ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Lianghao Li,Zhuangpeng Huang,Xiaoxiao Fan,Zhen Zhang,Rongni Dou,Shulong Wen,Yuan Chen,Yuancai Chen,Yongyou Hu
An optimized metal oxide electrode (Ti/SnO 2 -Sb-Pd) was prepared via thermal decomposition and used in the electrochemical degradation of Ni-EDTA. The electrode was characterized by SEM, XRD, XPS, and electrochemical characterizations including linear-sweep voltammetry (LSV), cyclic voltammetry (CV) and chronopotentiometry (CP) techniques. It was found that Pd doping could effectively change the surface morphology and lattice parameters of the metal oxide electrode. Pd can facilitate the entry of more Sb into SnO 2 crystals and promote the reduction of Sb from the +5 to the +3 state. The interaction of these metals raised the oxygen evolution potential (OEP) and electrochemical surface area of the electrode, in addition to reducing the degradation potential and increasing the degradation current of Ni-EDTA. When the molar ratio of Pd:Sn was 2.5%, the electrode could simultaneously degrade 87.5% of Ni-EDTA and recycle 17.9% of elemental Ni on the cathode within 120 min. At the same time, with Pd doping, the lifetime of the electrode was increased more than 40 times, demonstrating good potential for application in industry.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 31
·11077-11084
·
IF 7.367
Yalin Xiong,Yanling Ma,Junjie Li,Jingbo Huang,Yucong Yan,Hui Zhang,Jianbo Wu,Deren Yang
Bimetallic nanocrystals with a branched shape have received great interest as catalysts due to their unique structures and fascinating properties. However, the conventional synthetic approaches based on the island growth mode often lead to the dendritic nanostructures with inhomogeneous and uncontrolled branches. Here precise control over the number of branches has been realized in the deposition of Pt on Pd seeds through the Stranski–Krastanov growth mechanism. Based on such a growth mode, Pd@Pt core–shell hexapods and octapods have been generated by a seeded growth with Pd octahedra and cubes as the seeds, respectively. We found that Pt atoms are initially deposited on the side faces of Pd seeds through a layer-by-layer epitaxial growth in the presence of oleylamine (OAm), leading to a local strain focused at their corners. These strain-concentrated sites promote the subsequent island growth of Pt atoms at the corners of the Pd seeds, resulting in the Pd@Pt core–shell hexapods or octapods. Both the Pd@Pt core–shell hexapods and octapods exhibit the substantially enhanced catalytic properties in terms of activity and stability towards a methanol oxidation reaction (MOR) relative to the commercial Pt/C. Specifically, the Pd@Pt core–shell hexapods show the highest specific (1.97 mA cm−2) activity and mass activity (0.52 mA μgPt−1) for the MOR, which are 5.8 and 2.6 times higher than those of the commercial Pt/C, respectively. This enhancement can probably be attributed to their unique structures and the synergistic effect between Pt and Pd.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9233-9240
·
IF 8.867
Jun Jiang,Han Gao,Shu Lu,Xing Zhang,Chu-Ya Wang,Wei-Kang Wang,Han-Qing Yu
Fabrication of non-Pt high-performance oxygen reduction reaction (ORR) catalysts is essential for the application of fuel cells. In this work, monodisperse bimetallic Ni–Pd core–shell nanoparticles (NPs) with tunable shell compositions and contents were synthesized by using a modified one-pot colloidal approach and characterized. Also, the core shell structure dependence of their ORR performance without the interruption of an intermetallic phase was explored. The core–shell structured catalysts (Ni@Pd3/C NPs) exhibited a robust ORR activity and stability with a high onset potential of 0.99 V, a half-wave potential of 0.87 V and an average electron transfer number of 3.91 in 0.1 M HClO4. Furthermore, a high onset potential of 0.98 V, a half-wave potential of 0.86 V and an average electron transfer number of 3.98 were achieved in 0.1 M KOH. These results are comparable to those of the commercially available Pt/C catalysts. Moreover, the catalysts also maintained a good long-term cycling stability in both acidic and alkaline electrolytes. Thus, this work demonstrates that the ORR performance of the Ni–Pd alloy could be boosted through constructing the core–shell structure with a Pd-enriched surface and the Ni–Pd model alloy could be further applied to assess the role of the Pd-based core–shell structure in other electrochemical catalytic reactions.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Qinrui Fu,Yuan Meng,Zilin Fang,Quanqin Hu,Liang Xu,Wenhua Gao,Xiaochun Huang,Qiao Xue,Ya-Ping Sun,Fushen Lu
Boron nitride nanosheets (BNNS) were used to anchor bimetallic Pd–Fe nanoparticles for Suzuki–Miyaura coupling catalysts. The bimetallic nanoparticles were found to be core–shell in structure, and their formation was likely facilitated by their interactions with the BNNS. The Pd–Fe/BNNS catalysts were highly effective in representative Suzuki–Miyaura reactions, with performances matching or exceeding those of the state-of-the-art methods. Specifically, the superior catalytic activities were characterized by generally shortened reaction times, minimal Pd usage, excellent reusability of the catalysts and high or nearly quantitative conversion yields in a benign solvent system without the need for any special conditions, such as ligands and surfactants or inert gas protection. The obvious advantages of the Pd–Fe/BNNS over similar catalysts based on other supports, such as reduced graphene oxide (rGO), suggest that BNNS may be developed into a versatile platform for many other important catalytic reactions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Xueyuan Li,Xuezhong Du
The molybdenum disulfide (MoS 2 ) nanosheets supported Au-Pd bimetallic nanoparticles were synthesized using a facile thermal co-reduction method. The Au-Pd/MoS 2 nanocomposites showed good electrocatalytic activities toward the reduction of hydrogen peroxide (H 2 O 2 ) in neutral solution and the oxidation of glucose in alkaline solution, attributed to the synergistic effects of the Au-Pd bimetallic nanoparticles and MoS 2 nanosheets. The fabricated non-enzymatic electrochemical sensors exhibited the linear responses of H 2 O 2 and glucose in the concentration ranges of 0.8 μM–10 mM and 0.5–20 mM with the detection limits of 0.16 μM and 0.40 mM (S/N = 3), respectively, together with good stability and reproducibility. The Au-Pd/MoS 2 nanocomposites provide new potential materials for the development of other non-enzymatic sensors.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2016
·Vol. 146
·期 9
·1792-1799
·
IF 2.294
Wang Peng,Wang Guang-Yu,Qiao Wen-Long,Feng Yi-Si
Abstract In this study, palladium (0) nanoparticle supported on mesoporous carbon (Pd/MPC) is prepared by impregnation and H 2 reduction. Characterization by XRD, XPS and TEM reveals the mesoporous structure and a high dispersion of palladium nanoparticles (about 4.8 nm) in the mesopores. The catalyst has excellent catalytic activity and stability for Sonogashira reactions of aryl halide (–I, –Br) in aqueous solution. It is noteworthy that Sonogashira reactions of aryl halide (–Cl) can occur by using the novel Pd/MPC catalyst. Meanwhile, the catalyst can be recovered and reused without loss of efficiency until the fifth cycle in water. The fresh catalyst would be of major significance for industrial applications. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Shuaishuai Ding,Chunhua Zhang,Yefei Liu,Hong Jiang,Weihong Xing,Rizhi Chen
We reported a Pd@CN catalyst made of Pd nanoparticles supported on a N-doped carbon derived from ZIF-67. The CN materials with micro/mesoporous structures were well developed for the loading of Pd nanoparticles and improving the catalytic performances. With the increase of calcination temperature of ZIF-67, the BET surface of CN materials initially increased and then reduced. Moreover, the higher calcination temperature would lead to lower nitrogen content in CN materials, causing lower selectivity of phenol hydrogenation to cyclohexanone. Our Pd@CN 600 catalyst achieved a conversion of ca. 95% and a selectivity of ca. 95%, and exhibited excellent stability during recycling experiments.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jiayin Gao,Yaoyao Wang,Yuqing Yu,Mengxiang Zhu,Wen Kong,Genyan Liu,Xiaogang Luo
Catalytic reduction of p -nitrophenol is usually carried out using transition metal nanoparticles such as gold, palladium , silver , and copper, especially palladium nanoparticles (Pd NPs), which are characterized by fast reaction rate, high turnover frequency , good selectivity, and high yield. However, the aggregation and precipitation of the metals lead to the decomposition of the catalyst, which results in a significant reduction of the catalytic activity. Therefore, the preparation of homogeneous stabilized palladium nanoparticles catalysts has been widely studied. Stabilized palladium nanoparticles mainly use synthetic polymers . Cellulose microspheres , as a natural polymer material with low-cost and porous fiber network structure, are excellent carriers for stabilizing metal nanoparticles . Cellulose microspheres impregnated with palladium metal nanoparticles were carbonized to have a larger specific surface area and highly dispersed palladium nanoparticles, which exhibited excellent catalytic activity in the catalytic reduction of p -nitrophenol. In this work, the cellulose carbon-based microspheres palladium (Pd@CCM) catalysts were designed and characterized by SEM, TEM , EDS, XRD, FTIR, XPS , TGA , BET, and so on. Furthermore, the catalytic performance of Pd@CCM catalysts was investigated via p -nitrophenol reduction, which showed high catalytic activity. This catalyst also exhibited excellent catalytic performance in the Suzuki-Miyaura coupling reaction. Linking aromatic monomer and benzene through Suzuki-Miyaura coupling was presented as an effective route to obtaining biaryls , and the synthesis method is low-cost and simple. In addition, Pd@CCM showed desirable recyclability while maintaining its catalytic activity even after five recycles. This work is highly suggestive of the design and application of the heterogeneous catalyst .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Xiaofeng Liu,Xudong Chen,Chunying Wang,Shaohua Xie,Jingyi Wang,Yaobin Li,Fudong Liu,Hong He
Usually, active hydroxyl groups play a crucial role in the catalytic oxidation of formaldehyde (HCHO), especially on supported noble metal catalyst systems. However, in present work, we observed an unexpected phenomenon where H 2 O exhibited an inhibitory effect on Pd/SiO 2 catalyst for HCHO oxidation. The activity of Pd/SiO 2 catalyst could be significantly improved by constructing Si and O double vacancy-defects (V Si V o , through acid-base etching) and oxygen vacancy defects (V o , through H 2 reduction). Interestingly, the inhibiting effect of H 2 O on HCHO oxidation was completely reversed to a promotion effect on the Pd/SiO 2 -(V Si V o ) catalyst, which was due to the fact that such catalyst had the ability to continuously activate H 2 O producing reactive hydroxyl species. Reaction mechanism study revealed that the HCHO oxidation on all Pd/SiO 2 catalysts followed two reaction pathways: (1) HCHO → HCOO → CO 2 ; (2) HCHO → CHO → CO → CO 2 , while the difference of active hydroxyl content on the catalysts resulted in varying degrees of formate accumulation on the catalyst surfaces. This study provides a promising strategy to enhance the H 2 O resistance of Pd catalysts and design high-performance noble metal catalysts for catalytic HCHO oxidation.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhefei Zhao,Xuyao Yao,Ruopeng Yu,Xingyu Luo,Minhao Chen,Xiangxiang Zhang,Yinghua Xu,Youqun Chu,Xinbiao Mao,Huajun Zheng
Electrocatalytic hydrodechlorination (EHDC) stands out as an economical and prospective technology for eliminating chlorinated organic pollutants. Single-atom catalyst engineering and metal-support interaction (MSI) offer the promising strategies for developing electrocatalysts with high atom utilization and reactivity. Herein, atomically dispersed palladium (Pd) anchored on the iron (Fe)-introduced nickel phosphide (NiFeP) support is reported. The prepared NiFeP-Pd electrode exhibits outstanding electrocatalytic activity in 4-CP removal efficiency (98.8 %) with an ultra-low dosage of Pd (0.0497 mg cm −2 ) and the highest reported MA value (446.01 min −1 g −1 ), surpassing Ni 2 P-Pd by 6.34 times. Experimental results combined with theoretical calculations suggest that the superior performance of NiFeP-Pd stems from the modulated support by Fe introduction, which not only enhances the generation of adsorbed atomic hydrogen species (H*), but also reduces the energy barrier of C-H formation on Pd sites by regulating the MSI. In addition, single-Pd-atom construction on NiFeP with good conductivity and large specific surface area makes the contributions as well.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Qian Guo,Ziyun Su,Dong Xiang,Beirong Yu,Di Wang,Youjun Fan,Fuqin Zheng,Wei Chen
As model catalysts, it is necessary to study the relationship between the structure and properties of ultra-small metal nanoclusters (MNCs) and to reduce their steric hindrance as much as possible, e.g. preparing ultrasmall MNCs protected by ultra-short ligands. However, it is challenging to attain various MNCs with the same cores but different surface stabilizing ligands. Additionally, shortening the chains of protecting ligands will lead to larger MNC cores. Here, four different Pd NCs (Pd 6 (SC 4 H 9 ) 12 , Pd 6 (SC 8 H 17 ) 12 , Pd 6 (SC 6 ( C 2 )H 17 ) 12 and Pd 6 (SC 6 H 13 ) 12 ) were successfully synthesized by a slow synthesis process. All these clusters consist of six Pd atoms and are stabilized by 12 thiols with different chain lengths and steric hindrance. The catalytic properties of the as-prepared Pd 6 NCs were evaluated using the catalytic reduction of p-nitroaniline to p-phenylenediamine as a model reaction. The outcomes indicated that shortening the chain length of the protecting thiols could enhance the catalytic activity of the Pd 6 NCs. Notably, stable and active ultra-small Pd 6 clusters stabilized by ultra-short ligands (HSC 4 H 9 ) were successfully synthesized. Although the performance of Pd 6 (SC 4 H 9 ) 12 clusters protected by the ultra-short thiols is lower than that of commercial palladium on carbon (Pd/C), they display higher stability. Interestingly, the activity of Pd 6 NCs protected by ethyl-branched alkane thiols is also better than that of Pd 6 NCs protected by the alkane thiol ligands with the same chain length or the same number of carbon numbers. This work provides clear evidence that the catalytic activity of atomically precise MNCs can be controlled by regulating the surface stabilizing ligands.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 41
·e202402898
·
IF 1.9
Yuxian Wang,Pengfei Bai,Xian Sheng,Molan Qing,Yuanyang Yi,Zhidong Zhang,Ling Jiang,Liying Zhu
Graphical This study reports an environmentally friendly approach for the extracellular synthesis of Pd−Ag bimetallic nanoparticles (Pd−Ag BNPs) with small size by reduction of Pd and Ag ions using cell-free supernatant of Deinococcus wulumuqiensis . The application of as-prepared bionanocatalyst in catalytic degradation of pollutant dyes demonstrates that Pd−Ag BNPs have excellent degradation ability of 4-nitrophenol and Rhodamine. Catalytic reduction of organic pollutants using metal nanoparticles (MNPs) as nanocatalyst is a promising approach. The widespread application of MNPs have led to an increase demand for their production. The green biosynthesis of MNPs using microbes is becoming increasingly important as they are benign and environmentally friendly. In this work, Deinococcus wulumuqiensis ( D. wulumuqiensis ) with high resistance to stresses was applied for the green preparation of different MNPs, including palladium nanoparticles (Pd NPs), silver nanoparticles (Ag NPs), and Pd−Ag bimetallic nanoparticles (Pd−Ag BNPs). The resultant MNPs exhibited a face-centered cubic structure, with average size of 6.70 (Pd NPs), 6.24 (Ag NPs), and 6.13 nm (Pd−Ag BNPs), respectively. FT-IR spectra indicated that the proteins and polysaccharides expressed by D. wulumuqiensis could potentially contributed to the formation of MNPs. The application of as-prepared biocatalyst in catalytic degradation of pollutant dyes demonstrated that Pd−Ag BNPs had greater degradation ability of 4-nitrophenol (95.1 %) and Rhodamine B (85.1 %) than monometallic nanoparticles. The pseudo-first-order kinetics results further indicated the superior catalytic ability of Pd−Ag BNPs, with rate constant of 0.450±0.009 (4-nitrophenol) and 1.54×10 −2 min −1 (Rhodamine B), respectively. Thus, the present study confirms that D. wulumuqiensis represents a promising candidate for the biosynthesis of Pd-based nanoparticles with small size, which exhibited potential applications as bionanocatalyst in the degradation of water pollutants.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）