ELECTROCHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.7
Kewei Shu,Cunguo Yang,Huizhu Niu,Xiaorui Fuyan,Shuqi Yang,Haihua Wang
GeP 3 is a promising anode material for sodium ion battery due to better conductivity, relatively high theoretical capacity and improved mechanical endurance compared to phosphorus and other phosphides. However unsatisfied rate capability and cycling stability is still an annoying issue that hinders the application of GeP 3 . Here, GeP 3 was hybridized with P doped carbon (PPC) derived from low-cost coal tar pitch to prepare composite electrode. Through ball-milling process, the GeP 3 and PPC was homogenously mixed and form fused, secondary particles as confirmed by electron microscope. The formation of P-C and P-O-C bond between GeP 3 and carbon matrix was evidenced by XPS, and prompted by P doping level and O content in PPC. The electrochemical performance of the composite electrodes was evaluated, demonstrated much enhanced properties compared to bare GeP 3 and also GeP 3 /carbon black electrode. High reversible capacity of 781 mAh/g was achieved by GeP 3 /PPC-950 at 0.05 A/g. At higher current density of 2 A/g, the capacity can maintain at 360 mAh/g, 46% of the value that obtained at 0.05 A/g. The correlation between the structure of carbon and battery performance was discussed. The improvement in battery performance can be attributed to suppressed volume expansion and good conductive network of the GeP 3 /PPC composite, which affected by P doping level and O content of PPC.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 8
·722
·
IF 4.4
Zhengtang Cai,Kaipeng Zheng,Chun Ma,Yu Fang,Yuyang Ma,Qinglin Deng,Han Li
Compared to SnTe and PbTe base materials, the GeTe matrix exhibits a relatively high Seebeck coefficient and power factor but has garnered significant attention due to its poor thermal transport performance and environmental characteristics. As a typical p-type IV–VI group thermoelectric material, W-doped GeTe material can bring additional enhancement to thermoelectric performance. In this study, the introduction of W, Ge1−xWxTe (x= 0, 0.002, 0.005, 0.007, 0.01, 0.03) resulted in the presence of high-valence state atoms, providing additional charge carriers, thereby elevating the material’s power factor to a maximum PFpeakof approximately 43 μW cm−1K−2, while slightly optimizing the Seebeck coefficient of the solid solution. Moreover, W doping can induce defects and promote slight rhombohedral distortion in the crystal structure of GeTe, further reducing the lattice thermal conductivityκlatto as low as approximately 0.14 W m−1K−1(x= 0.002 at 673 K), optimizing it to approximately 85% compared to the GeTe matrix. This led to the formation of a p-type multicomponent composite thermoelectric material with ultra-low thermal conductivity. Ultimately, W doping achieves the comprehensive enhancement of the thermoelectric performance of GeTe base materials, with the peak ZT value of sample Ge0.995W0.005Te reaching approximately 0.99 at 673 K, and the average ZT optimized to 0.76 in the high-temperature range of 573–723 K, representing an increase of approximately 17% compared to pristine GeTe within the same temperature range.
研究领域:
材料科学
·
能源材料
·
热电材料
✓ 已验证
产品关联
DOI
PubMed
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
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
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
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
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Sheng-chao Song,Ding-chuan Zuo,Chang-sheng An,Xia-hui Zhang,Jin-hui Li,Zhen-jiang He,Yun-jiao Li,Jun-chao Zheng
High-capacity germanium-based anode materials are alternative materials for outstanding electrochemical performance lithium-ion batteries (LIBs), but severe volume variation and pulverization problems during charging–discharging processes can seriously affect their electrochemical performance. In addressing this challenge, a simple strategy was used to prepare the self-assembled GeOX/Ti3C2TX composite in which the GeOX nanoparticles can grow directly on Ti3C2TX layers. Nanoscale GeOX uniformly renucleates on the surface and interlayers of Ti3C2TX, forming the stable multiphase structure, which guarantees its excellent electrochemical performance. Electrochemical evaluation has shown that the rate capability and reversibility of GeOX/Ti3C2TX are both greatly improved, which delivers a reversible discharge specific capacity of above 1400 mAh g–1 (at 100 mA g–1) and a reversible specific capacity of 900 mAh g–1 after 50 cycles while it still maintains a stable specific capacity of 725 mAh g–1 at 5000 mA g–1. Furthermore, the composite exhibits an exceptionally superior rate capability, making it a good electrochemical performance anode for LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lu Pan,Yafang Wang,Wanting Wang,Mengting Zhao
Near-infrared (NIR) long persistent luminescent materials, with broad potential applications, have attracted significant research interest, though most studies focus on room-temperature performance. However, designing and synthesizing long-persistent luminescent materials that can form a large number of stable shallow traps at lower temperatures is extremely challenging. In this paper, a series of Cr-doped broadband near-infrared silicon germanate long persistent luminescent phosphors were synthesized by the high-temperature solid-phase method. The optical properties and crystal structural parameters of the phosphors at room temperature were studied systematically. The specific luminescence sources and reasons for the broadening of emission peaks have been discussed. The significant differences in persistent luminescence at different temperatures are caused by the substitution of Ge-Si chemical units in the Na₂CaGe x Si 6-x O₁₄ matrix doped with Cr³⁺ ions. Among the samples, Na 2 CaGe 4 Si 2 O 14 :0.4 mol% Cr 3+ shows excellent persistent luminescence properties and abundant shallow traps at low temperature. This phosphor was tested at low temperature to investigate its potential as an indicator for the temperature changes of biologics.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zhe Xu,Wenchao Li,Xiaohui Wang,Bing Wang,Zhan Shi,Cheng Dong,Shicheng Yan,Zhigang Zou
Developing efficient and stable oxygen evolution catalyst (OEC) is a critical step to overcome the sluggish kinetics of water oxidation. Here, we hydrothermally synthesized a novel OEC, cobalt germanium hydroxide, CoGeO2(OH)2. The inherent Co-bonded hydroxyl groups facilitate the formation of active oxygen evolution reaction intermediates. Meanwhile, the facile leaching of Ge at the OEC–electrolyte interface contributes to surface reconstruction, generating Co-based (oxy)hydroxides, which would weaken its lattice constraint and suppress the excessive corrosion in the OEC bulk. As a result, CoGeO2(OH)2 reveals good catalytic activity and stability. This CoGe-based OEC achieves the overpotential at 10 mA cm–2 (η@10mA) of ∼340 mV, and the turnover frequency of ∼0.08 s–1. And the electrolysis kept at ∼10 mA cm–2 could be sustained for over 350 h. In addition, this p-type CoGeO2(OH)2 is demonstrated to be an effective electrocatalytic overlayer on n-type Ta3N5 photoanode, remarkably decreasing the onset for nearly 400 mV and increasing the photocurrent density at 1.23 VRHE about 3.8 times.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2022
·
IF 4.939
Panyi Wang,Yingying Cui,Senlong Zhao,Renguang Ye,Muzhi Cai,Laurent Calvez,Jean Rocherulle,Feifei Huang,Hongli Ma,Gongxun Bai,Junjie Zhang,Shiqing Xu,Xianghua Zhang
Germano-tellurite niobate glasses have gained significant interest because of their applications in lasers and optical devices. However, germano-tellurite niobate glasses tend to turn brown or dark, which is a major disadvantage for visible optical systems. This work is devoted to exploring the mechanism of this color-changing. Glasses with a molar composition of 70TeO 2 -10GeO 2 -10K 2 O-10Nb 2 O 5 (TGKN) were synthesized by conventional melt-quenching at various melting temperatures. Different melting temperature leads the glasses to present different colors. The precise glass composition was revealed by ICP-OES, and the thermal properties, optical properties, and microstructure of the TGKN glasses were investigated. The XRD patterns and DSC curves suggest that the formation of Te metal is not the principal reason for the color-changing. A novel interpretation that the generation of T-Nb 2 O 5 causes the color-changing was proposed based on the transmittance, XPS and Raman spectra. This work will provide a new perspective on clarifying the effects of melting temperature on color-changing in the germano-tellurite niobate 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 ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yongfeng Bu,Hongyu Zhang,Jinzhi Hu,Wenya Jiang,Qin Kang,Shihao Wang,Yuman Li,Shengda Tang,Hongyu Liang
Metallic selenides are considered as a promising class of alternative anodes for sodium ion batteries due to the high capacity conferred by their hybrid sodium storage mechanism. However, the low reversible volume expansion induced by larger size sodium ion storage greatly limits their cycle life, theoretical capacity mining and electrode thickness enhancement. Herein, a germanium selenide/carbon nanofibers (GeSe/CNFs) sodium storage anode is first reported by taking advantage of the encapsulation and dispersion of electrostatic spinning technology, i.e., GeO 2 is first mixed with polyacrylonitrile and electrospun to form a wrapped structure, followed by in situ pre-oxidation, carbonization, and selenization. For the optimized electrode, it delivers a high capacity up to 567 mAh g −1 based on the mass of GeSe (320 mAh g −1 based on GeSe/CNFs), reaching > 80% of its theoretical capacity, with a > 2300 cycles cycling stability at 1.0 A g −1 . In addition, its capacity barely decays after 700 cycles at near commercial electrode thickness (115 µm, the capacity retention > 47–63% even at the ultrahigh thickness of 187–219 µm). This study opens up new possibilities for the development of Se-based sodium storage anode materials with long life, high capacity and ultra-thick electrode that are expected to meet practical needs.
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
Materials Today Chemistry
·
2023
·
IF 7.3
Zahra Ansarian,Alireza Khataee,Yasin Orooji,Amirreza Khataee,Samira Arefi-Oskoui,Ehsan Ghasali
Developing electrochemically active, stable, and low-cost electrocatalysts for electrochemical devices is a significant breakthrough. Accordingly, MAX phases, emerging three-dimensional materials, are considered outstanding candidates due to their excellent electrocatalytic and electrochemical properties . Herein, the titanium germanium carbide (Ti 3 GeC 2 ) MAX phase with a layered structure manufactured through reactive sintering was regarded as the electrocatalyst. In the current work, the electrocatalytic activity of the Ti 3 GeC 2 was investigated for electrochemical devices. It was observed that adding activated carbon to the Ti 3 GeC 2 enhances the conductivity and active area, leading to an excellent specific capacitance (349 Fg -1 ) for supercapacitors . Also, the capacitance of Ti 3 GeC 2 was increased by increasing the number of cyclic voltammetry cycles. In another application, Ti 3 GeC 2 showed substantial activity for hydrogen and oxygen evolution reactions in alkaline media. As a result, the alkaline water electrolysis system using Ti 3 GeC 2 showed the highest current density of 10 mA cm −2 at 1.36 V and outstanding stability over 400 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
危险品化学品经营许可证（带存储）