TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·169-184
·
IF 0
Li Yingxia,Li Jiaxin,Yang Xiao,Wang Xitao,Xu Yanhong,Zhang Lihong
A series of PtCuCeMgAl quintuple hydrotalcite-like compounds with different Ce contents were synthesized by one-pot method. After calcining and reduction, CeO 2 -modified Mg(Al)O-supported Pt–Cu alloy catalysts were obtained. To understand the effect of Cu and Ce, the structure and physico-chemistry properties of the catalysts were characterized and analyzed, and the catalytic behaviors were investigated in a direct dehydrogenation of propane to propene. The results show that the Pt 4+ , Cu 2+ , and Ce 3+ ions can be incorporated into the brucite-like layers and the Ce content significantly affects the interaction strength between Pt and Cu and the dehydrogenation performance of propane. Under the reaction conditions, the highest propane conversion (45%) with 89% selectivity to propene and a 40% propene yield were achieved with a 0.3 wt% Ce-modified PtCu/Mg(Al)O catalyst. The improved catalytic performance is related to the easy formation of Pt–Cu alloy phase, excellent resistance to sintering, and coke deposits of active components modified by CeO 2 .
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 19
·10386-10394
·
IF 7.443
Chun-Chao Hou,Ting-Ting Li,Shuang Cao,Yong Chen,Wen-Fu Fu
A molecular photosensitizer [Ru(dcbpy)(bpy)2]2+ (dcbpy = 2,2′-bipyridyl-5,5′-dicarboxylic acid) and a proton reduction catalyst Pt(dcbpy)Cl2 were successfully incorporated into a highly robust metal–organic framework (MOF) of Zr(IV)6O4(OH)4(bpdc)6 (bpdc = 4,4′-biphenyldicarboxylic acid) by making use of a mix-and-match approach. The molecular integrity of the Ru and Pt complexes within the MOFs was demonstrated by a variety of techniques, including XRD, BET, TGA, SEM, TEM, HAADF-STEM, EDX, DRUS and XPS. This di-component Ru–Pt@UIO-67 MOF assembly allows a facile arrangement of the photosensitizer and the reduction catalyst with close spatial proximity, promotes the electron transfer between them, and thus leads to a significantly improved hydrogen evolution activity in aqueous solution at pH 5.0 upon visible light irradiation. This Ru–Pt@UIO-67 system represents the first example of MOFs functionalized with two different transition metal complexes, which can be used as a photosensitizer and catalyst, respectively, for hydrogen generation from water.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Wailan Xu,Junlin He,Liuliu Gao,Jing Zhang,Junmin Hui,Yanlei Guo,Wenjuan Li,Chao Yu
A simple process in which a graphene oxide (GO)–Prussian Blue (PB)-3,4,9,10-perylenetetracarboxylic dianhydride derivative (PTC-NH 2 ) nanocomposite film is spread onto a glassy carbon electrode (GCE) surface is described. Glucose oxidase (GOD) was adsorbed on the modified glass carbon electrode via the specific structure of hollow Pt nanospheres. This process was sufficient to prevent GOD from leaching away, and to improve the sensitivity of our sensor. To characterise the sensors, several techniques were employed, including transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, cyclic voltammetry (CV), electric impedance spectroscopy (EIS) and chronoamperometry. The resulting amperometric glucose biosensor exhibited a fast response time (within 5 s) and a good linear calibration range from 0.01 ± 0.06 mM to 5.23 ± 0.04 mM with a lower limit of detection of 3.3 μM ( S / N = 3). Possible interferents, including ascorbic acid, l-cysteine, dopamine and ethanol, showed almost negligible electrochemical responses, indicating the high specificity of the proposed biosensor for glucose detection. The improved performance of the proposed electrode for detecting glucose in human serum was ascribed to the high surface-to-volume ratio and the excellent conductivity of the hollow Pt nanospheres. This skilful strategy of incorporating the GO/PB/PTC-NH 2 nanocomposite film with hollow Pt nanospheres enhances the performance of the electrochemical sensor, which holds promising for application in bioassay analysis.
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Frontiers in Immunology
·
2024
·
IF 5.7
Shen Man,Dai Xianling,Ning Dongni,Xu Hanqing,Zhou Yang,Chen Gangan,Ren Zhangyin,Chen Ming,Gao Mingxuan,Bao Jing
The treatment of wound inflammation is intricately linked to the concentration of reactive oxygen species (ROS) in the wound microenvironment. Among these ROS, H2O2 serves as a critical signaling molecule and second messenger, necessitating the urgent need for its rapid real-time quantitative detection, as well as effective clearance, in the pursuit of effective wound inflammation treatment. Here, we exploited a sophisticated 3D Cu2-xSe/GO nanostructure-based nanonzymatic H2O2 electrochemical sensor, which is further decorated with evenly distributed Pt nanoparticles (Pt NPs) through electrodeposition. The obtained Cu2-xSe/GO@Pt/SPCE sensing electrode possesses a remarkable increase in specific surface derived from the three-dimensional surface constructed by GO nanosheets. Moreover, the localized surface plasma effect of the Cu2-xSe nanospheres enhances the separation of photogenerated electron-hole pairs between the interface of the Cu2-xSe NPs and the Pt NPs. This innovation enables near-infrared light-enhanced catalysis, significantly reducing the detection limit of the Cu2-xSe/GO@Pt/SPCE sensing electrode for H2O2 (from 1.45 μM to 0.53μM) under NIR light. Furthermore, this biosensor electrode enables in-situ real-time monitoring of H2O2 released by cells. The NIR-enhanced Cu2-xSe/GO@Pt/SPCE sensing electrode provide a simple-yet-effective method to achieve a detection of ROS (H2O2、-OH) with high sensitivity and efficiency. This innovation promises to revolutionize the field of wound inflammation treatment by providing clinicians with a powerful tool for accurate and rapid assessment of ROS levels, ultimately leading to improved patient outcomes.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenhui Fang,Tingting Tang,Min Li,Shixian Xin,Ying Wu,Yutao Cao,Zhize Yu,Wei Cui,Zengxi Li,Hong Zhao
Designing catalysts at atomic level fine-tune the electronic structure of surface-active site for efficient water splitting, is a highly desirable approach but also poses significant challenges. This study focuses on the synthesis of a series of electronically tunable metal single-atom (M−SAs) catalysts: M 9 @S-Ni(OH) 2 (M=Pt, Mn, Fe or Cu). Experimental results reveal that introduction of trace S-heteroatoms and metal atoms into Ni(OH) 2 lattice can effectively modulate the electronic structure of M 9 @S-Ni(OH) 2 through modulation of p-d and d-d orbital hybridization, resulting in exceptional performance in water electrolysis. Among M 9 @S-Ni(OH) 2 , Pt 9 @S-Ni(OH) 2 and Fe 9 @S-Ni(OH) 2 exhibit excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance, respectively, the overpotential requiring only 7 mV and 269 mV, respectively, at current density of 10 mA cm −2 . (−) Pt 9 @S-Ni(OH) 2 ||Fe 9 @S-Ni(OH) 2 (+) presents a high current density of 531.07 mA cm −2 at cell-voltage of 1.80 V in overall-water splitting (OWS), which is 14.07 times higher than that of the commercial (−) Pt/C||IrO 2 (+) (37.86 mA cm −2 ) system. This work achieves the development of cost-effective and stable electrocatalysts, offering a solution for large-scale and sustainable water-hydrogen conversion.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3101-3109
·
IF 4.831
Li Shuhuai,Liu Chunhua,Yin Guihao,Luo Jinhui,Zhang Zhenshan,Xie Yixian
The authors describe an electrochemical sensor for the neonicotinoid insecticide imidacloprid (IMI) based on Pt-In catalytic nanocomposite film and Bromophenol blue amplification. The Pt-In nanocomposite film was deposited on the surface of a modified glassy carbon electrode. The composite molecularly imprinted polymer (MIP) was prepared by electro-polymerization using bromophenol blue doped o -aminophenol as functional monomer and 4-tert-butylcalix[6]arene-IMI supramolecular inclusion complex as template molecule. The experimental results showed that the current intensity of IMI was clearly amplified in the potential range from −0.3 to −1.8 V, because of the double amplification, based on the Pt-In film and Bromophenol blue catalysis. Moreover, the double recognition ability of the sensor, which relied on the MIP and the vacuum structure of 4-tert-butylcalix[6]arene, effectively increased the specific recognition performance. The feasibility of its practical applications has been demonstrated by the analysis of vegetable samples.
A supramolecular imprinted electrochemical sensor for imidacloprid determination was prepared based on Pt-In nanocomposite film and bromophenol blue amplification. Because of the advantages of the specific recognition sites in MIPs and supramolecular chemistry, the sensor showed good selectivity for imidacloprid.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Hongbo Li,Hao Wang,Meiyi Cao,Xing Tong,Shuo Wang,Mingfei Pan
The fluoroquinolone-enrofloxacin (ENR) residue in animal-derived foods poses a significant threat to human health, thereby necessitating developing precise, efficient, and user-friendly detection methods. This study developed a dual-mode fluorescence-colorimetric immunosensing platform using the composite of bimetallic nanoparticles integrated with metal-organic frameworks (Au/Pt NPs@NH 2 -MIL-53(Al)). The Au/Pt NPs with biocompatibility and peroxidase-like activity were modified onto fluorescent NH 2 -MIL-53(Al) and conjugated with Ab 2 to construct signal probes. The platform enables dual-mode quantitative analysis through the competitive binding of ENR and ENR-BSA conjugate to signal probes. It demonstrated a wider linear range (0.08–180 ng/mL) and high sensitivity [LOD: 0.068 ng/mL (fluorescence), 0.066 ng/mL (colorimetric), and 0.074 ng/mL (smartphone-assisted color recognition)]. In real sample analyses, the recoveries ranged from 86.7 % to 106.7 %, with satisfactory stability (RSD ≤ 4.4 %, n = 3). The dual-signal mode facilitates results self-calibration, enhancing reliability, while smartphone-assisted color recognition enables on-site, convenient screening, offering great potential for ENR detection in complex food matrices.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Mingxue Yao,Meng Wang,Ye Hu,Nana Li,Baohui Wang
To meet the demands of high-performance and sustainable energy storage, this study proposes a novel VB 2 –air battery system combining a high-capacity vanadium diboride (VB 2 ) anode with a nitrogen-doped carbon-supported iron single-atom catalyst (Fe/NC) cathode. The VB 2 anode, featuring a theoretical 11-electron redox reaction, delivers ultra-high specific capacity, while the Fe/NC cathode exhibits excellent oxygen reduction reaction (ORR) performance and atomic-level dispersion. For the first time, we demonstrate that this SAC-based cathode enables outstanding synergy with the VB 2 anode, resulting in enhanced discharge capacity (up to 3900 mAh·g −1 ), excellent rate capability, and long-term discharge efficiency retention (84.4 % after 10 continuous cycles). This work reveals a promising pathway toward cost-effective, high-performance primary metal–air batteries and offers a new paradigm in cathode–anode reaction coordination for multi-electron systems.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Sujuan Zhang,Weixin Huang,Xianliang Fu,Gaoli Chen,Sugang Meng,Shifu Chen
A series of Pt nanoparticles (with size of 3–4 nm) decorated CdS nanorods were prepared via a simple solvothermal method. The samples were then used for photocatalytic selective oxidation (SO) of aromatic alcohols and reduction (SR) of nitroarenes in one reaction system. The platinized samples showed enhanced activity for the conversions than pristine CdS as Pt can serve as e − trapping and reaction sites, by which the recombination of photoinduced charge carriers can be suppressed and the adsorption of reactants and the SR of nitroarenes can be promoted. The sample loaded with only of 0.03% Pt showed the highest performance and, after irradiation for 4 h, the conversions of p-methoxybenzyl alcohol and nitrobenzene are as high as 92.7% and 94.8%, while the yields of p-methoxybenzaldehyde and aniline are 80.5% and 36.0%. The activities are about 2.0 times higher than that of CdS. The coupling reaction mechanism for the SO of aromatic alcohols to aldehydes and SR of nitroarenes to anilines in the reaction system was finally proposed.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaoyu Zhang,Xuan Wang,Ying Cao,Chengyang Liang,Shitong Geng,Haipeng Guo,Ying Liu,Yanhong Luo,Wenming Zhang,Ling Li
A porous coating structure transition metal oxide ZnCo 2 O 4 @NiMoO 4 composite was successfully synthesized on the surface of carbon paper (CP) by a simple two-step hydrothermal method as a Pt-free material for titanium mesh substrate counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). According to BET test results, the material has a high specific surface area, which can provide abundant active sites for the redox reaction of electrolytes to enhance the utilization rate of sunlight by DSSCs, and the composite materials show remarkable electrocatalytic performance in reducing iodine electrolytes and improving the photoelectric conversion efficiency (PCE) of DSSCs. Therefore, the DSSCs equipped with ZnCo 2 O 4 @NiMoO 4 /CP material CEs achieve a PCE of 9.30 % (with J sc of 20.51 mA·cm −2 , V oc of 0.763 V, and FF is 0.60), which is much higher than that of Pt CEs (7.36 %) under the same light conditions. This is due to the excellent catalytic ability and good electrical conductivity of the composite material. On the other hand, because the titanium mesh can increase the contact area between the electrode material and the substrate compared with the FTO substrate, and the titanium mesh has good electrical conductivity, it can enhance the diffusion ability of I - / I 3 - to accelerate electron transmission.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Hong Li,Yiming Wang,Rongxiu Guo,Jianwei Zheng,Zejun Sun,Xinyue Zhang,Ying Guo,Hongna Jia,Qionglin Liang,Hong-bin Sun
The heterogeneously tandem catalytic synthesis is a step-economic and work-up-saving strategy for producing chemicals, but it usually requires a special catalyst to achieve the sequential catalytic reactions . The development of metal organic frameworks provides an opportunity to fabricate multifunctional catalysts. In this work, a MOF-based sandwich-nanostructure catalyst UiO-66-NH 2 @Pt@PCN-222 is fabricated, which is made of the UiO-66-NH 2 as the core, Pt nanoparticles as the interlayer, and the defective PCN-222 as the shell. The developed catalyst shows outstanding performance for the tandem catalytic synthesis, which is the hydrogenation of nitroarenes cascaded with β-dicarbonyl compounds to form β-ketoenamines. The selectivity of β-ketoenamines reached 98% upon the completed hydrogenation of p-nitrotoluene. The stable PCN-222 shell can be regarded as an active armor, which not only protects the Pt particles from leaching or agglomerating, but also has plenty of acid sites that are conducive to the second-step condensation. At the same time, the kinetic studies show that the armor layer also affects the activity of hydrogenation, so that the hydrogenation and condensation reactions can proceed simultaneously to give the best selectivity. Various substituted dicarbonyl compounds and structurally different nitroarenes completed the conversion with excellent conversion (90–99%) and selectivity (87–98%), and this nanocatalyst can be recycled for up to six cycles without the expense of activity.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuhan Sun,Minghui Li,Xiaolei Qu,Shourong Zheng,Pedro J. J. Alvarez,Heyun Fu
A stable catalyst, Pt/carbon nanotube (CNT) coated with N-doped carbon (Pt/CNT@CN), was designed to reduce selenite (Se(IV)) in water to elemental selenium by liquid-phase catalytic hydrogenation. Commercial Pt/C, pristine Pt/CNT, and carbon-coated Pt/CNT (Pt/CNT@C) were used for benchmarking. The Pt particles in Pt/CNT@CN were completely embedded beneath the coatings to minimize leaching and were not easily accessible to Se(IV). However, Schottky–Mott-type metal–carbon junctions that activate H2 were formed on the coated catalyst, facilitating effective reduction of Se(IV). The initial activity of Pt/CNT@CN (900.5 mg L–1 gcat–1 h–1) was two times higher than that of commercial Pt/C (448.6 mg L–1 gcat–1 h–1). The commercial Pt/C and uncoated Pt/CNT lost their initial activities during reuse and were almost inactive after 10 cycles due to significant Pt leaching (>90%) during the reaction and acid-washing regeneration processes. Pt/CNT@CN maintained 33% of the initial activity after the first cycle and stabilized over the following 9 cycles due to effective protection of Pt particles by carbon coatings. After 10 cycles, the activity of Pt/CNT@CN was over 20 times higher than that of Pt/C and uncoated Pt/CNT. Overall, catalytic hydrogenation using carbon-coated-supported Pt catalysts is an effective and promising approach to remove Se(IV) in water.
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