with polyvinylidene fluoride binder and N-methyl pyrrolidinone solvent exhibits an excellent sustainable capacity of 381 mAh g −1 at 15 A g −1 . By contrast, the electrode with lithium polyacrylate and de-ionized water delivers a reversible capacity of 950 mAh g −1 at 0.5 A g −1 after 100 cycles. These interesting results are ascribed to the inner characteristic structure of the two types of electrodes, which have been verified by electrochemical kinetics and scanning electron microscopic images. It also reveals that the different dispersion state is responsible to the difference of electrochemical properties, which highlights the importance of the electrode design for high-performance lithium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 7
·622
·
IF 2.4
Haoyu Zhao,Junliang Zhu,Zhonghe Zhu,Lin Bo,Wenying Wang,Xingshuo Liu,Changcun Li,Degang Zhao
Cubic phase SnSe-based materials have great potential in the field of thermoelectricity due to their reduced carrier scattering, increased band degeneracy, and ultra-low lattice thermal conductivity. Nevertheless, systematic studies on the influence of element doping on the thermoelectric properties of cubic SnSe-based materials are still relatively scarce. To enrich the research in this field, this work investigates the effects of Ge doping on the phase composition, electrical and thermal transport properties of cubic Sn0.50Ag0.25Bi0.25Se0.50Te0.50thermoelectric materials. X-ray diffraction (XRD) analysis confirmed that the Ge-doped samples exhibited a single cubic phase structure, while scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) revealed a uniform distribution of elements within the samples. The results indicate that increasing the Ge doping content substantially enhances their electrical conductivity, albeit at the expense of elevated thermal conductivity. By optimizing the content of Ge-doping, the thermoelectric figure of merit (ZT) reached 0.74 at 750 K. Notably, while moderate Ge doping enhances electrical transport properties, excessive doping leads to a significant rise in thermal conductivity, ultimately constraining further thermoelectric performance gains.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2012
·Vol. 159
·期 10
·G107
·
IF 2.59
L. Z. Pei,Z. Y. Cai,Y. K. Xie,Y. Q. Pei,C. G. Fan,D. G. Fu
The electrochemical responses of ascorbic acid have been investigated by cyclic voltammetry on the CuGeO3/20wt% polyaniline nanowire modified glassy carbon electrode at room temperature. The results show that the modified electrode exhibits good analytical performance for the electrochemical detection of ascorbic acid in neutral solution. The intensities of the anodic cyclic voltammogram (CV) peaks increase linearly with the increase of the ascorbic acid concentration from 0.001 to 2 mM and scan rate from 25 to 200 mVs−1. CuGeO3/20wt% polyaniline nanowire modified glassy carbon electrode exhibits good reproducibility, stability, low detection limit of 0.61 μM and 0.26 μM for cvp1 and cvp2, respectively, which is better than those at other modified electrodes.
研究领域:
分析化学
·
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2020
·Vol. 52
·期 6
·1-8
·
IF 1.842
Wang Weirong,Tuo Tianye,Jiang Chun
A facile pathway for solid-state material luminescence enhancement is proposed here by coating graphene on the surface of luminescent material. Ln 3+ (Yb 3+ /Er 3+ )-doped germanium tellurite glasses are prepared by conventional melting and quenching method. With the excitation of 980 nm laser diode, the photo-luminescence intensities of the graphene-coated and uncoated glass samples are measured with different incidence angle of excitation light. When the incidence angle is less than 15°, luminescence enhancement can be observed in the coated samples compared with uncoated one. The insight for the enhancement is also discussed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 19
·10160-10165
·
IF 7.76
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Cu2ZnSn(S,Se)4 (CZTSSe) semiconductors have been a focus of extensive research effort owing to low-toxicity, high abundance and low material cost. Yet, the CZTSSe thin film solar cell has a low open-circuit voltage value that presents challenges. Herein, using GeSe2 as a new Ge source material, we have achieved a wider band gap CZTSSe-based semiconductor absorber layer with its band-gap controlled by adjusting the ratio of SnS2 : GeSe2 used. In addition, the Cu2Zn(Sn,Ge)(S,Se)4 thin films were prepared with optimal Ge doping (30%) and solar cells were fabricated to attain a respectable power conversion efficiency of 4.8% under 1.5 AM with an active area of 0.19 cm2 without an anti-reflection layer.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Yingying Chen,Lifang Chen,Zhi Yang,Wenhao Wang,Pengcheng Lin,Bing Yao
The deterioration of climate exacerbates the freshwater crisis. Solar-thermal interfacial evaporation, using sunlight as a driving energy source, is a promising approach to provide an effective solution to freshwater shortages. However, the low energy conversion efficiency and expensive evaporator manufacturing are still to be resolved. Herein, a strategy of clean water harvesting by solar-absorbing germanium@k-carrageenan (Ge@CA) evaporator demonstrating superior energy conversion is proposed. The Ge nanoparticles exhibit a significant solar absorption of 92.33% to achieve efficient solar-thermal conversion. The CA hydrogel provides three-dimensional water transmission channels to the evaporating surface. Meanwhile, the Ge nanoparticles can be fabricated by a facile ball-milling method. The CA as a cheap biomass can be easily interacted with KCl to obtain the porous hydrogel. Taking the advantages of Ge nanoparticles and CA hydrogel, the Janus-type Ge@CA hydrogel evaporator can achieve an evaporation rate of 2.88 kg m −2 ·h −1 and a solar-vapor conversion efficiency of 82.65% under 1 sun irradiation. Furthermore, the evaporator can produce thermoelectricity with the output voltage of 140.95 mV and the short-circuit current of 13.32 mA, yielding a power of 1.17 W m −2 . This reported solar device has huge potential for cutting-edge solar harvesting and usage.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Zhijian Sun,Lei Liu,Yuxiao Lu,Guangyue Shi,Jiajun Li,Lei Ma,Jie Zhao,Hongli An
NASION-type Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) is prepared by a novel sol-gel method using low cost inorganic germanium (GeO 2 ) as the precursor. The composition and phase transformation during the heating of the LAGP precursors are analyzed using thermogravimetric-differential scanning calorimetry (TG-DSC) and X-ray diffraction (XRD). The structures and morphologies of the LAGP are characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the LAGP annealed at 900 ℃ is partially crystallized and consists of a large number of nanoscale grains surrounded by amorphous regions. The LAGP particles present an irregular morphology with a large size distribution over a range of 0.2–1 μm. In addition, ionic conductivities of the prepared LAGP first increase and then decrease with an increase in the sintering temperature and time. A high ionic conductivity (4.18 × 10 −4 Scm -1 ) with an activation energy of 0.30 eV are obtained for the LAGP sample sintered at 900 °C for 8 h.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）