Nanoscale
·
2021
·Vol. 13
·期 4
·2399-2407
·
IF 7.79
Guang Su,Shufeng Chen,Huilong Dong,Yafei Cheng,Quan Liu,Huaixin Wei,Edison Huixiang Ang,Hongbo Geng,Cheng Chao Li
Aqueous zinc-ion batteries (ZIBs), due to their sluggish Zn2+ diffusion kinetics, continue to face challenges in terms of achieving superior high rate, long-term cycling and low-temperature properties. Herein, K+ pre-intercalated layered V2O5 (K0.5V2O5) composites with metallic features are capable of delivering excellent zinc storage performance. Specifically, the K0.5V2O5 electrode delivers a high reversible capacity of 251 mA h g−1 at 5 A g−1 after 1000 cycles. Even at a low temperature of −20 °C, high reversible capacities of 241 and 115 mA h g−1 can be obtained after 1000 cycles at 1 and 5 A g−1, respectively. The outstanding electrochemical performance is attributed to the incorporation of K+ into the layered V2O5, which acts as pillars to promote the Zn2+ diffusion and increase the structural stability during cycling. Density functional theory calculations demonstrate that the interlayer doping of K+ can benefit electron migration, and therefore enhance the Zn2+ (de)intercalation kinetics. Meanwhile, the Zn2+ storage mechanism of K0.5V2O5 is revealed by ex situ X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy characterization. This work may pave the way for exploiting high-performance cathodes for aqueous ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 17
·期 11
·4968-4973
·
IF 8.02
Yangyang Ma,Zhongtian Du,Junxia Liu,Fei Xia,Jie Xu
Selective transformation of lignin into value-added aromatics is highly attractive and rather challenging. Catalytic oxidative degradation provides a promising approach to obtain aromatics from lignin while preserving the benzene units. In this study, vanadium-catalyzed aerobic oxidation of 2-phenoxy-1-phenylethanol was studied as a lignin model compound. The solvent played a significant role in the distribution of oxidation products. In the presence of acetic acid, oxidative C–C bond cleavage was preferred, while oxidation products via C–H bond cleavage were rather limited. A one-electron transfer process was involved in the oxidation reaction. The occurrence of vanadium(V) was detected, and the carboxylic group could coordinate to vanadium(V) through exchange with the acetylacetonato ligand during oxidation in the presence of acetic acid.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 13
·4932
·
IF 3.252
Zeyan Zhou,Taotao Zeng,Haoran Zhang,Ding Chen
Vanadium nitride (VN) with a wide working window has been identified as a promising electrode material candidate for batteries due to the high specific capacitance and the excellent electrical conductivity. Here, we have successfully prepared VCN nanobelts, which display mesoporous structure with high specific surface area (54.4 m2g−1) and the total pore volume was 0.266 cm3g−1. Furthermore, the prepared flexible Zn-ion battery (FZIB) with VCN-5 not only exhibited high specific capacitance (81 μAh cm−2), excellent rate capability, and long cyclic durability (77% after 1000 cycles at 0.6 mA cm−2) but also had the characteristics of flexibility. This FZIB is important to reduce the difficulty in thermal management and can be used in a series of applications, including wearable electric devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jinxin Li,Wenke Shao,Daohong Zhang,Qiufan Wang
Zinc-ion batteries (ZIBs) have attracted an increasing attention as a potential low-cost, environmentally friendliness, and high-safety energy storage system. Among them, transition metal vanadates with high oxidation state vanadium have great potential in ZIBs cathode research due to their high theoretical capacity. However, many vanadate particles still inevitably suffer from low ion mobility, low electrical conductivity and stability. Cation doping or compositing is an effective pathway capable of enhancing electrical conductivity. In this work, layered Cu-Fe 2 VO 4 porous nanorods are obtained by introducing Cu 2+ into MIL-88A(Fe) (a metal–organic framework; MIL stands for materials from Institute Lavoisier) and further ion-exchanged with NH 4 VO 3 , exhibiting excellent zinc storage properties as an cathode. The existence of oxygen vacancies and the change of electronic structure caused by Cu 2+ substituting part of Fe 2+ enhanced the conductivity and electron transfer rate. It delivers a reversible discharge capacity of 237 mAh/g at 0.3 A/g and a satisfactory high rate capacity of 126 mAh/g after 30 cycles at 5 A/g, and stable cycling performance (198 mAh/g after 1000 cycles at 1 A/g). Furthermore, the energy density can reached to 230.97 Wh kg −1 at 208.6 W kg −1 . The assembled quasi-solid-state ZIBs maintain a high capacitance retention of 75% after 8000 cycles at 1 A/g.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Bin Xiao,Bao Zhang,Jun-chao Zheng,Lin-bo Tang,Chang-sheng An,Zhen-jiang He,Hui Tong,Wan-jing Yu
VO 2 is considered as a promising anode material for lithium ion batteries , owing to its high theoretical capacity and fast ion-transfer rate. However, the development of VO 2 is hindered by the severe issues of poor electrical conductivity , large volume changes and low energy density . In this study, nano-micro structure VO 2 /CNTs spheres are well designed and successfully synthesized through a one-step solvothermal method, where the carbon nanotubes are inlayed throughout the whole microspheres . This unique structure enables carbon nanotubes to improve the ion and electron conductivity of VO 2 . Besides, it can achieve a high tap density (> 1.3 g cm 3 ) of VO 2 /CNTs electrode, which is higher than nanomaterials (< 1.0 g cm 3 ), and compatible with the current commercial anode materials. The Li + storage behavior of VO 2 /CNTs is studied systematically in the potential range 0.01–3.0 V, it can obtain a high reversible specific capacity of 537.6 mA h g −1 at the current density of 0.05 A g −1 . Furthermore, the lithium insertion/extraction reaction mechanism of nano-micro structure VO 2 /CNTs is clarified. The results demonstrate that the nano-micro structure relieves the volume changes during charge/discharge cycling. Therefore, it provides an insight to create functional materials with nano-micro structure for a wide range application.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Guansheng Ma,Yuhao Liu,Kaili Zhang,Guangyu Qin,Yuefeng Yan,Tao Zhang,Xiaoxiao Huang
The tunable energy gap and distinctive layered configuration of transition metal dichalcogenides (TMDs) has sparked considerable interest in their capabilities for electromagnetic wave absorption. As a significant TMD, vanadium selenide (VSe 2 ) is characterized by a superior electrical conductivity (1 × 10 −3 S/m) and an expanded interlayer distance, which are advantageous for electromagnetic wave absorption performance. Nevertheless, the current research on VSe 2 in electromagnetic wave absorption is relatively limited. In this study, flower-like VSe 2 and shape-tunable VSe 2 /reduced graphene oxide (rGO) composites were fabricated via a simple solvothermal method, and the effect of their morphology on electromagnetic wave absorption performances was investigated. The VSe 2 /rGO composites exhibited remarkable electromagnetic wave absorption properties at a thickness of 2.01 mm, with a reflection loss value (RL) of up to −79.50 dB, and an effective absorption bandwidth (EAB) of 5.2 GHz (1.45 mm). This research has identified a novel approach to the study of TMDs in the field of electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 14
·8521-8526
·
IF 10.733
Yuang Zhang,Malik Muhammad Umair,Xin Jin,Rongwen Lu,Shufen Zhang,Bingtao Tang
Solar thermoelectric generation (STEG) is an environmentally-friendly, safe, and economical technique that can be used for sustainable solar energy utilization. Efficient and stable STEG depends on strong light absorption and stable temperature difference. Herein, we constructed a new intelligent light-driven thermoelectric conversion system with VO2, polystyrene/Fe2O3-graphene nanosheets (PS/Fe2O3-GNS), and a thermoelectric module. The system can realize light-thermal-electric conversion and obtain a stable current owing to the infrared light transmittance switch of the VO2 film, high visible-light absorbing ability of PS/Fe2O3-GNS, and thermoelectric effect of the thermoelectric module. Furthermore, the new system can operate normally under sunlight, indicating the prospect of practical application.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qingqing Sun,Yan Lv,Xueyan Wu,Wei Jia,Jixi Guo,Fenglian Tong,Dianzeng Jia,Zhipeng Sun,Xingchao Wang
Vanadium nitride is highly desirable for their good electrochemical performance and wide work potential window, but they are cramped practical applications in supercapacitors due to poor cycling stability. Herein a combined strategy is exploited to fabricate coralloid-like nanostructure vanadium nitride/carbon (VN/C) via a facile hydrothermal method . The structural characterization displayed that nano-VN was uniformly distributed in the carbon scaffold materials to improve the electrode behavior. Those composites exhibited a wide voltage window of −1.1 to 0 V with a specific capacitance of 385 F g −1 at 1 A g −1 , and exceptional cycling stability (88.9% retention after 10000 cycles). The two-electrode system based on VN/C electrodes obtains a high energy density of 24.2 Wh kg −1 at a power density of 1050 W kg −1 . The device also shows perfect cycling stability with 93.3% capacitance retention after 10000 cycles. The coralloid-like VN/C electrode materials can be used in practical applications of the high-performance energy storage device.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Peng Ge,Shaohui Yuan,Wenqing Zhao,Limin Zhang,Yue Yang,Lingling Xie,Limin Zhu,Xiaoyu Cao,Xiaobo Ji
Captivated by their strong ion-storage capacities, vanadium (V)-based cathode materials have triggered plenty of active research. However, these materials still suffer from unstable lattice structures, always accompanied by inferior rate capabilities. Herein, with the introduction of bromine ions, the oriented growth was tailored to form smaller rod-like particles, while the resultant charge unbalance brought about the creation of oxygen defects, boosting the broadening of energy distribution with fast redox reactions. The as-targeted sample displayed a lithium ion storage capacity of 280 mA h g–1, which was still maintained at about 252 mA h g–1 after several cycles. As zinc-ion battery cathodes, a capacity of 247 mA h g–1 could be retained at 0.5 A g–1 after 100 cycles. Even at a high current density of 3.0 A g–1, the capacity was retained at about 207 mA h g–1 after 500 cycles. Supported by a series of advanced technologies, the enhanced redox activity of V ions was detected owing to the unbalance of charge from bromine doping. Moreover, a detailed kinetic analysis and in situ resistance measurements further demonstrated the enhancement of surface-controlling contributions and in-depth redox reactions. Given that, this work was anticipated to offer a significant perspective about rational surface-/interface-enhanced properties of advanced energy-storage materials.
研究领域:
能源存储材料
·
电化学
✓ 已验证
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Jing-Jing Lv,Zhe Li,Jiaju Fu,Wenlei Zhu
An electrochemical approach for ammonia production is successfully developed by coupling the anodic dinitrogen oxidation reaction (NOR) and cathodic hydrogen evolution reaction (HER) within a well-designed membraneless flow electrolyzer. The obtained reactor shows the preferential yield of ammonia over nitrogen oxides on the vanadium nitride catalyst surface. At an applied oxidation potential of 2.25 V versus the reversible hydrogen electrode (vs RHE), a promoted ammonia production rate and Faradaic efficiency (FE) were obtained with 9.9 mmol g −1 h −1 (0.029 mmol cm −2 h −1 ) and 4.8%, respectively. Besides, the negative affection of ammonia contamination is efficiently alleviated. Density functional theory calculations revealed that the thermodynamic energy needed to produce ammonia (−0.63 eV) is far lower than that of producing nitrogen oxide (0.96 eV) from hydrogenated nitrogen oxides [∗N 2 OH] splitting, confirming the coupling of NOR and HER.
研究领域:
电化学工程
·
催化科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shutao Zhang,Liang Chen,Daojie Dong,Yulin Kong,Jun Zhang,Junru Liu,Zhaoping Liu
In this work, five vanadium oxide materials with a series of pre-intercalated cations A (AmV2O5), including Zn2+, Mg2+, NH4+, Li+, and Ag+, have been successfully prepared by a two-step method. All of them possess binary monoclinic and orthorhombic V2O5 phases with an open layered structure that allows the ionic storage and diffusion of hydrated cations. The interlayer space for the monoclinic V2O5 phase is strongly dependent on the radii of hydrated cations A, while the one for the orthorhombic V2O5 phase remains the same regardless of the radii of cations A. Among them, AmV2O5 with pre-intercalated Zn2+ (ZVO) has the best storage ability of Zn2+ with a reversible capacity close to 400 mAh g–1, and AmV2O5 with pre-intercalated Ag+ shows the highest rate capacity with a nearly 40% capacity retention at a current of 20 A g–1 (≈25 C). Kinetic studies have clearly shown that pseudocapacitive behavior dominates the electrochemical reaction on ZVO. During the Zn2+ (de)intercalation reaction, a highly reversible transformation of binary monoclinic or orthorhombic V2O5 phases into a single triclinic ZnxV2O5·nH2O phase is demonstrated on ZVO. Vanadium atoms are identified as the redox centers that undergo the mutual transition among the chemical states of V3+, V4+, and V5+. They together with oxygen atoms constitute reasonable V–O coordination polyhedra to generate a layered structure with a suitable interlayer space for the insertion or removal of zinc ions. Actually, the intrinsic coordination chemistry changes between VO5 square pyramids and VO6 octahedra account for the phase transformation during the Zn2+-(de)intercalation reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yushi Guo,Ling Wu,Chenglin Jiang,Jinling Zhao,Lutian Feng,Kaiyue Zhang,Ye Qin,Xiangrong Li,Jianguo Liu,Chuanwei Yan,Jiazhen Yang,Na Wang,Duo Qi,Junyao Li,Ming Lei
A number of additives have been proven to improve the performance of vanadium redox flow batteries (VRFBs). Polyacrylic acid (PAA) is considered to be one of the promising candidates because of its beneficial effects on the stability of batteries . This paper studied the influence of PAA on viscosity, which is one of the electrolyte transport properties. The viscosity of VOSO 4 + PAA + H 2 O ternary solution was measured at different temperature, ionic strength , and ionic strength fractions in the temperature range of 283.15 K–318.15 K. Several thermodynamic parameters of the PAA aqueous solution were calculated, such as the viscosity B -coefficients, the apparent molar volume of infinite dilution and the free energy of activation . In addition, two different semi-empirical prediction equations were established for ternary solution viscosity on the basis of the Eyring's theory , and the better one was determined through comparison. The average relative deviation is 0.74% between the predicted and the experimental values, which indicates this function can be used to predict the viscosity of VOSO 4 + PAA + H 2 O ternary solution.
研究领域:
电化学
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）