CATALYSIS LETTERS
·
2020
·Vol. 151
·期 1
·124-137
·
IF 2.482
Xi Zhiwen,Jia Wenzhi,Zhu Zhirong
Abstract Two series of WO 3 –ZrO 2 and WO 3 –ZrO 2 –TiO 2 composite oxides were prepared via an Evaporation Induced Self Assembly (EISA) method and applied for the hydrogenolysis of glycerol after loading with Pt. Several techniques like XRD, BET, Raman spectroscopy, NH 3 -TPD, Py-IR, TEM and XPS were adopted to characterize the physicochemical properties of the as-synthesized catalysts. The structure and catalytic activities of these catalysts were significantly affected by the calcination temperature of the composite oxides. The introduction of TiO 2 into Pt/WO 3 –ZrO 2 could inhibit the drastic decrease in catalytic performance due to the formation of inactive crystalline WO 3 under high calcination temperature of 800 ℃. A maximum activity was obtained on the Pt/WO 3 –ZrO 2 –TiO 2 catalyst when the calcination temperature was 600 ℃, which gave 73.8% glycerol conversion and 25.4% 1,3-propanediol yield. While the Pt/WO 3 –ZrO 2 catalyst only exhibited 53.4% glycerol conversion and 20.2% 1,3-propanediol yield. The enhanced activity of Pt/WO 3 –ZrO 2 –TiO 2 was ascribed to the improved acidity originating from (i) higher acidic properties of WO x species when linked to Ti with larger electronegativity other than Zr and (ii) new acid centers caused by heteroatoms linkage as the combination of ZrO 2 and TiO 2 . The effects of Pt loading amount and reaction temperatures were also investigated. Graphic Abstract
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 11
·1-8
·
IF 2.127
Sui Ning,Wang Ke,Bai Qiang,Wang Lina,Wang Tao,Xiao Hailian,Liu Manhong,Colvin Vicki L.,Zhang Qingbo,Yu William W.
Dendritic Pt–Cu nanoparticles were synthesized by a facile one-step method with the help of surfactant Brij58 at room temperature, and we also studied the effects of different Pt–Cu ratios on the morphology and size of nanoparticles. In addition, we further tuned the morphology of the Pt–Cu nanostructures by introducing bromide ions, eventually leading to the appearance of some tripod-like structures. Compared with dendritic Pt–Cu and commercial Pt black, these tripod-like Pt–Cu nanostructures exhibited higher electrocatalytic activity and CO tolerance for catalyzing methanol oxidation.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Di Yin,Yun-Dong Cao,Dong-Feng Chai,Lin-Lin Fan,Guang-Gang Gao,Ming-Liang Wang,Hong Liu,Zhenhui Kang
Water splitting offers a clean way to produce hydrogen, in which, an efficient catalyst interface is one of the key factors to boot the activity and stability. Here, using polyoxotungstate (POT) as precursor, Pt-based bifunctional catalysts were fabricated, which are composed of Pt, WO x and graphene (Pt-WO 3−x @rGO). The Pt-WO 3−x @rGO (1.58% Pt-loading) catalyst shows an enhanced catalytic activity, namely, overpotentials of 37 mV for Hydrogen evolution reaction (HER) and 174 mV for Oxygen evolution reaction (OER), and achieves a working voltage of 1.55 V at 10 mA cm −2 for water splitting in alkaline-medium. Electrochemical analyses and DFT calculation suggest that the WO x mediated interface (Pt 0 ⋅⋅⋅O − W) plays a key role to enhance the electron transfer and reduce the activation energy for both HER and OER. Moreover, this kind of Pt 0 ⋅⋅⋅O − W interface enhances the Pt based catalyst stability in alkaline-medium significantly.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yunlv Cheng,Xinshu Zhao,Yulv Yu,Lifang Chen,Tao Cheng,Jin Huang,Yan Liu,Masafumi Harada,Akimitsu Ishihara,Yuan Wang
Few currently applied carbon-supported metal cathode catalysts exhibit satisfactory durability under the harsh operation conditions of proton exchange membrane fuel cells. Herein we report for the first time a highly active In 2 O 3 supported Pt–In alloy nanocluster (NC) catalyst (Pt–In/In 2 O 3 ) toward oxygen reduction reaction , with small alloy NCs and a Pt content of 42 wt%, which exhibits obviously enhanced durability compared to currently applied carbon-supported Pt catalysts (Pt/C) and previously reported Pt NCs-based catalysts with a similar Pt content. The mass activity (MA) and specific activity (SA) over Pt–In/In 2 O 3 are 0.32 A·mg −1 Pt and 1.14 mA cm −2 at 0.9 V (vs. reversible hydrogen electrode (RHE)), respectively. Electron transfer from In to Pt in the alloy NCs occurs as confirmed by X-ray absorption measurements, which is an important cause of the high catalytic activity . After an accelerated aging test of 6000 potential cycles between 1.0 and 1.6 V, the MA loss over Pt–In/In 2 O 3 is 3%, but that over Pt/C is 33%. The catalysts subjected to the aging test are characterized by transmission electron microscopy and X-ray diffraction to understand the extremely high durability.
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RSC Advances
·
2014
·Vol. 4
·期 23
·11788-11793
·
IF 3.708
Yanyan Fang,Hailian Xiao,Ning Sui,Manhong Liu,William W. Yu
Supported Pt nanocatalysts with controlled particle size and size distribution were prepared by immobilizing Pt colloids on different iron oxide supports (γ-Fe2O3, Fe3O4, Fe2O3) via physical adsorption. These catalysts were used to catalyze the liquid phase hydrogenation of o-chloronitrobenzene (o-CNB) to o-chloroaniline (o-CAN) under mild reaction conditions (298 K, 0.1 MPa). The Pt/γ-Fe2O3 exhibited higher catalytic selectivity and activity than other similar works (selectivity = 99.9%, activity = 0.20 molo-CNB/(molPt s)). The stability of the Pt/γ-Fe2O3 was investigated, and the result showed that higher drying temperature could increase the stability of the catalyst.
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Nano Research
·
2018
·Vol. 11
·期 5
·2612-2624
·
IF 7.994
Gao Daowei,Li Shuna,Song Guolong,Zha Pengfei,Li Cuncheng,Wei Qin,Lv Yipin,Chen Guozhu
Shape-controlled synthesis of Pt−Cu alloy nanocrystals (NCs) with unique geometries is of great importance in the rational design and deterministic synthesis of highly active electrocatalysts. Herein, Pt−Cu alloy NCs with concave octahedron (COH), porous octahedron (POH), yolk–shell (YSH), and nanoflower (NOF) structures were fabricated by altering the sequential reduction kinetics in a one-pot aqueous phase. The effect of the reaction kinetics on the formation of Pt−Cu bimetallic NCs with different morphologies was analyzed quantitatively. The concentrations of glycine and metal cation are demonstrated to play a key role in the reduction of Pt(IV) and Cu(II) ions; these significantly affected the morphology of Pt−Cu NCs. These Pt−Cu alloy NCs exhibit substantially enhanced catalytic activity and durability for methanol and formic acid oxidation compared to the commercial Pt/C catalyst. Specifically, the COH and NOF Pt−Cu NCs with more step atoms, intragranular dislocations, and protrusions showed superior electrochemical properties than those of POH and YSH Pt−Cu NCs. The structure–property relationship between the Pt−Cu NCs and their electrochemical performances was also investigated in depth.
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Catalysis Science & Technology
·
2019
·Vol. 10
·期 5
·1248-1255
·
IF 5.726
Lei Wang,Yang Wang,Chang-Wu Zhang,Jing Wen,Xuefei Weng,Lei Shi
Minimizing the use of platinum while maximizing its catalytic activity is attractive but challenging in the development of industrially important platinum catalysts. Herein, using a hexagonal boron nitride (h-BN) nanosheet-supported Pt/Cu cluster catalyst, we report the promotion of the platinum utilization efficiency and catalytic performance for the dehydrogenation of propane. Specifically, as little as 100 ppm platinum exhibits high propane conversion (∼15%) and propylene selectivity (>99%) at a relatively low reaction temperature (520 °C); the formation rate of propylene reaches 7.3 mol molPt−1 s−1, which is about 10 times higher than the best value for the reported Pt/Cu single-atom alloy catalyst. The structural analysis reveals that the abundant fault edges of the h-BN nanosheets and strong bonding of copper with the edge B–O defects maintain the unique geometry of the Pt/Cu cluster, together with the metallic platinum ensemble stabilizing on the top layer of the copper cluster, leading to remarkable improvement in catalytic efficiency. This prominent promotion in catalytic efficiency is also exemplified using other supports including Al2O3, SBA-15 and SiC as counterparts.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Shuo Wang,Sheng Wang,Xupeng Zong,Shudong Wang,Xiaoli Dong
Insights into the CO oxidation and sulfur tolerance over supported Pt catalysts were carried out. The nominal 1 wt% Pt was loaded onto Al 2 O 3 , TiO 2 , SiO 2 , and SnO 2 by the incipient wetness impregnation method. Results showed that the presence of H 2 O would promote the catalytic oxidation of CO, and Pt/TiO 2 and Pt/SnO 2 catalysts showed superior catalytic activity. In combination with a series of characterizations, it was concluded that excellent catalytic activity was dependent on higher dispersion and strong metal support interaction (SMSI) whether water is present or not. In the coexistence of H 2 O and SO 2 , the sulfation of the support will lead to the deactivation of the catalyst. Sulfur resistance can be improved over TiO 2 with low sulfate decomposition temperature. While for Pt/SnO 2 catalyst, its superior sulfur-tolerance was strongly associated with its special core-shell structure. It provides guidelines for the development of catalysts with excellent CO catalytic activity and sulfur tolerance.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mengmeng Shao,Haodeng Chen,Shiji Hao,Haikun Liu,Yongyong Cao,Yanfei Zhao,Jutao Jin,Haifeng Dang,Yue Meng,Yanping Huo,Lifeng Cui
Cocatalyst loading is an efficient strategy to accelerate the hydrogen evolution reaction, which is the final crucial process to complete photocatalytic hydrogen production and realize solar-to-hydrogen conversion. Herein, we report that N-doped vanadium carbide (NVC) is combined with Pt to form a multifunctional cocatalyst capable of enhancing carrier separation, activating H 2 O, and accelerating H 2 evolution. Our designed Pt/NVC/C 3 N 4 displays much higher photocatalytic activity than g-C 3 N 4 loaded with Pt or NVC. The photocatalytic H 2 evolution rate of Pt/NVC/C 3 N 4 reaches 40 μmol/h, which is three times and one hundred times higher than that of Pt/C 3 N 4 and NVC/C 3 N 4 , respectively. The significantly enhanced photocatalytic activity of Pt/NVC/C 3 N 4 is attributed to the partial synergy between Pt and NVC, where NVC promotes carrier separation and activates H 2 O, and Pt is responsible for boosting proton reduction. Our work demonstrates that hybrid cocatalysts exhibit superior performance compared to traditional single-component cocatalysts, providing guidance for exploring highly active cocatalysts for photocatalysis.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qiaolan Shi,Lu Yuan,Joop de Vries,Brandon W. Peterson,Jian Liu,Yijin Ren,Henny C. van der Mei
Due to the high resistance and complexity of biofilms, alternatives to traditional antibiotic treatments are urgently needed. Here, we investigated whether Pt nanoparticles grown on Bi 3 O 4 Br nanosheets (Pt NP /Bi 3 O 4 Br) can enhance the efficacy of the antibiotic ampicillin against biofilm-associated infections. X-ray photoelectron spectroscopy revealed abundant oxygen vacancies in the Bi 3 O 4 Br nanosheet creating an ideal surface for Pt nanoparticles growth. The obtained Pt NP /Bi 3 O 4 Br nanozyme had a uniform Pt nanoparticle distribution confirmed by X-ray powder diffraction and transmission electron microscopy with high-angle annular dark-field scanning. Compared to Bi 3 O 4 Br nanosheets alone, the nanozyme demonstrated significantly higher catalytic activity for reactive oxygen species generation facilitated by efficient electron transfer from Pt nanoparticles. When combined with ampicillin, Pt NP /Bi 3 O 4 Br nanozyme significantly enhanced bactericidal efficacy against both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli biofilms in vitro as shown by reduction in biofilm thickness and colony-forming units. In a murine skin infection model, the combination accelerated wound healing following S. aureus infection. Additionally, the combined treatment selectively reduced the pathogen Streptococcus mutans in human ex vivo oral biofilms while preserving the healthy human microbiome indicating potential applications in dental care. In conclusion, this work demonstrates that nanozyme-enhanced antibiotic therapy offers a promising strategy to combat biofilm-associated infections and antibiotic resistance.
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高影响因子
Small
·
2025
·
IF 12.1
Zhaoxin Li,Zewen Shen,Haotian Zhang,Chumin Yan,Lisha Yin,Yezi Hu,Guangtong Hai,Guixia Zhao,Xiubing Huang
Terminal bifunctional aliphatic compounds are important intermediates for synthesis of drugs, food additives, polymers, while oxidative conversion from diols in mild conditions and the insight mechanism are rarely investigated. In this work, Pt-loaded BiVO 4 (4%Pt/S-BVO and 4%Pt/H-BVO) is proposed to be utilized for the oxidation of 1,6-hexanediol (1,6-HDO). In dark conditions, the electronic metal-support interactions between Pt and BiVO 4 and abundant oxygen vacancies (OVs) activated C-H and O 2 , leading to the primary oxidation of terminal hydroxyl group of 1,6-HDO. The generated·O 2 − radicals enable further oxidation of aldehyde group to carboxyl group. With illumination, the photo-generated holes promoted oxidation of hydroxyl group to aldehyde group while the increased ·O 2 − radicals promoted the oxidation of aldehyde group to carboxyl group. The introduced heat originated from the photothermal effect and an additional heat source is supposed to boost the mass transfer of molecules and ·O 2 − radicals. In particular, with more abundant OVs and exposed {040} facets, more ·O 2 − radicals, and improved charge separation, 4%Pt/S-BVO exhibit 90% conversion of 1,6-HDO with selectivity of 98.6% to TBACs in 6 h. Those findings highlight the great promise of catalytic organics transformation by integrating solar energy to enhance the reaction efficiency.
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Yuxuan Xie,Zhao Li,Ziruo Zeng,Lina Sun,Shuangyou Bao,Xin Sun,Kunlin Li,Chi Wang,Fei Wang,Ping Ning,Kai Li
To investigate the mechanism of the role of active center size on the selectivity of methyl mercaptan (CH 3 SH) and methane (CH 4 ) in the deep hydrogenation reaction of carbon disulfide (CS 2 ), it was first derived from DFT calculations that the Pt cluster geometries showed a decreasing and increasing pattern on the energy barriers of the two key hydrogenation steps: (I) HCSS* to HCSSH* and (II) deep hydrogenation of CH 2 S* to CH 3 SH. For further validation, we synthesized Pt NPs with varied average sizes (1.7–4.0 nm) using a reduction-agglomeration strategy to probe the source of size sensitivity at low Pt loading. It was found that the active centers of Pt NPs located in the 2.0–3.0 nm region have the highest proportion of medium-coordinated Pt sites, which can effectively promote hydrogen spillover and enhance the HCSS* pathway. Finally, with this modulation strategy, the catalytic activity and selectivity were significantly improved at 1 wt% Pt loading, which exceeded that of the fresh 4 wt% Pt/Al 2 O 3 catalyst, and the long-term stable production of CH 3 SH (selectivity was maintained at 80 %) was achieved at 250 ℃ in the high-concentration CS 2 environment.
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