RSC Advances
·
2014
·Vol. 4
·期 69
·36665-36670
·
IF 3.708
Juan Feng,Junxue Liu,Guijuan Wei,Jun Zhang,Shutao Wang,Zhaojie Wang,Changhua An
Hollow CdS nanostructures have been synthesized by a two-step ionic exchange route, which consists of a first synthesis of Ag2S intermediated hollow frames derived from the reaction of S2− ions with AgCl cube-tetrapods, and a subsequent ion-exchange conversion of the obtained Ag2S to CdS hollow nanoframes. The investigation of the corresponding transformation process with scanning electronic microscopy (SEM) revealed that the obtained CdS particles preserved the framework of the original template. The solar-driven hollow structured CdS modified with 5% (w/w) of promoter of Pt nanoparticles/nanoclusters manifested a high hydrogen evolution rate of 10.07 mmol h−1 g−1, corresponding to the apparent quantum yield of 9.6% measured at a single length of 435 nm, which is due to efficient charge separation, fast transport of the photogenerated carriers, and fast photochemical reaction at the CdS/Pt/electrolyte interfaces. The present work can benefit the development of other hollow structured nano-photocatalysts with high efficiency towards new energy applications.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
FOOD CONTROL
·
2024
·
IF 5.6
Xia Xu,Xin Liu,Yixing Qiu,Yufan Song,Xuxia Zhou,Yuting Ding
The accurate determination of histamine in fish is imperative for food safety, given the toxic nature of this biogenic amine . This study presents an innovative colorimetric aptasensor for the ultrasensitive detection of histamine in fish, utilizing nanozymes based on magnetic metal-organic frameworks coated with Pt nanoparticles (Fe 3 O 4 @MOF@Pt), which exhibit high peroxidase-like catalytic activity, magnetism, and superior optical properties. The surface of Fe 3 O 4 @MOF@Pt nanozymes were modified with DNA strands complementary to the histamine aptamer , creating effective colorimetric probes. In the presence of histamine, these colorimetric probes compete with histamine molecules for aptamer binding on the enzyme plate. Color development is triggered by adding a TMB and H 2 O 2 substrate solution to the enzyme plate. This competitive binding-based aptasensor allows for rapid and accurate histamine quantification within a linear range of 10 pM to 10 μM, and a notable detection limit of 6.23 pM. Furthermore, the sensor demonstrated excellent specificity, distinguishing histamine from l -histidine and other biogenic amines. Tested on mackerel samples, the aptasensor showed spiked recoveries of 91.4%–109.6%, validating its practical applicability. This sensor offers an ultrasensitive, specific, and reusable tool for histamine detection, representing a significant advancement in ensuring the safety of fish products.
研究领域:
食品安全
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生物传感
·
纳米技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Fuyuan Qi,Weiping Yang,Lan-Lan Lou,Shuangxi Liu,Kai Yu
Oxygen vacancies play an important role in the oxidation of biomass-derived alcohols and aldehydes using ceria-based catalysts. In this study, a highly oxygen vacancy-defective Pt/H-CeO 2 catalyst was synthesized by a straightforward strategy that involved the control of the addition of ascorbic acid and nitric acid. The addition of ascorbic acid, which acted as a pore-forming agent, promoted the hydrolysis, crystallization, and subsequent growth of Ce precursor salt, resulting in the synthesis of H-CeO 2 with abundant oxygen vacancy defects and a porous thin sheet-like morphology. However, the addition of nitric acid significantly inhibited the generation of oxygen vacancy defects. The obtained H-CeO 2 exhibited significantly increased oxygen vacancy content, active oxygen species, and specific surface area compared with CeO 2 with lower oxygen vacancy defects (L-CeO 2 ). These remarkable features led to enhanced catalytic activity of Pt/H-CeO 2 for the oxidation of 5-hydroxymethylfurfural (HMF) compared with Pt/L-CeO 2 . This can be mainly attributed to the enhanced adsorption and activation of O 2 molecules by abundant oxygen vacancies, allowing more active oxygen species to participate in the dehydrogenation of HMF. This work provides an example of oxygen defect engineering for ceria-based catalysts to boost the catalytic selective oxidation performance.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Wenhao Xia,Biyi Xu,Huanan Duan,Yiping Guo,Hongmei Kang,Hua Li,Hezhou Liu
Li7La3Zr2O12 (LLZO) is a promising electrolyte material for all-solid-state battery due to its high ionic conductivity and good stability with metallic lithium. In this article, we studied the effect of crucibles on the ionic conductivity and air stability by synthesizing 0.25Al doped LLZO pellets in Pt crucibles and alumina crucibles, respectively. The results show that the composition and microstructure of the pellets play important roles influencing the ionic conductivity, relative density, and air stability. Specifically, the 0.25Al-LLZO pellets sintered in Pt crucibles exhibit a high relative density (∼96%) and high ionic conductivity (4.48 × 10–4 S cm–1). The ionic conductivity maintains 3.6 × 10–4 S cm–1 after 3-month air exposure. In contrast, the ionic conductivity of the pellets from alumina crucibles is about 1.81 × 10–4 S cm–1 and drops to 2.39 × 10–5 S cm–1 3 months later. The large grains and the reduced grain boundaries in the pellets sintered in Pt crucibles are favorable to obtain high ionic conductivity and good air stability. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy results suggest that the formation of Li2CO3 on the pellet surface is probably another main reason, which is also closely related to the relative density and the amount of grain boundary within the pellets. This work stresses the importance of synthesis parameters, crucibles included, to obtain the LLZO electrolyte with high ionic conductivity and good air stability.
研究领域:
材料科学
·
固态电池研究
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 21
·6961
·
IF 3.4
Qing-Ling Guan,Li-Quan Dong,Qun Hao
The p-type Sb2Te3alloy, a binary compound belonging to the V2VI3-based materials, has been widely used as a commercial material in the room-temperature zone. However, its low thermoelectric performance hinders its application in the low-medium temperature range. In this study, we prepared Sb2Te3nanosheets coated with nanometer-sized Pt particles using a combination of solvothermal and photo-reduction methods. Our findings demonstrate that despite the adverse effects on certain properties, the addition of Pt particles to Sb2Te3significantly improves the thermoelectric properties, primarily due to the enhanced electronic conductivity. The optimalZTvalue reached 1.67 at 573 K for Sb2Te3coated with 0.2 wt% Pt particles, and it remained above 1.0 within the temperature range of 333–573 K. These values represent a 47% and 49% increase, respectively, compared to the pure Sb2Te3matrix. This enhancement in thermoelectric performance can be attributed to the presence of Pt metal particles, which effectively enhance carrier and phonon transport properties. Additionally, we conducted a Density Functional Theory (DFT) study to gain further insights into the underlying mechanisms. The results revealed that Sb2Te3doped with Pt exhibited a doping level in the band structure, and a sharp rise in the Density of States (DOS) was observed. This sharp rise can be attributed to the presence of Pt atoms, which lead to enhanced electronic conductivity. In conclusion, our findings demonstrate that the incorporation of nanometer-sized Pt particles effectively improves the carrier and phonon transport properties of the Sb2Te3alloy. This makes it a promising candidate for medium-temperature thermoelectric applications, as evidenced by the significant enhancement in thermoelectric performance achieved in this study.Keywords:thermoelectric materials;Sb2Te3nanosheets;Pt nanoparticles;solvothermal method
研究领域:
材料科学
·
物理学
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DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 10
·1383
·
IF 3.9
Zhen Jiang,Liduo Chen,Yanhong Cui,Huijie Gao,Yisi Zhou,Wei Zhang,Yanhua Suo,Yingjun Wang
n-Alkane hydroisomerization over bifunctional catalysts is an effective approach for clean fuel production. However, achieving metal–acid synergy and enhancing the catalytic performance by the preparation of bifunctional catalysts with suitable proximity between the metal sites and Brønsted acid sites are still challenging. In this work, a series of Pt/SAPO-11 catalysts with different Pt loading applied inn-heptane hydroisomerization was synthesized. SAPO-11 was synthesized by the Instant Exactness Synthesis (IES) method, which, with unique morphology and pore structure, was chosen as support for the hydroisomerization catalysts; Pt/SAPO-11 was synthesized with the impregnation method, Pt nanoclusters with trace loading were fabricated over the SAPO-11 support, and the as-synthesized catalysts with different Pt loading were labeled as xPt/SAPO-11 (x = 0.1, 0.3, 0.5, 0.8 and 1.0). Various characterizations, including XRD, nitrogen adsorption–desorption, SEM, TEM, NH3-TPD and XPS, were carried out on catalysts to obtain deep insights into the microstructure and valence states of xPt/SAPO-11. The catalytic performance of xPt/SAPO-11, including catalytic selectivity and conversion, was investigated in then-heptane hydroisomerization in detail. Pt loading affected the catalytic properties of xPt/SAPO-11 in the hydroisomerization ofn-heptane. The selectivity of 0.5Pt/SAPO-11 toward isomers was about 65% with a conversion of 77% at 310 °C, which was obviously higher than other xPt/SAPO-11 catalysts.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2017
·Vol. 30
·期 4
·467-473
·
IF 0.498
Zhang Yong,Chen Chun,Gong Wan-bing,Song Jie-yao,Su Yan-ping,Zhang Hai-min,Wang Guo-zhong,Zhao Hui-jun
A variety of spherical and structured activated charcoal supported Pt/Fe 3 O 4 composites with an average particle size of ∼100 nm have been synthesized by a self-assembly method using the difference of reduction potential between Pt (IV) and Fe (II) precursors as driving force. The formed Fe 3 O 4 nanoparticles (NPs) effectively prevent the aggregation of Pt nanocrystallites and promote the dispersion of Pt NPs on the surface of catalyst, which will be favorable for the exposure of Pt active sites for high-efficient adsorption and contact of substrate and hydrogen donor. The electron-enrichment state of Pt NPs donated by Fe 3 O 4 nanocrystallites is corroborated by XPS measurement, which is responsible for promoting and activating the terminal C=O bond of adsorbed substrate via a vertical configuration. The experimental results show that the activated charcoal supported Pt/Fe 3 O 4 catalyst exhibits 94.8% selectivity towards cinnamyl alcohol by the transfer hydrogenation of cinnamaldehyde with Pt loading of 2.46% under the optimum conditions of 120 °C for 6 h, and 2-propanol as a hydrogen donor. Additionally, the present study demonstrates that a high-efficient and recyclable catalyst can be rapidly separated from the mixture due to its natural magnetism upon the application of magnetic field.
研究领域:
催化
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Kaiyi Su,Yehong Wang,Chaofeng Zhang,Zhuyan Gao,Jianyu Han,Feng Wang
Herein, we reported the tuning of dominant products in the photocatalytic hydrogen transfer reaction over Pt/Nb 2 O 5 photocatalysts, using a support-induced modification strategy. In the photocatalytic conversion of phenylacetylene with ethanol as a probe reaction, the dominant product was styrene over Pt/2D Nb 2 O 5 nanoplates; in contrast, H 2 was the main product over the Pt/bulk Nb 2 O 5 . Compared to the metallic Pt species over bulk Nb 2 O 5 , the positively charged Pt (Pt δ+ ) species over 2D Nb 2 O 5 nanoplates contributed to the reduction of phenylacetylene, which was revealed by CO adsorbed Fourier transform infrared spectra. Furthermore, the present Pt δ+ species were due to the formation of Pt δ+ –O–Nb structure via oxygen transfer of 2D Nb 2 O 5 nanoplates, which was verified by the results of X-ray photoelectron spectra and H 2 temperature-programmed reduction. This work sheds light on the design and application of Nb-based catalysts in the transfer hydrogenation of organics in photocatalysis.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 20
·13556-13563
·
IF 3.9
Xia Xu,Mingqiang Li,Liming Yang,Bing Hu
Reasonable design of bimetallic nanomaterials with support is beneficial to improve catalytic performance. This work reports a new kind of sodium sesquicarbonate-supporting Fe2O3@Pt via etching Fe3O4@Pt@SiO2, which exhibits highly efficient and stable catalytic reduction performance towards 4-NP. Sodium sesquicarbonate-supporting Fe2O3@Pt has an interconnected one-dimensional network structure that provides sufficient channels for mass transfer. At the same time, a large amount of Fe2O3@Pt is exposed on its surface, which hinders the aggregation of pt clusters and Fe2O3 nanoparticles, and facilitates the direct contact of Fe2O3@Pt reaction sites with reactant molecules, thus improving the catalytic rate of 4-NP reduction reaction. Moreover, the introduction of non-metallic Fe can not only reduce the consumption of precious metal Pt, but also improve the catalytic efficiency due to the synergistic effect. This study opens up a new avenue to develop robust catalysts for heterogeneous catalytic reactions.
研究领域:
催化
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材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 7
·1-8
·
IF 2.184
Yu Ya-Nan,Lu Shi-Yu,Bao Shu-Juan
In this work, Bi 2 WO 6 nanoporous wall was synthesized by using Bi 2 O 3 as template and Bi source. Pt nanoparticles whose average size is about 8 nm were further immobilized on the Bi 2 WO 6 nanoporous wall via a simple chemical reduction process. Their photocatalytic activity and the effect of Pt modification were studied by analyzing the degradation of an organic dye, rhodamine 6G (Rh6G), under simulated sunlight. It was found that the photocatalytic ability of Bi 2 WO 6 nanoporous wall was enhanced by introducing Pt nanoparticles. Bare Bi 2 WO 6 shows a degradation efficiency of 78 % after 1 h, while the degradation efficiency of 5 wt% Pt-modified Bi 2 WO 6 was 99 %, and on further increasing the Pt content in the as-prepared Pt-modified Bi 2 WO 6 catalysts, their photocatalytic ability will decrease. The optimal catalyst could be reused without any decrease for five cycles, which may due to Pt be able to help trap the conduction band electrons in the absence of Rh6G. A possible photocatalytic mechanism was proposed and further proved by transient photocurrent response experiment.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Daoru Liu,Feifei Jiang,Qinghua Zhang,Wei-Hsiang Huang,Yanping Zheng,Mingshu Chen,Liming Wu,Ruixuan Qin,Mingzhi Wang,Shiyi Zhang,Limin Chen,Keyou Yan,Linan Zhou,Yun Zhao,Lin Gu,Guangxu Chen
Bimetallic Pt-based catalysts, for example, PtZn and PtSn catalysts, have gained significant attention for addressing the poor stability and low selectivity of pristine Pt catalysts over propane dehydrogenation (PDH). However, the structures of the active sites and the corresponding catalytic mechanism of PDH are still elusive. Here, we demonstrate a spatially confined Pt–ZnmOx@RUB-15 catalyst (where “m” is the mole ratio of Zn/Pt and RUB-15 is a layered silica), which exhibited high catalytic activity, ultrahigh selectivity (>99%), and resistance to coking at 550 °C for PDH. Significantly different from the preliminary studies over the PtZn catalysts, through the assistance of quasi-in situ X-ray photoelectron spectroscopy (XPS), in situ Fourier transform infrared spectroscopy (CO-FTIR), in situ X-ray absorption spectroscopy (XAS), and CO titration, we discovered that the active sites for PDH were the Pt–ZnOx interfaces, characterized by a structure of Ptδ+–Zn2+–O–Si. Density functional theory (DFT) calculations showed that Pt atoms positioned at Pt–ZnOx interfaces with coordinatively unsaturated ZnOx sites facilitate the C–H bond breaking of propane while concurrently suppressing deep dehydrogenation processes. This study suggests that engineering the interfaces of Pt–metal oxides under spatially confined conditions holds promise for developing highly efficient Pt-based catalysts for light alkane dehydrogenation.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lin-Ya Xu,Qian Zhou,Cai-Hao Wen,Hua-Hui Xu,Xi Zhao,Fu-Dong Liu,Meng-Fei Luo,Jian Chen
Understanding of the mechanism of saturated alkanes catalytic combustion is crucial for the petrochemical industrial exhaust elimination. Noble metals are commonly proposed to be the active sites for C–H bond activation of saturated alkanes, whereas the critical role of support is largely underestimated. Herein, we reveals a novel pathway for propane activation and combustion on acidic support of Pt catalyst, driven by oxygen spillover, which differs significantly from previously reported reaction mechanisms. Specifically, the Pt/AlSO x -I catalyst was prepared by pyrolyzing the Al 2 (SO 4 ) 3 sol–gel to obtain the acidic micro-mesoporous AlSO x support, followed by loading the Pt active sites using wetness impregnation. In comparison to Pt catalysts supported by Al 2 O 3 nanoparticles (10 nm) or commercially available common γ-Al 2 O 3 , the Pt/AlSO x -I catalyst demonstrates superior catalytic activity for propane combustion. It is found that gaseous oxygen species activated on Pt active sites spillovers to acidic support of Pt/AlSO x -I and then drives propane to activation and further oxidation on acidic support, thereby remarkably decreasing the apparent activation energies (Ea) from 112.4 to 72.0 kJ·mol −1 . Kinetic results suggest that the negative effect of oxygen competitive adsorption is weakened because propane can be activated on the acidic AlSO x support. Additionally, high proportion of metallic Pt species benefits to gaseous oxygen activation as observed on Pt/AlSO x -R, leading to the further increased catalytic activity with highest specific mass reaction rate of 170.2 μmol g Pt −1 s −1 and TOF Pt of 0.289 s −1 at 220 °C. Our primary results provide novel insights into revealing the reaction mechanism of saturated alkanes combustion on dual active sites.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 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）