CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhenni Ding,Zilin Li,Yanhui Cao,Kaifeng Chen,Haiyan Zhuang,Jingjing Wang,Congshu Huang,Chi Ma,Dajiang Zheng
By depositing V 2 O 5 on precursor co-CoNi films with MnO 2 pretreatment layer using cyclic voltammetry (CV), a ternary electrochromic (EC) film with high performance and multicolor characteristic was obtained in this work. Compared with binary electrochromic film with deposition of V 2 O 5 on CoNi hydroxide films directly, the introduction of MnO 2 enhanced the cyclic stability significantly through formation of a more compact micro morphology and appearance of more active sites in this case. In addition, the ternary film presents higher optical modulation, less response time, higher coloring efficiency, better color memory ability, larger color range and faster electrochemical kinetics. The excellent electrochromic performance of the obtained film makes it possible to manufacture multicolor transparent EC devices, and demonstrates a promising application prospect in related fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
You Mengyun,Wu Shufeng,Feng Xiaotong,Zhao Yong,Wang Yubin,Zhang Zhang
The enhancement effect of Ce modification on V 2 O 5 -WO 3 /TiO 2 catalysts at low temperatures was investigated for the selective catalytic reduction (SCR) of NO x with NH 3 (NH 3 -SCR). By adding 9% CeO 2 to 0.5%V 2 O 5 -3%WO 3 /TiO 2 catalyst, the low-temperature denitrification performance of Ce 9 V 0.5 W 3 Ti catalyst after Ce modification was significantly improved, achieving a NO conversion above 90% within a broad temperature range of 200–350℃, with catalytic activity comparable to that of 3% V 2 O 5 -3% WO 3 /TiO 2 . The catalysts were characterized by XPS, H 2 -TPR, NH 3 , and NO-TPD. The results indicated that the Ce additive could enhance the adsorption of NO x on Ce 9 V 0.5 W 3 Ti catalyst due to the synergetic interaction among the Ce and V, W species. The interaction between V and Ce also promoted the formation of V 5+ and Ce 3+ on the surface of the catalyst, which was conducive to enhancing the adsorption and oxidation capacity of the catalyst for NO. Additionally, the introduction of Ce led to a substantial deposition of nitrate species on the surface of the catalyst, especially the increase of nitrite species, which was beneficial to the NH 3 -SCR reaction process, resulting in a significant enhancement of the catalyst’s low-temperature catalytic activity.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Donghua Jia,Feng Zheng,Yaxuan Li,Yingying Niu,Yue Yang,Xiaodong Mao,Qiang Zhen,Peng Li,Yi Yu
In this work, two-dimensional V 2 O 5 nanosheet arrays/one-dimensional Co 3 O 4 nanoneedle arrays (2D VNSAs/1D CNNAs) composite is successfully prepared on nickel foam substrate. A variety of structural characterization techniques (SEM, XRD, EDS, TEM, and XPS) show that the as-prepared composite is V 2 O 5 monocrystal with a layered structure grafting by Co 3 O 4 polycrystal with a 1D needle-like structure. The VNSAs/CNNAs composite is used as supercapacitor electrode material. In a three-electrodes system, it shows high specific capacitance (C s ) values (1023 F g −1 @5 mV s −1 from CV curve and 826 F g −1 @0.5 A/g from GCD curve), a high coulombic efficiency (98.6 %@10 A/g), a good cyclic stability (92.7 % after 6000 cycles), a low charge transfer resistance (2.7 Ω), and a fast ionic diffusion rate (2.01 × 10 −8 cm 2 s −1 ). In a two-electrodes system, the assembled VNSAs/CNNAs//VNSAs/CNNAs symmetric supercapacitor has C s values of 445 F g −1 @5 mV s −1 and 363 F g −1 @0.5 A/g. Its cycle stability and rate capability could reach up to 92.3 % and 90.7 % after 6000 cycels, respectively. It also shows a high energy density (E d ) of 127.3 Wh kg −1 @400 W kg −1 and can retain 72.2 Wh kg −1 @8000 W kg −1 . The excellent electrochemical properties indicate that VNSAs/CNNAs composite can greatly increase the E d of supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 31
·1900909
·
IF 24.884
Chengrui Wang,Lei Zhang,Mohammad Al-Mamun,Yuhai Dou,Porun Liu,Dawei Su,Guoxiu Wang,Shanqing Zhang,Dan Wang,Huijun Zhao
The symmetric batteries with an electrode material possessing dual cathodic and anodic properties are regarded as an ideal battery configuration because of their distinctive advantages over the asymmetric batteries in terms of fabrication process, cost, and safety concerns. However, the development of high-performance symmetric batteries is highly challenging due to the limited availability of suitable symmetric electrode materials with such properties of highly reversible capacity. Herein, a triple-hollow-shell structured V 2 O 5 (THS-V 2 O 5 ) symmetric electrode material with a reversible capacity of >400 mAh g −1 between 1.5 and 4.0 V and >600 mAh g −1 between 0.1 and 3.0 V, respectively, when used as the cathode and anode, is reported. The THS-V 2 O 5 electrodes assembled symmetric full lithium-ion battery (LIB) exhibits a reversible capacity of ≈290 mAh g −1 between 2 and 4.0 V, the best performed symmetric energy storage systems reported to date. The unique triple-shell structured electrode makes the symmetric LIB possessing very high initial coulombic efficiency (94.2%), outstanding cycling stability (with 94% capacity retained after 1000 cycles), and excellent rate performance (over 140 mAh g −1 at 1000 mA g −1 ). The demonstrated approach in this work leaps forward the symmetric LIB performance and paves a way to develop high-performance symmetric battery electrode materials.
研究领域:
材料科学
·
能源存储技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 16
·A3738
·
IF 3.662
Bingbing Hu,Qin Xiang,Yuan Cen,Sha Li,Lijun Liu,Danmei Yu,Changguo Chen
In this work, uniform wrinkle V2O5@GO flexible thin films have been successfully synthesized via a facile drop-casting and annealing process from the composite sol-gel. It is found that VG8 composite thin film with an appropriate mass ratio (8:1) of V2O5 and GO shows an outstanding specific capacitance of 397 F g−1 at a current density of 1 A g−1, high-class rate capability (77%) and good cycling stability with 98% capacitance retention over 2000 cycles at a current density of 5 A g−1, which is much superior than pure V2O5 thin film electrode. A full solid-state symmetric energy storage device is assembled using the VG8 composite thin film, exhibiting high energy density of 17.66 Wh kg−1 at a power density of 249.9 W kg−1, as well as excellent cycling stability (89.3% capacitance retention after 5000 cycles). Impressively, three charged device in series can light up a yellow light emitting diodes (LEDs), demonstrating its potential in futher energy storage applications.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lizhen Li,Junbin Sun,Weihong Lu,Zhifeng Xu
Six multi-component rare earth phosphate materials were prepared by chemical co-precipitation, which are (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )PO 4 , (La 0 · 2 Ce 0.2 Nd 0.2 Sm 0.2 Eu 0.2 )PO 4 , (Ce 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )PO 4 , (La 0.5 Nd 0.5 )PO 4 , (La 0.5 Gd 0.5 )PO 4 and (Nd 0.5 Gd 0.5 )PO 4 . Hot corrosion behavior tests were conducted in molten V 2 O 5 salt at 900 °C and 1000 °C for 20 h and 40 h, respectively. The results show that the corrosion temperature and the heat treatment time have little effect on the type of corrosion products . Among these materials prepared in this study, the material containing Gd element and the material without Gd element exhibit different hot corrosion behavior . For the multi-component rare earth phosphate materials containing Gd element, the corrosion product is ReVO 4 (Re Sm, Eu, Gd) xenotime, and a reaction layer is formed on the surface of the bulk. For the multi-component rare earth phosphate materials without Gd element, the corrosion product is Re(P,V)O 4 (Re La, Ce, Nd) solid solution and the amount of product is very small, the corrosion reaction is extremely weak and no reaction layer is formed. Although the molten salt mainly penetrates, the original structure of the bulk has not been damaged, which indicates that its hot corrosion resistance is good. The hot corrosion mechanisms of these six multi-component rare earth phosphates are studied based on the crystallographic characteristics of rare earth phosphates/vanadates.
研究领域:
材料科学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanli Zhang,Jian Li,Jianyu Cai,Shuangye Li,Xing Fan,Liyun Song,Ruixue Guo,Jiasheng Liu
In this study, a series of γ-Fe 2 O 3 -modified V 2 O 5 -MoO 3 /TiO 2 (VMT) catalysts was prepared by wet impregnation method. The γ-Fe 2 O 3 -modified catalysts exhibited excellent catalytic performance, and 1.25 wt% γ-Fe 2 O 3 content improved the deNO x efficiency at 150 °C from 54% (unmodified VMT catalyst) to 84% (modified catalyst). BET, XRD, XPS, NH 3 -TPD, H 2 -TPR, and in situ DRIFTs were employed to characterize the physicochemical properties and reaction mechanisms of the catalysts. The introduction of γ-Fe 2 O 3 increased the V 5+ /V 4+ ratio, surface chemisorbed oxygen content, redox ability, and a number of acid sites in the prepared catalysts. XPS confirmed the addition of γ-Fe 2 O 3 introduced new charge transfer pathways (Fe 3+ /Fe 2+ ↔ V 5+ /V 4+ ). In situ DRIFTs suggested that the addition of γ-Fe 2 O 3 to the catalyst significantly increased the adsorption capacity of catalyst for NH 3 and NO x , while also exerting a strong activating effect on the adsorbed NH 3 . Furthermore, selective catalytic reduction over the VMT and 5PEG@1.25Fe-VMT catalysts followed the Eley-Rideal (E-R) mechanism. At temperatures above 200 °C, the 5PEG@1.25Fe-VMT catalyst also followed the Langmuir-Hinshelwood (L-H) mechanism.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Li Huang,Yiqing Zeng,Yibo Gao,Hu Wang,Yuhao Zong,Zhengfeng Chang,Shule Zhang,Pei Han,Yang Yu
The oxidation of SO 2 into SO 3 promote the formation of NH 4 HSO 4 (ABS), which can cover surface active sites catalyst, and then leading to the decrease of NH 3 -SCR De-NO x activity. In this work, phosphorus species were loaded on the V 2 O 5 -MoO 3 /TiO 2 De-NO x catalyst to enhance its SO 2 resistance via inhibiting the SO 2 /SO 3 conversion. XRD and N 2 -adsorption results showed that phosphorus has little impact on the structure and pore property of the catalyst. The results of XPS , H 2 -TPR, and NH 3 -TPD analyses illustrated that suitable amount of phosphorus (1%) increases the content of polymeric vanadate and chemisorbed oxygen (O α ) of the catalyst, which is benefit to the SCR process. Phosphorus species decreases the SO 2 absorbability and SO 2 oxidation activity of V-Mo-P/Ti catalysts, thus it exhibits higher NH 3 -SCR activity than that of the P-free catalyst at presence of SO 2 due to the lower SO 2 /SO 3 conversion and fewer amount of NH 4 HSO 4 deposition.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Wei Li,Xuesen Du,Zhi Li,Yaqin Tao,Jingyu Xue,Yanrong Chen,Zhongqing Yang,Jingyu Ran,Vladislav Rac,Vesna Rakić
Vanadia-based catalysts are widely used in selective catalytic reduction (SCR) reaction for reducing nitrogen oxides emissions, however, they only exhibit sufficient DeNO x efficiency within a narrow temperature window. In this study, a catalyst embedded with electrothermal alloy was prepared. The catalyst surface temperature could be heated using the electrothermal alloy, in order to widen the operating temperature window of the V 2 O 5 -WO 3 /TiO 2 catalyst. Experimental results revealed that the electrothermal alloy embedded V 2 O 5 -WO 3 /TiO 2 catalyst can maintain superior NH 3 -SCR performance and high resistance to H 2 O in a wide gas temperature range of 100–400 °C by controlling the surface temperature. In the meantime, the NH 4 HSO 4 poisoned catalyst could be efficiently regenerated through electric heating, and NO x conversion can be restored to the level of fresh samples. Additionally, the effect of additives including methylcellulose and glass fiber , on the physicochemical properties of the plate-type catalyst was also investigated, and the catalyst samples were characterized by means of BET, XRD , NH 3 -TPD, H 2 -TPR, TG and SEM-EDS. This study proves the electric heating strategy is a promising way to enhance the performance of the V 2 O 5 -WO 3 /TiO 2 during wide temperature SCR applications.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Rongrui Deng,Zhongting Wang,Shuangshuang Tan,Xueting Huang,Zhipeng Gao,Yongheng Fang,Chunfeng Chen,Ronghua Wang,Chaohe Xu,Guangsheng Huang,Jingfeng Wang,Fusheng Pan
Magnesium ion batteries (MIBs) hold immense potential for large-scale energy storage applications. However, serious polarization and sluggish reaction/diffusion kinetics resulting from high charge density of bivalent Mg 2+ significantly impeded the advancement of high-performance MIB cathodes. In this study, a coupling strategy of interlayer expansion and anionic vacancies is introduced into the cathode design of MIBs via PAN (polyacrylonitrile) intercalation, which can greatly enlarge the interlayer spacing of V 2 O 5 while induce cation reduction and generates abundant anion vacancies by facilitating electron transfer, thus expediting ion diffusion and electron transfer kinetics as demonstrated via combined GITT, EIS and CV analysis. Moreover, the PAN intercalation also endowed the electrode with ideal structural stability and electrochemical reversibility as proved via the systematic ex-situ investigations. Benefitting from this comprehensive strategy, PAN intercalated V 2 O 5 (V 2 O 5 -PAN) achieves remarkable electrochemical performance: a high discharge specific capacity of ∼ 180 mAh g −1 at 50 mA g −1 after stabilization, and an impressive life-span of 18,000 cycles at 2 A g −1 . This methodology offers valuable insights into enhancing the electrode kinetics performance of MIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Xianhong Zheng,Jinhao Tang,Binbin Ding,Wentao Cao,Zhi Liu,Xu Han,Hao Jia
Flexible yarn-shaped batteries are promising candidates for the wearable electronics owing to their good flexibility, tiny volume, compatibility with textiles. However, their practical applications are hindered by low capacity, active material mass loading, and energy density . Herein, we develop a coaxially wrapping strategy to fabricate an advanced yarn-shaped aqueous zinc-ion batteries (AZIBs) incorporating core-sheath carbon nanotube (CNT)/V 2 O 5 ·nH 2 O composite yarns as cathodes and zinc wire as anodes. The as-wrapped CNT intermediate layer not only enhances the surface's conductivity, but the nano-array porous layer can also accelerate the mixing of ion concentration between the electrode surface and the electrolyte fluid through the turbulence effect, thereby improving the interfacial ion/electron kinetics. As a result, the energy storage mechanism of CNT/V 2 O 5 ·nH 2 O yarn AZIBs transformed from capacitive-dominant to diffusion-controlled process, and the batteries demonstrate exceptional discharge capacity of 566.7 mAh g −1 at 0.1 A g −1 , surpassing the state-of-art yarn-based AZIBs and approaching the theoretical zinc storage capacity (589 mAh g −1 ). In addition, they exhibit a high energy density of 471 Wh kg −1 at 25.5 W kg −1 and excellent cycling performance. This work opens a new and efficient avenue for the structure design of high-performance electrode materials for flexible yarn-based batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Guopeng Yang,Qinggang Li,Guiqing Zhang,Mingyu Wang,Zuoying Cao,Wenjuan Guan,Jiawei Du,Shengxi Wu
Traditional vanadium extraction process, which involves H 2 SO 4 stripping after solvent extraction followed by ammonium vanadate precipitation, faced the issues of large amount of reagent consumption and discharge of ammonia contaminated wastewater. Hydrogen peroxide stripping and precipitation of vanadium products by heating process was considered as a novel alternative for H 2 SO 4 stripping - ammonium vanadate precipitation route due to the ammonia-free wastewater and high efficiency. However, it was found that the V stripping efficiency was in the range of 54.9% ∼ 97.7% during the pilot test of 3-stage counter-current stripping, which was extremely unstable, as the high stripping efficiency (>95%) could only be achieved in a very short operation time (within 30 s). To solve these issues, the ion species transformation and the stripping mechanism of V with H 2 O 2 were systematically investigated. In this study, experimental results demonstrated that re-extraction led to a decrease of stripping efficiency. The use of D2EHPA alone without TBP as a modifier had a clear effect on prolonging the duration of maximum stripping efficiency at the optimal conditions so that the continuous operation of the pilot test was possible. The optimal stripping conditions were a molar ratio of H 2 O 2 :V of 4:1, phase ratio (O/A) of 3:1, temperature of 20 °C，stripping time of 8 min and the operation time of 3 min which resulted a ∼ 98% V stripping efficiency. In addition, the precipitation of vanadium products by heating, proposed in this work was a cleaner and more efficient V precipitation procedure that didn't require any reagents and produced no wastewater. Eventually, heating the strip liquor at 100 °C for 1 h resulted a precipitation efficiency of 96% V. The intermediate precipitated products (V 5 O 12 ∙6H 2 O and V 10 O 24 ∙12H 2 O) were roasted to obtain V 2 O 5 with a purity of >99%. Finally, the new process saves 885.2 $/t V 2 O 5 compared with the traditional process according to the cost analysis. The research results provide an efficient, clean and economical process for recovering V 2 O 5 from titanium-white waste.
研究领域:
冶金工程
·
环境工程
✓ 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）