ChemistrySelect
·
2025
·Vol. 10
·期 13
·e202405461
·
IF 2
Shipeng Yuan,Peilong Jiang,Guiyou Zhu,Jianwei Guo
Graphical The ligands L1 – L3 were obtained by transesterification of three alkynyl alcohols with triisopropyl phosphite and complexed with Karstedt's catalyst to investigate the effect of catalysts on the curing of one-component silicone rubber. The test results showed that the catalyst synthesized by ligand L2 was the most effective. When added to one-component silicone rubber, the silicone rubber cured at 120 C for 6 min and at 150 C for 142 s. It could be stored at room temperature for more than 30 days and at 50 °C for 24 h. The thermal stability and mechanical properties of the silicone rubber are not affected by the catalyst and are enhanced. The development of wide-range temperature-stabilized catalysts for one-component silicone rubber is challenging because the high room temperature activity of Karstedt's catalyst greatly diminishes the storage stability period of one-component silicone rubber. In this work, three catalyst ligands were constructed based on a transesterification reaction between alkynyl alcohols and phosphite, then were complexed with Karstedt's catalyst. The results of research and testing showed that the platinum-alkynyl phosphite catalysts have better room temperature stability, in which the catalyst synthesized with the ligand tris(trimethyldodecynyl) phosphite ( L2 ) enabled the silicone rubber to be stored at room temperature for more than 30 days and cured rapidly at 120 °C. Adding this catalyst not only preserved the original performance properties of silicone rubber but also enhanced its thermal stability and mechanical properties. The ligand acted as a substituent to complex with Karstedt's catalyst to inhibit its activity, thus solving the problem of poor storage stability of one-component silicone rubber at room temperature.
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Analytical Methods
·
2025
·
IF 2.6
Huiping Feng,Yue Sun,Jiang Wang,Jiwei Xu,Xihui Mu,Bin Du,Zhaoyang Tong,Bing Liu
Staphylococcal enterotoxin B (SEB) is a major pathogenic factor in foodborne diseases, and its rapid and sensitive detection is crucial for early warning of food safety risks and public health protection. In this study, a colorimetric immunosensing system for SEB detection was constructed based on a magnetic covalent organic framework (COF) composite loaded with platinum nanoparticles (Pt NPs) that exhibit dual enzymatic activities. The effective loading of Pt NPs endows the composite with excellent peroxidase (POD) and oxidase (OXD)-like activities. The COF matrix not only provides abundant binding sites for Pt NP dispersion but also enhances substrate adsorption, thereby significantly improving catalytic efficiency. By introducing an Fe3O4 core, the nanocomposite enables facile preparation of antibody–nanoparticle conjugates through separation and enrichment functions. The Fe3O4@COF@Pt nanocomposite demonstrates excellent peroxidase- and oxidase-like activities, capable of decomposing H2O2 and O2 to generate hydroxyl radicals (˙OH) and superoxide anions (O2˙−), which catalyze the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into blue oxidized TMB (OXTMB), resulting in a visible color change for signal output. The sensor achieves specific detection by utilizing its peroxidase-mimicking activity, exhibiting a linear detection range of 1–200 ng mL−1 with a detection limit as low as 0.395 ng mL−1. This nanozyme-linked immunosorbent assay (NLISA) based on Fe3O4@COF@Pt offers a highly sensitive and convenient platform for SEB detection.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Wenhai Wang,Shu Xiao,Zhijian Jia,Hongzhen Xie,Tianhua Li,Qiqin Wang,Ning Gan
Foodborne pathogens could result in serious health issues to public and thus some rapid analysis methods are urgent developed to monitor them. Herein, a dual-mode aptasensor based on electrochemical and colorimetric modes was constructed for the on-site detection of Vibrio parahaemolyticus ( V.P) in shrimps as a model. A novel nanoprobe ( [email protected] @MXenes) was developed to generate both electrochemical and colorimetric signals by modifying phenylboronic acid and ferrocene on Pt-MXenes nanocomposite . The nanoprobe exhibited both features of peroxidase mimic and specific recognition. Simultaneously, a V.P aptamer-functionalized electrode interface was fabricated to firstly specifically capture V.P, then conjugated with [email protected] @MXenes to form a sandwich complex. The complex could catalyze tetramethylbenzidine (TMB)-H 2 O 2 to produce a visible signal, and generate electrochemical signal simultaneously. Under the optimal condition, the aptasensor could determine as low as 5 CFU mL −1 V.P by electrochemical mode and 30 CFU mL −1 V.P by colorimetric mode. These superior performances may be attributed to that the synergistic catalysis and conductive effects deriving from Pt and MXenes on the nanoprobe can significantly amplify the signals to improve detection sensitivity. In particular, the dual detection system could mutually verify to achieve high accuracy. The aptasensor could also be expanded to rapid analysis of other food-borne pathogens through changing the aptamer on the electrode.
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Membranes
·
2025
·Vol. 15
·期 12
·362
·
IF 3.6
Ruili Sun,Dongming Zhu,Nan Wu,Yi Li,Ting Chen,Shaorong Wang
Efficient management for electrochemical reactions within Pt/C electrodes, specifically the oxygen reduction reaction (ORR) and methanol oxidation reactions (MOR), is critical to the performance and long-life stability of direct methanol fuel cells (DMFCs). Optimizing the hierarchical macro/mesoscale structures of Pt/C electrodes plays a decisive role in regulating the mass transport pathways and electrochemical reactions. In this work, bead-like Pt/C-ionomer hybrid porous nanofibrous networks are constructed via electrospinning. Ascribing to the hierarchical architecture consisting of continuous nanofibers and bead-like Pt/C-ionomer fibrous networks, the hybrid porous nanofibrous electrode exhibits a 55% increase in maximum mass power density in comparison to the conventional Pt/C electrode. Such enhancement is attributed to excellent ORR activity enabled by efficient triple-phase reaction regions, coupled with superior MOR tolerance resulting from restricted methanol transport from the hybrid porous nanofibrous electrode to triple-phase reaction regions.
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Small
·
2025
·
IF 12.1
Yingxue He,Bofeng Zhang,Jianhua Zhang,Juntian Chen,Kailing Zhou,FengLei Li,Hao Wang
Developing efficient hydrogen evolution reaction (HER)/hydrogen oxidation reaction (HOR) bifunctional electrocatalysts is crucial for next-generation hydrogen energy technologies. However, the fixed electronic structures of conventional catalysts fundamentally constrain their bifunctional performance. In this study, a Pt/WO 3 -based catalyst with dynamic self-switching electronic state was designed for boosting bifunctional HER/HOR electrocatalysis. During HER, the applied negative potential drives proton (H + ) insertion into WO 3 , inducing a phase transition from semiconducting WO 3 to metallic-like H x WO 3 . Electron transfer from H x WO 3 to Pt shifts Pt sites from an electron-deficient (Pt/WO 3 , model 1) to an electron-rich state (Pt/HxWO 3 , model 2), reducing the HER energy barrier from 0.4391 to 0.327 eV. Conversely, during HOR, the positive potential extracts H + from H x WO 3 , restoring the WO 3 phase and the electron-deficient Pt state, thereby lowering the HOR energy barrier from 0.5761 (Pt/H x WO 3 ) to 0.3253 eV (Pt/WO 3 ). The self-switching electronic state (model 2/model 1) endows the Pt/WO 3 -based catalyst with outstanding activity, featuring a low HER overpotential of 56 mV at 100 mA cm −2 and a high HOR exchange current density of 5.8 mA cm −2 . As an anode in hydrogen proton batteries (HPBs), it delivers a discharge capacity of 169.9 mAh g −1 at 0.1 A g −1 and maintains 80 mAh g −1 even at −40°C.
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Molecular Catalysis
·
2025
·
IF 4.9
Shijun Huang,Yu Song,Shansi Zhong,Panpan Chang,Jinshi Dong,Jiaqiang Yang
Ni based catalysts are widely used in dry reforming of methane (DRM) but still face the issue of deactivation caused by sintering and carbon deposition. Pt doped Ni-Al 2 O 3 catalyst was found of great durability which kept 100 % conversion of CO 2 over 300 h without detectable loss in activity at 700 °C, while Ni-Al 2 O 3 catalyst only maintained ∼10 h at the same condition. It is revealed that Pt and Ni are separately dispersed on Al 2 O 3 with the structure of small Pt particles distributing around Ni like satellites. Kinetic experiments, temperature-programmed surface reactions (TPSR) and DFT calculations indicated that CH 4 prefers to dissociatively adsorb on Pt surface but is hard to deeply crack to carbon because of the high energy barriers. As a result, the respective adsorption of CO 2 on Ni and CH x on Pt surface largely reduced the bear of competitive adsorption and activation of both reactants on individual Ni and thus brought enhanced activity. Additionally, surrounding Pt effectively suppresses the sintering of Ni during reaction.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Liu Xuan,Wang Yuhan,He Hu,Zhao Zhonglong,Luo Xuan,Zhang Siyang,Lu Gang,Su Dong,Wang Yucheng,Huang Yunhui,Li Qing
The long-standing challenges facing Pt-based alloy catalysts in oxygen reduction reactions (ORRs) are rapid oxidation and loss of transition metal/Pt in proton exchange membrane fuel cells (PEMFCs). In this work, we report a concept of “covalentization” in intermetallic L1 0 -PtMM’ (M = Fe, Co, Ni and M’ = one of the 4 th -period elements (from Ti to Ge)) alloys to enhance their electrochemical stability. Specifically, the formation of a quasi-covalent bond network in L1 0 -PtMM’ due to the less occupied antibonding states induced by high d -band positions of M’ elements (e.g., Ti, V, Cr) enhances atomic bond order and strength, diminishing Co anodic dissolution via strengthened Pt/Co-M’ bonds and reducing Co cathodic corrosion by inhibiting Pt oxidation through an electron buffering effect. The developed L1 0 -PtCoCr/C catalysts show a high mass activity (MA = 1.27 A mg Pt −1 ) and rated power (16.5 W mg Pt −1 ) in PEMFCs at a low total Pt loading of 0.075 mg Pt cm −2 . The catalysts also exhibit high electrochemical stability with ~3% and 5% loss of MA and rated power after 30,000 accelerated durability testing cycles and projects a lifetime of about 42,000 hours.
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APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Hui Wang,Wei Yang,Penghui Tian,Jie Zhou,Rui Tang,Shengji Wu
Catalytic combustion has been identified as one of the most efficient and economically feasible routes for removing volatile organic compounds. In this work, supported noble-metal (Pd and Pt) catalysts for catalytic combustion of toluene were prepared by an improved incipient wetness impregnation method. Controlled amounts of oleic acid (OA) were introduced into the aqueous solution of metal salts in this new preparation method, which improved Pd and Pt dispersion remarkably on SiO 2 , as confirmed by XRD and TEM. XPS results showed that introduction of OA in the catalyst preparation resulted in increased proportion of metallic palladium. All of the activities in catalysts with OA were much higher than those of the catalysts without OA in the same catalyst system. Among the catalysts prepared, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst exhibited the best catalytic activity for toluene oxidation, and the T 98 of toluene was only 160 °C under the conditions of toluene concentration at 1000 ppm and SV at 60,000 mL/(g h). Furthermore, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst maintained high catalytic activity in the active stability test at 160 °C, and the result of TG indicated that no coke was formed on the spent catalyst.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2011
·Vol. 11
·期 5
·4163-4166
·
IF 1.352
Zhao Dongbo,Tian Jingqi,Sheng Qifeng,Sun Xuping
An eletrodeposition of random arrays of Pt nanoparticles, supported on glassy carbon electrode (GCE), is reported. It has been shown that such arrays exhibited good catalytic activity with respect to methanol oxidation in an acidic medium and longer deposition time produced more Pt
nanoparticles on GCE leading to larger effective catalytic area and higher catalytic current. It was found that the process of methanol oxidation was controlled by the diffusion of methanol and the Pt nanoparticles formed stable film on GCE surface and also exhibited stable catalytic performance
towards methanol oxidation.
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ChemNanoMat
·
2026
·Vol. 12
·期 2
·e202500486
·
IF 2.6
Jing Li,Siyuan Li,Xu Liu,Ligang Wang
This study presents the development of nitrogen-doped carbon sphere/SnS 2 nanocomposites (SnS 2 @NCS) as efficient platinum-free counter electrodes for dye-sensitized solar cells (DSSCs). Nitrogen doping introduces topological defects into the carbon matrix, facilitating the epitaxial growth of ultrathin SnS 2 nanosheets into hierarchical architectures. The optimized SnS 2 @NCS electrode exhibits significantly enhanced catalytic activity, demonstrated by a low charge–transfer resistance of 1.070 Ω cm −2 (representing a 74.6% reduction compared to the undoped SnS 2 @CS) and achieves a power conversion efficiency of 8.18%, rivaling that of platinum-based counterparts. The improved performance is attributed to synergistic effects arising from C N bonds and SnS 2 nanosheets, which collectively enhance interfacial charge transport and electrolyte infiltration. This work demonstrates a cost-effective strategy for fabricating high-performance DSSCs.
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FOOD CHEMISTRY
·
2026
·
IF 9.8
Boyan Sun,Linqian Qin,Vasily G. Panferov,Chujun Liu,Xiaomei Wang,Jiankang Ren,Qian Ran,Sihan Wang,Haiyang Jiang
Ractopamine (RAC), a banned β-adrenergic agonist, poses severe risks to human health, necessitating rapid and ultrasensitive detection methods. This work presents a novel dual-mode immunoassay utilizing peroxidase-mimicking Au@Pt core-shell nanozymes for the colorimetric and photothermal detection of RAC. The optimized one-step synthesized Au@Pt nanoparticles (Au/Pt = 1:1) exhibited exceptional peroxidase-like activity (27.32 U/mg). After conjugation with monoclonal antibodies, the nanozymes served as immunoprobes in a one-step enzyme-linked immunosorbent assay (ELISA). The enhanced catalysis was elucidated by reactive oxygen species trapping, confirming hydroxyl radicals and singlet oxygen as key intermediates. The assay demonstrated outstanding sensitivity, with limits of detection at 5.32 pg/mL (colorimetric) and 1.03 pg/mL (photothermal), a significant improvement over conventional ELISA. Practical applicability was confirmed in spiked pork and pig urine, achieving recoveries of 86.0–113.0% (coefficient of variation<14.3%), offering a robust platform for on-site screening.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2016
·Vol. 30
·期 8
·722-725
·
IF 2.452
Peipei Zou,Meisong Wang,Liang Zhao,Liyi Dai,Yuanyuan Wang
A Pt@three-dimensional graphene (Pt@3DG) composite hydrogel with a unique porous nanostructure was prepared and used as an efficient, recyclable and robust catalyst for the reduction of 4-nitrophenol to 4-aminophenol under mild conditions. The influence of graphene architecture on catalytic activities was comparatively investigated by loading the same amount of Pt on reduced graphene oxide. Pt@3DG exhibits a very high catalytic activity owing to the three-dimensional macroporous framework with high specific surface area, numerous activation sites and efficient transport pathways. Moreover, catalyst separation can be easily achieved by simple filtration, and the catalyst can be reused for at least five runs, maintaining its high catalytic activity. Copyright © 2016 John Wiley & Sons, Ltd.
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