Journal of Energy Storage
·
2026
·
IF 10.7
Hong Huang,Ding-Rong Deng,Jin-Wei Yan,Shuang-Lin Cai,Yong-Qi Ye,Wen-Qi Lv,Chu-Tao Wang,Ye Zeng,Gui-Fang Li,Ming-Ming Tao,Xiao-Hong Fan,Qi-Hui Wu
Ge doping stabilizes the cubic phase, enhances ionic conductivity and improves the sintering activity of garnet LLZO. • Further V co-doping introduces high-valence V ions to tune Li vacancy concentration and create ample Li + migration channels. • Co-doping optimizes interfacial Li + distribution and inhibits insulating Li 2 CO 3 formation. • Smaller Ge 4+ and V 5+ substitute Zr sites to widen Li + migration channels. Garnet-type solid electrolyte lithium lanthanum zirconium oxide (Li 7 La 3 Zr 2 O 12 , LLZO) has attracted extensive research attention owing to the high ionic conductivity of its cubic phase. However, cubic-phase LLZO readily transforms into tetragonal-phase LLZO at room temperature, which degrades its ionic conductivity. In addition, conventional cation doping strategies frequently yield poor densification as a result of inferior sintering activity. In this work, Ge/V bimetallic co-doped LLZO solid electrolytes are synthesized via the conventional solid-state sintering method, and the effects of Ge/V co-doping on the cubic phase stability and ion transport properties of LLZO are systematically investigated. Material characterization results reveal that Ge/V co-doping distorts the lattice and generates lithium vacancies, which collectively stabilize the cubic crystal phase and optimize the Li + migration bottlenecks. Meanwhile, Ge/V co-doping improves the sintering activity and enhances the surface densification of LLZO. The LLZO-GV electrolyte delivers an ionic conductivity of 3.61 × 10 −4 S·cm −1 at room-temperature with a lithium-ion transference number of 0.54, with an electrochemical stability window up to 5.33 V. Electrochemical characterizations of the assembled LFP/LLZO-GV/Li full cell reveal that it delivers a specific capacity of 161.39 mAh g −1 at 25 °C and 0.2C, and retains a capacity retention of 96.6% after 100 cycles at 25 °C and 0.1C. Moreover, the Li//Li symmetric cell can stably cycle for 600 h at a current density of 0.3 mA cm −2 and exhibits superior rate capability under various current densities. This bimetallic co-doping strategy provides an effective route to develop high-performance all-solid-state lithium batteries.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yao Chen,Lianbo Ma,Xiaoping Shen,Zhenyuan Ji,Aihua Yuan,Keqiang Xu,Sayyar Ali Shah
Germanium (Ge), as an anode material for lithium-ion batteries (LIBs), has received considerable attention because of its high theoretical capacity and excellent electrochemical performance. However, Ge anode usually undergoes large volume expansion during lithium insertion/extraction, resulting in severe structural pulverization and fast capacity fading. Here, we report an efficient cationic polymer-assisted in-situ reduction method for the preparation of highly uniform Ge/RGO composites (RGO = reduced graphene oxide) using GeO 2 , instead of expensive and toxic GeX n (X = Cl, Br and I), as Ge source. In this protocol, GeO 3 2− anions are well adsorbed on cationic polymer-modified graphene oxide sheets by electrostatic interaction , followed by in-situ reduction, which results in the growth of ultrafine Ge nanoparticles ( ca . 5 nm) on RGO sheets to form highly uniform sandwich-like structure. Benefiting from the tiny size of Ge nanoparticles and the well-conductive RGO sheets, the Ge/RGO anodes exhibit a high reversible capacity of 960 mAh g −1 after 100 cycles at 0.2 A g −1 , an excellent rate capability of 631 mAh g −1 at 5 A g −1 , and 705 mAh g −1 after 350 cycles at 1 A g −1 (with the capacity fading of only 0.07% per cycle based on the initial discharge capacity of 940 mAh g −1 ). More impressively, by coupling with LiFePO 4 cathode, the full battery also shows a good electrochemical performance in terms of specific capacity and cycling stability. The simple, low-cost and environmental friendly synthesis strategy together with the outstanding lithium-storage performance of Ge/RGO composites affords a promising anode material for next-generation LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Mian Huang,Wei Xu,Yang Shen,Yuan-Hua Lin,Ce-Wen Nan
Ge-doped Li 7 La 3 Zr 2 O 12 (LLZ) is prepared via the conventional solid-state reaction. Our results showed that doping Ge of less than 1 wt% could stabilize the cubic phase of garnet-type LLZ and also increase its ionic conductivity up to 8.28 × 10 −4 S/cm at room temperature . When the content of Ge dopant is higher, GeO 2 impurity phase would appear and there coexists cubic and tetragonal mixed structures, lowering the conductivity. By combining X-ray absorption near-edge spectroscopy and full multiple-scattering theory, we find that Ge more likely enters into the Li and La crystallographic sites instead of the Zr site, which provides understanding of the micro-structural modulation by Ge dopants and the subsequent enhancement in the ionic conductivity.
研究领域:
材料科学
·
固体化学
·
光谱学
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产品关联
DOI
高影响因子
Optical Materials Express
·
2018
·Vol. 8
·期 7
·1754-1761
·
IF 2.566
Yantao Xu,Xusheng Xiao,Xiaoxia Cui,Fei Gao,Jian Cui,Xiaogang Liu,Haitao Guo,Jiangbo She,Gang Chen,Min Lu,Bo Peng
The diamagnetic performance of GeS2-Ga2S3 and GeS2-Ga2S3-PbI2 chalcogenide glasses were investigated, and the composition, wavelength and temperature dependences of the Verdet constant were discussed in detail. It indicates that the contributions to the Verdet constant for each kind of ion are in the order of VPb>VGa>VGe in these chalcogenide glasses, and the Becquerel rule is proved to be an effective guidance for predicting the Verdet constant value. A large Verdet constant is obtained in 68GeS2·17Ga2S3·15PbI2 composition glass and the value is 0.230 min·G−1·cm−1 at 635nm, which is greatly larger than those of commercial diamagnetic glasses. Besides, the temperature coefficient of Verdet constant can be regarded as a constant between 278 and 368 K, indicating these chalcogenide glasses are good candidates for magneto-optical devices in temperature instability conditions.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Bangrun Wang,Jun Jin,Kun Rui,Chenxi Zhu,Zhaoyin Wen
The hierarchical porous germanium/reduced graphene oxide (Ge/rGO) microspheres are synthesized through an industrially scalable spray drying technique using commercial germanium dioxide (GeO 2 ) as raw material. The Ge/rGO microspheres architecture with Ge nanoparticles homogeneously embedded in the three-dimensional (3D) interconnected conductive rGO network. When employed as anode for lithium ion batteries (LIBs), the as-obtained Ge/rGO microspheres exhibit excellent electrochemical performance with a high reversible capacity (811 mAh g −1 after 1000 cycles), ultra-long cycling life (over 80% capacity retention from the 6th to 1000 th cycles at 1 C), and high rate capability (380 mAh g −1 at 20 C). In addition, the full cell consisting of Ge/rGO-2 anode and LiFePO 4 cathode also delivers good cycling stability with high energy density . The 3D conductive rGO network provides the pathway for electron transportation and promotes to form stable solid electrolyte interphase (SEI) layer. Furthermore, the void space deduced from the porous structure can effectively accommodate volume changes and enhance the structural integrity of Ge/rGO microspheres. This facile and scalable synthetic strategy is beneficial for large-scale production of Ge-based electrode materials for further application in high energy and power density LIBs.
研究领域:
材料科学
·
电化学
·
储能技术
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产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 43
·18218-18224
·
IF 7.394
Jing Liu,Guowen Meng,Zhongbo Li,Zhulin Huang,Xiangdong Li
Surface-enhanced Raman scattering (SERS) is considered to be an excellent candidate for analytical detection schemes, because of its molecular specificity, rapid response and high sensitivity. Here, SERS-substrates of Ag-nanoparticle (Ag-NP) decorated Ge-nanotapers grafted on hexagonally ordered Si-micropillar (denoted as Ag-NP@Ge-nanotaper/Si-micropillar) arrays are fabricated via a combinatorial process of two-step etching to achieve hexagonal Si-micropillar arrays, chemical vapor deposition of flocky Ge-nanotapers on each Si-micropillar and decoration of Ag-NPs onto the Ge-nanotapers through galvanic displacement. With high density three-dimensional (3D) “hot spots” created from the large quantities of the neighboring Ag-NPs and large-scale uniform morphology, the hierarchical Ag-NP@Ge-nanotaper/Si-micropillar arrays exhibit strong and reproducible SERS activity. Using our hierarchical 3D SERS-substrates, both methyl parathion (a commonly used pesticide) and PCB-2 (one congener of highly toxic polychlorinated biphenyls) with concentrations down to 10−7 M and 10−5 M have been detected respectively, showing great potential in SERS-based rapid trace-level detection of toxic organic pollutants in the environment.
研究领域:
材料科学
·
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 20
·6166
·
IF 3.623
Hongbo Gao,Kewang Zhang,Ailijiang Abudurusuli,Chen Bai,Zhihua Yang,Kangrong Lai,Junjie Li,Shilie Pan
Two new diamond-like (DL) chalcogenides, Li2MgGeSe4and Li2MgSnSe4, have been successfully synthesized using a conventional high-temperature solid-state method. The two compounds crystallize in the non-centrosymmetric space groupPmn21witha= 8.402 (14) Å,b= 7.181 (12) Å,c= 6.728 (11) Å,Z= 2 for Li2MgSnSe4, anda= 8.2961 (7) Å,b= 7.0069 (5) Å,c= 6.6116 (6) Å,Z= 2 for Li2MgGeSe4. The calculated results show that the second harmonic generation (SHG) coefficients of Li2MgSnSe4(d33= 12.19 pm/v) and Li2MgGeSe4(d33= −14.77 pm/v), mainly deriving from the [MSe4] (M = Ge, Sn) tetrahedral units, are close to the one in the benchmark AgGaS2(d14= 13.7 pm/V). The calculated band gaps for Li2MgSnSe4and Li2MgGeSe4are 2.42 and 2.44 eV, respectively. Moreover, the two compounds are the first series of alkali and alkaline-earth metal DL compounds in the I2-II-IV-VI4family, enriching the structural diversity of DL compounds.Keywords:diamond-like structure;chalcogenides;infrared nonlinear optical materials;second harmonic generation
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
·
2019
·
IF 3.414
Hongling Zhou,Huihui Cao,Yuanru Zheng,Zibin Lu,Yuyao Chen,Dongyi Liu,Huayi Yang,Jingyu Quan,Chuying Huo,Junshan Liu,Linzhong Yu
Ethnopharmacological relevance Liang-Ge-San (LGS) is a traditional Chinese medicine formula that commonly used in acute inflammatory diseases . However, the anti-inflammatory effects and the underlying mechanisms of LGS are not fully studied. Aim of the study This study aims to investigate the anti-inflammatory activity and explore the underlying mechanisms of LGS in zebrafish and cell inflammation models. Materials and methods LPS-induced zebrafish inflammation model was established by LPS-yolk microinjection. The protective effect of LGS on zebrafish injected with LPS was observed using survival analysis. Infiltration of inflammatory cells was determined by H&E staining assay. Expression levels of key inflammatory cytokines TNF-α and IL-6 were measured by q-PCR assay. Recruitment of neutrophils and macrophages were observed by fluorescence microscopy , SB staining and NR staining. In vitro anti-inflammatory effects of LGS were evaluated on LPS-stimulated RAW 264.7 cells. The generation of IL-6 and TNF-α was detected by ELISA . The protein expression levels of JNK, p-JNK (Thr183/Tyr185), Nur77 and p-Nur77 (Ser351) were determined by Western blotting . Finally, two additional inflammatory models in zebrafish, which were induced by CuSO 4 or tail fin injury, were also established and the recruitment of neutrophils and macrophages were observed for the determination of the anti-inflammatory activity of LGS. Results LGS protected zebrafish against LPS-induced death and dose-dependently inhibited LPS-induced acute inflammatory response in zebrafish, as indicated by increased survival rate, reduced infiltration of inflammatory cells, decreased recruitment of macrophages and neutrophils, and downregulated expression levels of TNF-α and IL-6. Additionally, LGS inhibited the secretion of TNF-α and IL-6, increased the expression of Nur77, and reduced the expression of p-Nur77 (Ser351) and p-JNK (Thr183/Tyr185) in LPS-stimulated RAW 264.7 cells. The anti-inflammatory action of LGS was also observed in another two zebrafish inflammation models, which was supported by the inhibition on neutrophils and macrophages recruitment. Conclusion The present study demonstrates that LGS possesses anti-inflammatory activity in zebrafish inflammation models and LPS-stimulated RAW 264.7 cells, which is related to the inhibition on p-JNK and p-Nur77. This finding provides a pharmacological basis for LGS in the control of inflammatory disorder.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zidong Tan,Xin Jin,Yong Zhen,Chang Wei,Xingbin Li,Zhigan Deng,Minting Li
Selective extraction of indium and germanium from natural resources due to their important role in high-tech fields is attracting more and more attention. In this paper, indium and germanium were recovered from In-Ge residue leaching solution by the selective solvent extraction of indium with D2EHPA and the precipitation of germanium using tannin. This process included two main stages: indium-selective solvent extraction and germanium-selective precipitation. In the first stage, indium was extracted by using an organic phase containing 15% D2EHPA and 85% kerosene. The indium-loaded organic phase was washed with 0.5 M H 2 SO 4 and then stripped by 4 M HCl solution to obtain an indium extraction ratio of 99% and a stripping ratio of 98.3%. In the second stage, the pH of the raffinate was adjusted to 3.5–4.0 with ZnO dust and then mixed with tannin. Germanium (99%) was selectively precipitated as a tannin-germanium complex. The washed tannin-germanium complex was baked at 500 °C for 3 h to produce a germanium concentrate. By studying the separation coefficients of indium, germanium, and zinc (1994 and 1093, respectively), and controlling the reaction conditions, the maximum separation of indium, germanium, and zinc was obtained. The extraction mechanism of indium from sulfuric acid solution by D2EHPA and element migration during the precipitation of germanium using tannin were also studied. This proposed process flow can be used to selectively recover germanium and indium from In-Ge residue leaching solutions.
研究领域:
冶金学
·
材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 21
·1-13
·
IF 2.8
Su Congxue,Tao Wenlong,Chen Lianchun,Che Haiyan,Wang Ruijuan,Fan Jun,Qin Xingliu,Chen Zhilin,Fang Liang
Orthorhombic olivine-structured LiTmRO 4 (R = Si, Ge) ceramics were synthesized using a solid-state reaction. Promising microwave dielectric properties of ε r = 8.18, τ f = 13.7 ppm/°C and a high-quality factor ( Q × f ) of 24,274 GHz for LiTmSiO 4 were obtained at 1130 °C, and ε r = 8.67, τ f = − 24.4 ppm/°C and Q × f = 19,231 GHz for LiTmGeO 4 were achieved at 1090 °C. According to the bond valence results, Tm 3+ and Ge 4+ presented a compressed state, but Li + exhibited a strong rattling state in LiTmGeO 4 , which led to a higher ε r than ε theo . The integrated effect of the rattling cations (Li + and Si 4+ ) and a compressed cation (Tm 3+ ) in LiTmSiO 4 resulted in a smaller positive deviation ∆ ε r . The larger packing fraction of LiTmSiO 4 contributed to a higher Q × f than that of LiTmGeO 4 . The R–O bond in both ceramics played a leading role in influencing Q × f according to the Phillips–Van Vechten–Levine chemical bond theory.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Fei Fan,Dechao Wang,Zengyi Li,Wulong Lu,Jianwei Liu,Xiaoyi Wei,Xu Cheng,Houxiang Sun,Huabing Zhang,Zhiping Chen,Wenwu Zhou
Developing high-performance supported non-precious metal copper-base catalysts for CO 2 hydrogenation is of extreme significance for the successful production of green methanol (CH 3 OH). Herein, Cu/ n Ge-CeO x catalysts ( n = 0, 0.25, 0.5, and 1 wt%) were synthesized via the incipient wetness impregnation method and comprehensively investigated using experiments and DFT calculations. Among all the catalysts, the Cu/0.5Ge-CeO x catalyst exhibited the highest concentration of oxygen vacancies, the smallest Cu grain size, and the most favorable regions for CO 2 adsorption. Compared to the Cu/0Ge-CeO x catalyst, the CH 3 OH yield was significantly improved over the Cu/0.5Ge-CeO x catalyst in the temperature range of 220–260°C under 3 MPa and a gas hourly space velocity of 3000 mL·g cat −1 ·h −1 . Especially at 260°C, the yield sharply increased from 35.23% to 82.21%, and this catalyst maintained high activity for 100 h. This was because the inert pair effect of the introduced Ge promoters induced lattice distortion on the support surface and regulated its microregion electron structures, while simultaneously establishing a highly active interface on the adjacent Cu cluster. This not only enabled an integrated process of in situ activated CO 2 and hydrogenation, but also inhibited the HCOO pathway, lowered the barrier of the rate-controlling step of the RWGS pathway, and reconciled some of its competing branching routes.
研究领域:
催化
·
材料科学
·
环境化学
·
化学工程
·
计算化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Shuaixing Jin,Na Li,Hao Cui,Chengxin Wang
Decreasing particle size has always been reported to be an efficient way to improve cyclability of Li-alloying based LIBs. However, nanoparticles (NPs) tend to agglomerate and evolve into lumps, which in turn limits the cycling performance. In this report, we prepared a unique nanostructure, graphene-coated Ge NPs are highly dispersed on vertically aligned graphene (Ge@graphene/VAGN), to avoid particle agglomeration and pulverization. Remarkable structure stability of the sample leads to excellent cycling stability. Upon cycling, the anode exhibits a high capacity of 1014 mAh g–1, with nearly no capacity loss in 90 cycles. Rate performance shows that even at the high current density of 13 A g–1, the anode could still deliver a higher capacity than that of graphite.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）