NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 46
·17954-17962
·
IF 3.069
Chang Liu,Xin Ran,Qing Qu,Tiantian Zhang,Guanben Du,Long Yang
Herein, we report a surfactant-controlled strategy for synthesizing Pd–Pt bimetallic nanocrystals (NCs) with different morphologies via a high-yield and one-pot synthesis method in an aqueous solution for catalyzing the ethanol oxidation reaction. Polyallylamine hydrochloride (PAH) was utilized to modulate the reduction kinetics to obtain diverse morphologies. By simply changing the concentration of surface controller PAH in the original growth solution, three different shapes of Pd–Pt NCs (nanospheroids, nanoflowers, and nanoworms) could be prepared by using H2PtCl6 and PdCl2 as metal precursors and CTAB as a stabilizer. Compared with nanoworms and nanospheroids, the as-prepared nanoflowers exhibited the highest electrocatalytic activity and possessed Pd–Pt core–shell nanostructures. The important role of PAH was confirmed to tune the reduction kinetics, resulting in the distinct morphologies of Pd–Pt NCs. To the best of our knowledge, this is the first report in which Pd–Pt NCs with PAH-controlled structures are prepared in a one-pot aqueous phase by adjusting the sequential reduction kinetics. Furthermore, these Pd–Pt NCs exhibited superior catalytic activity for the ethanol electrooxidation in comparison with that of the commercial Pd/C catalyst.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ACS Catalysis
·
2015
·
IF 9.312
Peipei Zhang,Yibo Hu,Baihai Li,Qiuju Zhang,Chen Zhou,Hongbo Yu,Xuejun Zhang,Liang Chen,Bryan Eichhorn,Shenghu Zhou
This study investigates the structural stability of small Pd@Pt core@shell octahedral nanoparticles (NPs) and their shell thickness dependent catalytic performance for p-chloronitrobenzene hydrogenation with H2. The 6–8 nm Pd@Pt octahedral NPs are prepared by a sequential reduction method, and the characterization results confirm that Pd@Pt octahedral NPs with one to four atomic Pt layers can be controllably synthesized. The Pd@Pt octahedral NPs with one atomic Pt layer demonstrate excellent structural stability with the maintenance of core–shell structures as well as high catalytic stability during cycle to cycle catalytic p-chloronitrobenzene hydrogenation reactions. The alumina-supported Pd@Pt octahedral NPs illustrate a superior catalytic performance relative to individual Pt and Pd and their physical mixtures. Theoretical calculations by density functional theory suggest that the unexpected structural stability for Pd@Pt octahedral NPs with thin Pt shells and their corresponding catalytic stability during hydrogenation reactions can be ascribed to the strong binding between Pt surfaces and reactants/products in catalytic reactions. The enhanced catalytic performance of Pd@Pt octahedral NPs possibly originates from the core–shell interaction, which adjusts the electronic state of surface Pt atoms to be suitable for selective p-chloronitrobenzene hydrogenation.
研究领域:
材料科学
·
催化化学
·
理论计算
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 21
·期 2
·391-401
·
IF 2.327
Peng Meiling,Xu Wei,Cui Weihao,Wang Tao,Wang Sheng
This study reports the synthesis of octahedral Pd-Pt bimetallic alloy nanocrystals through a facile, one-pot, templateless, and seedless hydrothermal method in the presence of glucose and hexadecyl trimethyl ammonium bromide. The morphologies, compositions, and structures of the Pd-Pt nanocrystals were fully characterized by various physical techniques, thereby demonstrating their highly alloying octahedral nanostructures. The formation or growth mechanism of the Pd-Pt bimetallic alloy nanocrystals was explored and is discussed here based on the experimental observations. In addition, the synthesized Pd-Pt nanocrystals were applied to the methanol oxidation reaction (MOR) in alkaline media, which proved that the as-prepared catalysts exhibit enhanced electrocatalytic activity for MOR. Pd 1 Pt 3 exhibited the best stability and durability, and its mass activity was 3.4 and 5.2 times greater than those of Pt black and Pd black catalysts, respectively. The facile synthetic process and excellent catalytic performance of the as-prepared catalysts demonstrate that they have the potential to be used in direct methanol fuel cell techniques.
研究领域:
材料科学
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化学
·
能源科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Haoyang Fu,Meirong Li,Qianyu Xu,Guoliang Chen,Yunjie Zou,Weixian Zhang,Shuzhou Li,Lan Ling
Downsizing supported metal of Fe 0 -based materials in dealing with ever-growing pharmaceutical contamination issues are highly desired but still challenging. Herein, we develop a modular design protocol to synthesize a family of ultrafine alloy nanoclusters embedded in a nitrogen-enriched carbon framework (NEC@FeM (M=Pd, Pt, Au)). Engineering the fine structure of nitrogen-enriched carbon and interfacial interaction with bimetallic nanoclusters largely suppresses bimetallic overgrowth, eventually producing supported ultrafine (< 4 nm), highly dispersed, well-alloyed nanoclusters. The alloying Fe 0 with M for ultrafine nanoclusters optimize the electron flow, chemical stability, and catalytic property, resulting in the obtained NEC@FeM exhibiting excellent doxorubicin (DOX) degradation performance. Density functional theory calculation combined with experimental results attribute the outstanding DOX degradation ability of NEC@FePd originally to the synergistic effect of enhanced DOX affinity and efficient electrons transfer from Fe to DOX. This work provides a paradigm for the design of ultrafine Fe 0 -based nanocluster with application in pollution control.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
药物化学
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产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2021
·
IF 5.373
Fenglin Zhang,Zhiguang Liu,Yujie Han,Lifang Fan,Yujing Guo
Carcinoembryonic antigen (CEA) is considered as a disease biomarker, which is related to various cancers and tumors in the human bodies. Sensitive detection of CEA is significant for clinical diagnosis and treatment. Herein, we proposed an electrochemical aptasensor for CEA detection based on the amplification driven by polydopamine functional graphene and Pd-Pt nanodendrites ( [email protected] /Pd-PtNDs), conjugated hemin/G-quadruplex (hemin/G4), which possess mimicking peroxidases activity. Firstly, [email protected] was modified on the electrode surface for fixing CEA aptamer 1 (Apt1). Then, [email protected] /Pd-PtNDs with large surface area served as matrix for immobilization of hemin/G4 to obtain the secondary aptamer. In virtue of the sandwich-type specific reaction between CEA and the corresponding aptamers, the second aptamer was captured on the sensing interface, which can catalyze the oxidation of signal probe hydroquinone (HQ) with H 2 O 2 and amplify current signal. Furthermore, the electrochemical signals of HQ were proportional with CEA concentrations. Under the optimal conditions, a dynamic response range from 50 pg/mL to 1.0 μg/mL and a detection limit of 6.3 pg/mL for CEA were obtained. Moreover, the proposed strategy represented satisfactory sensitivity and stability, and showed a good precision in real samples application.
研究领域:
生物传感器
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分析化学
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纳米技术
·
癌症诊断
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产品关联
DOI
PubMed
高影响因子
Foods
·
2023
·Vol. 12
·期 23
·4260
·
IF 5.2
Yuan Fang,Shusen Ding,Weiran Li,Jingjing Zhang,Hui Sun,Xiaodong Lin
Silver ions (Ag+) exist widely in various areas of human life, and the food contamination caused by them poses a serious threat to human health. Among the numerous methods used for the detection of Ag+, fluorescence and colorimetric analysis have attracted much attention due to their inherent advantages, such as high sensitivity, simple operation, short time, low cost and visualized detection. In this work, Pd/Pt nanoflowers (NFs) specifically responsive to Ag+were synthesized in a simple way to oxidize o-phenylenediamine (OPD) into 2,3-diaminophenazine (DAP). The interaction of Ag+with the surface of Pd/Pt NFs inhibits the catalytic activity of Pd/Pt NFs towards the substrate OPD. A novel dual-channel nanosensor was constructed for the detection of Ag+, using the fluorescence intensity and UV-vis absorption intensity of DAP as output signals. This dual-mode analysis combines their respective advantages to significantly improve the sensitivity and accuracy of Ag+detection. The results showed that the limit of detection was 5.8 nM for the fluorescence channel and 46.9 nM for the colorimetric channel, respectively. Moreover, the developed platform has been successfully used for the detection of Ag+in real samples with satisfactory recoveries, which is promising for the application in the point-of-care testing of Ag+in the field of food safety.Keywords:silver ions;Pd/Pt nanoflowers;fluorescent sensor;colorimetric sensor
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 13
·135703
·
IF 3.551
Ruiwen Yan,Xiaoyu Sun,Xiaoling Zhang,Jun Zheng,Baokang Jin
In the present work, Pd–Pt nanoparticle/polyaniline/carbon nanotube (NP/PANI/CNT) composites, synthesized through the uniform distribution of Pd–Pt NPs, whose single size was controlled to 2–4 nm by citric acid, on a PANI/CNT compound, served as the electrode catalysts for effective methanol oxidation. The structural characteristics were identified by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy, and revealed that the Pt65Pd35 NP/PANI/CNT composite displayed superior electrocatalytic oxidation performance and vitality in various Pd–Pt NPs. The results indicated that as an excellent anode catalyst the complex would have application prospects for effective methanol oxidation.
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DOI
高影响因子
HYDROMETALLURGY
·
2025
·
IF 5.3
Feng Feng,Heda Ding,Jiaying Zhang,Lu Yu,Yuxue Yue,Yanxia Sun,Lingling Guo,Xiaoliang Xu,Chunshan Lu,Qunfeng Zhang,Xiaonian Li
The development of industrial technology has significantly promoted the production and accumulation of spent precious metal-based catalysts. This work describes the synthesis of an ionic liquid – [BIim][Cl 3 ] and its application as an alternative to toxic and corrosive reagents for precious metal leaching from waste catalysts. The leaching process using [BIim][Cl 3 ] is proved to be safe and green. It offers a higher stability and higher leaching efficiency compared to other reagents used in previous publications. The ionic liquid [BIim][Cl 3 ] enabled the efficient leaching of Pd and Au, as well as the extremely stable precious metals Pt, Rh under mild conditions. The highest leaching efficiencies achieved by [BIim][Cl 3 ] were 99.9 %, 98.5 %, 98.6 % and 90.6 % for Pd, Au, Pt and Rh under the optimal leaching conditions, respectively. In order to reveal the leaching mechanism, XPS, far infrared (FIR), NMR, and EDS were used to demonstrate the importance of imidazolium cations in the leaching process. The leaching pathway was proposed based on the DFT calculation results on transition state energy barrier.
研究领域:
化学工程
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材料科学
·
环境科学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2026
·
IF 2.4
Jing Li
Developing cost-effective and highly durable electrocatalysts to overcome the sluggish kinetics of the oxygen reduction reaction (ORR) is critical for the promotion of proton exchange membrane fuel cells (PEMFCs). In this work, a ternary Pd–Pt alloy/WO₃–rGO nanocomposite catalyst was synthesized by a developed two-step chemical reduction method. This strategy enabled the distribution of Pd–Pt alloy nanoparticles very tightly integrated with finely dispersed WOₓ species on conductive rGO support. Structural characterizations confirmed formation of a Pd–Pt alloy phase and strong electronic interactions between the alloy and WOₓ, which resulted in modified surface electronic properties favorable for ORR. Electrochemical characterization revealed that the Pd–Pt–WO₃/rGO catalyst presented the largest electrochemically active surface area (176.29 m² g⁻¹) and superior ORR performance, achieving a mass activity of 83.96 mA mg⁻¹ and a Tafel slope of 70.91 mV dec⁻¹ at 0.9 V vs RHE. The catalyst exhibited superior durability, retaining 94.4% of its initial ECSA after 5000 accelerated cycles, and showed the lowest charge-transfer resistance (0.88 Ω), suggesting its improved conductivity and interfacial charge transfer. The remarkable performance is attributed to the synergistic effects between Pd–Pt alloying, electronic modulation by WOₓ species, and the high conductivity of rGO. These combined features are important for high power density and long stability operability in real PEMFC applications. This study presents a practical pathway for designing high-performance, low-Pt-content catalysts for efficient and durable PEMFCs.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Xiaolong Liu,Li Chen,Tingyu Zhu,Ruliang Ning
Catalytic oxidation of chlorobenzene over noble metal catalysts Pd/TiO 2 , Pt/TiO 2 , Ru/TiO 2 , and Rh/TiO 2 was evaluated, and Ru/TiO 2 contributed the highest catalytic activity and CO 2 selectivity. During the oxidation, polychlorinated benzenes PhCl x (x ≥ 2) were observed, and Ru/TiO 2 showed apparently lower PhCl x concentrations than other three samples. With the improvement of temperature, the maximum concentration appeared in the sequence of dichlorobenzene (PhCl 2 ), trichlorobenzene (PhCl 3 ), tetrachlorobenzene (PhCl 4 ), and pentchlorobenzene (PhCl 5 ), whereas the concentration of hexachlorobenzene (PhCl 6 ) was always low and showed no apparent regularity. Besides, the dioxin-like PCBs (dl-PCBs) were collected and analyzed for Pd/TiO 2 and Ru/TiO 2 . The ∑dl-PCBs produced by Pd/TiO 2 (0.0055 ng WHO-TEQ/Nm 3 ) was about 1.5 times that of Ru/TiO 2 (0.0027 ng WHO-TEQ/Nm 3 ). XPS analyses revealed that Ru/TiO 2 -used and Rh/TiO 2 -used gave the lowest and the highest Cl content of 0.61% and 1.87%. Ru/TiO 2 -used afforded the lowest (Cl ad +Cl or )/Cl value (22.1%) and the highest Cl br /Cl value (77.9%), which might be an important reason for its strongest chlorine removal ability and the lowest yields of polychlorinated by-products, whereas other three catalysts showed similarity in the Cl distributions. Additionally, systematic in-situ FTIR studies were conducted, and a reaction mechanism for the catalytic oxidation of chlorobenzene was proposed.
研究领域:
环境化学
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催化
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污染控制
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材料科学
·
化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Yutao Chen,Jihui Xiang,Jinmin Xie,Xinyu Wang,Zeyu Jiang,Yanfei Jian,Mudi Ma,Chi He
SO 2 exhibits opposite effects on C 3 H 8 oxidation over Pd/SiO 2 and Pt/SiO 2 . • O 2 concentration regulates sulfur species evolution and SO 2 tolerance. • Sulfate species block Pd active sites and induce Pd particle sintering over Pd/SiO 2 . • Pt-O-O-S structures on Pt/SiO 2 promote C 3 H 8 adsorption and C-H cleavage. The oxygen concentration in industrial C 3 H 8 -containing exhausts fluctuates significantly (from 0.5 to 18 vol%). However, the intrinsic effect of SO 2 on catalytic C 3 H 8 oxidation under diverse oxygen conditions is greatly overlooked, leading to a discrepancy in the SO 2 tolerance of developed catalyst between laboratory and real-world emission conditions. Herein, the influences of oxygen contents on sulfur species distribution and subsequent sulfur tolerance of typical Pd/SiO 2 and Pt/SiO 2 catalysts during C 3 H 8 oxidation were systematically explored. Experimental results reveal that the oxygen concentration dramatically affects the types and contents of sulfur species over catalysts. For Pd/SiO 2 , SO 2 tends to be converted into sulfate (SO 4 2- ) species to cover the Pd 0 active sites and causes Pd particle sintering, thereby inhibiting the C 3 H 8 adsorption and oxidation. In sharp contrast, sulfite (SO 3 2- ) species form on Pt/SiO 2 , leading to a novel Pt-O-O-S active interface that enriches the adjacent Pt site with electrons, promoting C 3 H 8 adsorption and C-H cleavage and further enhancing catalytic activity. As oxygen concentration decreases, the impact of SO 2 on catalytic performance becomes more pronounced. Under the oxygen-lean conditions, Pd particles sintering caused by SO 2 is the most severe at 1 vol% O 2 , causing an 80 °C temperature increasing in 90% C 3 H 8 conversion; however, the contents of SO 3 2- species and Pt-O-O-S structures on Pt/SiO 2 are elevated, facilitating C 3 H 8 adsorption and activation. Our findings enrich the understanding of SO 2 behavior under different industrial conditions, providing a theoretical basis for the design of SO 2 -tolerant catalyst in diverse application scenarios. Download: Download high-res image (178KB) Download: Download full-size image
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2013
·
IF 3.554
Jun Yan,Shi Liu,Zhenqin Zhang,Guangwu He,Ping Zhou,Haiying Liang,Lulu Tian,Xuemin Zhou,Huijun Jiang
Pd–Pt bimetallic nanoparticles anchored on functionalized reduced graphene oxide (RGO) nanomaterials were synthesized via a one-step in situ reduction process, in which Pt and Pd ions were first attached to poly(diallyldimethylammonium chloride) (PDDA) functionalized graphene oxide (GO) sheets, and then the encased metal ions and GO were subjected to simultaneous reduction by ethylene glycol. The as-prepared Pd 3 Pt 1 /PDDA-RGO nanocomposites were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and electrochemical methods. In addition, an electrochemical sensor based on the graphene nanocomposites was fabricated for the simultaneous detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA) in their ternary mixture. Three well-separated voltammetric peaks along with remarkable increasing electro-oxidation currents were obtained in differential pulse voltammetry (DPV) measurements. Under the optimized conditions, there were linear relationships between the peak currents and the concentrations in the range of 40–1200 μM for AA, 4–200 μM for DA and 4–400 μM for UA, with the limit of detection (LOD) (based on S/N = 3) of 0.61, 0.04 and 0.10 μM for AA, DA and UA, respectively. This improved electrochemical performance can be attributed to the synergistic effect of metallic nanoparticles and RGO and the combination of the bimetallic nanoparticles. Furthermore, the practical electroanalytical utility of the sensor was demonstrated by the determination of AA, DA and together with UA in human urine and blood serum samples with satisfactory results.
研究领域:
材料科学
·
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）