ACTA PHYSICO-CHIMICA SINICA
·
2023
·
IF 10.9
Ruijie Zhu,Leilei Kang,Lin Li,Xiaoli Pan,Hua Wang,Yang Su,Guangyi Li,Hongkui Cheng,Rengui Li,Xiao Yan Liu,Aiqin Wang
Catalytic oxidation is a commonly employed technology in the industry for removing volatile organic compounds (VOCs) due to its exceptional efficiency under mild operating conditions. Although supported Pt-based nano-catalysts are recognized widely as one of the most promising and extensively used industrial catalysts for VOC abatement, their practical application, and development are restricted by their exorbitant cost. Single-atom catalyst (SAC) with maximized metal utilization and exclusive electronic character has been explored extensively in various catalytic reactions. However, Pt SAC is usually deemed to be inactive in hydrocarbon oxidation reactions in thermal catalysis, compared with its nanoparticle counterpart. Here, we demonstrate that the WO 3 -TiO 2 supported Pt SAC (Pt 1 /WO 3 -TiO 2 ) exhibits much higher activities than the corresponding nanoparticle catalyst (Pt NP /WO 3 -TiO 2 ) in photo-thermo catalytic oxidation of C 3 H 8 and C 3 H 6 , which represent different kinds of typical VOCs. A key finding is that the activities of Pt 1 /WO 3 -TiO 2 and Pt NP /WO 3 -TiO 2 can be accelerated in photo-thermo catalytic C 3 H 8 oxidation by overcoming oxygen poisoning. Upon the light irradiation, the apparent active energy ( E a ) of the Pt 1 /WO 3 -TiO 2 and Pt NP /WO 3 -TiO 2 decline from 116 to 60 kJ·mol −1 and from 103 to 30 kJ·mol −1 , respectively, substantiating their effectiveness in photo-thermo catalysis. Notably, a substantially higher reaction rate of 3792 μmol∙g Pt −1 ∙s −1 on the Pt 1 /WO 3 -TiO 2 is achieved, which should be a benchmark for C 3 H 8 oxidation. More intriguingly, photo-thermo catalytic C 3 H 6 oxidation on the Pt NP /WO 3 -TiO 2 is prohibited due to the strong adsorption-induced C 3 H 6 poisoning on the Pt nanoparticles, for which the E a of the Pt NP /WO 3 -TiO 2 catalyst for C 3 H 6 oxidation is maintained at approximately 55 kJ·mol −1 , regardless of the light irradiation. In comparison, the C 3 H 6 poisoning on the Pt 1 /WO 3 -TiO 2 can be mitigated by light illumination, where the E a of the Pt 1 /WO 3 -TiO 2 catalyst for C 3 H 6 oxidation dramatically reduced from 49 to 16 kJ·mol −1 , signifying that the high energy barrier of C 3 H 6 oxidation can be mediated by the light. Profiting from the apt affinity between C 3 H 6 and Pt single atoms, the photogenerated electrons accumulated on the Pt single atoms produce repulsive force towards the electron-rich C 3 H 6 molecules, which is conducive to the C 3 H 6 desorption from the Pt 1 /WO 3 -TiO 2 . Therefore, the Pt 1 /WO 3 -TiO 2 exhibits enhanced activity in photo-thermo catalytic C 3 H 6 oxidation. This study exemplifies that the advantages of SAC are not only saving the consumption of precious metals but also discovering new catalytic reactions on the account of the specific electronic characteristic. Download: Download high-res image (85KB) Download: Download full-size image
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Cunbiao Song,Guitai Wu,Beilei Sun,Yao Xiong,Sheng Zhu,Yongming Hu,Haoshuang Gu,Yu Wang,Wanping Chen
Pt–WO 3 porous composite ceramics have been prepared from Pt and WO 3 nanoparticles through pressing and sintering. These ceramics exhibit extraordinary room-temperature sensing capabilities, including high sensitivities, fast response and recovery speeds, and good stability, for low concentrations of hydrogen (at and below 1000 ppm) in air; while for high concentrations of hydrogen (above 2000 ppm) in air, the recoveries in air are only partial in given amounts of time. We propose that for low concentrations of hydrogen, the response results from the reaction of hydrogen with chemisorbed oxygen on WO 3 ; while for high concentrations of hydrogen, hydrogen chemisorption on WO 3 will occur after all chemisorbed oxygen on WO 3 is reacted. The relatively high stability of chemisorbed hydrogen on WO 3 is responsible for the observed partial recoveries. Our results show that Pt–WO 3 composite ceramics are highly competitive for sensing low concentrations of hydrogen in air at room temperature among various metal oxide semiconductor bulk materials.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Zhiyang He,Qiao Liu,Huilin Hou,Fengmei Gao,Bin Tang,Weiyou Yang
In this work, polycrystalline WO3 nanobelts were fabricated via an electrospinning process combined with subsequent air calcination. The resultant products were characterized by X-ray diffraction, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy in regard to the structures. It has been found that the applied voltage during the electrospinning process played the determined role in the formation of the WO3 nanobelts, allowing the controlled growth of the nanobelts. The ultraviolet (UV) photodetector assembled by an individual WO3 nanobelt exhibits a high sensitivity and a precise selectivity to the different wavelength lights, with a very low dark current and typical photo-dark current ratio up to 1000, which was the highest for any WO3 photodectectors ever reported. This work could not only push forward the facile preparation of WO3 nanobelts but also represent, for the first time, the possibility that the polycrystalline WO3 nanobelts could be a promising building block for the highly efficient UV photodetectors.
研究领域:
材料科学
·
光电检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Lei Chen,Ding Weng,Jiadao Wang,Duan Weng,Li Cao
The CeO 2 -TiO 2 (CeTi) and CeO 2 /WO 3 -TiO 2 (CeWTi) catalysts were prepared by a sol-gel precipitation method and their NH 3 -NO/NO 2 selective catalytic reduction (SCR) performance was studied. N 2 O formation and effect of oxygen concentration on SCR performance over CeWTi catalyst were also investigated while varying the NO 2 /NO x ratio. Results indicate that fast SCR behavior of CeWTi catalyst has the best NH 3 -NO/NO 2 SCR performance due to the catalyst reoxidation rate by NO 2 higher than by O 2 . Compared with CeTi catalyst, CeWTi catalyst exhibits higher de-NO x performance under NH 3 -NO/NO 2 SCR conditions. As the CeTi and CeWTi catalysts exhibit similar redox property, addition of WO 3 provides more acid sites which accelerate the reaction between NH 4 NO 3 and NO to get a superior low-temperature activity. Amount of N 2 O formation shows a peak at 250 °C mainly derived from NH 4 NO 3 decomposition.
研究领域:
催化劑科學
·
環境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Xue Wang,Li-Yuan Wang,Cheng-Bao Yao,Ze-Miao Wang,Yu Liu,Cai-Hong Jiang
The metal/metal oxide semiconductor materials with special photoelectric properties have been widely used for the development of novel photoelectric devices. However, electron transfers at the interfaces of metal and metal oxide are unclear under a photoexcitation process. Herein, the pure WO3 nanorods and Ag nanoparticles (NPs)-loaded WO3 (AWO) nanorods were synthesized by a hydrothermal technique and a two-step method, which includes hydrothermal and magnetron processes. Their corresponding electron excitation and relaxation properties have been revealed by absorption/emission spectra and transmission curves under nonlinear excitation of an ultrafast laser. The dependence relationship for the morphology and structure of one-dimensional (1D) WO3 nanomaterial orientation on the parameters’ adjustment (reaction time and reactant concentration) and formation mechanism was studied. The 1D WO3 nanomaterials show obvious longitudinal growth in the (200) orientation, as well as lateral growth in the (001) and (110) orientations. The size and distribution effects of Ag NPs on the optical properties of WO3 have also been investigated. On the basis of quantum particle coupling between metal (Ag) and metal oxide materials (WO3 nanorods), electron–hole pairs were generated in the semiconductor and strongly enhanced the radiative recombination. The Z-scan results illustrated that the maximum nonlinear absorption coefficient of the AWO (6 W) nanorods was obtained. When charge transfer happens in Ag NPs, the density of the electronic states in the excited/defect states of the WO3 can be regulated. For AWO nanorods, the ground state of Ag undergoes a saturation absorption process and results in reverse saturation absorption of the excited/defect states. Because of their remarkable nonlinear-optical properties, the proposed AWO nanorods will be potential nanocomposite materials for the development of nonlinear absorption modulator devices.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jichao Shang,Mingyue Zhou,Fuwei Xie,Shuqi Li,Shiyu Tu,Xiangrui Liu,Lu Zhang
As a prevalent volatile organic compound (VOC), acetone plays a significant role in diverse domains, such as environmental protection, industrial production, and medical diagnosis. However, if acetone is not adequately monitored and disposed of, it can result in immeasurable adverse effects on human health and the natural environment. Therefore, it is essential to realize the highly sensitive, convenient, and efficient real-time detection of acetone. In this study, MoS2 quantum dots (QDs) were modified on flower-like WO3 nanorod structure through the hydrothermal approach to fabricate a WO3/MoS2 sensor. The sensing performance of the sensor for acetone was investigated. The results showed that the sensor had a response value of 14.96 for 30 ppm of acetone gas at optimum operating temperature (132 °C), which was 3.2 times the performance of a pure WO3 gas sensor. The response of the WO3/MoS2 sensor was reduced by only 20% under a relative humidity of 85%. Besides, the sensor still maintained a high response (11.25 for 30 ppm) under high curvature conditions (120°). Finally, the sensitization effects of MoS2 QDs, including the formation of n-n heterojunction with WO3 and the catalytic overflow of oxygen species, were discussed in detail. This study provides a valuable reference for the construction of low-temperature and high-performance gas sensors based on QD-sensitized metal oxide nanomaterials.
研究领域:
材料科学
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传感器技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 6
·2505-2514
·
IF 2.7
Zeyu Guan,Yuxiao Weng,Jiankun Li,Shiyi Li,Keyu Wang,Linfeng Lei,Yixing Wang,Linzhou Zhuang,Zhi Xu
Proton exchange membrane water electrolysis (PEMWE) can be coupled with renewable energy power generation technology and is considered to be a highly promising hydrogen production technology. However, the acidic electrolyte environment, as well as the numerous sulfonic acid groups on the proton exchange membrane surface, can seriously corrode the oxygen evolution reaction (OER) catalyst and even cause deactivation. To develop an efficient acidic OER catalyst, the IrOx/WO3 heterostructure OER catalyst was prepared by a hydrothermal-calcination method. The coordination environment of IrOx was regulated through the electronic rearrangement effect, improving the OER activity and stability of the catalyst in acidic media. The prepared IrOx/WO3 exhibits excellent OER activity in 0.5 M H2SO4, with an overpotential of only 260 mV to achieve a current density of 10 mA cm−2 and a mass activity of 176.8 A gIr−1. It can stably operate for over 12 hours at a current density of j = 10 mA cm−2.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Gehong Zhang,Weisheng Guan,Hao Shen,Xian Zhang,Weiqiang Fan,Changyu Lu,Hongye Bai,Lisong Xiao,Wei Gu,Weidong Shi
In our work, we have successfully synthesized WO3 nanosheets via a simple, fast, and organic additives-free hydrothermal method. The obtained products are 200–500 nm-sized with square corners and high crystallinity. A possible formation mechanism of WO3 nanosheets is discussed in this study based on the experimental results and our understanding. WO3 nanosheets modified with Pt exhibit enhanced photocatalytic activity of tetracycline compared with bare WO3 nanosheets under visible-light irradiation (λ > 420 nm). Furthermore, the effects of Pt as cocatalyst can be clearly drawn, and the degradation ratio of 2% Pt/WO3 nanosheets is over 3 times that of bare WO3 nanosheets, which is reasonable to expect the obvious Pt-dependent activity. The addition of 10 mL of iso-propanol leads to a considerable decreased degradation ratio (DR) of tetracycline (TC) on 2% Pt/WO3 photocatalysts, further indicating the ·OH radicals do exist in the process of the photocatalytic oxidation (PCO) of TC.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2019
·Vol. 39
·期 7
·841-849
·
IF 1.785
Zhang Yi-Fei,Zhu Yu-Kun,Lv Chun-Xiao,Lai Shou-Juan,Xu Wen-Jia,Sun Jin,Sun Yuan-Yuan,Yang Dong-Jiang
A heterojunction photoanode of Fe 2 O 3 loaded on a WO 3 film on a fluorine-doped tin oxide substrate (FTO-WO 3 /Fe 2 O 3 ) was prepared via a simple hydrothermal and chemical vapor deposition (CVD) growth method. The photoanode showed higher photoelectrochemical (PEC) water-splitting activity than that of the pristine FTO-WO 3 under simulated sunlight because of the synergistic effect of Fe 2 O 3 and WO 3 . The as-synthesized material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The photocurrent density was estimated by linear sweep voltammetry and further confirmed using intensity-modulated photocurrent spectra. Experiments demonstrated that the coated Fe 2 O 3 enhanced the separation and migration efficiencies of the photoinduced electrons and holes, improving the PEC water-splitting properties. The FTO-WO 3 /Fe 2 O 3 photoanode showed a 1.25 times enhancement in photocurrent density compared with FTO-WO 3 . This result suggests that facile chemical vapor deposition growth is an effective way to fabricate heterojunctions and improve the properties of WO 3 photoanodes for PEC water-splitting applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jingsong Han,Yue Li,Liming Yang,Tingting Li,Yan Luo,Lixia Yang,Shenglian Luo
The suitable doping or modification on TiO 2 holds promise for improving charge separation and extending light absorption range. Here, WO 3 modifying reduced band gap mesoporous TiO 2 (WO 3 /RM-TiO 2 ) due to WO 3 doping was successfully fabricated by immersing mesoporous TiO 2 nanoparticles in the peroxotungstic acid sol with controllable reaction time (0–1 h). The W 6+ ions were first incorporated into the TiO 2 lattice to form W O Ti bonds, resulting in the formation of WO 3 doping TiO 2 . Then, WO 3 nanoparticles gradually formed and attached on the TiO 2 surface, constructing a novel heterojunction catalyst with WO 3 serving as both dopant and light-sensitizer for TiO 2 . Photocatalytic activity of the resulting WO 3 /RM-TiO 2 depends on the immersing duration in the peroxotungstic acid. The BET analysis shows that 0.5 h-WO 3 /RM-TiO 2 has the largest pore volume of 0.491 cm 3 g −1 and the highest surface area of 82.3 m 2 g −1 , whereas these values decline with prolonged immersing duration. As expected, the optimal efficiency in removing p-nitrophenol (PNP) is achieved over 0.5 h-WO 3 /RM-TiO 2 under visible light irradiation, which is 2.33 times that of the unmodified M-TiO 2 . This should be attributed to the suitable WO 3 doping and WO 3 modification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Lirong Chen,Jieyuan Zheng,Xiaoli Chen,Yang Zheng,Xingru Wang,Rui Ge,Chengyu Jiang,Gang Xu,Liuwen Zhong,Yanqing Zhu,Xiudi Xiao
Response time (τ, defined as the time required for 90% change in the full transmittance modulation, including coloring time τ c and bleaching time τ b ) is an important evaluation index for the performance of electrochromic (EC) materials, and it can directly reflect the microscopic rate of EC process. However, the research on the internal relationship between the response time and the process of electrochemical dynamics is rare. Herein, by controlling the thickness of the WO 3-x EC film, a complete reversal of the response time (from τ c > τ b in the thinner film to τ b > τ c in the thicker film) is observed. Based on the detailed analysis of the characteristics presented in electrochemical impedance spectroscopy (EIS), especially focusing on the changing trend about the arc of different frequency ranges and the slope value of the linear part, it can be found that this reversal is due to the change of the main dynamics process from surface capacitive-controlled to bulk diffusion-controlled with the increase of WO 3-x film thickness. Meanwhile, this change with obvious film thickness dependence requires a "trigger", which is reflected by the bleaching threshold potential. Besides, this study reveals the three stages of the EC coloring process from the perspective of dynamics, including the lithium-ions (Li-ions) adsorption charge layer, surface Faraday process, and bulk Faraday process, which also show significant film thickness dependence. The result of this work is beneficial to modulate the balance of response time and to improve the performance of EC films.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Chenzheng Hua,Guangzhong Yuan,Ziqiang Cheng,Hong Jiang,Gang Xu,Yong Liu,Gaorong Han
TiO 2 nanocrystals embedded amorphous WO 3 electrochromic films have been successfully fabricated with a facile one-step solution process. The structure and electrochromic properties of composite films were studied by transmission electron microscope, scanning electron microscope, X-ray diffraction, Raman spectroscopy, and electrochemical methods. The results show that anatase TiO 2 nanocrystals with a size of about 5–10 nm were homogeneously embedded in the amorphous WO 3 matrix (TiO 2 @WO 3 ). Compared with pure WO 3 film, the electrochromic performances of TiO 2 @WO 3 are evidently enhanced. The further electrochemical analysis indicates that the enhancement may be mainly ascribed to the reconstruction of amorphous WO 3 matrix with the emerging interfaces between nanocrystals and amorphous matrix. And the extremely high value of the coloration/bleaching reversibility is associated with the suppressing effect of TiO 2 nanocrystals upon the Li + trapping in WO 3 matrix.
研究领域:
材料科学
·
电化学
✓ 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）