CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bingbing Hu,Chuanlan Xu,Muhammad Kashif Aslam,Yuan Cen,Jiahong Hu,Yan Li,Yuping Liu,Chaozhong Guo,Danmei Yu,Changguo Chen
In this work, multilayer networks lanthanum-doped V 2 O 5 · n H 2 O@OAB (noted as La-VOH@OAB) binder-free thin film positive electrode has been first successfully synthesized via a simple and economical sol-gel and drop-coating methods. Benefiting from its unique architecture and the favorable synergetic contributions for rare earth metal ions of La 3+ and hydrophilic carbon of OAB, after the condition optimization, the 20%La-VOH@OAB-4 exhibits an excellent electrochemical performance with an ultrahigh specific capacitance of 612 F g −1 at a current density of 1 A g −1 , good rate capability (81.1%, the current density increases tenfold) and outstanding cycling stability (90.4% capacitance retention over 2000 cycles). In addition, flexible Fe 2 O 3 @rGO binder-free thin film negative electrode prepared with the similarly facile strategy demonstrates a high specific capacitance of 366 F g −1 due to Fe 2 O 3 nanoparticles tightly anchored on the rGO surface. The assembled 20%La-VOH@OAB-4//Fe 2 O 3 @rGO ASCs device within a voltage window of 1.7 V delivers a relatively high specific energy density of 56.3 Wh kg −1 at a power density of 849.9 W kg −1 with exceptional cycling stability (81.3% capacitance retention after 5000 cycles), moreover, two ASCs devices in parallel can light up a red LED for 3 min, demonstrating its potential in practical applications. This work provides a certain reference for the fabrication of environmentally friendly thin film electrodes for developing high efficient energy storage systems.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yiqing Zeng,Weilong Rong,Shule Zhang,Yanan Wang,Qin Zhong
Ammonia selective catalytic reduction (NH 3 -SCR) technique for nitrogen oxide (NO x ) elimination of low temperature flue gas (<200 °C) requires huge energy consumption and operation costs. In this work, a CuO modified V 2 O 5 -WO 3 /TiO 2 (Cu/VWTi) catalyst are constructed to achieve the aim of enhancing the temperature of flue gas via using the heat released by CO oxidation, thereby promoting the NH 3 -SCR of NO x reaction. Benefiting from the synergistic effect between CuO and VWTi in the adsorption and activation of reactants, Cu/VWTi catalyst shows high NO x (>90%) and CO (>90%) removal efficiency at the temperature range of 225–270 °C and a GHSV of 40,000 h −1 . Moreover, it is found that the completely oxidation of 2000 ppm CO can increase the flue gas temperature by about 20 °C. Therefore, developing catalyst that can achieve simultaneously NH 3 -SCR of NO x and CO oxidation is a feasible method to deduce the energy consumption and operation costs of NH 3 -SCR of NO x system in low temperature flue gas. Finally, the reaction process and SO 2 deactivation effect over Cu/VWTi catalyst was studied via in-situ DRIFT. This work might provide some guidance for the design of catalysts to eliminate multiple pollutants.
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
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Jiaying Xing,Qitong Xue,Jianjun Chen,Jinxing Mi,Xiaoping Chen,Jianqiang Shi,Zhiming Liu,Junhua Li
Vanadium-based catalysts play a pivotal role in the emission control of industrial NOx via selective catalytic reduction (SCR) technology. However, little attention has been paid to the potential emission of greenhouse gas N2O under complex working conditions. This work reports that a commercial V2O5/TiO2 catalyst may lead to significant N2O emission without greatly changing the outlet NOx concentration after chromium (Cr) deposition. With a Cr loading of 2 wt %, N2O concentration increased from 27.8 to 199.2 ppm at 350 °C with the value of outlet N2O/(N2O+N2) from 2.5% to 19.4%. Experimental results combined with DFT+U calculations suggest that nonselective catalytic reduction (NSCR) is the main route for N2O formation in a wide temperature range of 250 ∼ 400 °C. It is stemmed from the fact that the covalent interaction between Cr and V species on the V2O5/TiO2 surface accelerates the conversion of V4+ + Cr6+ → V5+ + Cr3+, leading to a larger proportion of surface V5+. More importantly, surface V5+ is highly related to the redox property of the V2O5/TiO2 catalyst, which is beneficial to NSCR reaction rather than the standard SCR process. The work suggests that to better inhibit the emission of greenhouse gases during the NH3–SCR process, monitoring N2O emission should be included along with the NOx concentrations, especially in complex flue gases.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Fangting Liu,Qiaoyu Zhang,Chengcheng Chen,Zhengguo Zhang,Xiaoming Fang
The key to construct an efficient direct Z-scheme heterojunction lies in the selection of two semiconductors with matching Fermi energy levels, visible light response capability and the elaborately designed interface. Herein, a research method that theoretical calculation first and then experimental study was employed to develop an efficient direct Z-scheme V 2 O 5 /C 3 N 5 photocatalyst for hydrogen production . First, the theoretical calculations on the V 2 O 5 (110)/C 3 N 5 (001) heterojunction suggested the large interface binding energy between these two components, their visible-light absorption properties and matching Fermi energy levels, and the charge difference density of V 2 O 5 /C 3 N 5 allowing the migration path of photogenerated carriers in composite structure, which satisfies the requirements for constructing a direct Z-scheme. Then, the V 2 O 5 /C 3 N 5 heterojunction was experimentally constructed by calcining the mixture of 3-amino-1,2,4-triazole and ammonium metavanadate , which Z-scheme charge transfer path was further verified by free radical trapping and in situ irradiated XPS analyses. We also found that N–O bonding was formed between C 3 N 5 and V 2 O 5 , which could provide a favorable interface for facilitating the charge transfer within the heterojunction. The optimal V 2 O 5 /C 3 N 5 -3.7 heterojunction exhibited a H 2 yield of 329.9 μmol/h under the visible light irradiation , 19.8 times that of single C 3 N 5 , and showed an apparent quantum efficiency of 7.21% at 420 nm. The high charge separation of the V 2 O 5 /C 3 N 5 heterojunction is revealed to be mainly responsible for the enhancement in its photocatalytic activity . This work sheds light on the research method that consists of theoretical design first and then experimental study for constructing high-efficiency direct Z-scheme heterojunctions.
研究领域:
材料科学
·
理论计算与实验研究
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Xin Zhao,Lei Huang,Hongrui Li,Hang Hu,Jin Han,Liyi Shi,Dengsong Zhang
Different transition metals were used to modify V 2 O 5 -based catalysts (M-V, M = Cu, Fe, Mn, Co) on TiO 2 via impregnation, for the selective reduction of NO with NH 3 . The introduced metals induced high dispersion in the vanadium species and the formation of vanadates on the TiO 2 support, and increased the amount of surface acid sites and the strength of these acids. The strong acid sites might be responsible for the high N 2 selectivity at higher temperatures. Among these catalysts, Cu-V/TiO 2 showed the highest activity and N 2 selectivity at 225–375 °C. The results of X-ray photoelectron spectroscopy, NH 3 -temperature-programmed desorption, and in-situ diffuse reflectance infrared Fourier transform spectroscopy suggested that the improved performance was probably due to more active surface oxygen species and increased strong surface acid sites. The outstanding activity, stability, and SO 2 /H 2 O durability of Cu-V/TiO 2 make it a candidate to be a NO x removal catalyst for stationary flue gas.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Xiaoqiang Gao,Fang Zhang,Yi Yu,Yonghui Dou,Li Xu,Guoji Liu
Mo-modified V 2 O 5 /TiO 2 catalysts were prepared by wetness impregnation method and investigated for the selective oxidation of 2-methylnaphthalene to 2-naphthaldehyde. The catalysts were characterized by XRD, BET, XPS, and Raman to investigate the promotional effect of Mo on catalyst structure, surface property, and catalytic performance. The introduction of molybdenum decreases the amount of KVO 3 phase and enhances the dispersion of the vanadium phase. XPS and Raman results indicate that Mo prevents Sn and K to interact with V species and bonds with Ti or V through bridge oxygen. V1Mo1 sample demonstrates a remarkable improvement in conversion and selectivity compared with others.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiangsen Xu,Fengye Lyu,Jiahao Chen,Yiqing Zeng,Zhaoxiang Zhong,Feng Zhang,Weihong Xing
In this work, TiO 2 nanocones grown on SiC membrane was used as the support of V 2 O 5 -WO 3 species to prepare V 2 O 5 -WO 3 /TiO 2 @SiC (VWTi(C-X)@SiC) catalytic membrane for dust filtration and NH 3 -SCR denitration. On account of the large specific surface area, abundant surface acid sites and prominent redox property, the optimized VWTi(C-550)@SiC catalytic membrane shows >90% NO removal efficiency at the temperature of 280–360 °C, which are much higher than VWTi(P-550)/SiC catalytic membrane (TiO 2 nanoparticles prepared by traditional vacuum coating titanium sol method was used as the support of V 2 O 5 -WO 3 species, NO conversion <80% at whole tested temperature). Additionally, VWTi(C-550)@SiC displays superior stability during the SO 2 + H 2 O resistance and 300 h long-term test at 300 °C, and exhibits an excellent dust filtration performance (2.5 μm SiO 2 particles interception rate exceeded 99.99%) under all test conditions. More importantly, the structure of nanocones decrease the influence of tensile stresses due to the different thermal expansion coefficients of TiO 2 and SiC membranes, which significantly suppress the fall of VWTi catalyst layer from the surface of SiC during pulse-jet cleaning. Among above results, it can be concluded that the optimized VWTi(C-550)@SiC catalytic membrane shows a prosperous application prospect for the simultaneously dust filtration and NH 3 -SCR denitration of medium–high temperature flue gas .
研究领域:
环境科学
·
催化材料
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Min Fu,Qingru Zhuang,Zitong Zhu,Zhihao Zhang,Wei Chen,Qingyun Liu,Hao Yu
Hybrid electrode materials are key for electrochemical performances of supercapacitors . In this work, vanadium pentoxide (V 2 O 5 ) is grown on graphene by a microwave synthetic method, which is simple, rapid, energy-saving and efficient. Benefiting from the microwave synthetic method, uniform V 2 O 5 nanoparticles with an approximately size of 20 nm are evenly dispersed on graphene. The resultant V 2 O 5 /graphene composites are assembled into symmetrical supercapacitors , exhibiting specific capacitances of 673.2 and 474.6 F g −1 at 1 and 10 A g −1 , respectively, and 96.8% of capacitance retention after 10,000 cycles at 1 A g −1 . Additionally, the assembled devices show outstanding energy density and power density characteristics (46.8 Wh kg −1 at 499.4 W kg −1 and 32.9 Wh kg −1 at 4746.0 W kg −1 ), which are superior than many similar devices. Furthermore, capacitive performances of V 2 O 5 /graphene composites with five different component ratios are thoroughly investigated and the charge storage mechanism is discussed.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Misganaw Alemu Zeleke,Dong-Hau Kuo
Methylene blue dye is among the toxic, mutagenic, and carcinogenic pollutants. Hence, its treatment via photocatalytic degradation is an important remediation method for the sake of a healthy environment. Herein, the V 2 O 5 -CeO 2 nanocomposite catalysts were synthesized via a simple precipitation-thermal decomposition approach and used for the photodegradation of methylene blue in the presence of H 2 O 2 as an effective electron scavenger under visible light illumination. The nanocomposite catalysts were systematically characterized to investigate the effects of V 2 O 5 with the aids of X-ray, morphology, light absorption , catalytic activity , and charge transfer properties of the nanocomposite catalysts. The VC-2 nanocomposite prepared with NH 4 VO 3 :CeO 2 molar ratios at 0.15:1 was found to be the best efficient catalyst where ≥98% of methylene blue was degraded within 25 min irradiation time. From the kinetics analysis, its rate constant was found to be higher than those of the pure V 2 O 5 and CeO 2 catalysts by a factor of 12.0 and 13.5, respectively. The plausibly mechanistic elucidation of charge transfer and utilization of reactive species are conspicuous allegations of the combined effects of the nanocomposite catalyst, H 2 O 2 sacrificial agent, and visible light for the photodegradation of the dye.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2019
·Vol. 14
·期 3
·e2309
·
IF 1.396
Zulfiqar Ali,Qiang Lu,Tahir Iqbal,Zulqarnain Arain,Jian Han,Yang-wen Wu,Ding-jia Liu,Yong-ping Yang
Heavy metal Pb is an inevitable ingredient of coal-fired flue gas and has been proven to be a source of inhibiting effect on the selective catalytic reduction (SCR) catalyst. In this paper, two types of Pb-poisoned catalyst, prepared by the incipient wetness impregnation and solid diffusion methods, are studied to unveil the poisoning effects of lead species on the V 2 O 5 -WO 3 /TiO 2 catalyst. The activity test results showed that lead species loaded by the incipient wetness impregnation method exhibited a significant inhibiting effect on the denitrification efficiency of the catalyst although a negligible activity loss was observed on the samples from the solid diffusion method. Characterizations of fresh and Pb-poisoned catalysts from incipient wetness impregnation method were applied using comprehensive techniques such as X-Ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray fluorescence (XRF), NH 3 -temperature programmed desorption (NH 3 -TPD), X-Ray photoelectron spectroscopy (XPS), and so forth. The analytical results indicated that a phase transformation occurred in tungsten species and the amorphous WO 3 converted into PbWO 4 , causing the accumulation and valence imbalance of active vanadium phase, which further decreased the surface acidity and activity of the V 2 O 5 -WO 3 /TiO 2 catalyst.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Zhou Su,Mingshu Zhao,Lidong Jiao,Mangmang Shi,Min Li,Feng Li,Qiuwen Wang,Hongchuan Zhu
Aqueous zinc-ion batteries (AZIBs) are considered as an attractive alternative to lithium-ion batteries. Although the vanadium pentoxide (V2O5) cathode exhibits high theoretical capacity of 589 mA h g–1 for zinc-storage, it suffers from capacity decay and sluggish Zn2+ diffusion kinetics due to the strong electrostatic interactions with Zn2+, slight dissolution in aqueous electrolytes, and low electronic conductivity. Herein, the polyaniline and alkali-earth cation (Mg2+, Ca2+) cointercalated V2O5 composites (PVO-Mg, PVO-Ca) are fabricated to boost the zinc ion storage performance of vanadium oxide cathodes. PVO-Mg exhibits an enlarged interlayer distance of 14.15 Å and a tremelliform nanoarchitecture composed of nanosheets. The intercalated polyaniline and alkali-earth cations not only expand the Zn2+ diffusion channels but also form a pillar net which can improve the structural stability and electronic conductivity of the layered structure, contributing to superior electrochemical kinetics, interfacial kinetics, and Zn2+ diffusion kinetics. Moreover, ex situ X-ray diffraction results of PVO-Mg show a nearly constant interlayer distance during the insertion and extraction of Zn2+, which indicates that polyaniline and Mg2+ firmly support the layered framework and prevent the expansion and contraction of the interlayer distance. Ex situ X-ray photoelectron spectroscopy results of PVO-Mg reveal the highly reversible formations of Znx(CF3SO3)y(OH)2x−y·nH2O on the electrode surface and Zn2+ inserted PVO-Mg inside the electrode, as well as a H+ and Zn2+ insertion/extraction process during which the polyaniline serves as a H+ reservoir and a capacity contributor. Consequently, the PVO-Mg electrode exhibits high capacity (387.0 mA h g–1 at 0.5 A g–1), ultrafast rate capability (199.3 mA h g–1 at 30 A g–1), improved cycling stability, and high reversibility and would be a promising cathode for high performance AZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 40
·18803-18810
·
IF 3.3
Yanmei Liang,Danqin Li,Yao He,Shixing Chao,Mingming Zhang,Xueqian Zhao,Weiqiang Zhou,Jingkun Xu,Baoyang Lu
The development of asymmetric supercapacitors (ASCs) with high power and energy density is greatly restricted by the low capacitance of the anode materials. V2O5 is a promising anode material with high theoretical capacity, but its low conductivity and high dissolution are not conducive to applications in energy storage. Herein, oxygen-vacancy PEDOT/V2O5 ultrathin nanosheets with a thickness of about 4.4 nm are fabricated by the oxidative polymerization of EDOT monomers on V2O5 nanosheets in the absence of other oxidants. The results of XPS and EPR confirm that the polymerization of PEDOT increases the oxygen vacancy concentration of V2O5. The PEDOT/V2O5 nanosheets exhibit a specific capacitance of 406 F g−1 at 2 mV s−1 and excellent cyclic stability in the mixed organic electrolyte of dimethyl carbonate and ethylene carbonate. The energy density of ASCs composed of PEDOT/V2O5 as the anode and activated carbon as the cathode reaches 65 W h kg−1 at a power density of 1490 W kg−1. This means that PEDOT/V2O5 has enormous potential in high-energy storage.
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
危险品化学品经营许可证（带存储）