TALANTA
·
2016
·
IF 4.035
Zhuang Li,Zhenzhen An,Yongyang Guo,Kangning Zhang,Xiaoling Chen,Dongxia Zhang,Zhonghua Xue,Xibin Zhou,Xiaoquan Lu
In this work, we report a novel Au-Pt bimetallic nanoparticles (Au-PtNPs) decorated on the surface of nitrogen-doped graphene (NG) functionalized with 1, 3, 6, 8-pyrene tetra sulfonic acid sodium salt (PyTS) by direct electrodeposition method. The results of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and electrochemical impendence spectrum (EIS) reveal that the Au-PtNPs were successfully anchored on the surface of NG sheets with a diameter of 20–40 nm. Further, the prepared Au-PtNPs/PyTS-NG nanocomposite exhibits superior catalytic activity for the oxidation of nitrite. Under optimal experimental conditions, an amperometric sensor with a linear range of 0.5–1621 μM and a detection limit of 0.19 μM (S/N=3) for the detection of nitrite was set up and applied to real samples.
研究领域:
材料科学
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电化学
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纳米技术
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环境监测
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分析化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yuanyuan Zhang,Zhichun Si,Jian Gao,Yuxiang Liu,Liping Liu,Xiaodong Wu,Rui Ran,Duan Weng
NaOH-promoted Pt/TiO 2 catalysts are successfully prepared by a facile impregnation method assisted by NaOH and tested for the toluene oxidation reaction under visible light irradiation. Keeping molar ratio of Pt:Na = 1:8, the 0.1Pt-Na/TiO 2 catalyst (0.1 mol% Pt) shows excellent catalytic performance with more than 60% of toluene conversion at 45 °C and achieving total toluene removal at 280 °C, which is significantly better than 0.1Pt/TiO 2 catalyst. The structures and properties of catalysts are characterized by XRD, SEM, N 2 adsorption, XPS and UV–vis spectra. The positively charged Pt species stabilized by NaOH are the most active sites for photo-thermal catalyzing toluene oxidation. The influence of Pt loading and the effect of supports (active TiO 2 and inert Al 2 O 3 ) are also discussed.
研究领域:
催化化学
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环境化学
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材料科学
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光催化
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Chenghao Yao,Jinbiao Huang,Can Yang,Weiwei Deng,Lei Li,Zhan Lin
Photo-thermal catalysis which interplay the heat and light-induced effects have drawn broad attention owing to their synergistic effect to extend the capability of chemical transformation. Here, the effect of heat and/or light on methanol decomposition has been clarified. On Pt/TiO 2 , light irradiation activates the TiO 2 and enhance the absorption and the oxidation of intermediates. The main intermediate under PTC condition is formaldehyde, which is the same to TC condition rather than methyl formate under PC condition. Differences CO absorption site correlates with the key intermediates under PC and TC/PTC conditions. Light and heat display their strengths in a synergistic manner, optimizing the activity to promote efficient catalytic processes which is verified to be photo-assisted thermal catalysis. This work offers detailed mechanistic understanding of the surface species and paves the way for an educated microkinetic modeling approach under photo and/or thermal condition over oxide-supported metal catalysts.
研究领域:
催化化学
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材料科学
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物理化学
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表面科学
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能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Xiao-Di Tang,Yi-yang Wang,Chao-Yang Wang,Lei Yuan,Yong Yi
Platinum-containing multimetallic catalysts supported on carbon materials have become one of the main choices for direct ethanol fuel cells (DEFCs) due to their high catalytic activity for the ethanol oxidation reaction (EOR). In this study, a platinum-bismuth alloy catalyst (PtBi@CA) with uniform distribution and small particles was provided by a one-step reduction method without the addition of structure directing agents and stabilizers . In the half-cell test, PtBi@CA(50−50) with the smallest crystallite size has high peak current density and pseudo-steady current density of 64.336 mA/cm 2 and 0.096 mA/cm 2 , respectively, which is 11.22 times and 1.85 times the high of the most advanced commercial carbon-supported platinum catalysts (Pt/C). The method is simple and feasible, greatly reduces the amounts of precious metals, and has broad application prospects in the synthesis of anode electrocatalysts for direct ethanol fuel cells.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 11
·5830-5840
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IF 11.9
Xue Zhao,Mengshan Chen,Yingtang Zhou,Haibo Zhang,Guangzhi Hu
The development of water electrolysis hydrogen production technology is related to the process of large-scale application of green energy, but the high cost of Pt based materials with high catalytic activity that have been commercialized has slowed the pace of industrialization in this field owing to inherent scarcity. In this study, the surface modification technology was used to introduce closo-[B12H12]2− with weak reduction ability into a two-dimensional MXene basal plane to realize the in situ evolution of Pt4+ into snowflake like Pt nanoclusters. The reported MXene/B-Pt enables highly efficient catalytic hydrogen evolution reaction (HER) over the full pH range with an overpotential (η10) as low as 20 mV and 14 mV under basic and acidic conditions, respectively. Overall, the HER performance of MXene/B-Pt surpasses that of commercial Pt/C catalysts by about an order of magnitude improvement in mass activity. For MXene/B-Pt, the snowflake-like Pt nanoparticles not only exposed more active sites, but –Ti and –F enhance the adsorption of active H* on Pt, leading to the high HER activity of MXene/B-Pt. In situ SEIIRAS well demonstrates that whether MXenes are loaded with Pt or not has a significant effect on the HER.
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DOI
高影响因子
Biomaterials Science
·
2023
·Vol. 11
·期 6
·2129-2138
·
IF 6.6
Bengao Zhu,Mengmeng Zhang,Qiang Chen,Zeke Li,Senbin Chen,Jintao Zhu
Chemodynamic therapy (CDT) reflects a novel reactive oxygen species (ROS)-related cancer therapeutic approach. However, CDT monotherapy is often limited by weak efficacy and insufficient endogenous H2O2. Herein, a multifunctional combined bioreactor (MnFe-LDH/MTX@GOx@Ta, MMGT) relying on MnFe-layered double hydroxide (MnFe-LDH) loaded with methotrexate (MTX) and coated with glucose oxidase (GOx)/tannin acid (Ta) is established for applications in H2O2 self-supply and photothermal enhanced chemo/chemodynamic combined therapy along with photothermal (PT) /magnetic resonance (MR) dual-modality imaging ability for cancer treatment. Once internalized into tumor cells, MMGT achieves starvation therapy by catalyzing the oxidation of glucose with GOx, accompanied by the regeneration of H2O2, enabling a Fenton-like reaction to accomplish GOx catalytic amplified CDT. Moreover, MMGT manifests significant tumor-killing ability through improved CDT performance with outstanding photothermal conversion efficiency (η = 52.2%) under 808 nm laser irradiation. In addition, the release of Mn2+ from MnFe-LDH in a solid tumor can significantly enhance T1-contrast MR imaging signals. Combined with MnFe-LDH-induced PT imaging under 808 nm laser irradiation, a dual-modality imaging directed theranostic nanoplatform has been developed. The present study provides a new strategy to design H2O2 self-supply and ROS evolving NIR light-absorption theranostic nanoagent for highly efficient and combined chemo/chemodynamic cancer treatment.
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DOI
PubMed
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Yongjun Ji,Shaomian Liu,Shaojia Song,Wenqing Xu,Liang Li,Yu Zhang,Wenxing Chen,Huifang Li,Jingang Jiang,Tingyu Zhu,Zhenxing Li,Ziyi Zhong,Dingsheng Wang,Guangwen Xu,Fabing Su
Pt-based catalysts are promising for the selective catalytic reduction of NOx by CO (CO-SCR), but some technical issues hinder their practical application, including the high Pt loading needed, high reduction temperature, and the low tolerance toward SO2. Here, we report a novel Pt catalyst for CO-SCR, which has negatively charged single-atom Pt embedded on CuO squares, and the latter is supported on CoAlO nanosheets. This Pt–CuO/CoAlO catalyst with an ultra-low Pt loading (0.02 wt %) exhibited 91% NO conversion and 80% N2 selectivity in 3% O2 at 200 °C. More importantly, it showed almost no activity loss in 200 ppm SO2 over a 15 h test. The theoretical calculations reveal that the negatively charged Pt has a stronger NO adsorption ability than the positively charged Pt, and Cu serves as the CO adsorption site. The much-weakened SO2 adsorption on Pt–CuO/CoAlO relative to the NO and CO adsorption effectively avoids the catalyst poisoning by SO2.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jie Zhou,Hao Liu,Chao Xiong,Peng Hu,Hao Wang,Xuyu Wang,Hongbing Ji
Propane dehydrogenation (PDH) has been a promising method to satisfy the increasing demand for propylene, but Pt-based catalysts always suffer from sintering and coke formation. Developing stable and efficient catalysts for PDH is of great significance for the industry. Herein, the paper reports that a catalyst with potassium-promoted Pt-In bimetallic clusters encapsulated in silicalite-1 (S-1) zeolite works as an efficient and stable catalyst for PDH. The catalyst achieves a propane conversion of 43.73 % with 97.14 % selectivity of propene and an extremely high propylene productivity of 20.33 mol g Pt -1 h -1 with a weight hourly space velocity (WHSV) of 6.75 h −1 . No obvious deactivation occurs after 48 h on stream, affording an extremely low deactivation constant of 0.0025 h −1 . The introduction of indium species greatly improves the propene selectivity and restricts the coke formation. The introduction of K + into S-1 can significantly enhance the catalytic activity and the stability of the catalyst. The catalyst with excellent activity and stability is potential for industrial application.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jiaojiao Zhou,Weijia Zhu,Xuqin Lv,Xiaoping Du,Jiangling He,Jie Cai
Mercury ion (Hg2+) is toxic and can severely damage the environment and human health. Therefore, sensitive and selective Hg2+ detection methods are needed. Here, we synthesized dendritic silica nanospheres (DSN) with central-radial porous structures and immobilized Au and Pt nanoparticles into their pores. The synthesized DSN with Au and Pt nanoparticles (AuPt@DSN) exhibited superior peroxidase-like activity, stability, and dispersibility. We found that AuPt@DSN can specifically reduce Hg2+, leading to the decreased catalytic activity of the nanozymes. Under optimal testing conditions, the AuPt@DSN material was efficiently used for the visual detection of Hg2+. The detection limit was 8.58 pM with a linear range from 0.1 nM to 10 μM. Selectivity toward Hg2+ has also been demonstrated in aqueous solutions in the presence of other metal ions. This strategy is simple to utilize and has a low cost and rapid response. The practicability was further investigated by analyzing complex water samples, which suggests its potential for mercury evaluation in environmental samples.
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Lili Dong,Suxia Ren,Xiuqiang Zhang,Yantao Yang,Qinglin Wu,Tingzhou Lei
In recent years, nanocellulose-based bioinorganic nanohybrids have been exploited in numerous applications due to their unique nanostructure , excellent catalytic properties, and good biocompatibility. To the best of our knowledge, this is the first report on the simple and effective synthesis of graphene/cellulose (RGO/CNC) matrix-supported platinum nanoparticles (Pt NPs) for nonenzymatic electrochemical glucose sensing. The Pt/RGO/CNC nanohybrid presented a porous network structure, in which Pt NPs, RGO, and CNCs were integrated well. Here, cellulose nanocrystals act as a biocompatible framework for wrapped RGO and monodispersed Pt nanoparticles , effectively preventing the restacking of graphene during reduction. The superior glucose sensing performance of Pt/RGO/CNC modified glass carbon electrode (GCE) was achieved with a linear concentration range from 0.005 to 8.5 mM and a low detection limit of 2.1 μM. Moreover, the Pt/RGO/CNC/GCE showed remarkable sensitivity, selectivity, durability, and reproducibility. The obtained results indicate that the CNCs-based bioinorganic nanohybrids could be a promising electrode material in electrochemical biosensors.
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 11
·3325-3332
·
IF 4
Rongqian Cui,Jiaqi Zhou,Dan Wang,Yafei Zhao,Xu Xiang,Huishan Shang,Bing Zhang
The development of highly active, low cost and durable catalysts for selective hydrogenation of aldehydes is imperative and challenging. In this contribution, we rationally constructed ultrafine Pt nanoparticles (Pt NPs) supported on the internal and external surfaces of halloysite nanotubes (HNTs) by a facile double solvent strategy. The influence of Pt loading, HNTs surface properties, reaction temperature, reaction time, H2 pressure and solvents on the performance of cinnamaldehyde (CMA) hydrogenation was analyzed. The optimal catalysts with the Pt loading of 3.8 wt% and the average Pt particle size of 2.98 nm exhibited outstanding catalytic activity for the hydrogenation of CMA to cinnamyl alcohol (CMO) with 94.1% conversion of CMA and 95.1% selectivity to CMO. More impressively, the catalyst showed excellent stability during six cycles of use. The ultra-small size and high dispersion of Pt NPs, the negative charge on the outer surface of HNTs, the –OH on the inner surface of HNTs, and the polarity of anhydrous ethanol solvent account for the outstanding catalytic performance. This work offers a promising way to develop high-efficiency catalysts with high CMO selectivity and stability by combining clay mineral halloysite and ultrafine nanoparticles.
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DOI
PubMed
高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Kai Sheng,Mahmoud A. Khalifa,Zitao Wang,Jianming Zheng,Chunye Xu
Developing a low-cost and efficient Photovoltachromic Device (PVCD) can address the requirements of energy-harvesting smart windows . In this work, low-cost poly(3,4-(2,2-dimethylpropylenedioxy)thiophene) (PProDOT-Me 2 ) is presented for replacing expensive Pt and achieving a WO 3 -based PVCD with rapid bleaching speed. The device consists of the proposed WO 3 /PProDOT-Me 2 electrode, an electrolyte containing I − /I 3 − redox couple , and dye-sensitized TiO 2 photoanode. The PVCD changes state between colored and bleached by simply altering the open and short circuit of the device. The PVCD achieves high optical contrast of 45.1% at 680 nm with a fast bleaching time of 15.5 s, coloring time of 3.6 s, and cycling stability over 200 cycles. These unique characteristics result from the PProDOT-Me 2 could help accelerate the electrochromic process of WO 3 and fast transferring charges to the electrolyte that enhances photovoltaic performance . The accelerating mechanism is analyzed and the related experimental evaluations are executed. This study reveals promising prospects of the proposed WO 3 -PProDOT-Me 2 electrode for low-cost PVCD.
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高影响因子
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