APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Yongqi Hua,Tingting Jiang,Kun Wang,Mingmei Wu,Shuqin Song,Yi Wang,Panagiotis Tsiakaras
Despite that nitrogen (N) and sulfur (S) co-doped ordered mesoporous carbon (OMC) as Pt-free catalyst for oxygen reduction reaction (ORR) shows a desirable performance, the synthesis method is always complicated and expensive, which greatly hinders its development and application. In the present work, a highly ordered mesoporous N and S co-doped carbon material is developed. The material is obtained by combining hard template and high-temperature pyrolysis method using cheap saccharin as a single-source molecular precursor, SBA-15 as the hard template and FeCl 3 as the catalyst to promote the carbonization process. It is found that the as-prepared SN-OMC catalyst, compared with the commonly used commercial Pt/C (20 wt.%), exhibits comparable ORR electrocatalytic activity with mainly four-electron (4e − ) process, superior stability and inertness to methanol in alkaline media, which could mainly benefit from the highly ordered mesoporous structure and the synergistic effect caused by the dual N and S doping. These advantages render SN-OMC a promising ORR electrocatalyst and a cheap alternative to Pt/C for practical fuel cell applications .
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BIOSENSORS & BIOELECTRONICS
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2016
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IF 7.476
Mingdang Li,Ping Wang,Faying Li,Qingyan Chu,Yueyun Li,Yunhui Dong
Herein, a novel and sensitive sandwich-type electrochemical immunosensor was fabricated for quantitative monitoring of prostate specific antigen (PSA). The sulfo group functionalized multi-walled carbon nanotubes (MWCNTs-SO 3 H) were used as substrate material to increase the specific surface area and enhance the conductivity of the glassy carbon electrode. Gold nanoparticles (Au NPs) were introduced to enhance the load capacity of the substrate material for primary antibodies (Ab 1 ) and accelerate the electron transfer on the electrode interface. The mesoporous core-shell Pd@Pt nanoparticle loaded by amino group functionalized graphene (M-Pd@Pt/NH 2 -GS) with high specific surface area, high indexed facets, and good biocompatibility was not only as the carriers of secondary antibodies (Ab 2 ) but also catalyzed the reduction of hydrogen peroxide (H 2 O 2 ), which effectually amplified the current signal in detection of PSA. The as-proposed immunosensor exhibited high sensitivity and stability on the detection of PSA. A linear relationship between current signals and the concentrations of PSA was obtained in the range from 10 fg/mL to 50 ng/mL and the detection limit of PSA was 3.3 fg/mL (signal-to-noise ratio of 3). Furthermore, the as-proposed immunosensor showed excellent performance in detection of human serum samples. The results suggest that the proposed immunosensor will be promising in the diagnostics application for accurately quantitative detection of PSA.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 47
·18354-18365
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IF 8.262
Lin Han,Pengfei Wang,Hui Liu,Qiangqiang Tan,Jun Yang
Tailoring the internal structure and chemical composition of nanomaterials is an effective way to enhance their performance for a given application. Herein, we report a general wet-chemistry approach to produce copper (Cu)-based binary hollow nanostructures with well defined architectures and investigate their catalytic properties in electrochemical reactions. This strategy relies on the galvanic replacement between Cu seeds and noble metal precursors including ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt) in oleylamine at an appropriate temperature, which is essential to balance the reduction kinetics of the noble metal precursors by oleylamine during their galvanic replacement with Cu seed particles. Typically, the bimetallic CuPt hollow nanostructures with polyhedral morphologies exhibit enhanced catalytic properties for the oxygen reduction reaction (ORR), while their spherical counterparts obtained at a relatively low temperature show high activity for the methanol oxidation reaction (MOR). In particular, we will also demonstrate a unique application of the CuRu hollow nanostructures in supercapacitors after converting them into binary metal oxides at elevated temperatures in air.
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BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Yan Li,Junlin He,Jun Chen,Yazhen Niu,Yilin Zhao,Yuchan Zhang,Chao Yu
In this study, a dual-type responsive electrochemical immunosensor was developed for the quantitative detection of proprotein convertase subtilisin/kexin type 9 (PCSK9), a potential biomarker of cardiovascular disease in serum. N-doped graphene nanoribbons (N-GNRs) with good conductivity were used as the sensing matrix modifying the glassy carbon electrode. Palladium platinum alloy (PdPt) nanoparticles with high catalytic performance toward the reduction of hydrogen peroxide (H 2 O 2 ) were reduced onto amino-functionalized fullerene (n-C 60 -PdPt) and significantly amplified the electrochemical signal recorded by the amperometric i-t curve. Furthermore, staphylococcus protein A (SPA) with antibody orientation function was introduced to improve the immunoreaction efficiency. Accordingly, a label-free immunosensor was fabricated based on n-C 60 -PdPt/N-GNRs for the quick detection of PCSK9. Meanwhile, to realize ultrasensitive detection of PCSK9, Pt-poly (methylene blue) (Pt-PMB) nanocomposites synthesized by a one-pot method for the first time were used as a novel signal label, which exhibited uniform morphology as well as good conductivity and produced an electrochemical signal recorded by differential pulse voltammetry (DPV). Herein, a novel sandwich-type immunosensor was designed using n-C 60 -PdPt/N-GNRs as the sensing matrix and Pt-PMB as the signal label for sensitive detection of PCSK9. Under optimal conditions, the label-free immunosensor showed a linear range of 10 pg mL −1 to 100 ng mL −1 with a detection limit of 3.33 pg mL −1 (S/N=3), and the sandwich-type immunosensor exhibited a linear range of 100 fg mL −1 to 100 ng mL −1 with a detection limit of 0.033 pg mL −1 (S/N=3) for PCSK9 detection, indicating its potential application in clinical bioassay analysis.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
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IF 2.6
Ravichandran Balamurali,Narayanan Naresh,Ravichandran Sabarinathan,Liu Huiyuan,Zhang Weiqi,Bhuvanendran Narayanamoorthy,Su Huaneng
In this study, PtCo alloy nanoparticles (NPs) were successfully synthesized and deposited on nitrogen-rich carbon nanosheets derived from Polypyrrole-g-C 3 N 4 using a chemical reduction method. This electrocatalyst not only offers enhanced catalytic efficiency but also significantly improves the stability for the oxygen reduction reaction (ORR) in in acidic medium. In terms of electrocatalytic performance, the PtCo/CN@PPY-g-C 3 N 4 catalyst demonstrated a mass activity of 0.378 mA µg Pt −1 at 0.85 V, 0.131 mA µg Pt −1 at 0.9 V and a specific activity of 2.900 mA cm Pt −2 at 0.85 V, 1.004 mA cm Pt −2 at 0.9 V which are respectively 2.3, 2.8 and 10, 12 times higher than those of a commercial 20% Pt/C catalyst (0.166 mA µg Pt −1 at 0.85 V, 0.046 mA µg Pt −1 at 0.9 V and 0.285 mA cm Pt −2 at 0.85 V, 0.079 mA cm Pt −2 at 0.9 V). This indicates superior catalytic activity. Furthermore, after 5000 cycles, the PtCo/CN@PPY-g-C 3 N 4 retained approximately 77% at 0.85 V and 83% at 0.9 V of its initial mass activity, with only a 14 mV decrease in the half-wave potential, whereas commercial 20% Pt/C catalyst retained only 40% at0.85 V and 30% at 0.9 V of its initial mass activity. These enhancements can be attributed to the synergistic effects and strong interactions between the Pt–Co alloy nanoparticles and the carbon nitride support. The findings of this study underscore the potential of PtCo/CN@PPY-g-C 3 N 4 as a viable and efficient alternative to traditional catalysts in electrochemical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huanmin Liu,Jiayi Peng,Xu Zhang,Kun Zheng,Lirong Zheng,Kangle Lv,Qin Li,Peng Zhou
Employing water and biomass fuels, such as benzyl alcohol, as feedstocks for co-producing hydrogen (H 2 ) and value-added organic chemicals under solar irradiation presents a promising strategy towards accomplishing net-zero emission objectives. However, simultaneously building the optimal hydrogen-evolution and organic-dehydrogenation centers on photocatalyst surface has long been the pursuit. Herein, a facile vacancy-based strategy was utilized to engineer atomically dispersed Pt species coordinated with three foreign ligand nitrogen atoms (Pt-N 3 ) instead of intrinsic S atoms on CdS nanorods. The experimental observation demonstrates a distinctive electron-rich characteristics of Pt-N 3 structure, markedly augmenting the photogenerated charge separation efficiency via one interfacial charge effects. The density functional theory (DFT) simulation further indicates that the foreign ligand N atoms not only maintain the low hydrogen-evolution energy barrier of Pt center, but also greatly reduce the energy barrier of rate-determining benzyl alcohol dehydrogenation by forming the strong chemical interaction between ligand N atom and intermediate. Consequently, PtN 3 -CdS exhibited a high photocatalytic activity for coproduction of H 2 (5.4 mmol g −1 h −1 ) and benzaldehyde (5.2 mmol g −1 h −1 ) with a selectivity of 95.9% for value-added benzaldehyde, with the anticipation of bolstering its commercial accessibility and expediting its integration into industrial applications.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Li Tian,Shuning Yang,Guangping Ma,Pengfei Han,Hanyue Jiang,Wenzhuo Wang,Juan Lu
The electrochemiluminescence (ECL) sensor for detecting oxytetracycline (OTC) was constructed by sequentially modifying luminol@β-cyclodextrin (β-CD) and Ni-MOF@Pt NPs on the electrode surface. In this platform, luminol serves as a luminescent reagent, and Pt NPs serve as co-reaction accelerators of the system. β-CD and Ni-MOF are used as carriers to carry luminol and Pt NPs respectively, and the luminescence intensity was further improved by increasing the carrying capacit. In addition, the OTC quenching strategy is adopted, and the constructed sensor is based on the energy transfer of luminol. Under optimal conditions, this sensor exhibited the linear detection range of OTC was found to be between 2.0 × 10 −12 M to 2.0 × 10 −7 M, with a detection limit of 6.7 × 10 −13 M (S/N = 3). The sensor showed good high selectivity and ultra-sensitivity, and obtained satisfactory results when detecting honey and milk samples.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Shanpeng Li,Yuling Zhuo,Dong Liu,Hui Pan,Zhenbo Wang
Improving the Pt atoms utilization efficiency on self-supported electrodes is crucial for industrial seawater hydrogen production , but effective strategies are still lacking. Herein, we reported a novel strategy to anchor highly surface-exposed Pt single atoms on Ni 3 S 2 /Co 9 S 8 with abundant S vacancies (Pt–Ni 3 S 2 /Co 9 S 8 –Sv) as a self-supported electrode. Physical characterizations and theoretical calculations confirm that the strong Pt–S electron bridges with the coordinating role of surface S vacancies triggers the d -orbital electron rearrangements and regulates the local electron structures between the Co/Ni and Pt sites. Notably, the Pt–Ni 3 S 2 /Co 9 S 8 –Sv electrode displays an ultralow overpotential of 18 mV at 10 mA cm −2 in alkaline seawater . More importantly, our Pt–Ni 3 S 2 /Co 9 S 8 –Sv electrode assembled into an alkaline electrolysis cell can work continuously for 50 h under alkaline seawater @ 60 °C. This work provides a promising strategy for designing highly surface-exposed single-atomic catalyst for large-scale hydrogen evolution through seawater electrolysis.
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Sustainable Chemistry and Pharmacy
·
2025
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IF 5.8
Qianwei Li,Bowen Deng,Ru Feng,Di Chen,Linlin Hua
Extracting antidepressants from biological samples is challenging due to their low concentrations and complex matrices. Pipette-tip solid-phase microextraction (PT-μSPE) simplifies the process, reducing solvent use and enabling automation, but challenges like custom adsorbents and toxic solvents limit its broader application. Melt-blown polypropylene nonwoven, sourced from the middle layer of 3-ply disposable non-woven face masks, was employed as the sorbent material. The extraction tip was easily assembled by combining a 200 μL pipette tip, the melt-blown polypropylene nonwoven, and a 1 mL pipette tip. This method provides a cost-effective and sustainable alternative to conventional adsorbents. A 90% ethanol solution was selected as the desorption solvent to comply with green chemistry principles, with the volume minimized to 100 μL to reduce waste. The pH adjustment was achieved using low-toxicity sodium carbonate (Na₂CO₃). The developed PT-μSPE method proved excellent linearity, sensitivity, accuracy, precision, and robustness, making it suitable for routine antidepressant monitoring in plasma and urine. It offers a practical, scalable, and environmentally friendly solution for therapeutic drug monitoring.
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TALANTA
·
2025
·
IF 6.1
Xiao Liang,Cheng-Guo Zhan,Juan Yang,Ji-Tao Li,Wen-Bo Zhao,De-Zhi Yang,Ya-Ling Yang,Zi-Tao Zhong
Transferrin (TRF) is the main iron-containing protein in plasma, responsible for carrying iron from digestive absorption and released from the erythrocyte degradation. The plasma TRF levels can be used to diagnose anemia and monitor treatment. Herein, a sandwich type biosensor was developed for the sensitive and efficient TRF detection utilizing the affinity of boronic acid and specific recognition of antibody. TRF can be captured by the facilely synthesized phenylboronic acid decorated SiO 2 @Fe 3 O 4 magnetic nanoparticle (PBA-SiO 2 @Fe 3 O 4 ), and then the antibody functionalized Au,Pt,Cu@polydopamine (Ab-Au,Pt,Cu@PDA) with peroxidase-like activity was bond to TRF to form the sandwich conjugate. After the prompt magnetic separation and catalysis with the chromogenic substrates (TMB and H 2 O 2 ), the distinct color development can be observed and measured for the TRF quantification. The proposed method shows satisfied performance with a detection range of 0.128–2000 ng/mL and LOD of 0.051 ng/mL. Moreover, this approach possesses excellent stability and simple operation, without complicated sample pretreatment. Consequently, this biosensor poses a significant potential for the diagnosis and monitoring of abnormal TRF levels-related diseases.
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JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Yuhao Yang,Jie Ran,Teng Wang,Yongning Ma,Junli Zhu,Xiaolong Li,Zhuoya Zhao
Aqueous phase reforming of methanol (APRM) is an effective method for the storage and transportation of hydrogen (H 2 ). However, this approach faces challenges due to the limited activity and stability of metal-supported catalysts. In this study, Pt/V 2 O 3 -V 8 C 7 metal-supported catalysts were prepared for APRM and the H 2 production of Pt/V 2 O 3 -V 8 C 7 at 200 °C was 96.52 mmol·g −1 ·h −1 , which is 1.83 times and 1.71 times higher than the H 2 production performance of Pt/V 2 O 3 and Pt/V 8 C 7 , respectively. Moreover, the catalyst demonstrated remarkable stability after 10 in situ cycling tests. Structural characterization revealed that there is a strong metal-support interaction (SMSI) between Pt and V 8 C 7 , and a weak metal-support interaction (WMSI) between Pt and V 2 O 3 , which inhibits the sintering of Pt on the metal-supported catalyst. Furthermore, a straightforward experimental method has been developed that enables accurate inference of the catalytic reaction mechanism in APRM without the need for in situ material characterization. The reaction mechanism indicates that the Pt-V 8 C 7 interface serves as the active site for the methanol decomposition step, while the surface of V 2 O 3 acts as the active site for the water-gas shift reaction step. This strategy of strong-weak MSI offers a novel approach to enhancing both the stability and H 2 production performance in APRM.
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Environmental Science-Nano
·
2025
·
IF 5.1
Lu Wang,Siyuan Zhang,Jukun Xiong,Meicheng Wen
Formaldehyde (HCHO), a prevalent indoor volatile organic compound, poses significant health risks to humans even at very low concentrations. As a result, its efficient degradation at room temperature is of utmost importance. However, the detailed mechanism for catalytic oxidation of formaldehyde remains unclear, particularly regarding the role of water vapor, which has been subject to considerable debate. In this study, we synthesized Pt-supported TiO2 glass fiber catalysts (Pt/TiO2 GF) via NaBH4 reduction to investigate the reaction pathways and clarify the influence of water vapor on the oxidation process. The reaction mechanism and intermediates were systematically studied at room temperature using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), kinetic isotope effect (KIE) analysis, and density functional theory (DFT) calculations. Results revealed a clear reaction pathway of HCHO → DOM → HCOO− → CO2, with formate C–H bond cleavage (HCOO−* + O* → CO2 + OH*) identified as the rate-determining step. Both experimental KIE results and theoretical calculations confirmed that water vapor substantially reduces the activation barrier for this step, significantly promoting formate decomposition and subsequent CO2 formation. This work provides critical insights into the role of water in enhancing formaldehyde oxidation and offers theoretical support for developing efficient catalysts suitable for humid environments.
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