JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Kaiyi Chen,Liang Zhang,Xin Huang,Fuchun Zhang,Gangqiang Zhu,Qizhao Wang
Zr-doped BiVO 4 photoanodes modified with CoF 2 co-catalyst (Zr-CoF 2 /BiVO 4 ) were designed and synthesized by a simple two-step hydrothermal and calcination method. The photocurrent density of the prepared Zr-CoF 2 /BiVO 4 photoanode is as high as about 3.6 mA/cm 2 at 1.23 V vs. RHE (AM 1.5 G). The excellent PEC performance benefits from the cocatalyst loading and the formation of heterojunction . The Zr-CoF 2 /BiVO 4 composite photoanode improves the transfer efficiency of photogenerated carriers and the yield of water splitting. Co 2+ site in the CoF 2 co-catalyst has excellent water oxidation activity. The metal Zr doping further improves charge separation and conduction, thereby reducing the electron-hole complexation rate to affect PEC performance, enhancing photocurrent as well as oxygen release and providing an effective reference method for exploring solar water decomposition. This scheme provides an effective reference method for exploring solar water decomposition.
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Catalysts
·
2023
·Vol. 13
·期 5
·915
·
IF 3.9
Xiaofeng Yu,Chunjie Shi,Yueling Cheng,Yejing Zhu,Renyuan Song,Shengfei Hu
Methyl benzoate (MB) compounds are prepared by reacting various benzoic acids with methanol using an acidic catalyst. In this study, the solid acids of zirconium metal solids fixed with various substances were studied. We determined that zirconium metal catalysts with fixed Ti had the best activity. The catalytic synthesis of a series of MB compounds using titanium zirconium solid acids was studied. The direct condensation of benzoic acid and methanol using a metallic Lewis acid without other auxiliary Bronsted acids is reported for the first time.Keywords:methyl benzoate;solid acid;catalysis
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Hui Liu,Hongyan Li,Bin Lu,Songnan Li,Jingxiang Zhao,Qinghai Cai
A composite catalyst was prepared by impregnation of ZSM-5 in mixture solution of Co(NO 3 ) 2 , ZrOCl 2 and phosphotungstic acid (PW) and characterized by XRD , FT-IR, UV–vis, XPS , SEM and TEM techniques to confirm its structure and composition . The pre-prepared composite is composed of Co 2 (PO 4 )Cl, ZrO 2 , P 2 O 5 and WO 3 crystalline nanoparticles uniformly dispersed on ZSM-5 zeolite . The prepared composite demonstrates effective catalytic function for solvent-free oxidation of toluene into benzaldehyde with H 2 O 2 oxidant, achieving 16.6% conversion and 90% selectivity . The effect of various components composed of the catalyst and reaction conditions on the catalytic function were explored. Moreover, the recovery and reusability of the catalyst were estimated, presenting good reusability.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·D65
·
IF 3.12
Min Li,Ying Li,Zhaowen Wang
The electrochemical reduction of zirconium oxide in a molten salt of 2.4NaF·AlF3 (molar ratio = 2.4) was studied at 1273 K. Cyclic voltammetry results show that Zr(IV) ions are first reduced to an intermediate valence and, then, are co-deposited with aluminum to form an Al-Zr alloy. Potentiostatic electrolysis experiments were carried out at different potentials (−0.95 and −1.25 V) and at 1273 K, and the electrolysis products were characterized using SEM-EDS and XRD. The XRD analysis confirms that a mixture of cryolite molten salt and ZrO2 was electrodeposited at −0.95 V, while aluminum and Al3Zr were electrodeposited at −1.25 V. The SEM analysis shows that the aluminum and Al3Zr were in two different phases.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Tingwei Zhang,Yijuan Lu,Wenzhi Li,Mingxue Su,Tao Yang,Ajibola Ogunbiyi,Yongcan Jin
In order to efficiently produce γ-valerolactone (GVL) from furfural , a Zr-graphitic carbon nitride/H-β composite (Zr CN/H-β) had been simply prepared via an impregnation-calcination protocol. The morphology and structure, elemental information, and total acid and base properties of the Zr CN/H-β and related catalysts (H-β, CN/H-β, and Zr/H-β) were determined by SEM, TEM , X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption (TPD-NH 3 , CO 2 ) characterizations. The effects of reaction temperature and time, and the furfural dosage on GVL production as well as the recyclability of Zr CN/H-β were investigated. With a catalyst/furfural dosage of 0.1/0.22 g, the Zr CN/H-β produced a remarkable 76.5% of GVL yield at 160 °C in 18 h using isopropanol as the solvent. The results of NH 3 , CO 2 -TPD experiments indicated that the simultaneous introduction of Zr species and carbon nitride onto H-β formed new types of acid and base, which should be responsible for the high efficient conversion of furfural to GVL. Additionally, the recyclability of Zr CN/H-β was reasonable.
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BIOMASS & BIOENERGY
·
2018
·
IF 3.358
Jiaxiong Liu,Yajin Li,Huimin Liu,Dehua He
Ce 1-x Zr x O 2 (0 ≤ x ≤ 0.2) solid solutions were prepared by hydrothermal method and applied for the synthesis of glycerol carbonate from glycerol and CO 2 in the presence of 2-cyanopyridine (dehydrant) with dimethyl formamide (DMF) as a solvent. The physicochemical properties of the catalysts were characterized by ICP, XRD , BET, H 2 -TPR, CO 2 /NH 3 -TPD, TEM and XPS . The activation route of CO 2 and glycerol were measured by DRIFTS and FT-IR. Compared to pure CeO 2 , Ce 1-x Zr x O 2 solid solutions exhibited enhanced activity in the present reaction system, and the improved catalytic activity was associated with the BET surface area and the acid-base properties. DRIFTS results showed that the chelating bidentate carbonate species was the main adsorption pattern for CeO 2 and no striking differences between Ce 0·98 Zr 0·02 O 2 and CeO 2 . FT-IR spectra of the spent catalysts revealed that glycerol and 2-cyanopyridine could be activated on CeO 2 -based catalysts, and an ester intermediate was formed for the production of glycerol carbonate. Thus, a plausible mechanism is proposed for the synthesis of glycerol carbonate from glycerol and CO 2 in the presence of 2-cyanopyridine in DMF solvent over CeO 2 -based catalysts. Moreover, the recyclability of Ce 0·98 Zr 0·02 O 2 was measured and the catalysts could be regenerated through a simple calcination process at 400 °C for 5 h in air.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bo Liu,Liangliang Xiong,Xiaoqiang Fan
In this work, two-dimensional UiO-67 nanosheets are successfully modified on graphene oxide (GO). The synthesized GO@2D-UiO-67 composite not only exhibits the electrical insulation characteristics of Zr-MOF, but also leverages the passive barrier effect of its 2D layered structure to prepare a highly anticorrosive epoxy coating. Electrochemical measurements reveal that the impedance modulus of the GO@UiO-67/EP composite coating remain two orders of magnitude higher than that of the pure EP coating even after 28 days of immersion in 3.5 wt% NaCl solution. This good long-term anti-corrosion performance could derive from the enhanced crosslinking density of composite coating due to the incorporation of GO@UiO-67 nanosheets. Furthermore, the shielding effect of layered structure and the corrosion inhibition behavior of organic ligands are proved to improve the corrosion resistance properties of composite coating. This research fills the application void of two-dimensional Zr-MOF composites in resin coatings, as well as serves as a forward-looking initiative to enhance the long-term corrosion protection of epoxy resin coatings.
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CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
T. Wei,X.D. Wang,C.Z. Zhao,T.B. Zhang,F.M. Yang,W.B. Wang,Y.J. Ma
Er- and Zr-codoped strontium bismuth niobate ceramics, Sr 0.97 Er 0.03 Bi 2 Nb 2− x Zr x O 9 (SBN x ) with different x (0≤ x ≤0.1), were synthesized by the solid state reaction method. Their structural, up-conversion (UC) photoluminescence , and dielectric properties were investigated. By Rietveld structural refinement, all SBN x samples exhibited a polycrystalline bismuth-layered perovskite structure with space group A2 1 am. With deliberate introduction of Zr 4+ ions in the bismuth-layered perovskite structure, SBN x samples presented simultaneously enhanced UC photoluminescence and dielectric properties. The UC photoluminescence was investigated as a function of Zr 4+ concentration and incident pump power. Under the 980 nm near infrared (NIR) excitation, bright UC green and weak red emissions were observed which corresponded to the transitions from 2 H 11/2 / 4 S 3/2 and 4 F 9/2 to 4 I 15/2 level, respectively. With x increase, the UC luminescence improvement of SBN x can be attributed to the local distortion of crystal field surrounding the Er 3+ activator which induced by different ionic radii of Zr 4+ and Nb 5+ ions. The dependence of UC emission intensity on pumping power showed that two photon energy transfer process was involved in the UC green and red emissions. Furthermore, electrical measurements indicated that the introduction of Zr 4+ distinctly increased the ferroelectric to paraelectric phase transition temperature ( T C ) of SBN x ceramics from 724 K to 762 K as x ranging from 0.0 to 0.1. It is believed that B site doping in SBN x by large Zr 4+ ion is an effective method to improve UC luminescence and electrical properties of this potentially multifunctional optical-electro material.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13277-13282
·
IF 0
Ru-Jun Chen,Mian Huang,Wen-Ze Huang,Yang Shen,Yuan-Hua Lin,Ce-Wen Nan
Li–La–Zr–O thin films were successfully fabricated using a sol–gel spin coating method, and the effects of altering the annealing temperature and the number of layers of the films on electrolyte conductivity were studied. Using X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy, the characteristics of these films were investigated as a function of annealing temperature and the numbers of layers of the film. With these methods, an amorphous structure and a smooth surface on the films were revealed. The thin film's ionic conductivity was investigated by impedance analysis. The results show that the ionic conductivity of the films decreases with an increase of the annealing temperature, from 1.67 × 10−6 S cm−1 for 600 °C annealing to 8.53 × 10−7 S cm−1 for 800 °C annealing. The influence of film thickness on conductivity was investigated and the conductivity followed an inverse u-shaped curve with increasing film thickness. We propose that Li–La–Zr–O thin films may be promising solid electrolytes for solid-state lithium-ion batteries.
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RSC Advances
·
2017
·Vol. 7
·期 22
·13325-13330
·
IF 3.108
Zhenlong Zhang,Junfeng Li,Xiaoli Wang,Jianqing Qin,Wenjia Shi,Yuefeng Liu,Huiping Gao,Yanli Mao
In this paper, Zr and N co-doped TiO2 (Zr/N–TiO2) nanorod arrays were synthesized using a hydrothermal method and perovskite solar cells were fabricated using them as an electron transfer layer. The solar cells based on Zr/N–TiO2 presented an enhanced performance compared with those based on un-doped TiO2. The solar cell performance was optimized by changing the Zr doping content. The efficiency of solar cells based on Zr/N–TiO2 with a Zr doping content of 1% (Zr/Ti, atomic ratio) has been achieved at 12.6%, which was 31.6% higher than that of solar cells based on un-doped TiO2. To get an insight into the enhancement, some investigations were carried out. The results indicate that the larger open voltage (Voc) could be due to the larger conduction band offset resulting from the smaller energy band gap for Zr/N–TiO2, and the enlarged short current (Isc) could be attributed to the faster electron transfer and reduced recombination rate for Zr/N–TiO2 NRs. These induce the enhancement of solar cell efficiency.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2015
·Vol. 26
·期 2
·285-293
·
IF 1.16
Jiang Hualin,Zhang Weibo,Chen Pinghua,He Qinghua,Li Menglin,Tian Lei,Tu Zhui,Xu Yang
A novel La–Zr composite was prepared by one pot method in mild conditions, and it shows a high fluoride removal ability of 143 mg/g. The powders were characterized by SEM, EDS, and FTIR. The effects of various factors such as pH, the presence of coexisting anions, contacting time, and initial fluoride concentration were investigated. The equilibrium data were studied by being fitted to several isotherm models, and the kinetic data are found to be described very well by the pseudo-second-order kinetic model. The overall rate of fluoride adsorption is likely to be controlled by chemisorption processes. The mechanism of adsorption was discussed in detail.
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Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Jiahao He,Chao Song,Longze Chen,Sicheng Xin,Pengfei Xiang,Wenbin Li,Chong He
Elastic zirconium-based ceramic fiber products have gain particular interest due to their exceptional high-temperature resistant performance. Nonetheless, commercial high-performance Zr-based fibers are still difficult to acquire which hinders its widely application in thermal insulation scenes. Herein, large-scale fabrication of various Zr-based (ZrO 2 , ZrSiO 4 ) ceramic fibers were achieved through solution blow spinning technology, which was endowed with merits such as cost-effectiveness, high production efficiency, reduced energy consumption, and exceptional product quality. Through high-temperature sintering to 1000 °C, blow spun organic fibers can be converted into Zr-based ceramic fibers with diameters ranging from 0.5 to 2 μm. Optimizing the crystalline structure of these fibers through high-temperature pyrolysis process enhanced their thermal resistance. Additionally, through introducing polysiloxane as the Si source, ZrSiO 4 fibers can be synthesized with markedly improved mechanical properties and high-temperature resistance. These blow-spun Zr-based fiber sponges exhibit advantageous internal pore structures, high-temperature elasticity and thermal insulation performance.
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