CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Liangmiao Zhang,Yi Du,Hui Xia,Fang xia,Guang Yang,Yanfeng Gao
Hydroxypropyl cellulose (HPC) hydrogel is a promising material for fabricating energy saving smart windows. However, its lower critical solution temperature (LCST = 42 °C) is much higher than comfortable room temperatures. In this work, we applied surface polymerization of acrylic acid (AA) monomers on HPC chains and synthesized HPC-polyacrylic acid (PAA) hydrogels with precisely controllable LCST in the range of 23.0–42.0 °C. The fabricated HPC-PAA hydrogel smart windows exhibited excellent T lum , 22 °C of 91.8% and ΔT sol , 22–40 °C of 73.7%, outperforming VO 2 hydrogel composites and photothermal nanoparticles doped hydrogel smart windows. Meanwhile, cesium tungsten bronze (Cs 0.32 WO 3 ) photothermal nanoparticles can be introduced to the HPC-PAA hydrogel matrix, and the near infrared (NIR) shielding ability of Cs 0.32 WO 3 allowed significant reduction of NIR transmittance of the smart windows from 81.7% to 41.6% at 22 °C, and from 19.3% to 3.6% at 40 °C. Temperature regulation tests in model houses revealed outstanding heat-shielding performance of Cs 0.32 WO 3 (0.4 wt %)/HPC-PAA hydrogel smart windows, especially compared with ordinary double-glass windows. Furthermore, the HPC-PAA hydrogel and Cs 0.32 WO 3 (0.4 wt %)/HPC-PAA hydrogel are non-toxic, biocompatible, low-cost, suggesting their suitability for energy-saving smart window applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Hao Jiang,Yian Wang,Jue Hu,Xuxia Shai,Chengxu Zhang,Thiquynhxuan Le,Libo Zhang,Minhua Shao
Hydrogen peroxide (H 2 O 2 ), as one of the most important chemicals, is widely applied in many industries. Electrocatalytic oxygen reduction provides a safe and on-site method for H 2 O 2 synthesis. The research of transition metal oxides (TMOs) for H 2 O 2 synthesis is mainly focused on the modification of transition metal elements and graphene. Few studies directly control pure TMOs without changing supporting materials or introducing other elements. Here, we demonstrate for the first time a phase regulation strategy to develop highly selective and stable tungsten trioxide catalysts for H 2 O 2 generation through 2e − oxygen reduction reaction (2e − ORR). DFT calculations show that the kinetic energy barrier (0.08 eV) of the 2e − ORR pathway on the cubic tungsten trioxide (c-WO 3 ) surface is much lower than that of the 4e − ORR pathway (0.76 eV). As a result, a selectivity of 90 % and H 2 O 2 production rate of 179 mmol g cat −1 h −1 are achieved at 0.1 V vs RHE under alkaline conditions, outperforming all catalysts previously reported under the same conditions. Moreover, after continuous testing for more than 24 h at a constant potential of 0.1 V vs RHE, the H 2 O 2 generation rate has not been diminished, indicating an excellent stability of c-WO 3 in practical applications.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 12
·2079
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IF 5.719
Dong Li,Fachao Wu,Caiyun Gao,Hongfang Shen,Fei Han,Fenglan Han,Zhanlin Chen
In this work, a highly efficient wide-visible-light-driven photoanode, namely, nitrogen and sulfur co-doped tungsten trioxide (S-N-WO3), was synthesized using tungstic acid (H2WO4) as W source and ammonium sulfide ((NH4)2S), which functioned simultaneously as a sulfur source and as a nitrogen source for the co-doping of nitrogen and sulfur. The EDS and XPS results indicated that the controllable formation of either N-doped WO3(N-WO3) or S-N-WO3by changing the nW:n(NH4)2Sratio below or above 1:5. Both N and S contents increased when increasing the nW:n(NH4)2Sratio from 1:0 to 1:15 and thereafter decreased up to 1:25. The UV-visible diffuse reflectance spectra (DRS) of S-N-WO3exhibited a significant redshift of the absorption edge with new shoulders appearing at 470–650 nm, which became more intense as the nW:n(NH4)2Sratio increased from 1:5 and then decreased up to 1:25, with the maximum at 1:15. The values of nW:n(NH4)2Sratio dependence is consistent with the cases of the S and N contents. This suggests that S and N co-doped into the WO3lattice are responsible for the considerable redshift in the absorption edge, with a new shoulder appearing at 470–650 nm owing to the intrabandgap formation above the valence band (VB) edge and a dopant energy level below the conduction band (CB) of WO3. Therefore, benefiting from the S and N co-doping, the S-N-WO3photoanode generated a photoanodic current under visible light irradiation below 580 nm due to the photoelectrochemical (PEC) water oxidation, compared with pure WO3doing so below 470 nm.Keywords:N, S co-doped;water oxidation;tungsten trioxide;photoanode;photoelectrochemical;water splitting
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Guang Yang,Daming Hu,Fang Xia,Chuanfan Yang,Yongwei Liu,Xiaoyan He,Yaroslav Shpotyuk,Hongfei Chen,Yanfeng Gao
Tungsten bronze is an effective near-infrared (NIR) shielding material for fabricating energy-saving smart windows. While high-performing NIR-shielding glasses can be fabricated by coating a tungsten bronze film on window glasses, these glasses suffer a short lifespan due to the adhesion and degeneration of film. In this work, we show that tungsten bronze-like material Na5W14O44 can be distributed in the bulk glass matrix during the facile melt-quenching glass fabrication process under an air atmosphere, overcoming the limitations of film-based glasses. X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy confirmed the presence of tungsten bronze-like Na5W14O44 functional units in the SiO2–B2O3–NaF glass matrix. The addition of a small amount of H2WO4 and Sb2O3 is critical for the formation of Na5W14O44 functional units because H2WO4 provides W for Na5W14O44, and Sb2O3 acts as a reducing agent that helps the formation of W5+ in Na5W14O44 under an air atmosphere. Furthermore, the NIR-shielding ability can be tuned by adjusting the concentration of Sb2O3 in the range of 0–1.5 mol % and of H2WO4 in the range of 4–6 mol %. The optimized composition containing 1.25 mol % of Sb2O3 and 5 mol % of H2WO4 exhibits excellent NIR-shielding ability (ΔT = 62.8%), high visible light transmittance (Tmax = 67.7%), and excellent thermal insulation. This performance is comparable to cesium tungsten bronze film-based glasses and much better than soda lime glass and ITO glass under sun irradiation. This study sheds light on fabricating energy-saving windows in a simple and cost-effective way with flexibility for fine tuning of NIR-shielding performance.
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PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2022
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IF 1.193
Lei CHEN,Yu ZHANG,Bin SUN,Juan HE,Shuai KANG,Zhong-Qiu HUA,Chen TIAN
The production of a large number of metal oxide semiconductor materials is more for design needs, while theoretical exploration is relatively less concerned. In this work, WO 3 nanoparticles were prepared by the tungstic acid thermolysis method, and the catalysts of Pt and Ru were loaded on the surface of nanoparticles with a wet impregnation method. As expected, the sensitive responses were enhanced significantly with the additional loading of Pt, which revealed that bimetallic loading could achieve better properties with a smaller loaded amount than single metal. According to the power-law response to oxygen and H 2 -TPR results, the sensitization mechanism of noble metals loaded WO 3 to acetone as the typical VOCs was investigated. The results showed that the sensing processes were dominated by oxygen adsorption behavior and there was no difference with the loading of Ru. Furthermore, the power-law coefficient n became smaller with Pt loading. It is proposed that oxygen adsorbates on the surface become more active due to Pt. We would like to propose further a perspective, i.e., polymetallic loading that utilizes the properties of different metals to achieve synergism.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhen Chen,Shipeng Geng,Yawen Wang,Yi Wang,Shuqin Song
H 2 O 2 production by 2 electron water oxidation reaction (2e - WOR) is a promising approach, but still lacks mechanistic studies especially from a dynamic point of view. The interfacial water behavior on the solid/liquid interface is believed to play a crucial role in WOR activity. Here, F modification was used to accommodate the structure and dynamic process of interfacial water on WO 3 surface and boost the 2e- WOR activity. Electrochemical measurement, Raman spectra and computational techniques were used to investigate the mechanism. F modification was proved to guide the dipole moments of interfacial water molecules towards WO 3 surface, meaning more difficult to flip interfacial water molecules to perform the first step of WOR, in turn resulting in easy desorption of HO* and O-O*, thus benefiting for 2 e - WOR. This work paves a novel insight to understand mechanism of 2 e - WOR and rationally design the electrocatalysts for H 2 O 2 production from water.
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高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 10
·2602-2612
·
IF 6.813
Haosheng Xin,Haiyong Wang,Song Li,Xiaohong Hu,Chenguang Wang,Longlong Ma,Qiying Liu
Catalytic conversion of renewable cellulose, instead of fossil resources, to high-value ethylene glycol (EG) is of great significance for reducing considerable worries regarding the energy problem. However, the EG production from cellulose is dependent on Ni and Ru based catalysts. Herein, encapsulated Co@C catalyst was firstly applied for EG production from cellulose combined with tungstic acid (TA). The mixing of the two catalysts in different ratios was compared and well-controlled, and the highest 67.3% yield of EG can be achieved. TA is used mainly to promote both the cellulose hydrolysis and the retro-aldol reaction of glucose to glycolaldehyde. Co@C catalysts are responsible for the hydrogenation of glycolaldehyde to EG. Compared with traditional noble metals and composite catalysts, the inexpensive and easily synthesized Co@C catalysts could greatly reduce the cost of production of EG. The Co@C catalysts encapsulated with outside graphene layers can keep high stability for at least 6 runs.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guang Yang,Chuanfan Yang,Fang Xia,Daming Hu,Joël Brugger,Barbara E. Etschmann,Jessica Hamilton,Hongfei Chen,Yanfeng Gao
Near-infrared (NIR)-shielding glasses for energy-saving window applications were prepared by forming sodium tungsten bronze-like (Na 5 W 14 O 44 ) functional units in the 29SiO 2 –43B 2 O 3 –28NaF glass matrix. The glasses were synthesized by a facile melt-quenching process where 4–8 mol.% H 2 WO 4 was added as the W source. The optimal glass was produced using 6 mol.% H 2 WO 4 , which had a low NIR transmission of 15.4% and a high visible light transmission of 59.8%. The possible mechanism for the formation of Na 5 W 14 O 44 in glasses were discussed based on XRD , Raman, XPS , XANES and EXAFS characterization of the glass samples, the glass samples after further crystallization, and the samples produced by staged heating of the starting materials. Crystalline or amorphous Na 5 W 14 O 44 formed during heating partially due to the protection by molten B 2 O 3 . Subsequently, amorphous Na 5 W 14 O 44 clusters are present in the glass acting as NIR-shielding functional units. This study sheds a light on further development of non-film-based and highly efficiency energy-saving windows.
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高影响因子
FUEL
·
2022
·
IF 8.035
Zhi Yang,Bowen Luo,Riyang Shu,Zhuojie Zhong,Zhipeng Tian,Chao Wang,Ying Chen
Hydrodeoxygenation (HDO) is an indispensable reaction in the field of fuel and chemical production, and the synergistic effect of metal–acid sites in the catalyst makes great influence to it. Herein, a bifunctional catalyst of Ru/C combined with phosphotungstic acid (HPW) was employed for the hydrodeoxygenation (HDO) of lignin-derived compounds to make full use of the synergistic effect of active metal–acid sites. HPW possessed a temperature-controlled phase-transfer behavior, which made it dispersed well on the surface of Ru/C catalyst and resulted in a close integration of acid site with metal site. Ru/C-HPW catalyst also owned the advantage of high reaction rate and good recyclability, which exhibited no obvious catalytic activity loss after 5 runs. Lignin-derived phenolic compounds including monomers and dimers enabled to obtain an efficient transformation to cycloalkanes at the temperature of 200 °C. Moreover, a high HDO reaction efficiency of raw lignin-oil was also observed in this study, with the increasing hydrocarbon content from 5.5% to 78.9%. This novel catalytic system can achieve a high HDO efficiency under mild conditions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhen Chen,Shipeng Geng,Juan Xiao,Fengyue Zhao,Kun Wang,Yi Wang,Panagiotis Tsiakaras,Shuqin Song
Herein, H 2 O 2 production activity via two-electron water oxidation reaction is identified on metal oxides (WO 3 , TiO 2 , and BiVO 4 ) in acidic SO 4 2− involving electrolyte, in which persulfate (PS) acts as an intermediate. A deep understanding of mechanism of PS production reaction on metal oxides has been realized based on rigorous crystal plane analysis of WO 3 and TiO 2 by combining density functional theory calculations and zeta potential measurements. It is found that the binding-energy of adsorbed hydroxyl groups on dominant exposed crystal plane of WO 3 is lower than that of TiO 2 , leading to more SO 4 2− adsorption sites at the surface of WO 3 . Consequently, the formation of PS on WO 3 surface is more favorable. Meanwhile, both SO 4 − · and OH· were detected in the electrolyte by electron paramagnetic resonance measurement, which play a crucial role in organic pollutants wastewater treatment, with a degradation efficiency of 96% in 90 min for a typical pollutant norfloxacin. This work can provide a novel insight for understanding the selectivity of water and SO 4 2− species oxidation on metal oxides, and open a new way for both on-site H 2 O 2 production and advanced oxidation processes application.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yiding Li,Qiang Zhang,Simin Shen,Siqi Wang,Liangliang Shi,Dequan Liu,Yujun Fu,Deyan He
Effectively limiting the shuttle effect is the key to improving the electrochemical performance of Li-S batteries. Here, the synthesis of WO 3 -WS 2 heterostructures is reported by electrospinning and in situ sulfurization strategies, combining the initial WO 3 nanoparticles with the sulfurization product WS 2 . It was found that the obtained bifunctional heterostructures enhance the electrolyte wettability, optimize intermediate regulation performance, accelerate Li + /e − diffusion, and thus exhibit excellent electrochemical characteristics in Li-S batteries. Through experiments and density functional theory (DFT) calculations, the WO 3 -WS 2 heterostructures were considered as a coupled creative solution with multiple advantages. Different from the batteries using single-component or single-configuration catalyst, the prepared Li-S batteries with the WO 3 -WS 2 heterostructures exhibited synergistic enhanced electrochemical performance and high-temperature crushing resistance. Even under severe conditions, including high sulfur loading (10.3 mg cm −2 ), lean electrolyte (5.8 μL mg −1 ), high current density (7.0 A g −1 ), extended cycling (1600 cycles), and high temperature (90 °C), the representative battery exhibited stable cycling performance.
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Qingdong Liao,Zhen Liu
Hexagonal tungsten oxide films were directly synthesized on fluorine-doped tin dioxide (FTO) coated glasses by the solvothermal method. The tungsten oxide films prepared by using glutaric acid as a self-crystallizing seeding agent and thiourea as a structural guide have a porous morphology with interwoven nanowires. The as-prepared films show excellent electrochromic performance in 1 M sulfuric acid, including 53 % optical modulation at 633 nm by applying ± 0.3 V, fast switching speed of 5 s for coloring and 2 s for bleaching, and high coloring efficiency of 144 C −1 cm 2 .
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高影响因子
危险品化学品经营许可证（带存储）