INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Baitong Niu,Meihua Zhu,Hongxu Guo,Shaoming Ying,Xuguang Huang
A hexagonal prisms with hexagonal pyramid tips metal–organic frameworks (MOFs) modified V 2 O 5 nanoparticles , V 2 O 5 @MOF(V, Co) has been fabricated through a simple one-pot hydrothermal reaction and then characterized by XRD, FT-IR, FE-SEM, TEM, XPS and BET. The as-prepared V 2 O 5 @MOF(V, Co) composites were found to be an excellent electrode modification material for electrochemical detection of Pb 2+ in aqueous solution. Operational parameters such as pH, deposition potential, and deposition time, were also optimized to detect trace amounts of Pb 2+ . This study provides a feasible research method and practical strategy for sensitive and sensitive on-line detection of lead ions using novel MOFs composites.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
YaHui Cai,ShuYi Ma,TingTing Yang,Li Wang,Ni Na Ma,Miao Miao Liu
The pure YVO 4 and heterostructured YVO 4 /V 2 O 5 gas sensitive materials were prepared by simple and economic hydrothermal path. A variety of characterization methods were used to study the morphology, specific surface area and binding state of YVO 4 /V 2 O 5 composites. The results show that the YVO 4 /V 2 O 5 composites has smaller particle size (reduced from 200 nm to 50 nm) and larger specific surface area, which is increased from 7.738 m 2 /g to 26.586 m 2 /g). Compared with pure YVO 4 , the n-type sensor based on YVO 4 /V 2 O 5 composites has higher response value (increased from 12.29 to 42.15), lower optimal operating temperature (reduced from 200 °C to 140 °C), and shorter response/recovery time (reduced from 11 s/25 s–6 s/14 s). The YVO 4 /V 2 O 5 composites gas sensor has excellent selectivity and good long-term stability for triethylamine gas. The study of gas sensing mechanism shows that n-n heterojunctions and large specific surface area conduce excellent gas-sensitive property of YVO 4 /V 2 O 5 composites. This work provides a valuable direction for low-cost preparation of TEA sensors with excellent performance and long-term stability.
研究领域:
材料科学
·
化学传感器
·
气体传感技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 18
·2312982
·
IF 27.4
Yang Liu,Chengjie Lu,Yunting Yang,Wenshu Chen,Fei Ye,Hongliang Dong,Yuping Wu,Renzhi Ma,Linfeng Hu
Nanoconfinement of cations in layered oxide cathode is an important approach to realize advanced zinc ion storage performance. However, thus far, the conventional hydrothermal/solvothermal route for this nanoconfinement has been restricted to its uncontrollable phase structure and the difficulty on the multiple cation co-confinement simultaneously. Herein, this work reports a general, supramolecular self-assembly of ultrathin V 2 O 5 nanosheets using various unitary cations including Na + , K + , Mg 2+ , Ca 2+ , Zn 2+ , Al 3+ , NH 4 + , and multiple cations (NH 4 + + Na + , NH 4 + + Na + + Ca 2+ , NH 4 + + Na + + Ca 2+ +Mg 2+ ). The unitary cation confinement results in a remarkable increase in the specific capacity and Zn-ion diffusion kinetics, and the multiple cation confinement gives rise to superior structural and cycling stability by multiple cation synergetic pillaring effect. The optimized diffusion coefficient of Zn-ion (7.5 × 10 −8 cm 2 s −1 ) in this assembly series surpasses most of the V-based cathodes reported up to date. The work develops a novel multiple-cations nanoconfinement strategy toward high-performance cathode for aqueous battery. It also provides new insights into the guest cation regulation of zinc-ion diffusion kinetics through a general, supramolecular assembly pathway.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hongying Liu,Xiaoping Liang,Tao Jiang,Yuanyang Zhang,Shiwei Liu,Xuezhuang Wang,Xiaowei Fan,Xuguo Huai,Yadong Fu,Zhenbo Geng,Dequan Zhang
The advancement of efficient ion storage film is a formidable challenge. A kind of self-doped V 4+ -V 2 O 5 ion storage nanofilm on ITO-coating glass substrate is prepared in situ by a novel hydrothermal-assisted sol-gel composite method, which is without seed layers of hydrothermal process and additives of traditional sol-gel method. There are two important factors for the growth of V 2 O 5 nanofilm, that is, heterogeneous nucleation during hydrothermal method and the electrostatic attraction between V 2 O 5 sol and ITO substrate. A small amount of oxygen vacancies are introduced into V 2 O 5 lattice during the hydrothermal process, and the oxygen vacancy concentration is controlled by annealing treatment (200∼400 °C), which significantly improve the storage capacity and Li + diffusion. The excellent cycling performance of 300 °C-V 2 O 5 nanofilm is attributed to the synergistic effect of the gradient oxygen vacancies and the good bonding force between the film and the substrate. Comparing with the ion storage capacity of V 2 O 5 film prepared by traditional sol-gel method with the same annealing treatment (17.88 mC cm −2 ) and V 2 O 5 film without annealing treatment (17.79 mC cm −2 ), 300 °C-V 2 O 5 film has the highest ion storage performance, whose initial value of ion storage is up to 112.25 mC cm −2 and cycling stability is excellent with only a 2.4% decrease after 2000 cycles. The electrochromic device (ECD) with 300 °C-V 2 O 5 nanofilm as ion storage layer and WO 3 as the electrochromic layer has been successfully assembled, which shows fascinating performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Industrial Chemistry & Materials
·
2025
·
IF 11.9
Yan-Chao Qu,Guangyue Xu,Chen Chen,Jianhua Guo,Dingjia Liu,Haiwei Jia,Haonan Guo,Shuya Jia,Jiazhen Jia,Ying Zhang,Lifeng Yan
The development of novel low-temperature selective catalytic reduction (SCR) denitrification catalysts is a crucial research direction for reducing pollution and carbon emissions. Although V2O5-MoO3/TiO2 catalysts have been widely used in commercial applications, achieving effective SCR denitrification for low-temperature flue gases remains a significant challenge. In this study, the catalytic efficiency of the catalysts was systematically investigated and optimized by constructing Pearson linear correlation coefficient models between catalytic activity and different pore structures, substrate crystal planes, and active site components and properties, etc. Through comprehensive characterizations and experiments, anatase TiO2 loaded with 3% V2O5 and 10% MoO3 was developed and demonstrated excellent catalytic activity and stability even in high sulfur content and low-temperature environments. The catalyst was deployed in a pilot plant for over two years, consistently achieving a monthly average denitrification efficiency of over 67% and maintaining an outlet NOx concentration below 50 mg/Nm³. This study provides a robust and efficient low-temperature catalyst for SCR denitrification and offers valuable insights for future catalyst optimization.
研究领域:
环境科学
·
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 36
·24689-24695
·
IF 4.123
Minghai Yao,Peng Wu,Shuang Cheng,Lufeng Yang,Yuanyuan Zhu,Mengkun Wang,Haowei Luo,Bangfen Wang,Daiqi Ye,Meilin Liu
α-V2O5 nanowires with a layered structure have been fabricated through a two-step procedure. When measured as a pseudo-capacitive electrode with a three-electrode configuration in 1 M Na2SO4 aqueous solutions, α-V2O5 exhibits ideal capacitive characteristics with a specific capacitance of ∼238 F g−1 at a high current of 2 A g−1, but poor cycling stability with a continuous drop in the first 2000 cycles before it is maintained. To find possible solutions towards this problem, the energy storage behavior of the α-V2O5 electrode has been carefully investigated. In situ Raman analysis suggests that it is electrolytic hydrated cations [Na(H2O)n]+ rather than anions (SO42−) that are involved in the energy storage process through reversible adsorption/desorption on the surface or intercalation/deintercalation at the interlayer of the (001) planes accompanied by interlayer spacing expansion/contraction. Moreover, the electrochemical quartz crystal microbalance results indicate that, besides a reversible mass change, there is a continuous mass loss that may originate from slow dissolution of V2O5, which should bear the main responsibility for the poor stability (initial dramatic drop). Hence, how to inhibit dissolution, such as by coating or adding additives in the electrolyte, is found to be the key approach to improve the stability of V2O5 based electrodes.
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
Tungsten
·
2024
·
IF 5.6
Zhang Zhi-Qi,Yang Liu,Luo Wen,An Vladimir,Li Jing,Liu Bao-Dan
The design and synthesis of vanadium-based denitration catalysts with low-temperature activity pose significant challenges in the field of toxic gas catalysis. In this study, we have developed a novel approach to fabricate highly efficient V 2 O 5 -WO 3 /TiO 2 monolithic mesh catalysts for NO x reduction at low temperatures. First, TiO 2 nanosheets with strong adhesion and large surface area were grown on Ti mesh using plasma electrolytic oxidation technology and hydrothermal method. Then, super-small traces of WO 3 and V 2 O 5 active nano-species were subsequently deposited on TiO 2 nanosheets using the deposition–precipitation method. Compared to traditional ceramic-based V 2 O 5 -WO 3 /TiO 2 catalysts, our V 2 O 5 -WO 3 /TiO 2 monolithic mesh catalyst exhibits superior mechanical performance, excellent thermal conductivity, lower pressure drop, higher utilization of active components, and stronger synergistic effects. Significantly, the V 2 O 5 -WO 3 /TiO 2 monolithic mesh catalysts exhibited excellent low-temperature catalytic activity with 98% of NO x conversion at 220 ℃, and remarkable long-term SO 2 tolerance and water resistance in the selective catalytic reduction (SCR) of NO x with NH 3 . The SCR reaction of tiny V 2 O 5 and WO 3 active species supported on TiO 2 nanosheets directly demonstrated to follow the Eley–Rideal mechanism by in situ infrared spectra.
研究领域:
催化
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bowen Li,Zhen Zhang,Tingfeng Shan,Qi Zhang,Yusi He,Xiangfu Wang,Hongmin Yang
The by-product SO 3 , generated by the conventional catalyst V 2 O 5 -WO 3 /TiO 2 employed in selective catalytic reduction (SCR) systems, has garnered attention in pollution control efforts. Studies on existing control have predominantly concentrated on the tail gas section, with insufficient understanding of in-situ suppression theories and methods at the source of SO 3 generation. We propose for the first time the introduction of low-valence reduced sulfur to synthesize a novel SCR catalyst, V 2 O 5 -WS 2 /TiO 2 , which elucidates the remarkable effect and in-situ mechanism of action in inhibiting SO 3 formation at its source. Compared to conventional catalysts, the new catalysts showed enhanced SO 3 inhibition, particularly at 350 °C, where SO 3 production was 64.1 % and 33.9 % lower than that with VTi and VW/Ti catalysts, respectively. This was due to their reduced surface area, smaller pore volume, and fewer alkaline sites, which hindered SO 2 adsorption and oxidation. The results revealed that S 2− on the catalyst surface reacts with V 5+ , reducing it to V 4+ and V 3+ . This reaction hinders the interaction between V 5+ -OH and adsorbed SO 2 , thereby reducing the formation of VOSO 4 intermediates. Furthermore, the W S bond in WS 2 impedes the formation of intermediate HSO 4 − , and the reduction of these intermediates ultimately leads to a decrease in SO 3 generation. Additionally, the incompletely depleted S 2− reacts with the final SO 3 produced, forming SO 2 and SO 4 2− , which further decreases the SO 3 generation rate and supports the maintenance of a reduced state on the catalyst surface. It is evident that low-valence reduced sulfur plays a crucial role in inhibiting SO 3 generation.
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zulfiqar Ali,Yang-wen Wu,Yue Wu,Zulqarnain Arain,Ming-xin Xu,Qiang Lu,Heping Ma,Huan-yu Zhao
Lead (Pb) species are inescapable constituents of the flue gas from coal-fired power plants and other thermal devices, which can cause impeding effects on the selective catalytic reduction (SCR) reactions. Here, the poisoning effects of Pb on the V 2 O 5 -MoO 3 /TiO 2 type SCR catalyst were examined. The poisoned catalysts were prepared by the solid diffusion and incipient wetness impregnation (IWI) methods. The catalytic activity tests indicated that the Pb-doped catalyst prepared by the IWI method suffered a considerable drop in catalytic activity, while a slender influence was observed on the Pb-loaded catalysts prepared by solid diffusion method. Comprehensive characterizations and density functional theory (DFT) calculations were performed on the fresh and poisoned catalysts prepared by the IWI method to unveil the deactivation mechanism. The results showed that Pb species covered the active sites (V species) on the catalyst surface, resulted in the decrease in chemisorbed oxygen, hence reducing the surface acidities. The decrease in reducibility of the catalyst was an important factor for poisoning of the catalyst. Moreover, Pb species reacted with MoO 3 to form PbMoO 4 which agglomerated on the catalyst surface to further deactivate the catalyst.
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
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhixiang Ren,Ao Li,Xinyu Lei,Zhengwei Yu,Guangying Wang,Hongliang Zhang,Huan Chen,Yin Wang,Hongming Long
As a mainstream moderate-high temperature (250–420 °C) particulate denitrification catalyst, V 2 O 5 -WO 3 /TiO 2 (VWT) is not applicable to low-temperature (60–150 °C) iron ore sintering flue gas after semi dry/wet desulfurization. In order to improve the NH 3 -deNO x performance of the VWT particle catalyst at low temperatures, a series of powder VWT denitrification catalysts doped with different content of RuO 2 (R-VWT) prepared by the wet co-impregnation method were researched, and found that the particulate catalyst service temperature (about 100 % NO conversion) is lowered from 225 °C (VWT) to below 175 °C by doping 0.5 % RuO 2 . In addition, a series of characterizations indicate that the doped RuO 2 enhances the redox performance of R-VWT and promotes the generation of more surface active intermediate monodentate nitrate, and accelerates the low-temperature surface SCR transient reaction rate.
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
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Yueming Xin,Haiyan Xu,Yang He,Dandan Chen,Dongcai Li,Aiguo Wang,Daosheng Sun
The regular channels and pores of metal–organic frameworks facilitate Li diffusion and insertion, reduction of polarization, and stabilization of electrolyte–electrode interfaces in lithium-ion batteries. In this paper, a thin layer of zeolitic imidazolate framework-8 (ZIF-8) with a thickness of about 2–4 nm was decorated on the surface of V2O5 by a one-step wet chemical method at room temperature. Various techniques were used to characterize the sample, including X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy coupled with energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller analysis, and Fourier-transform infrared spectroscopy. Cyclic voltammetry, electrochemical impedance spectroscopy, and hybrid pulse power characteristic and galvanostatic intermittent titration techniques were also used to test the electrochemical performance. The electrochemical test results showed that the capacity of V2O5@ZIF-8 was 14 and 58% higher than that of V2O5 at 0.3 and 3 C, respectively, and the capacity retention of V2O5@ZIF-8 still reached 81% after 100 cycles at 0.3 C, which means better structural stability and excellent rate performance of V2O5@ZIF-8. High-speed ion channels of V2O5@ZIF-8 led to smaller polarization. The overpotential of oxidation–reduction from V2O5@ZIF-8 reduced the maximum by more than 90%. The intervention of the porous coating prevented the erosion of V2O5 by the electrolyte and maintained the structure stability. This work aimed to improve the overall electrochemical performance of lithium-ion batteries and provided guidance for future research.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 17
·10543-10551
·
IF 10.733
Jin Song,Xiaojun Gu,Yaduo Cao,Hao Zhang
From the perspective of controlling visible-light-driven catalytic activities of supported metal catalysts by tailoring the band structures of semiconducting supports, we calcined pristine V2O5 in a H2 atmosphere at 250–350 °C to synthesize a series of porous two-dimensional V2O5 nanosheets with narrow bandgaps and rich oxygen vacancies, which supported Co and Ni nanoparticles as catalysts for visible-light-driven on-demand H2 evolution from ammonia borane (NH3BH3) in aqueous solution at 25 °C. The systematic investigations showed that all the catalysts had higher activities under visible light irradiation than in the dark and one Co catalyst exhibited the highest photocatalytic activity with a total turnover frequency (TOF) value of 120.4 min−1, which exceeded the values of all the reported noble metal-free catalysts. Structural characterization indicated that pristine V2O5 and the three post-modified V2O5 species had different bandgaps, valence band positions and concentrations of oxygen vacancies as well as different photocurrent densities, leading to different electron densities of active metal NPs in the supported catalysts with different catalytic activities. This was verified using the UV-vis spectra, valence band X-ray photoelectron spectroscopy, X-ray diffraction patterns and electrochemical characterization of various V2O5 species and the corresponding photocatalytic performance of catalysts.
研究领域:
材料科学
·
催化化学
✓ 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）