Catalysts
·
2021
·Vol. 11
·期 4
·445
·
IF 4.146
Yangyang Guo,Xiaofei Xu,Hong Gao,Yang Zheng,Lei Luo,Tingyu Zhu
Ca poisoning behavior is inevitable for high-calcium content flue gas, so V2O5-WO3/TiO2(VWT) and V2O5-WO3-CeO2/TiO2(VWCeT) catalysts with different vanadium content have been prepared and the Ca-doped catalysts are compared in this manuscript. The result shows Ce addition can both promote the NO conversion and the alkali resistance. Lower Ca addition for 0.1VWCeT catalyst promotes its oxidability and Ce modification is more suitable for low vanadium catalysts. The total acidity and the reducibility of catalysts decline after Ca doping, and the reducibility of the active species on catalysts has been strengthened by Ce addition. CeO2based catalysts with lower Ca loading struggle to resist sulfur poisoning, while higher Ca loading favors SO2adsorption and also physically reduces the cerium acidification process. In the presence of SO2, additional Brønsted acid sites are formed in Ca rich catalyst. The dynamic NH3adsorption has been investigated, shows that Ca doping content on catalyst is critical for SCR reaction, and the catalyst is more susceptible to SO2initially in alkali flue gas during the actual application, but the sulfur resistance may increase with the alkali-poisoning effect aggravated by Ca doping.Keywords:Ca-poisoning;SCR reaction;NO reduction;V2O5-WO3/TiO2and V2O5-WO3-CeO2/TiO2catalysts;SO2and water;NO removal efficiency
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 40
·2003816
·
IF 11.459
Guolong Wang,Xiaoqian Cui,Jiamei Liu,Yaling Wang,Yide Qiao,Xiaowei Shi,Yan Zhang,Heguang Liu,Lei Li
Exploring new battery technologies will promote the advance of energy storage systems. Designing a symmetrical-structured rechargeable battery with the same electrode materials is a meaningful exploration for battery technology. Here, a solution-processed all-V 2 O 5 rechargeable battery with V 2 O 5 as both anode and cathode is presented, in which the anionic/cationic redox reactions are decoupled by precisely clamping its working potential windows. The battery shows good electrochemical performance with high capacity of 151 mAh g −1 at 0.10 C, good rate performance with 70% capacity retention when the current increases from 0.10 to 5 C, and promising cycling stability over 83% capacity retention after 900 cycles at 1 C. Moreover, the battery is highly profitable for simplified fabrication and scalable production, which benefits from its symmetrical configuration as well as the solution-processed strategy. This work offers a new paradigm to construct advanced symmetrical energy storage devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zheng Wang,Yong Fan,Yimin Zhang,Hong Liu,Peng Liu,Qian Wan
In the context of the accelerated development of all-vanadium liquid flow batteries and vanadium-based alloys, there is a growing requirement for high-purity V 2 O 5 . In this study, vanadium shale leachate was used as raw material and V 2 O 5 products with purity >99.9 % were prepared greenly and efficiently through vanadium precipitation by melamine adsorption, and the adsorption conditions and mechanisms were investigated. XPS, FTIR, DFT, and MD results show that the –NH 2 and N atoms on the melamine bind to VO 2 + through coordination, resulting in high adsorption performance. The Langmuir isothermal adsorption model predicted the maximum adsorption capacity of melamine for vanadium to be 892.86 mg/g. Furthermore, the adsorption thermodynamics indicated that the adsorption reaction was heat-absorbing and spontaneous. The pseudo-second-order kinetic model provided a superior description of the adsorption kinetic data at 363 K, and the adsorption process was found to be mainly controlled by the chemical reaction control kinetic model. The reaction conditions were optimized by response surface methodology, and under the optimized conditions, the vanadium precipitation rate was >99 %, the purity of the prepared V 2 O 5 was >99.9 %, and the vanadium precipitation process did not produce ammonia–nitrogen wastewater. The method provides an efficient, economical, and environmentally friendly way for the preparation of high-purity V 2 O 5 .
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Hongying Liu,Xiaoping Liang,Tao Jiang,Yuanyang Zhang,Shiwei Liu,Xuezhuang Wang,Xiaowei Fan,Xuguo Huai,Yadong Fu,Zhenbo Geng,Dequan Zhang
Nanoscale V 2 O 5 films possess excellent electrochemical properties and have great potential for application in electrochromic devices. Herein, we report a novel strategy for the transformation of three-dimensionally ordered macroporous(3DOM) V 2 O 5 films into V 2 O 5 nanorods film using a simple low-temperature annealing treatment, in which the heterogeneous nucleation sites provided by PS colloidal sphere surface, the anisotropic bonding of V 2 O 5 , atomic rearrangement, and Ostwald ripening are all important factors affecting the morphological transformation. According to this study, during the preparation of 3DOM V 2 O 5 films, a small number of oxygen vacancies were introduced into the V 2 O 5 lattice, and the annealing treatment (250–400 °C, 4–8 h) controlled the concentration of oxygen vacancies. Compared with the ion storage capacity of V 2 O 5 films prepared by conventional sol-gel dip-coating method (17.79 mC cm −2 for unannealed V 2 O 5 films and 13.90 mC cm −2 for V 2 O 5 films after 6 h of annealing at 350 °C), the 350°C-6h films with nanorod structure had the highest ion-storage performance, the initial value raised to 98.77 mC cm −2 . Further, the cycling stability was excellent, with only a 6.1% decrease after 5000 cycles. This was because of the special nanorod structure and the presence of a certain number of gradient oxygen vacancies in the 350°C-6h film. The 350°C-6h film also had good electrochromic properties, a wide range of transmittance modulation (73.6%), and a fast response time (3.2 s for coloring and 3.9 s for bleaching). In addition, electrochromic devices (ECDs) with 350°C-6h films as both ion-storage layers and electrochromic layers have been successfully assembled, which exhibit high performance.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale Horizons
·
2022
·Vol. 8
·期 3
·338-345
·
IF 11.684
Jie Wu,Xuetao Qin,Yu Xia,Yuanyuan Zhang,Bin Zhang,Yunchen Du,Hsing-Lin Wang,Siwei Li,Ping Xu
Transition metal sulfides (TMSs) are promising electrocatalysts for hydrogen evolution reaction (HER), while TMSs usually suffer from inevitable surface oxidation in air, and the impact of the surface oxidation on their HER catalytic activity remains unclear. Herein, we demonstrate an effective strategy for reducing the surface oxidation degree of easily oxidized CoS2 by introducing glued vanadium pentoxide (V2O5) nanoclusters, taking advantage of the preferential adsorption and strong interaction between high-valence V and O2. Combining oxidation protection and elaborate oxidation control experiments reveal that reduced surface oxidation degree of CoS2 is conducive to affording promising HER catalytic performance, as the oxidized surface of CoS2 can hinder the dissociation of water and thus is harmful to the HER process. Direct evidence is provided that surface oxidation should be carefully considered for TMS-based HER catalysts. The present work not only develops a new strategy for protecting CoS2 from surface oxidation, but also provides deep insight into the impact of surface oxidation on the HER performance of transition metal compounds.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 23
·1-12
·
IF 2.8
Li Jishun,Liang Fangan,Zhong Shenglin,Zhang Shuchao,Zou Zhengguang,Li Yanwei,Le Shangwang
V 2 O 5 , as a potential cathode material for lithium-ion batteries (LIBs), is limited by poor activity and structural stability. Herein, a series of 3D shuttle V 2 O 5 materials are obtained by a simple solvothermal method combined with subsequent calcination. When the calcination temperature was set to 600°C, the obtained V 2 O 5 porous material (V-MOFs-600) had the largest specific surface area and pore volume, which conferred more Li + embedding sites and thus accelerated Li+ embedding/de-embedding. Based on this, paired with a lithium anode, the V-MOFs-600 cathode exhibits excellent lithium storage performance parameters of 162.1 mAh·g -1 at 1A·g -1 and 78.3% capacity retention after 200 cycles. These results indicate that the 3D shuttle V 2 O 5 porous nanoelectrode materials assembled from particles are highly promising as long-life, high-rate cathode materials for next-generation LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2022
·Vol. 12
·期 5
·
IF 1.697
Li Miao,Ai Taotao,Kou Lingjiang,Song Jiajia,Bao Weiwei,Wang Yong,Wei Xueling,Li Wenhu,Deng Zhifeng,Zou Xiangyu,Wang Huhu
Electrode materials are the key to the electrochemical performance of supercapacitors. This study reports the electrochemical properties of V 2 O 5 supercapacitors. V 2 O 5 nanosheets with different morphologies were prepared by controlling the solvent under a facile hydrothermal method. The phase and the morphology of the samples were characterized by x-ray diffraction and scanning electron microscopy. The electrochemical properties of V 2 O 5 nanosheets with different morphologies were studied by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The charge transfers resistance decreases from 3.2 Ω of V 2 O 5 particles to 2.0 Ω of V 2 O 5 nanosheets. V 2 O 5 nanosheets exhibit higher specific capacity (375 F g −1 ) than V 2 O 5 particles (318 F g −1 ) in K 2 SO 4 solution. The cycling capacity retention keeps 96.8% for 1000 cycles at 0.5 A g −1 in K 2 SO 4 solution, indicating better cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2016
·Vol. 16
·期 4
·584
·
IF 2.033
Jiaheng Sun,Chunyan Li,Yanfei Qi,Shuanli Guo,Xue Liang
Nanozyme-based chemical sensing is a rapidly emerging field of research. Herein, a simple colorimetric assay for the detection of hydrogen peroxide and glucose based on the peroxidase-like activity of V2O5nanozymes has been established. In this assay, the effects of pH, substrate, nanozyme concentrations and buffer solution have been investigated. It was found that compared with 3,3′,5,5′-tetramethylbenzidine (TMB), the enzyme substrateo-phenylenediamine (OPD) seriously interfered with the H2O2detection. Under the optimal reaction conditions, the resulting sensor displayed a good response to H2O2with a linear range of 1 to 500 μM, and a detection limit of 1 μM at a signal-to-noise ratio of 3. A linear correlation was established between absorbance intensity and concentration of glucose from 10 to 2000 μM, with a detection limit of 10 μM. The current work presents a simple, cheap, more convenient, sensitive, and easy handling colorimetric assay.Keywords:V2O5nanozymes;variation;substrates;H2O2;glucose
研究领域:
生物化学
·
医学检测
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2019
·
IF 2.739
Shareen Shafique,Shuming Yang,Yonas Tesfaye Woldu,Yiming Wang
In this paper, we synthesized hierarchical urchin-like V 2 O 5 hollow spheres by simple, low cost and one-pot hydrothermal method without using any kind of templates and surfactants. The X-ray diffraction analysis indicated the urchin-like V 2 O 5 hollow spheres exhibited orthorhombic crystal structure. The field emission scanning electron microscope and high-resolution transmission electron microscope demonstrate that the morphology is urchin-like hollow spheres with an average diameter is about (3–4 μm). Time-dependent experiments were performed to investigate the plausible mechanism for the formation of hierarchical urchin-like V 2 O 5 hollow spheres through Ostwald ripening. And then, these urchin-like hollow spheres were used to fabricate the photodetector for the high-performance key parameters. The critical parameters such as photosensitivity, responsivity and specific detectivity were calculated 2.79 × 10 2 , 1.109 AW −1 , 1.525 × 10 11 Jones, respectively, under 41.3 mWcm -2 of 450 nm laser at an applied bias of −5 V. The urchin-like V 2 O 5 hollow spheres show excellent photodetection properties upon illumination, because of the cumulative effect of the primary building blocks of nanorods and proper hollow structure that enhance the resultant excellent device performance. Overall, this photodetector offers extraordinary potential and pave the way for an effective approach to fabricate next-generation optoelectronic and electronic devices.
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Qitong Xue,Jiaying Xing,Jianjun Chen,Jinxing Mi,Jianqiang Shi,Yao Wang,Junhua Li,Zhiming Liu
V 2 O 5 /TiO 2 has been wide used in the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR). However, the poisoning mechanism of thallium (Tl) on the catalytic performance of commercial V 2 O 5 /TiO 2 catalyst has remained unclear. Herein, we have systematically investigated the poisoning effect of Tl based on the different characterizations and DFT calculations. It was found that the strong interaction between V and Tl exists, resulting in the transformation of V from monomeric VO x to polymeric and crystalline VO x , the formation of V-O-Tl species, a decrease in the active V 5+ sites, and the inhibition of the adsorption and activation of NH 3 on both Brønsted and Lewis acid sites. Mechanistic studies further confirmed that inactive nitrate intermediate species gradually accumulated over V 2 O 5 /TiO 2 catalyst surface due to the presence of Tl. A combination of factors ultimately led to the deactivation of the V 2 O 5 /TiO 2 catalyst. This study unveils the poisoning mechanism of Tl on V-based catalysts and shed light on the design of Tl-tolerant NH 3 -SCR catalysts.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 20
·1-11
·
IF 2.8
Wang Yunjie,Liang Fangan,Zou Zhengguang,Zhang Shuchao,Jia Shengkun,Nong Jinxia,Zheng Rong,Song Lijie
Among the cathode materials for lithium-ion batteries (LIBs), vanadium oxides have received extensive attention from researchers due to their abundant reserves and high theoretical specific capacity. Nevertheless, its low electronic conductivity and poor structural stability lead to its poor electrochemical performance. Herein, the V 2 O 5 layered nanofibers prepared by electrostatic spinning technique combined with annealing processes. When the calcination temperature was set to 450 °C, the obtained V 2 O 5 layered nanofiber material (AM450-V 2 O 5 ) had a uniformly dispersed morphology, which conferred more lithium ion insertion sites and thus accelerated lithium ion insertion/(de)insertion. Based on this, the AM450-V 2 O 5 electrode exhibits a high initial discharge specific capacity (250.7 mAh/g at 0.1 A/g) and excellent cycling stability (82% cycle retention at 1 A/g after 150 cycles). These results indicate that the V 2 O 5 layered nanofibers are highly promising as long-life, high-rate cathode materials for next-generation LIBs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2020
·Vol. 6
·期 5
·797-805
·
IF 3.384
Yu Hao,Shumin Zhang,Peng Tao,Tong Shen,Zijie Huang,Jingkai Yan,Yu Chen
Graphical A controllable amount of K + has been intercalated into V 2 O 5 layers to form stable K−O bonds between the V 2 O 5 layers, which works as the “pillar” to greatly enhance its structural stability. The“pillar effect”of the K−O bond can effectively inhibit the dissolution of vanadium-based oxides in the aqueous electrolyte, being crucial to the electrochemical performance of aqueous ZIBs. Aqueous zinc-ion batteries (ZIBs) have attracted widespread attention due to their advantages in safety and environmental benignity. However, achieving a cathode material with stable electrochemical performance for such a system remains an ongoing challenge. Herein, a K 0.5 V 2 O 5 cathode has been designed and synthesized by intercalating of K + into V 2 O 5 , thus constructing a stable crystal structure by forming chemical bonds between V 2 O 5 layers. The successful intercalation of K + has been confirmed by a series of experimental tests and Vienna Ab-initio Simulation Package simulation. These layer-interlinking chemical bonds act as “pillars” to strongly hold the V 2 O 5 layers together and protect them from dissolution. Furthermore, the K 0.5 V 2 O 5 electrode also exhibits excellent durability (about 150 mA h g −1 at 5 A g −1 after 3000 cycles). More impressively, even after standing for three days in the solution of 3 M ZnSO 4 electrolyte, the K 0.5 V 2 O 5 electrode still maintains a high capacity of 92.2 mA h g −1 after 150 cycles, demonstrating its outstanding stability and tolerance in such aqueous electrolyte.
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）