Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 13
·3104-3110
·
IF 0.7
He Jianyun,Sheng Xueliang,Jiang Yunbo,Zhang Aimin,Li Niangxiu,Liu Feng
Abstract A novel in-situ route was developed to load palladium nanoparticles on the graphene oxide in this paper. Palladium ions was immobilized on graphene oxide by cation exchange, then the palladium nanoparticles supported on reduced graphene oxide (Pd NPs-rGO) was prepared via the Suzuki coupling reaction to in situ formed Pd NPs without applying additional reductants, the approach is considerably more convenient and environmentally benign compared to conventional methods for the preparation of supported metal nanoparticles. To explaining the structure and morphology, the Pd NPs-rGO nanocatalyst was characterized by FT-IR, XPS, TEM, and ICP-AES measurements. The outcomes indicate that the Pd 0 and Pd 2+ are spread on the surface of rGO, and their ratio would affect the catalytic activity. Pd NPs-rGO has excellent catalytic performance in Suzuki coupling reaction with high yields and it could be recovered by centrifugation. Moreover, the catalyst can be recycled seven times without significant loss of activity.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Ling Shi,Zefeng Wang,Xianlan Chen,Guangming Yang,Wei Liu
The synthesis of noble metal nanoparticle with controlled shapes is an attractive goal in developing highly active catalysts. However, constructing high-quality noble metallic nanocatalysts with good electrocatalytic activity remains a huge challenge to date. In this research work, the high-quality polyaniline functionalized graphene nanosheets (PANI/GNS) were prepared by an interfacial polymerization method. The abundant -NH2 groups onto the surface of resulted PANI/GNS nanocomposites, and can be used as active site for growing high load rate of Pd nanoparticles (NPs). Subsequently, Pt NPs were successfully deposited on the Pd surface formed Pt-Pd/PANI/graphene nanosheets (Pt-Pd/PANI/GNS) composites. Interestingly, the shape of Pt-Pd bimetallic can be effectively controlled by simply changing the reaction parameters. The shape and structure of nanocatalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The electrocatalytic properties of nanocomposites were characterized by cyclic voltammetry (CV). The TEM images show that the Pt-Pd nanoflowers were successfully decorated onto the surface of PANI/GNS nanocomposites. The electrocatalytic properties for dioxygen and methanol of prepared Pt-Pd/PANI/GNS nanocatalyst were investigated. The electrochemical results show that the nanocatalysts exhibit higher electrocatalytic activity for methanol oxidation and dioxygen reduction.
研究领域:
材料科学
·
能源化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 38
·15931-15937
·
IF 0
Zhongyang Zhang,Qingzhong Xue,Yonggang Du,Cuicui Ling,Wei Xing
Graphene nanoribbons (GNRs) have been of great interest in a wide range of device applications for their novel physical, electronic and spin transport properties. Here we study the hydrogen (H2) sensing properties of GNRs decorated with palladium (Pd) nanoparticles by a one-step chemical modification and reduction process. A novel Pd-GNR film/SiO2/Si structure was fabricated by transferring a Pd-GNR film onto a heavily doped Si substrate with a native oxide layer. It is demonstrated that the Pd-GNR film/SiO2/Si structure exhibits highly enhanced responses to H2 than the pristine Pd-GNR film at parts-per-million (ppm) concentration levels at room temperature. For example, the Pd-GNR film/SiO2/p-Si structure shows an excellent response (ΔR/Rair) of ∼94% to 100 ppm H2 in air. The sensing mechanism was proposed to explain these H2 sensing characteristics based on p–n junction theory. Our findings demonstrate the incorporation of nanoparticles in GNR-based gas sensors through chemical functionalization and present a novel strategy for the application of GNRs in high performance gas sensors.
研究领域:
材料科学
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传感器技术
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纳米科技
✓ 已验证
DOI
Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 9
·1944-1950
·
IF 0.791
Zhang Yuanyang,Bao Kun,Wang Xuchao,Wang Linqi
Abstract A series of Ru and Ru–Pd supported samples on deep desulfurization, especially thiophene-like compounds, were prepared by wet impregnation method. It indicated that the suitable Ru content on the support could be 1.5 wt % (Ru(1.5)/Al 2 O 3 ) under used experimental conditions. The effects of Pd on Ru(1.5)/Al 2 O 3 sample showed that the suitable content of Pd was probably 0.3 wt % (Ru(1.5)–Pd(0.3)/Al 2 O 3 ), and its breakthrough sulfur capacity could be reached to 1.244 g S /kg Cat . XPS and SEM characterization over fresh and used samples of Ru(1.5)–Pd(0.3)/Al 2 O 3 indicated that it had good stable structure. Furthermore, it indicated that the adsorption isotherm model of Freundlich equation was well fitted the experimental data ( R 2 = 0.989) and the parameters of Freundlich equation were obtained by linear regression.
研究领域:
催化化学
·
环境工程
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Tan Xiaofeng,Zhang Lianhua,Tang Qiaorong,Zheng Gengxiu,Li He
A nanozyme-linked immunosorbent assay is described for cardiac troponin I which is a biomarker for myocardial infarction. The method is based on the use of Pd-Ir nanocubes with excellent peroxidase-like activity. The nanocubes catalyze the oxidization of nonfluorescent o-phenylenediamine (OPD) by H 2 O 2 to form a yellow fluorescent product (oxOPD) with excitation/emission maxima at 400/570 nm. Carbon dots are added as a reference fluorophore. Under the same excitation wavelength, they display blue fluorescence (450 nm). The ELISA uses the Pd-Ir nanocubes as a label for the secondary antibody and OPD as substrate. The ratio of fluorescence intensities at 570 and 450 nm increases in the 1 pg·mL −1 to 1 ng·mL −1 cardiac troponin I concentration range, and the detection limit is 0.31 pg·mL −1 . The method was applied to analyze spiked serum samples, and the results compared well with those obtained by a commercial chemiluminescence assay.
Schematic presentation of the ratiometric fluorescence immunoassay for cardiac troponin-I. Pd-Ir nanocubes were employed to fabricate nanozyme-based signal labels for its excellent peroxidase-mimicking activity.
研究领域:
生物化学
·
医学诊断
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 56
·29563-29570
·
IF 3.708
Jingjing Lin,Tao Mei,Meijiao Lv,Chang'an Zhang,Zhenfeng Zhao,Xianbao Wang
A simple two-step method for the preparation of Pd nanoparticles supported on reduced graphene oxide (Pd/RGO) is reported. Well-dispersed and size-controlled Pd/RGO was synthesized through reduction of PdO nanoparticles on graphene oxide (PdO/GO) with hydrazine hydrate and ammonia at 80 °C for 4 hours. The PdO/GO was successfully prepared by mixing GO and Pd(NO3)2 aqueous solution together without adding any additional chemicals. The sizes and morphologies of PdO nanoparticles can be controlled by changing the concentrations of Pd(NO3)2, reaction temperatures and times. The results suggest that a small scale increase of the loadings of Pd supported on RGO can significantly improve the catalytic activity of Pd/RGO, and the stability is much better than that of commercial Pd/C catalysts for methanol electrooxidation and the Suzuki reaction.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jiqiu Zhang,Guanyin Zhang,Liang He,Yuzhen Shi,Rongrong Miao,Yuanzhi Zhu,Qingqing Guan
Acetylene hydrogenation is an important reaction in the petrochemical industry, the key is to develop efficient and selective catalyst. In this work, a highly crystalline layered covalent triazine frameworks (CTFs) with excellent thermal stability was used as carbon support to immobilize ultrasmall Pd nanoparticle for semihydrogenation of acetylene. Downsizing the particle sizes were realized by dual-solution assisted precursor mixture and using H 2 instead of NaBH 4 as reducing agent. The pore confinement effect of CTFs and the electronic intercalation from N atoms play key roles in improving the catalytic activity and stabilizing the Pd nanoparticles. The Pd/CTFs-H 2 catalyst exhibits 100% acetylene conversion and 99.9% ethylene selectivity at 250 °C and space velocity of 110,000 h −1 . The life test (>150 h), cycle test and chemical stability test demonstrated the long-term stability of the Pd/CTFs-H 2 . The process mechanism of selective hydrogenation of acetylene in this catalyst is investigated by the in-situ infrared spectra .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2022
·Vol. 16
·期 6
·2200017
·
IF 3.277
Sheng Huang,Husheng Shan,Wufan Xuan,Wenjie Xu,Dunan Hu,Lei Zhu,Cheng Huang,Wanghua Sui,Chunjin Xiao,Yulong Zhao,Yinghuai Qiang,Xiuquan Gu,Jian Song,Chang Zhou
The humidity sensors based on metal halide perovskite have achieved outstanding improvement. However, there are few reports of perovskite nanocrystals for humidity sensors. Herein, CsPdBr 3 nanocrystals with high surface-to-volume ratio are synthesized by the in situ spin-coating method. Subsequently, the humidity sensor based on CsPdBr 3 nanocrystals is prepared and the response mechanism is demonstrated to originate from the formation of the Pd––O bond on the surface by performing density functional theory calculation. The humidity sensor shows a fast response/recovery time of 0.68/2.43 s in a relative humidity range from 88.9%RH to 4.7%RH; the fast response/recovery properties are used to monitor human respiratory and noncontact switch. Moreover, the hydromechanical characteristics of unsaturated soil are obtained by noncontact testing with the humidity sensor for the first time in geological engineering, and the strong correlation between relative humidity and hydromechanical characteristics is revealed by mathematical derivation, which lays the theoretical foundation for the noncontact real-time sensing of hydromechanical characteristics of unsaturated soil. These findings not only open the door to the development of perovskite nanocrystals materials for humidity measurement, but also offer a new method for nondestructive and real-time test of the mechanical properties of soil in geological engineering.
研究领域:
材料科学
·
地质工程
·
传感器技术
✓ 已验证
DOI
高影响因子
Biomaterials Science
·
2022
·Vol. 10
·期 23
·6804-6817
·
IF 7.59
Guiyin Li,Wenzhan Li,Shengnan Li,Xinhao Li,Xiaoqing Yao,Wen Xue,Jintao Liang,Jiejing Chen,Zhide Zhou
Glypican-3 (GPC3) is a membrane-associated proteoglycan that is specifically upregulated in hepatocellular carcinoma (HCC) and has become one of the most promising biomarkers closely related to the occurrence and development of HCC. In this work, platinum@palladium nanoparticles decorated with hemin-reduced graphene oxide (H-rGO-Pt@Pd NPs) were used not only as a support for GPC3 aptamer (GPC3Apt) immobilization, but also as a new redox nanoprobe in electrochemical analysis for the determination of GPC3. The electrochemical aptasensor involved a reaction cell with a three-electrode system, and the differential pulse voltammetry (DPV) technique was adopted. In the presence of GPC3, the formed GPC3Apt–GPC3 complexes had stable structures and were cleaved from the electrode surface, leading to more electroactive H-rGO-Pt@Pd NPs repelling freely from the GPC3Apt/H-rGO-Pt@Pd NPs and thus to the increase of the oxidation peak current of hemin in H-rGO-Pt@Pd NPs. Under optimal conditions and a working voltage of +700 mV (vs. Ag/AgCl), the label-free electrochemical GPC3 aptasensor showed superior performance with a wider concentration linear range (0.001–10.0 μg mL−1), a lower limit of detection (LOD) (0.181 ng mL−1, S/N = 3), a higher sensitivity (0.0446 μA μM−1 cm−2) and good selectivity. Furthermore, the fabricated aptasensor was applied to GPC3 determination in human serum samples with satisfactory recoveries of 94.3%–119% and RSDs of 0.15%–5.78%. The current work provides a flexible approach for the rapid and sensitive analysis of GPC3 and has a broad application prospect in the diagnosis of HCC.
研究领域:
生物医学工程
·
分析化学
·
肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 20
·6732-6741
·
IF 6.119
Yafeng Chen,Guimin Jiang,Xiangzhi Cui,Zuotai Zhang,Xinmei Hou
Eliminating indoor formaldehyde (HCHO) pollution at room temperature is highly needed to improve the environment while saving energy. Herein, Pd/CeO2 catalysts with different morphologies of the CeO2 support were employed to investigate their performance for HCHO oxidation. The Pd/CeO2 nanocube (Pd/CeO2-C) catalyst exhibited excellent catalytic activity compared to commercial CeO2 and CeO2 nanorods. HCHO can be completely converted into CO2 and H2O over the Pd/CeO2-C (0.64 wt% Pd) catalyst at a weight hourly space velocity of 36 000 mL g−1 h−1 at room temperature. Multiple characterization results confirmed that the strong interfacial interaction between Pd and the CeO2-C support guarantees a high percentage of metallic Pd on the CeO2-C surface and its high dispersion, which is crucial for the oxidation of formaldehyde at low temperature. The in situ diffuse reflectance infrared Fourier transform results indicated that CO, formate and dioxymethylene species are the main intermediates over the Pd/CeO2-C catalyst, and the active O species is responsible for their decomposition and oxidation. This work may promote the practical application of high performance Pd-based catalysts for indoor HCHO purification and related catalytic processes.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Hong Jiang,Songlin Xue,Yefei Liu,Weihong Xing,Rizhi Chen
The Pd@ZIF-L catalysts with uniform crosshair-star shape and a size of about 20 μm were synthesized by an assembly method, in which a two-dimensional layered zeolitic imidazolate framework-L (ZIF-L) was used as the support to immobilize Pd nanoparticles . Their catalytic activities were evaluated by the catalytic reduction of p -nitrophenol to p -aminophenol. The results highlight that the physical-chemical and catalytic properties of the Pd@ZIF-L catalysts are greatly affected by the synthesis temperature. The temperature variation can make the catalysts transform from two-dimensional flakes to zero-dimensional spheres. High temperature is beneficial for increasing Pd loading and encapsulating Pd nanoparticles within the ZIF-L matrix. However, under the temperature larger than 30 °C, the dense dia(Zn) structures are formed. Increasing Pd loading in the Pd@ZIF-L catalysts leads to a significantly higher p -nitrophenol conversion. The relative dense structure of the as-synthesized catalysts makes p -nitrophenol access the active centers difficultly and a lower catalytic activity is observed. These findings would aid the development of high-performance Pd@ZIF-L catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Fei Wang,Jiangge Teng,Zixu Li,Chao Fang,Kai Ma,Yanxiong Ke,Qiang Jia,Changhu Chu
A facile and readily available Fe-ppm-Pd/C catalyst has been developed for catalyzing Suzuki-Miyaura cross-coupling reactions. When combined with dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl) phosphine (SPhos), this catalyst, with low levels of palladium (as low as 180 ppm), efficiently facilitates cross-coupling reactions between aryl boronic acids (or aryl neopentyl-1,3-diol boronic ester) and a wide range of aryl halides, including inactivated aryl chlorides. Additionally, the recovered Fe-ppm-Pd/C catalyst has demonstrated sustained catalytic activity over four runs, indicating minimal decline in performance. This suggests the catalyst's potential for long-term use and its practicality in industrial applications.
研究领域:
有机化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）