APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Wanli Liang,Mengyan Zhou,Xinyi Lin,Jinchang Xu,Pengyu Dong,Zhichen Le,Muzi Yang,Jian Chen,Fangyan Xie,Nan Wang,Yanshuo Jin,Hui Meng
Hydrogen is considered as an efficient energy alternative, and the use of offshore wind power to electrolyze seawater to produce hydrogen will become the future model. Here, nickel-doped tungsten oxide is proposed to realize hydrogen production from seawater. Ni-WO x @NF was prepared experimentally, in which Ni was doped into WO x to replace part of the W sites. There is a volcanic relationship between the amount of Ni doping and the activity of the hydrogen evolution reaction. Particularly in alkaline seawater, Ni-WO x @NF only needs an overpotential of 45.69 mV to reach a current density of 10 mA cm −2 and exhibits stability over 120 h. In addition, theoretical calculations confirmed that Ni doping can optimize the activity of hydrogen evolution reaction. This work proposes that nickel doping can enhance the hydrogen evolution reaction activity of tungsten oxide with excellent corrosion resistance, enabling it to work efficiently and stably in alkaline seawater.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2023
·Vol. 11
·期 40
·13752-13762
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IF 6.4
Yuanze Meng,Jialun Li,Xijia Yang,Yang Gao,Xuesong Li,Liying Wang,Wei Lü
Poly (3,4-ethylenedioxythiophene): poly (4-styrenesulfonic acid) (PEDOT:PSS) is a kind of widely used polymer with excellent electrical conductivity. In this study, PEDOT:PSS was modified to achieve self-healing ability while maintaining excellent energy storage properties. The modified PEDOT:PSS hybrid film demonstrated instantaneous self-healing ability due to physical cross-linking after being subjected to different external cuts (the average self-healing time was 1.44 s). When pressed at different rates, the film had a self-healing time of less than 0.12 s, and a retention rate of 74% after pressing 1750 times consecutively at a rate of 8.6 cm s−1. The mechanism of self-healing was investigated using theoretical calculations. Tungsten trioxide (WO3) was further introduced into the PEDOT:PSS hybrid film to fabricate electrochromic energy storage devices (EESDs), achieving a specific capacitance of 105.35 mF cm−2 and a capacitance retention of 98.2% after 1000 cycles. In the organic/inorganic hybrid system, the modified PEDOT:PSS film acted as both a protective coating for WO3 and exhibited a synergistic color change with WO3, ultimately improving the overall performance of the device. The present self-healing strategy can help design restorers for EESDs and can be extended to other new rechargeable electrochromic battery systems with good application prospects.
研究领域:
材料科学
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能源技术
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电子工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Qingqing Liu,Chaofan Hu,Xiaomin Wang
Tungsten oxide has attracted considerable attention as a typical photochromic material. Herein, a simple route for the synthesis of tungsten oxide quantum dots (WO 3-x QDs) was demonstrated which was accomplished by the hydrothermal treatment of ammonium tungstate hydrate in the present of polyvinyl pyrrolidone (PVP). This photochromic material can rapidly undergo a color change reaction under the irradiation of ultraviolet or solar light. More importantly, the bleaching can be completed in a dark environment for 5 min and the cycle stability is excellent. The ultra-small size, existence of oxygen deficiency, and the surface modification by PVP are attribute to fast photochromic performance, excellent reversibility and cycling stability of WO 3-x QDs.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Jie Dang,Yijie Wu,Zepeng Lv,Xuewei Lv
Tungsten carbides , which can be widely used as cutting and drilling tools, chemical catalysts and aerospace coatings, have attracted widespread attentions. The present work reported a simple method to prepare tungsten carbides by using WO 2 as the raw materials and CO as the reduction and carbonization agent. It was found that at lower and moderate temperatures, all the final product was WC, while at higher temperatures, the final products were W 2 C or W. The reduction and carbonization mechanism was also studied theoretically and experimentally. WO 2 was reduced and carburized to WC in one step at lower temperatures; WO 2 was first reduced and carburized to W 2 C and then to WC at moderate temperatures; while at higher temperatures, WO 2 was first reduced to metallic W and then carbonized to WC or W 2 C, but with the temperature increasing, the carbonization became difficult and required much higher CO content.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
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2021
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IF 9.676
Guojuan Hai,Jianfeng Huang,Liyun Cao,Koji Kajiyoshi,Long Wang,Liangliang Feng,Jun Chen
The electrochemical conversion is closely correlated with the electrocatalytic activities of the electrocatalyst. Herein, the urchin-like Ni-doped W 18 O 49 /NF with enriched active sites was prepared by solvothermal method followed by a low-temperature pyrolysis treatment was reported. Results demonstrate that the incorporation of Ni-doping triggers the lattice distortion of W 18 O 49 for the increasement of oxygen defects. Further, high-valent W 6+ are partially reduced to low-valent W 4+ , wherein the electrons originate from the oxidation process of Ni 2+ to Ni 3+ . The Ni 3+ ions show an enhanced orbital overlap with the OER reaction intermediates. The generated W 4+ ions contribute to release oxygen vacancies, eventually reorganizing Ni-doped W 18 O 49 /NF to unique electrochemical active species with a special amorphous-crystalline interface (AM/NiWO x /NiOOH/NF). Simultaneously, the reconstruction results in an optimized valence band and conduction band. Eventually, the resultant AM/NiWO x /NiOOH/NF with abundant active sites and improved oxidation/reduction capability exhibits more superior catalytic performance compared with the Ni-doped W 18 O 49 /NF counterpart. This study gives more insights in the electrochemical evolution of the tungsten-based oxide and provides effective strategies for optimizing the catalytic activity of materials with inherent hydrogen evolution reaction limitations.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Man Yang,Yuxiang Jiao,Jianglin Duan,Keying Wu,Hailiang Song,Shaodong Sun,Yujing Ren
Taking the background of the ambiguous role of oxophilic metal oxide in metal-acid bifunctional catalysts for the important field of tetrahydrofurfuryl alcohol (THFA) hydrogenolysis, a linear relationship between the W═O/W–OH content in sub-nano-Rh-supported WOx and 1,5-pentanediol (1,5-PeD) yields from THFA hydrogenolysis has been established. It reveals that the higher reduction temperature promotes the surface Rh/W ratio. Thus, hydrogen spillover is facilitated, leading to more surface W═O structures and thereby more in-situ-reduced W–OH generation. W–OH structures work as the active sites to provide in situ Brønsted acid, resulting in enhanced selective activation for secondary C–O bonds of THFA. This discovery reveals the unique role of the surface structure on oxophilic metal oxide in chemoselective hydrogenolysis of the secondary C–O bond in polyols.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Shihao Su,Xuyang Zou,Guojun Lv,Fuxin Wang,Yangbin Shen
Tandem catalysis reaction, which integrates two consecutive steps into a single one, can efficiently eliminate the separation of intermediate products, shortening the reaction time and decreasing energy expenditure. Therefore, the development of an efficient method for catalyzing tandem conversion of alkenes to prepare 1,2-diols is extremely fascinating. In this work, we reported the hydrothermal synthesis of tin-tungsten oxide catalysts at different pH values and their application as bifunctional catalyst for the one-pot tandem catalysis of alkenes to 1,2-diols. The SnWO 4 catalyst prepared at pH = 5 revealed the best tandem conversion performance and could attain a 95.4 % of cyclohexene conversion as well as a 77.2 % of 1,2-cyclohexanediol selectivity within 4 h of reaction. A possible mechanism corresponding to the tandem catalytic conversion of cyclohexene into 1,2-cyclohexanediol over SnWO 4 catalyst was proposed. Moreover, quenching experiments, density functional theory (DFT) calculations and in-situ infrared characterizations were further utilized to verify the reaction mechanism. Sn(II) could stabilize tungstate through the formation of W-O-Sn bonds and effectively reduced the energy of tungsten active centre binding to hydrogen peroxide, promoting the tandem catalysis reaction of cyclohexene to 1,2-cyclohexanediol. In addition, the one-pot tandem catalysis system could be further extended to the majority of linear and cyclic alkene substrates. This work can give a basis for the development of more green and efficient tandem conversion reaction of alkenes into 1,2-diols.
研究领域:
化学工程
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催化科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Yingdan Ye,Han Wang,Yibin Zhang,Huaiyuan Zhao,Weichen Du,Ping Chen,Zhaoyin Hou
Chemical upcycling of end-of-life plastics is an economically and environmentally feasible way to tackle plastics crisis. Among them, methanol alcoholysis of polylactic acid (PLA) is a promising approach, which can produce methyl lactate (MLA) that can be further converted to lactide to achieve a sustainable development. In this work, a series of WO x /ZrP catalysts with WO x active sites in low coverage and high surface area were synthesized via anchoring WO x species on the surface of zirconium phosphate (ZrP). Characterizations indicated that the strong interaction between WO x and ZrP promoted the formation of WO x active sites in low coverage. In particular, 10 %WO x /ZrP catalyst was highly active and stable for the alcoholysis of PLA plastics under mild conditions due to the abundant WO x active sites and strong acidity. The yield of MLA over 10 %WO x /ZrP catalyst reached 94.5 % within 4 h at 160 °C, which was superior to the performance of traditional solid acids ( α -ZrP, HZSM-5, H β and Amberlyst-45). In addition, 10 %WO x /ZrP was versatile for the alcoholysis of discarded PLA-based products and could be recycled at least five times. The prominent performance of 10 %WO x /ZrP catalyst and the possible reaction mechanism were discussed.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Discover Nano
·
2024
·Vol. 19
·期 1
·1-8
·
IF 0
Xiong Yuanpeng,Wu Bo,Lin Yuanzhi,Zhang Mingwen,Chen Jintian
In this study, a simple route for the synthesis of hierarchical W 18 O 49 assembled by nanowires is reported. The morphologies and formation of W 18 O 49 single-crystal could be controlled by changing the concentration of WCl 6 -ethanol solution. This synthesis strategy has the advantages that the hierarchical W 18 O 49 microspheres could be economic synthesized at 180 °C without adding additives. Furthermore, efficient optical absorption properties in ultraviolet, visible and near-infrared region were obtained for the hierarchical W 18 O 49 microspheres comparing with nanowires. These results will further promote the research of tungsten-based oxide nanomaterials. Graphical abstract
研究领域:
材料科学
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纳米技术
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产品关联
DOI
PubMed
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Yuanhang Feng,Zhao zhao,Ting Wang,Jiaming Li,Ming Xu,Hailiang Jiao,Chen Wang,Haibo Li,Ming Feng
Photocatalytic N 2 fixation is a promising and sustainable manufacturing process of ammonia (NH 3 ); however, the NH 3 production rate by this method is very low, thus severely restricting further application of this sustainable technology. Therefore, developing an efficient photocatalyst for N 2 fixation under mild conditions is urgently required. Herein, ferroelectric Bi 2 WO 6 materials with different surface oxygen defects were prepared, and the concentration of corresponding defects was controlled by adjusting the thermal reduction time. The abundant oxygen defects in Bi 2 WO 6 can provide more reactive sites to promote the effective adsorption of N 2 , and the photogenerated charge carrier can be efficiently separated benefiting from the internal electric field. These would weaken the N 2 triple bond and reduce the activation energy barrier for the conversion of N 2 to NH 3 under mild conditions. In the absence of sacrificial agents and cocatalysts, the optimized Bi 2 WO 6 with oxygen defects shows an indigenous NH 3 yield of 132.175 μmol·g -1 ·L -1 ·h -1 , which is more than two times higher than that of the original Bi 2 WO 6 . Surprisingly, the Bi 2 WO 6 with oxygen defects produced more than eight times NH 3 (471.13 μmol·g -1 ·L -1 ·h -1 ) than that of the original Bi 2 WO 6 when assisted by an external magnetic field, thus providing a new perspective for further enhancing the N 2 fixation performance.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Xuesong Zhao,Shaobin Huang,Ying Liu,Qianyu Liu,Yongqing Zhang
In the present study, we prepared novel polyaniline supported W 18 O 49 (PANI/W 18 O 49 ) nanocomposite by in situ oxidative polymerisation method. We herein focused on enhancing the stability and the photocatalytic performance of W 18 O 49 . The prepared PANI/W 18 O 49 was thoroughly characterized by FTIR, TEM, XRD, BET, UV–vis DRS and PL. The PANI support presented a great effect on the light harvesting and photo-charge transfer of the W 18 O 49 , and the optimum percentage of was found to be 10 wt%. As for treating Cr(VI), the effect of important water quality parameters (such as pH, ions, NOM, DO, temperature and SOAs) on photocatalytic performance was investigated under the visible light irradiation (λ > 420 nm). SOAs were shown to exert a dramatic accelerating influence on Cr(VI) reduction in the system. The obtained 10%-PANI/W 18 O 49 can completely catalytically reduce 1 mM Cr(VI) in the presence of tartaric acid (1:3) within 50 min. Meanwhile, it can be recycled at ten times without any loss of photocatalytic efficiency, indicating the high stability of the as-prepared photocatalyst. The results of the study demonstrate the potential of the new obtained photocatalyst in efficient utilization of solar energy for treating aqueous Cr(VI).
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 22
·5487-5494
·
IF 4.495
Xia Yang,Chun Li,Jiangfei Wang,Jing Zhang,Fangfang Wang,Rengui Li,Can Li
Graphical On the tip of my tung : A novel bismuth tungstate nanosheets photocatalyst dispersed by graphene is fabricated through PVP assisted assembly of Bi 2 WO 6 nanostructures and simultaneously reduced graphene oxide. The well dispersion of Bi 2 WO 6 nanosheets by graphene provides enhanced separation/transfer of photogenerated charges and exposed active sites for interfacial charge transfer, giving enhanced visible light photocatalytic activity compared with other similar photocatalysts. Promoting photogenerated charge separation is the key and bottleneck step in photocatalysis, which mainly determines the efficiency of solar energy conversion. Reduced graphene oxide (rGO) has been emerging in the fields of physics, catalysis and material sciences due to its unique structures, high catalytic activity and tunability. In this work, we introduced rGO nanosheets as support to fabricate uniformly-dispersed Bi 2 WO 6 nanostructures onto the rGO surface under hydrothermal condition. The resulted rGO/Bi 2 WO 6 composite exhibited superior performances in degradation of various kinds of environmental pollutants including dyes and phenol. Further electrochemical characterizations including open circuit potential, electrochemical impedance spectroscopy and electrochemical specific area indicated that incorporation of rGO evidently accelerated the interfacial charge separation and transfer. These improvements consequently contributed to largely exposed active sites and superior photocatalytic performance. Our work presented a facile strategy to tune the interfacial charge separation in semiconductor-based photocatalysts using layered materials like graphene and its derivatives.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
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