Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Zhiping Zhang,Yuenan Wang,Yang Lei,Fang Zhang,Xiaobing Chen,Hongfei Liu
Negative thermally expanded (NTE) (KMg) x Sc 2-x (WO 4 ) 3 (0 = x ≤ 1.5) ceramics have been prepared via solid-state reaction. X-ray diffraction (XRD) analysis reveals that (KMg) x Sc 2-x (WO 4 ) 3 undergoes a composition-induced phase transition as the (KMg) 3+ -substitution content increases. For x = 0.25, both hexagonal (KMg) x Sc 2-x (WO 4 ) 3 and orthorhombic Sc 2 (WO 4 ) 3 coexisted in the sample. For 0.25 < x ≤ 1, a single-phase, hexagonal (KMg) x Sc 2-x (WO 4 ) 3 , was obtained. When x is further increased to 1.25, monoclinic MgWO 4 impurity was detected in the sample. Meanwhile, as x increases, the grain size of (KMg) x Sc 2-x (WO 4 ) 3 ceramics grows up. Hexagonal (KMg) x Sc 2-x (WO 4 ) 3 ceramics show high densification and strong NTE property. Thermomechanical analysis indicates that the linear coefficients of thermal expansion (CTEs) of hexagonal (KMg) x Sc 2-x (WO 4 ) 3 ceramics decrease from −7.48 × 10 −6 °C −1 to −14.06 × 10 −6 °C −1 with the increase of x. High-temperature XRD analysis reveals that hexagonal (KMg) 0.5 Sc 1.5 (WO 4 ) 3 show an anisotropic NTE. The intrinsic linear CTEs are α a = α b = −6.74 × 10 −6 °C −1 , α c = 11.03 × 10 −6 °C −1 and the volumetric CTE is α v = −2.52 × 10 −6 °C −1 .
研究领域:
材料科学
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无机非金属材料
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功能陶瓷
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热学性能
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结构与物性
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 31
·19968-19978
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IF 10.7
Zicheng Huang,Wenjie Shao,Yijuan Zheng,Junyu Wang,Mao Wang,Shuang Li,Xiaohui Xu,Chong Cheng,Changsheng Zhao
Transition metal oxide-based catalysts are known as the most active oxygen evolution reaction (OER) catalysts due to their intrinsic electronic structures and binding strength of oxygenated intermediates. However, even the most active transition metal oxide-based OER catalysts have a turnover frequency far lower than that of the oxygen-evolving complexes in biological systems for intermolecular site aggregation. Herein, we implement the hybridization of a metal–organic framework and tungstic acid (WO3·xH2O-in-MIL-88) to achieve ordered FeNi site isolation at the molecular level and avoid intermolecular decomposition during the catalysis process. The optimized hybrid with 15% tungstic acid (15%-WO3·xH2O-in-MIL-88) achieves a much-enhanced OER activity and stability in terms of a low overpotential of 263 mV to reach a current density of 10 mA cm−2, a low Tafel slope of 39 mV dec−1, and long-term stability, which is much superior to that of the commercial RuO2 catalyst.
研究领域:
材料化学
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电化学
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催化化学
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能源科学
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无机化学
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DOI
高影响因子
POLYMER
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2023
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IF 4.6
Peng Wei,Dong Huang,Chen Luo,Yang Sui,Xi Li,Qingkun Liu,Bensheng Zhu,Chuanbo Cong,Qiong Zhou,Xiaoyu Meng
Due to its uncomplicated manufacturing procedure for large-scale industrialization and adaptable conductivity, the competitive proton exchange membrane (PEM) matrix employed is sulfonated poly (ether ether ketone). However, the conflict between the strong proton conductivity and high stability of SPEEK-based PEM constantly upsets the equilibrium; the primary chain of SPEEK will conduct more protons if additional sulfonic acid is introduced, but it also causes a high swelling ratio and lowers stability. To tackle this challenging issue, we coupled the high intrinsic proton conductivity of phosphotungstic acid (HPW) and the excellent stability of polyimide (PI) nanofibers in a single PEM. In particular, sandwich-structure hybrid membranes (PI/SPEEK + HPW) were created to reduce HPW loss under operational conditions, further improving stability. Consequently, the swelling ratio and conductivity of the premium sandwich-structure PI/SPEEK + HPW-20 were 29% and 223.4 mS cm −1 under 60 °C and 100% RH, their respective values were 8% larger than those of SPEEK. Its proton conductivity reached 170.9 mS cm −1 during 13 days of exposure under 60 °C and 100% RH, which would be 30% better than that of SPEEK over the same treatment. Protons in these membranes were transported through Grotthus and vehicle mechanism, and the establishment of an acid-rich layer at the surface among PI nanofiber with HPW/SPEEK, which was confirmed by FTIR, XPS , and TEM , is responsible for these superior performances. From our point of view, our findings might encourage more studies into the creation of high-performance PEM.
研究领域:
材料科学
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高分子化学
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能源材料
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电化学
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膜科学与技术
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
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IF 4.507
Haonan Qu,Bingyi Liu,Guohua Gao,Yiming Ma,Yanmei Zhou,Hua Zhou,Li Li,Yonghong Li,Shengjian Liu
Levulinic acid (LA) is a versatile key building block in the conversion of carbohydrates and it is an important basic chemical with various potential uses. MIL-100(Fe) loading with insoluble lysine functionalized phosphotungstic acid (Lys-PM 2 ) as heterogeneous catalysts have been synthesized for the conversion of glucose to LA in water. The optimized yield of LA is obtained by using Lys-PM 2 to catalyze glucose conversion is comparable to the majority of effective catalysts. The highest yield of LA (57.9%) is obtained at 150 °C for 9 h with 100 mg glucose and 25 mg Lys-PM 2 , since the Brønsted acidity and Lewis acidity of Lys-PM 2 . And the catalyst is able to recycle at least four times. It demonstrates the potential of Lys-PM 2 for the conversion of biomass.
研究领域:
催化化学
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绿色化学
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生物质能源
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有机转化
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材料化学
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可持续化学
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DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Chen Haojie,Gao Rui-Ting,Wang Lei,Wu Limin
Photoelectrochemical bipolar systems enable bias-free H 2 O 2 synthesis by integrating light harvesting, water oxidation and oxygen reduction. However, poor selectivity due to competing 4e - pathways, slow charge transfer, and inferior stability severely limit their practical application. Herein, we present a bias-free photoelectrochemical bipolar system for H 2 O 2 production, which integrates a Zn-TiO 2 /BVO/WO 3 photoanode for the 2e - water oxidation reaction and a Ru:CuO/Nb-CBO photocathode for the 2e - oxygen reduction reaction. The photoanode suppresses *OOH intermediates to favor H 2 O 2 formation, achieving a Faradaic efficiency (FE) of 90.2% at 0.6 V RHE . The photocathode stabilizes *OOH intermediates and delivers an FE of 91.9% under the same conditions while maintaining performance for over 50 h. Practical testing under natural sunlight with 36 cm 2 electrodes achieves an FE of 163.37% and a yield of 11.44 mmol L −1 . In situ generated H 2 O 2 achieves over 99% bacterial inactivation within 60 min. This work provides an adaptive platform for solar-driven H 2 O 2 synthesis and energy conversion.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Zhenzhen Yu,Liangwu Zhu,Dexi Yu,Baoying Yang,Wei Lin,Yidong Hou,Masakazu Anpo,Jimmy C. Yu,Jinshui Zhang
Pretreating WO 3 with H 2 O 2 solution (WO 3 -H 2 O 2 ) efficiently reduces the W-O coordination number on its surface. • Low-coordination site significantly lowers energy barrier for photoinduced oxygen vacancy (OV) formation. • Sufficient OVs are rapidly generated on the surface of WO 3 -H 2 O 2 under visible light irradiation. • These in-situ evolved OVs exhibit excellent performance and superior stability toward photocatalytic aerobic oxidation. • This work provides a simple yet effective strategy to address the issue of surface OV healing. Engineering abundant oxygen vacancies (OVs) in metal oxides is a promising strategy for photocatalytic aerobic oxidation. However, OVs on metal oxide surfaces, such as those on WO 3 , are prone to healing during photocatalytic reactions, particularly under O 2 -rich working conditions, often resulting in a significant and irreversible loss of catalytic activity. Herein, we demonstrate that engineering low-coordination W-O sites onto the WO 3 surface through H 2 O 2 pretreatment can effectively lower the energy barrier for the OV formation, thereby facilitating the in-situ evolution of abundant photoinduced OVs during the reaction. These in-situ generated OVs exhibit superior performance and robust stability in the photocatalytic oxidation of benzene to phenol when using air as the oxidant. Our findings provide an efficient approach for developing OV-rich photocatalysts that maintain high stability and long-term performance in oxygen-involved photocatalytic reactions. Download: Download high-res image (153KB) Download: Download full-size image
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 13
·4200-4206
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IF 4
Jianxin Lv,Linghui Zhang,Lianxi Si,Hui Li,Wenbo Zhao,Fei An,Xia Feng,Shi Hu
Materials with accurate and durable gas detection are essential for gas sensors. We developed a facile and effective method to deposit Pd onto WO3 nanosheets and used the samples for hydrogen gas sensing. The combination of the 2D ultrathin nanostructure of WO3 and the spillover effect of Pd enables a detection concentration down to 20 ppm of hydrogen and high selectivity against other gases including methane, butane, acetone, isopropanol, etc. Moreover, the durability of the sensing materials was testified through 50 cycles of exposure to 200 ppm of hydrogen. These outstanding performances are mainly attributed to a homogeneous and tenacious decoration of Pd on the surface of WO3 nanosheets, providing an attractive choice for practical applications.
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 17
·8391-8398
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IF 3.3
Penghui Li,Huixiang Wang,Junhua Gao,Liancheng Wang,Jing Shi,Yu Meng,Junfen Li,Baoliang Lv
Supported tungsten oxide catalysts are promising candidates for olefin epoxidation with hydrogen peroxide (H2O2). Understanding the structure–activity relationship is of great importance for developing more efficient tungsten oxide-based catalysts. Herein, WO3–SBA-15 with an isolated tetrahedron WO4 is synthesized using a direct incorporation strategy, and its TOF is 191 h−1 in cis-cyclooctene epoxidation with H2O2, which is much higher than that of WO3/SBA-15 (51 h−1) prepared using an impregnation method and that of bulk-WO3 (0.4 h−1). Its lowest apparent activation energy of 34.6 kJ mol−1 also corresponded to the remarkable performance of WO3–SBA-15. Kinetic analysis indicated that WO3–SBA-15 bound H2O2 more strongly than other catalysts, resulting in the facilitated activation of H2O2. By correlating the specific activity and the structure characterization, we considered that the high reactivity of WO3–SBA-15 was attributed to (i) more isolated WO4 sites, which were of benefit to the coordination and activation of H2O2 and (ii) a stronger metal–support interaction derived from isolated WO4 species, which favored the dissociation of an O–O bond in the W–OOH intermediate and contributed to the insertion of an oxygen atom into an olefin double bond. Furthermore, DFT calculations indicated that the isolated tungsten oxide was beneficial for lowering the energy barrier of electrophilic oxygen atom transfer, thereby facilitating epoxidation.
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Ziyu Jia,Jun Hu,Ping Lu,Yahui Sun,Yunjun Wang
Herein, using Ru/C and H 2 WO 4 as the catalysts, native lignin in biomass was efficiently depolymerized into monophenols following the lignin-first strategy at mild conditions. Upon the co-presence of Ru/C and H 2 WO 4 , birch lignin afforded monophenols in 40.4 wt% yield at 200 °C, which was 2.5 times that upon Ru/C and 7.5 times that upon H 2 WO 4 . 4-Propylsyringol and 4-propylguaiacol were two major products with a combined selectivity of 73%. 2D HSQC NMR of liquid product reveals that β-O-4 bonds in the soluble lignin fragments had been thoroughly disrupted. H 2 WO 4 dissolving at high temperatures promoted the solvolysis of lignin from the biomass matrix, and Ru/C enhanced the following reductive depolymerization. The solid catalysts can be readily recovered for reuse at room temperature after the hydrolysis of carbohydrates, and the catalysts exhibited high activity after four recycles.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Guang Yang,Yongwei Liu,Chuanfan Yang,Fang Xia,Yupeng Wu,Yaroslav Shpotyuk,Viktor Takats,Huidan Zeng,Yinsheng Xu,Hongfei Chen,Yanfeng Gao
This work presents the influence of glass matrix SiO 2 –B 2 O 3 –NaF on the formation of near-infrared (NIR)-shielding functional units in energy-saving glass windows. The structural analyses by XRD , XPS , and Raman confirmed that the NIR-shielding performance is insensitive to SiO 2 or B 2 O 3 glass network formers but is significantly impacted by the concentration of NaF. This is because the presence of a reasonable amount of NaF provides the much-needed sodium for the formation of NIR-shielding functional units Na 5 W 14 O 44 but too much NaF (>22 mol.%) can inhibit the formation of Na 5 W 14 O 44 by transforming the W– O –W chain in the interconnected [WO 6 ] and [WO 4 ] polyhedrons into W–O - bonds. By adjusting NaF to the optimal level (16 mol.%) and adding only a small amount of H 2 WO 4 (1.9 mol.%) as the tungsten source in the raw materials, excellent optical properties and thermal insulation performance have been achieved in the produced bulk glass, with a high transmission of 65.8% at 550 nm in the visible light region and a low transmission of 6.6% at 1550 nm in the NIR region. This performance is much better than soda lime glass and ITO glass and is comparable to cesium tungsten bronze-based membrane coated glass. This study paves a way for glass composition design to achieve high NIR-shielding performance with the minimum amount of tungsten source, leading to cost-effective glass fabrication and enhanced mechanical strength of energy-saving glass windows.
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产品关联
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xingrui Tong,Jinhui Wang,Ping Zhang,Pengyang Lei,Yi Gao,Ruirui Ren,Siyu Zhang,Rui Zhu,Guofa Cai
Tungsten trioxide (WO 3 )-based electrochromic devices have attracted great interest in smart windows, low-power displays, and other cutting-edge fields. The electrochromic behavior of WO 3 is strongly dominated by both electron conduction and ion diffusion process. Nevertheless, the structure–activity relationship of the WO 3 in the electrochromism has not been well elucidated so far. Herein, we systematically studied the relationship between the crystal structure composed of the fundamental units of typical WO 3 and the electron conduction/ion diffusion processes at a sub-nanoscale level. Our theoretical results unveil that the h-WO 3 with appropriate band gap by piling up the WO 6 octahedral molecular units along c axis profit electron conduction, and the continuous three-, six-ring tunnels along ab plane built by the units are conducive to ion diffusion. Therefore, the h-WO 3 film exhibits large optical modulation (up to 86% at 633 nm and 90% at 1000 nm), excellent cycling stability (86.4% of retention over 3000 cycles), and fast switching speed (1.9 s of bleaching time at 633 nm). Moreover, we provide unique insights between H + adsorption/desorption and the electrochromic response in the near-infrared region. We believe that this study lays a foundation for the design and construction of high-performance electrochromic nanomaterials and broadband tunable smart windows.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guang Yang,Yongwei Liu,Chuanfan Yang,Fang Xia,Daming Hu,Yupeng Wu,Yaroslav Shpotyuk,Viktor Takats,Xiaoyan He
NIR-shielding window materials were fabricated by direct embedding of Ta 0.3 W 0.7 O 2.85 nanocrystals in bulk borosilicate glass-ceramics during a facile melt-quenching process. Optical and thermal performance of the prepared windows can be adjusted by varying the concentration of H 2 WO 4 and Ta 2 O 5 in the starting materials. The optimized window fabricated from raw materials containing 4.5 mol% H 2 WO 4 and 0.3 mol% Ta 2 O 5 exhibited high visible light transmittance 74.4% and strong NIR-shielding ability ΔT = 68.9%. Its thermal insulation performance is much better than soda lime glass or ITO glass, and its visible light transmission is higher than cesium-tungsten-bronze-based film coated glass. The distribution of Ta 0.3 W 0.7 O 2.85 functional nanocrystals in the glass matrix was confirmed by sample characterization using XRD, Raman, XPS, HRTEM and EDS. The NIR-shielding property has been attributed to local surface plasmon resonance due to oxygen vacancies in the Ta 0.3 W 0.7 O 2.85 nanocrystals. This study sheds a light on fabricating energy-saving windows with a tunable NIR-shielding performance.
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高影响因子
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