Catalysts
·
2020
·Vol. 10
·期 2
·206
·
IF 3.52
Hanxu Zhu,Yekun Ji,Lifang Chen,Weilin Bian,Jinnan Wang
Pt nanowire-anchored dodecahedral Ag3PO4{110} was constructed for organics photodegradation. SEM and TEM images confirmed that the Pt nanowires were grafted on dodecahedral Ag3PO4, which was entirely bounded by {110} facets. All the X-ray diffraction peaks of the samples were indexed to the body-centered cubic phase of Ag3PO4, indicating that Pt nanowire-anchored dodecahedral Ag3PO4well maintained the original crystal structure. The rhombic dodecahedral Ag3PO4entirely bounded by {110} facets achieved high photocatalytic activity. Due to the formation of a Schottky barrier, the Pt nanowires improved the separation of the charge carriers of Ag3PO4. Furthermore, they provided a fast expressway to transfer the photogenerated electrons and prolonged the lifetime of the charge carriers via long-distance transport, resulting in the accumulation of holes on Ag3PO4for organics degradation. More importantly, the Pt nanowires improved the reduction potential of the photogenerated electrons for O2reduction to ·O2−, which enhanced the photocatalytic activity and anti-photocorrosion properties of Ag3PO4. We found that 99.5% of Rhodamine B (RhB) could be removed over 0.5ωt% Pt nanowire-anchored dodecahedral Ag3PO4within 10 min. Even after 10 cycles, the photocatalytic activity was still high. photoluminescence (PL), time-resolved photoluminescence (TRPL), UV–vis diffuse reflectance spectra (UV–visDRS), and photoelectrochemical analysis showed that Pt nanowire-anchored dodecahedral Ag3PO4exhibited lower bandgap, higher photocurrent intensity, better electronic conductivity, and longer charge carriers lifetime than other types of Ag3PO4crystals. Radical trapping experiments and electron paramagnetic resonance (EPR) analysis demonstrated that the holes were the main active species for organics photodegradation.Keywords:Pt nanowire-anchored dodecahedral Ag3PO4{110};anti-photocorrosion;spatial charge carriers’ separation;photogenerated electron utilization;oxygen reduction
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 47
·21654-21660
·
IF 3.3
Ye He,Panlin Wang,Zhuzheng Wu,Yating Chen,Xiaohao Gan,Fangjie Li,Wenxiang Wang
The precise identification and detection of circulating tumor cells (CTCs) is significant for the early diagnosis and prognostic treatment of cancer. However, it remains a challenge to detect CTCs with high sensitivity and specificity. In this study, a colorimetric sensor for the analysis of CTCs was constructed based on dual-aptamer recognition and core (Fe3O4)–shell (Pt) nanoparticle (Fe3O4@Pt NP) nanozymes coupled with a G-quadruplex as a signal transducer/amplifier. The results show that the linear range of the designed colorimetric sensor is 50–4000 cells and the detection limit is 4 cells. The constructed aptasensor could be extended to identify various CTCs by changing the aptamers, and holds great potential in precise tumor diagnosis.
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TALANTA
·
2023
·
IF 6.1
Mengjiao Li,Yu Wu,Chenxi Ke,Zichen Song,Meie Zheng,Qingjie Yu,Hongda Zhu,Huiling Guo,Hongmei Sun,Mingxing Liu
In this study, an ultrasensitive unlabeled electrochemical immunosensor for the detection of cardiac troponin I (cTnI) was developed based on Pt/Au modified B,S,N co-doped reduced graphene oxide (Pt/Au–B,S,N-rGO) as a signal amplification platform. First-principles calculations were employed to analyze the electron density of states of Pt/Au–B,S,N-rGO, revealing an increase in the electron density of the graphene oxide (GO) states. Furthermore, scanning electron microscopy (SEM), X-ray photoelectron diffraction spectroscopy (XPS), and electrochemical detection were used to successfully construct and analyze Pt/Au–B,S,N-rGO. The results showed that B,S,N-rGO exhibited good electrochemical activity, and the Au/Pt NPs demonstrated excellent catalytic properties, which provided a strong foundation for achieving high-sensitivity detection. Moreover, the constructed unlabeled electrochemical immunosensor had an ideal linear range (0.1 pg/mL∼50 ng/mL) and detection limit (0.082 pg/mL). In human serum detection, the results of this immunosensor were essentially similar to the ELISA results for the same samples, which suggested that the immunosensor had a promising clinical application prospect for the detection of cTnI.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiaomei Ning,Xiaosong Zhou,Jin Luo,Lin Ma,Xuyao Xu,Liang Zhan
The effects of catalyst support and synthesis process on the interaction between Pt nanoparticles (NPs) and S-doped carbon nanotubes (SCNTs), and the resultant electro-oxidation catalytic performance of glycerol, formic acid and CO were systematically researched. Pt NPs on SCNTs had better electro-oxidation catalytic performances than that of Pt NPs on CNTs. The doped S in thiophene-like structure (C-S-C) activated the neighboring C atoms to interact with Pt NPs, improving the catalytic performance with stronger ability to remove poisonous intermediates. The formed C-S-C had a synergistic effect with the neighboring Pt-C, promoting the adsorption and activation of reactants. The improved metal-support interaction resulted in Pt with smaller nanoparticle size and more exposed active sites. In different synthesis process, Pt NPs were more likely to interact with activated C neighboring S in ethylene glycol reduction method. However, defects containing doped S preferred to interact with Pt NPs in impregnation method. The research results indicated that rationally regulating the surface properties of carbon support and choosing an appropriate catalyst synthesis strategy to intensify the required metal-support interaction can greatly improve the catalytic performance.
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APPLIED CATALYSIS A-GENERAL
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2018
·
IF 4.521
Hao Chen,Jinshan Shen,Kequan Chen,Yong Qin,Xiuyang Lu,Pingkai Ouyang,Jie Fu
The oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-furandicarboxylic acid (2,5-FDCA) under base-free condition is one of the most attractive reactions. This work first reported the synthesis of highly efficient oxidation of 5-HMF to 2,5-FDCA catalyst using the atomic layer deposition (ALD) to deposit Pt nanoparticles on low surface area zirconium oxide (ZrO 2 ). Pt/ZrO 2 synthesized by ALD showed excellent activity for the oxidation of 5-HMF to 2,5-FDCA in base-free solution compared with Pt/MO x synthesized by other methods in this work or reported already. The highly dispersed and uniform particle size of Pt particles were demonstrated by transmission electron microscopy (TEM), X-ray diffraction (XRD) and temperature programmed desorption of CO (CO-TPD), which provided a striking improvement of the catalytic activity in the oxidation of 5-HMF. An enhanced C O adsorption property of Pt/ZrO 2 obtained by ALD was also characterized by CO-TPD. The enhanced adsorption property of C O facilitated a stronger adsorption between catalyst and reactant/intermediates, which associated with the high dispersion and uniform particle size distribution of Pt particles to make the adsorbed reactant be efficiently converted to 2,5-FDCA.
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ANALYST
·
2018
·Vol. 143
·期 15
·3619-3627
·
IF 3.864
Qiuyue Zhao,Qi Zhang,Yuena Sun,Yuexian Liu,Haijun Lu,Xinyu Fan,Haiyang Wang,Yufan Zhang,Huan Wang
A controllable flower-like Pt-graphene oxide (PtNF-GO) architecture was synthesized through layer-by-layer electrostatic self-assembly. Hexadecyltrimethylammonium chloride (CTAC) micelles were employed as the template and Pt nanoflowers with different sizes were selectively synthesized by controlling the dissolved K2PtCl4 precursor and CTAC amounts in the reaction system. The prepared PtNF-GO was applied for DNA damage biomarker 8-hydroxy-2′-deoxyguanosine (8-OHdG) biosensing research. With the distinctive flower-like morphology of PtNFs and high electrical conductivity of GO, the PtNF-GO architecture shows excellent electrochemical biosensing performance towards the oxidation of 8-OHdG. A very low detection limit of 0.025 nM is obtained. Moreover, the fabricated PtNF-GO was used for the detection of 8-OHdG generated from the damaged DNA sample, which can be used to evaluate and confirm the mechanism of DNA damage, and it is of great importance in gene diagnosis, clinical and life sciences.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Pengfei Pang,Xia Teng,Meng Chen,Yanli Zhang,Hongbin Wang,Chun Yang,Wenrong Yang,Colin J. Barrow
An ultrasensitive enzyme-free electrochemical immunosensor was developed for microcystin- LR (MC-LR) detection based on a unique competitive detection scheme using molybdenum disulfide (MoS 2 ) nanosheets/BSA-stabilized gold nanoclusters (AuNCs) composite and Au core/Pt shell nanoparticles (Au@PtNPs). MoS 2 /AuNCs nanocomposite was used for a platform for immobilizing more antibody due to its large surface area and excellent biocompatibility. This enzyme-free immunosensor is coupled with a robust immunosandwich format employing Au@PtNPs-labeled antibody as a non-enzymatic reporter. Due to high catalytic efficiency and good stability of Au@PtNPs, Au@PtNPs-immobilized antibody competed for target antigen to form an antibody-antigen immunocomplex and further amplified the electrochemical signal. Thus, the concentration of the MC-LR is directly proportional to the electrochemical signal of immunosensor. Under optimized conditions, the proposed enzyme-free immunosensor was employed to detect MC-LR and exhibited a wide linear range of 1.0 ng L −1 –1.0 mg L −1 with low detection limit of 0.3 ng L −1 ( S/N = 3). This ultrasensitive and high specific nonenzymatic electrochemical immunoassay shows promising application in environmental and food monitoring.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Yajie Dai,Shuxian Di,Yueling Guo,Fanghui Wang,Zhiqian Wang,Hong Zhu
Pt-based alloy catalysts are popular for fuel cell oxygen reduction reactions (ORRs) because of their high activity and low cost. However, during the preparation and reaction processes, metal nanoparticles tend to aggregate, which affects the activity and stability of the catalyst. To address this issue, this work uses Zeolite-type imidazolic acid framework material (ZIF) crystal shells to coat PtCu alloy catalysts, and N-doped nanoporous carbon layers derived from ZIFs are used to protect individual metal nanoparticles . The appropriate thickness of the ZIF-derived carbon protective layer is reported to effectively inhibit the aggregation of metal nanoparticles during high-temperature calcination , improve the utilization rate of Pt atoms and enhance the activity and stability of Pt-based catalyst. N-doping stabilizes the metal nanoparticles by enhancing their interaction with carriers. Electrochemical test results demonstrated that the mass activity of the prepared 3-Co-PtCu/NC is 6.9 times and 4.3 times that of commercial Pt/C and PtCu/C, respectively. Furthermore, the excellent half-wave potential is maintained even after 10,000 cycles. In single-cell test, the performance of 3-Co-PtCu/NC is better than Pt/C. This study provides a strategy for controlling the aggregation and detachment of metal nanoparticles in metal-based catalysts, which is conducive to improving the performance of catalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Huanan Guan,Yanyu Chen,Yue Xue
The self-assembly approach has successfully been used to generate Fe 3 O 4 @Pt, a material that can mimic peroxidase . The material was created by modifying the surface of Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) with -NH 2 functional groups using 3-Aminopropyltriethoxysilane (APTES), and then using the coordination between platinum ions and -NH 2 on the surface of magnetic particles to reduce platinum ions to the surface of magnetic particles under ultrasonic conditions to produce Fe 3 O 4 @Pt composite nanoparticles . The Fe 3 O 4 @Pt core-shell composite material not only has the inert metal Pt to protect Fe 3 O 4 to improve the stability of Fe 3 O 4 in the biological matrix, but also has the high catalytic activity of Fe 3 O 4 and Pt. The catalysts were characterized, and the findings revealed that they were non-homogeneous Fenton catalysts with high dispersion, uniform particle size, and a large specific surface area . Since a large number of free radicals generated during the catalysis of Fe 3 O 4 @Pt mimic enzyme can trigger the Fenton reaction, tetracycline (TC) and oxytetracycline (OTC) were chosen as target substances, and a system for the combined degradation of tetracyclines pollutants by mimic enzyme and Fenton reaction was established, and the catalytic mechanism of this system has been investigated. The findings indicate that by using a concentration of 0.25 mol/L of H 2 O 2 , a catalyst amount of 1.5 g/L, a reaction time of 50 min, and a reaction temperature of 50°C, the degradation rate of TC and OTC can exceed 97 %, following first-order degradation kinetics. Under ideal conditions, over 95 % of each tetracyclines was degraded in the simulated food processing wastewater, effectively achieving tetracyclines degradation in the actual wastewater. In addition, the reusability of the recovered Fe 3 O 4 @Pt mimetic enzyme was investigated. The findings indicated that the Fe 3 O 4 @Pt mimetic enzyme has exceptional activity, stability, and reproducibility. The combination of the Fenton reaction with the Fe 3 O 4 @Pt mimetic enzyme can expedite the degradation of tetracyclines, offering a novel approach for eliminating recalcitrant contaminants in wastewater.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Feng Wu,Ting Huang,Yangjian Hu,Xin Yang,Qingji Xie
A composite film of glucose oxidase (GOx), imidazolium alkoxysilane (ImAS, a silane-ionic liquid (IL) bifunctional reagent) and chitosan (CS) was electrodeposited in a one-pot manner on a reduced graphene oxide (RGO)–Pt nanoparticle (PtNP) modified Au electrode for biosensing of glucose. Cyclic voltammetry electroreduction of coexisting p -benzoquinone was used to lift the electrode-surface pH for the GOx–ImAS–CS deposition, as a result of deprotonation of CS and hydrolyzation/condensation of ImAS at lifted pH. The RGO–PtNP composite was prepared through mild room-temperature chemical reduction of graphene oxide and H 2 PtCl 6 ·6H 2 O by formic acid , as characterized by UV–visible/FT-IR/Raman spectrophotometry , scanning electron microscopy and electrochemical techniques. The GOx–ImAS–CS/RGO–PtNP/Au electrode was used for glucose biosensing by anodically detecting the enzymatically generated H 2 O 2 at 0.55 V versus SCE. Under the optimal conditions, the GOx–ImAS–CS/RGO–PtNP/Au electrode showed a linear amperometric response to glucose concentration from 2.0 μM to 5.5 mM with a sensitivity of 84.4 μA mM − 1 cm − 2 and a limit of detection of 0.02 μM ( S / N = 3), which is superior to GOx–CS/RGO–PtNP/Au, GOx-(IL-NH 2 )–CS/RGO–PtNP/Au, GOx-(3-aminopropyltriethoxysilane)–CS/RGO–PtNP/Au and GOx–ImAS–CS/Au electrodes as well as many reported enzyme electrodes fabricated using similar materials.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Yang Fan,Pei-Fang Liu,Zi-Juan Yang,Tong-Wu Jiang,Kai-Li Yao,Ran Han,Xin-Xin Huo,Yun-Yi Xiong
Porous carbon spheres (PCSs) are prepared via a facile hydrothermal carbonization and chemical activation route with pectin as the biomass precursor. The as-obtained PCSs present a large specific surface area (2440 m 2 g −1 ), well-balanced micro/mesoporosity with narrow pore size distribution and high content of oxygen-containing functional groups. The structure features make the PCSs an ideal electrode material for electrochemical energy storage . As electrode material for supercapacitors , the PCSs exhibit a high specific capacitance, good rate capacity and cycling stability. Furthermore, the PCSs show attractive property as support material for Pt electrocatalysts . Pt nanowires (PtNWs) grown on the PCSs interconnect with each other to form a porous nanowires network structure. The three-dimensional (3D) hybrid catalyst material consisting of PtNWs network supported on PCSs exhibit superior catalytic activity and stability towards both methanol and ethanol electro-oxidation in acidic media. In addition, owing to the rich presence of surface oxygen groups on PCSs, the CO-poisoning tolerance of the supported Pt nanowires is greatly promoted.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Xingxing Zhou,Shijing Guo,Jiaxi Gao,Jianmin Zhao,Shuyan Xue,Wenju Xu
Based on cascade catalysis amplification driven by glucose oxidase (GOx), a sensitive electrochemical impedimetric aptasensor for protein (carcinoembryonic antigen, CEA as tested model) was proposed by using Cu-based metal-organic frameworks functionalized with Pt nanoparticles , aptamer , hemin and GOx ( [email protected] ). CEA aptamer loaded onto [email protected] was bound with hemin to form [email protected] (hGq) with mimicking peroxidase activity. Through sandwich-type reaction of target CEA and CEA aptamers (Apt1 and Apt2), the obtained [email protected] as signal transduction probes (STPs) was captured to the modified electrode interface. When 3,3-diaminobenzidine (DAB) and glucose were introduced, the cascade reaction was initiated by GOx to catalyze the oxidation of glucose, in situ generating H 2 O 2 . Simultaneously, the decomposition of the generated H 2 O 2 was greatly promoted by [email protected] and hGq as synergistic peroxide catalysts, accompanying with the significant oxidation process of DAB and the formation of nonconductive insoluble precipitates (IPs). As a result, the electron transfer in the resultant sensing interface was effectively hindered and the electrochemical impedimetric signal (EIS) was efficiently amplified. Thus, the high sensitivity of the proposed CEA aptasensor was successfully improved with 0.023 pg mL −1 , which may be promising and potential in assaying certain clinical disease related to CEA.
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