JOURNAL OF ALLOYS AND COMPOUNDS
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2013
·
IF 2.39
Zhang-Ying Lv,Yao Fei,Wan-Yi Chen,Yan-Fei Tan,Chao-Qun Sun,Jian-Rong Chen,Ai-Jun Wang,Jiu-Ju Feng
In this report, a simple, facile, controllable, and green one-step electrochemical co-deposition method was developed for the preparation of hierarchical wheat-like Au–Pd heterostructures on a glassy carbon electrode (GCE) without any template or surfactant, only using l -glutamic acid as a growth directing agent. The control experiments associated with the applied potential, the molar ratio of HAuCl 4 to PdCl 2 , electrodeposition time, and concentration of l -glutamic acid were investigated in details. Meanwhile, the electrochemical experiments demonstrate the superior electrocatalytic activity of the Au–Pd heterostructures toward methanol oxidation, achieving a maximum catalytic current density of 45.8 mA cm −2 in the presence of 0.5 M methanol, much larger than those on pure Au (5.4 mA cm −2 ) or Pd (25.0 mA cm −2 ) under the same conditions.
研究领域:
材料科学
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电化学
·
催化领域
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Jinyu Huang,Jiaxi Zhou,Zhenhua Liu,Xuejin Li,Youfu Geng,Xiaoqing Tian,Yu Du,Zhengfang Qian
ZnO nanorods doped by different amount of Au and Pd were successfully synthesized via one-step microwave-assisted hydrothermal method. The structure, morphology and composition of the as-synthesized products were characterized by X-ray diffraction (XRD), field-emission electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Gas sensors based on ZnO and Au/Pd-doped ZnO nanorods were fabricated and their gas sensing properties were tested for various gases. The results indicate that the incorporation of Au and Pd elements can greatly enhance the gas sensing properties of ZnO sensors. Specifically, the sensor based on 2.0 wt% Au-doped ZnO exhibits the highest response, quickest response and recovery characteristics, best selectivity, low operating temperature, as well as good long-term stability towards acetone. After incorporation of Au (2.0 wt%), the detection limit of Au-doped ZnO sensor decreases to 5 ppb and the response increases to 17 under 1 ppm acetone at 150℃, which is more than triple the responses of ZnO sensor. The results demonstrate that the developed Au-doped ZnO sensor has great potential for ppb-level acetone detection in human breath for diagnosing diabetes.
研究领域:
材料科学
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医学
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传感技术
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DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2024
·
IF 1.6
Yubo Yang,Yanxia Zheng,Lu Cai,Yuchao Li,Rui Xu,Cuncun Zuo,Haofei Huang,Ming Wang,Ruihui Dai,Liping Zhang,Yansong Zhao
Au-Pd alloy particles supported on TiO 2 were synthesized by the sol-immobilized method and their confirmation was achieved through transmission electron microscope (TEM) and energy dispersive spectrometer (EDS) mapping. The samples were subjected to oxidative esterification of methacrolein with methanol to methyl methacrylate (MMA). Notably, a remarkable enhancement of catalytic performance was found in the presence of Pd. Among the samples tested, the sample Au 0.25 Pd 0.75 /TiO 2 exhibited the highest catalytic performance. The interaction between Au and Pd demonstrated a synergistic effect, with Pd contributing to the stability of Au nanoparticles and strengthening the production of active oxygen species, which facilitated the efficient removal of hydrogen from intermediate hemiacetal. Furthermore, a probable reaction mechanism was proposed to explain these observations.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
hanchi Ma,Hao Wang,Xiya Yan,Bin Liu,Jianhui Yang
Au@Pd@Pt core-shell nanoparticles (CSNs) with mesoporous structures and nanocavities were synthesized through a seed-mediated growth method. The process involved the initial formation of Au@Pd CSNs via the reduction of PdCl₄²⁻ by ascorbic acid (VC), followed by a reduction of PtCl62- by VC and a galvanic replacement reaction between the Pd shell and PtCl₆²⁻. The galvanic replacement reaction is a critical step in the formation of Au@Pd@Pt CSNs featuring distinctive void in the mesoporous structures. The electrocatalytic performance of the as-synthesized Au@Pd@Pt CSNs for the ethanol oxidation reaction (EOR) was systematically evaluated. Due to the unique hierarchical structure featuring both mesoporosity and internal nanocavities, the Au@Pd@Pt CSNs exhibited significantly enhanced electrocatalytic activity compared to Au@Pd CSNs, Au@Pt CSNs, and commercial Pd/C catalysts. This work presents a facile strategy for constructing hierarchical core-shell nanostructures, demonstrating considerable potential for application in electrocatalytic ethanol oxidation.
研究领域:
纳米材料
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电催化
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能量转换
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燃料电池
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Jin Wang,Peina Zhang,Yujiao Xiahou,Dayang Wang,Haibing Xia,Helmuth Möhwald
The present work introduces a new way to prepare Au–Pd alloy nanowire networks (NWNs) via deposition of Pd atoms onto Au nanowires in reaction media at room temperature without the aid of additional reducing agents. Thanks to their excellent colloidal stability in water as well as in ethanol, the resulting NWNs can be utilized to produce composite thin films with Nafion (perfluorinated sulfonic acid) with dimensions above dozens of square centimeters by means of solution casting on the glass substrate. Most importantly, these films can be easily transferred onto different solid substrates by lift-off technology. Moreover, the resulting Au–Pd alloy NWNs can also be easily and thoroughly loaded into macroscopic carbon fiber cloth (CFC). Both the Au–Pd alloy NWN/Nafion composite film and the Au–Pd alloy NWN-loaded CFC can be used as flexible electrodes for electrocatalysis of ethanol oxidation, with electrocatalytic performance at different distorted states superior by 2 orders of magnitude to those reported in the literature (e.g., commercial Pd/C catalysts and Pd-based nanostructured catalysts). This work opens new possibilities for the large-scale manufacturing of electrodes for fuel cells.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Guangliang Niu,Fangyan Liu,Yun Yang,Yunzhi Fu,Wei Wang
Multimetallic nanomaterials have many applications. The controlled synthesis of multimetallic nanomaterials is highly desired. We report a study on using penta-fold twinned (PFT) Au nanorods (NRs) as seeds to synthesize PFT Pd-Au-Pd segmental NRs. The results show that the different crystal structures of seeds, I − and cetyltrimethylammonium bromide (CTAB) significantly affect the deposition of Pd on seeds surface. The PFT Pd-Au-Pd segmental NRs showed excellent surface-enhanced Raman scattering (SERS) performance and improved catalytic activity. Our research is of great significance for the synthesis of similar nanostructures, and we also shown that PFT Pd-Au-Pd segmental NRs might have potential applications in studying the process of organic reaction.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Ya Zhang,Yanying Zheng,Nansheng Li,Xiaolin Yang,Mingyuan Gao,Yun Zhang,Yali Yuan
The development of plasmonic nanozymes with light-controlled catalytic activity is crucial for advancing antibacterial therapy and microbial identification. Herein, we synthesized core–shell Au@Pd nanoparticles (Au@Pd NPs) with plasmon-enhanced activity for bacterial elimination and detection. The thin and porous Pd shell of Au@Pd NPs provided active sites and allow sufficient light to reach Au core. Under visible light, the peroxidase (POD)-like activity of Au@Pd NPs was significantly enhanced, with K m values decreased by 10 % (for TMB) and 15 % (for H 2 O 2 ), while V max increased by 2.1- and 2.8-fold, respectively, compared to dark conditions. The enhanced POD-like activity of Au@Pd NPs, mainly attributed to the hot charge carriers that enable efficient reactive oxygen species (ROS) generation, achieved 100 % killing efficiency against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). By contrast, killing rates reached only 90 % for E. coli and 80.1 % for S. aureus under dark conditions, indicating excellent light-responsive antibacterial activity. Moreover, the successful discrimination of six microorganisms was also obtained using the Au@Pd-TMB-H 2 O 2 system. Based on their different inhibitory effects on TMB oxidation, absorbance values at 652 nm and 452 nm were used as the sensing channels to capture the fingerprint spectra of each microorganism. Results of principal component analysis (PCA) and hierarchical cluster analysis (HCA) confirmed enhanced microbial identification under light. These findings highlight the promise of light-activated nanozymes for integrated antibacterial treatment and precise microbial sensing.
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产品关联
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 23
·3636-3643
·
IF 4.724
Zhenyou Gui,Wenrong Cao,Shunmugavel Saravanamurugan,Anders Riisager,Lifang Chen,Zhiwen Qi
Graphical Efficient noble alloy : Au–Pd supported on zinc hydroxycarbonate (ZOC) catalysts shows high activity for 5-hydroxymethylfurfural oxidation. The basicity of ZOC can play a crucial role in enhancing the yield of FDCA. Moreover, Au–Pd/ZOC can be recycled at least six times without significant loss of its activity. Bimetallic catalysts with Au–Pd supported on zinc hydroxycarbonate (ZOC) were synthesized by a simple deposition–precipitation method and analyzed by transmission electron microscopy to have a narrow-size distribution of predominantly 1–2 nm. The prepared Au–Pd/ZOC catalysts exhibited excellent activity towards 5-hydoxymethylfurfural (HMF) oxidation in water in the presence of the base NaHCO 3 at benign conditions of 80 °C and 3 bar O 2 , resulting in quantitative yield of 2,5-furandicarboxylic acid (FDCA). The addition of base not only enhanced the yield of FDCA but also stabilized the support ZOC by preventing ZOC from the reaction with formed carboxylic acid intermediates/products, thus allowing Au–Pd/ZOC to be recycled for at least six times without significant loss of activity. The basicity of ZOC could play an important role in obtaining the improved yield of FDCA as compared to other supports.
研究领域:
催化化学
·
绿色化学
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化学工程
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材料科学
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有机合成
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环境科学
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DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 5
·1448
·
IF 2.475
Han Song,Zhijie Luo,Mingyao Liu,Gang Zhang,Wang Peng,Boyi Wang,Yong Zhu
In the present work, centrifugal deposited Au-Pd core-shell nanoparticle (NP) film was proposed for the room-temperature optical detection of hydrogen gas. The size dimension of 44, 48, 54, and 62 nm Au-Pd core-shell nanocubes with 40 nm Au core were synthesized following a solution-based seed-mediated growth method. Compared to a pure Pd NP, this core-shell structure with an inert Au core could decrease the H diffusion length in the Pd shell. Through a modified centrifugal deposition process, continues film samples with different core-shell NPs were deposited on 10 mm diameter quartz substrates. Under various hydrogen concentration conditions, the optical response properties of these samples were characterized by an intensity-based optical fiber bundle sensor. Experimental results show that the continues film that was composed of 62 nm Au-Pd core-shell NPs has achieved a stable and repeatable reflectance response with low zero drift in the range of 4 to 0.1% hydrogen after a stress relaxation mechanism at first few loading/unloading cycles. Because of the short H diffusion length due to the thinner Pd shell, the film sample composed of 44 nm Au-Pd NPs has achieved a dramatically decreased response/recovery time to 4 s/30 s. The experiments present the promising prospect of this simple method to fabricate optical hydrogen sensors with controllable high sensitivity and response rate at low cost.
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DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Jun Li,Xiaosi Liang,Chenyang Zhao
Pd is a promising anodic catalyst for direct formic acid fuel cells, while its performance on formic acid electrooxidation is still suffered from for low catalytic efficiency and durability. In this work, an electrochemical self-catalyzed method was employed to deposit Au single-atoms onto Pd nanocrystals with tuneable compositions . Spherical-corrected Scanning transmission microscope and electrochemical characteristics demonstrated that the Au atoms were atomic-dispersive on Pd nanocrystals, forming Au-Pd single-atom alloy. Systematic studies showed that the activity of Pd x @Au y /C SAA is related to the density of the Au single-atoms on Pd surface. When an optimized balance between active-site exposure and intrinsic activity is achieved, the Pd 50 @Au 1 /C SAA showed superb formic acid electrooxidation activity of 4.98 A mg −1 M and unusual high anti-poisoning ability which is distinctly different from most of the Pd based catalysts. The boosted electrochemical performances of Pd x @Au y /C SAA can be attributed to the unique geometric effect that facilitates the direct reaction route and favourable electronic effect that weakens the CO adsorption to Pd sites.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2024
·Vol. 36
·期 10
·e202400028
·
IF 2.7
Suning Man,Junying Zheng,Yi Zhang,Lei Huang,Xiaoping Wu
Given the high solubility and mobility of hexavalent chromium in the environment and edible plants, the development of a suitable method for the screening and quantification of Cr(VI) is highly desirable. Herein, a selective and sensitive sensing method for detecting Cr(VI) in food grains was established, using an electrodeposited gold-palladium bimetallic nanoparticles (BNPs) based electrochemical sensor and a microwave digestion procedure for chromium dissolution. The sensor interface was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and cyclic voltammetry. The results indicate that the fabricated sensor has a larger active surface area and an enhanced electrocatalytic effect compared to the monometallic modification, leading to a significant increase in the electrochemical reduction current of Cr(VI) as a consequence of synergistic effects. Using square wave anodic stripping voltammetry, the sensor demonstrates a wide linear range (5–3000 μg L −1 ) and a low detection limit of 2.7 μg L −1 for Cr(VI), as well as considerable repeatability and stability. Satisfactory selectivity towards Cr(VI) was also demonstrated, even in the presence of 500-fold Cr(III) and 100-fold common heavy metal ions like Cd(II), Pb(II), and Hg(II). The proposed sensing method offers a promising alternative for rapidly identifying toxic Cr(VI) in water and food grains.
研究领域:
环境监测
·
食品安全
·
电分析化学
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纳米材料
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传感器与生物传感器
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 59
·36923-36928
·
IF 3.108
Yueyue Yin,Yong Yang,Liangzhu Zhang,Yongsheng Li,Zhiyuan Li,Weiwei Lei,Yunfeng Ma,Zhengren Huang
Here, we report a facile synthesis of Pd/Au nano-dogbones (NDBs) by loading massive Pd nanoparticles on the two ends of Au nanorods (NRs) via a seed-mediated method. The as-prepared samples were investigated by using TEM, elemental analysis, UV-vis and FDTD simulation. The photocatalytic activity of Pd/Au NDBs was assessed by dehydrogenation of formic acid under visible-to-NIR light irradiation. The Pd/Au NDBs shows much higher enhanced reaction activity compared with samples with core–shell structure due to the increased electron and hole pair separation and total catalytic sites. More importantly, the introduction of Au NRs broadens the photoresponse range and improves the utilization of sunlight efficiently. This finding provides a rational approach to improve photocatalytic performance by forming dogbone structures via integrating plasmonic metals and conventional catalysts.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
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