CATALYSIS LETTERS
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2017
·Vol. 147
·期 7
·1802-1810
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IF 2.799
Hong Runrun,He Yufei,Miao Chenglin,Feng Junting,Li Dianqing
Abstract Pd–Ir mesocrystals with rough surface and highly branched structure were synthesized through a facile co-reduction method. The morphology evolution shows the mesocrystals were formed by oriented attachment of nanoparticles, and abundant defects sites as well as synergetic effect between building units were formed during mesocrystals oriented attachment process. Therefore, the supported Pd–Ir mesocrystals show a significant enhancement in catalytic performance in hydrogenation of 2-ethylanthraquinone compared with conventional Pd–Ir nanoparticles. The high activity can be ascribed to high densities of defect sites in Pd–Ir MCs catalyst, which facilitated H 2 activation. In addition, the geometric effect of Pd–Ir MCs catalyst was responsible for inhibiting further hydrogenation of eAQH 2 to undesired consecutive byproducts. Graphical Abstract
研究领域:
催化化学
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材料科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Shuhuai Li,Guihao Yin,Xuejin Wu,Chunhua Liu,Jinhui Luo
A novel supramolecular imprinted electrochemical sensor was developed for carbofuran (CBF) determination based on a multiwalled carbon nanotube-supported Pd-Ir nanocomposite catalyst (MWCNT/Pd-Ir) with methylene blue (MB) signal amplification. First, MWCNT/Pd-Ir composite nanoparticles were synthesized and used to modify the surface of a glassy carbon electrode; then, a molecular imprinted polymer for CBF was prepared by electropolymerization , with MB-doped o -phenylenediamine as the functional monomer and a 4-tert-butylcalix[8]arene-CBF (4TB[8]A-CBF) supramolecular complex as the template. The electrical signals were controlled though the elution and re-adsorption of CBF. Due to the double catalysis by the MWCNT/Pd-Ir and MB, the current intensity for CBF was obviously amplified. Additionally, because of the double recognition by the 4TB[8]A and MIP, the sensors showed outstanding CBF identification properties. The method was applied to detect CBF in agricultural products, and the satisfactory results were obtained.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Xuhuai Fu,Yunyao Lu,Yang Peng
Ultrasensitive detection of circulating tumor cells (CTCs) holds significant clinical importance in monitoring metastasis and therapeutic outcomes. In this study, we have developed a novel electrochemical sensing model based on nanomaterials for highly sensitive and specific determination of CTCs. A gold electrode co-modified with Ketjin black (KB) and Au nanoparticles (AuNPs) exhibits exceptional conductivity. By conjugating palladium-iridium cubic nanozyme (Pd–Ir CNE) with antibodies, we have created a detection probe capable of catalyzing hydrogen peroxide (H 2 O 2 ), thereby amplifying the output signal and resulting in significantly enhanced current on the electrode for detecting CTCs. The constructed immunosensor has achieved a detection limit of 2 cell mL −1 for model MCF-7 cells. Furthermore, the as-constructed electrochemical immunosensor can accurately detect whole blood-spiked target CTCs, showing great promise for clinical applications in early cancer diagnosis and prognosis.
研究领域:
医学诊断
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生物材料学
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肿瘤学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2020
·Vol. 38
·期 4
·367-371
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IF 3.826
Penghui Li,Yingyong Wang,Yunwei Wang,Guoqiang Jin,Xiang-Yun Guo,Xili Tong
Summary of main observation and conclusion Selective hydrogenation of α,β-unsaturated carbonyls into saturated carbonyls is important to obtain remunerative products. However, it is still a challenge to achieve high activity and selectivity under mild conditions. Herein, Pd, Ir and bimetallic Pd-Ir nanoparticles were uniformly deposited with high dispersity on the surface of SiC by a facile impregnation method, respectively. The as-prepared Pd/SiC catalysts efficiently hydrogenate cinnamaldehyde to hydrocinnamaldehyde at room temperature and atmospheric pressure, and the activity of Pd/SiC is observed further enhanced by adding Ir component (conversion of 100%). In addition, the dependence of Pd-Ir catalyst activity on Pd/Ir molar ratio confirms a synergistic effect between Ir and Pd, which originates from the electron transfer between Pd and Ir.
研究领域:
催化化学
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材料科学
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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
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医学诊断
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纳米技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Xiaofeng Tan,Qinglai Yang,Ximei Sun,Ping Sun,He Li
Metallic aerogels (MAs), imparting the active catalytic properties of nanostructured noble metals to macroscopic aerogels, draw tremendous interest in diverse fields owing to the unique features of three-dimensional interconnected channels, self-supported architectures, and pure metallic backbones. Moreover, flexible manipulation of compositions, high electrical conductivity, and abundant active sites of MAs contribute to the great potential to mimic natural enzymes. However, the cumbersome synthetic process takes a couple of hours to days, and unavoidable impurities usually impede surface electrons/mass transfer, posing the decrease of stability and enzyme-like activity of MAs. Here, a PdIr bimetallic aerogel prepared in the ethanol phase via spontaneous assembly and a surfactant-free strategy is reported. Gelation kinetics of PdIr aerogels in ethanol is increased with 2–4 orders of magnitude compared to the traditional preparation method in water. Owing to the intrinsic physicochemical properties, PdIr aerogels exhibit the high activity of peroxidase mimics using 3,3′,5,5′-tetramethylbenzidine as a chromogenic probe. In addition, the PdIr aerogels maintain relatively high activity at an elevated temperature and pH of 3–7, demonstrating their good stability and survivability. Utilizing the exceptional peroxidase-like activity of PdIr aerogels, we realized the quantitative bioassay for H2O2 and total antioxidant capacity, indicating enormous potential in the quality evaluation of real samples.
研究领域:
材料科学
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生物医学工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2015
·
IF 4.847
Tao Yang,Yanxia Ma,Qingli Huang,Guojian Cao,Sheng Wan,Na Li,Hong Zhao,Xia Sun,Fujun Yin
In this work, palladium–iridium nanowires with a Pd/Ir atomic ratio of 2/1 are synthesized through a facile hydrothermal method . Transmission electron microscopy images show that the palladium–iridium nanowires have a uniform diameter below 2 nm and a rough surface with many atomic steps. The electro-catalytic performance of the carbon supported palladium–iridium catalyst towards oxygen reduction reaction has been examined in 0.1 M HClO 4 solution. The carbon supported palladium–iridium catalyst displays comparable catalytic activity but much higher durability in comparison with those of the commercial carbon supported platinum catalyst. The excellent electro-catalysis might be attributed to the high accessible area, rough surface and iridium introduction. The work demonstrates that palladium–iridium nanocrystals are promising electro-catalysts for oxygen reduction electro-catalysis in acid media.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2019
·Vol. 7
·期 3
·709-717
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IF 5.934
Wendan Nie,Yixing Luo,Qifeng Yang,Gang Feng,Qilu Yao,Zhang-Hui Lu
Selective dehydrogenation of formic acid (FA, HCOOH) is a promising alternative to fossil fuels, to provide a clean energy carrier for the future energy economy. The preparation of highly efficient catalysts for hydrogen release from FA at room temperature has attracted much attention but still remains a great challenge. Herein, ultrafine bimetallic PdIr nanoparticles (NPs) immobilized by amine-functionalized SBA-15 (PdIr/SBA-15-NH2) have been successfully synthesized via a facile surface functionalization and co-reduction method. The characterized results showed that ultrafine bimetallic PdIr NPs with a small size of around 1.1 nm were highly dispersed on SBA-15-NH2. Among all the as-synthesized catalysts, the optimized Pd0.85Ir0.15/SBA-15-NH2 nanocomposites (NCs) exhibited the highest catalytic activity and 100% H2 selectivity toward the selective dehydrogenation of FA, giving an initial turnover frequency (TOF) value as high as 3087 h−1 at room temperature. To the best of our knowledge, this is the first report showing that the Ir-containing heterogeneous catalyst can achieve a complete dehydrogenation of FA to H2. The excellent catalytic performance of this catalyst might be attributed to the modified electronic effects of Pd with Ir, the ultrafine size and high dispersion of PdIr NPs, and the synergetic interaction between the PdIr NPs and SBA-15-NH2. The amine functional groups of SBA-15-NH2 not only can lead to ultrafine and well-dispersed PdIr NPs and stabilize the PdIr NPs, but also can serve as Brønsted basic sites, which facilitates the O–H bond dissociation of FA and forms a formate intermediate. The present PdIr/SBA-15-NH2 NCs with efficient catalytic effects on the dehydrogenation of FA may greatly promote the practical application of the FA system on fuel cells.
研究领域:
材料科学
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催化化学
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能源化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 4
·1-11
·
IF 6.232
Peng Yang,Peng Yuhang,Tang Sitian,Shen Huawei,Sheng Shangchun,Wang Yonghong,Wang Teng,Cai Juan,Xie Guoming,Feng Wenli
An integrated electrochemical immunoassay is described for the determination of circulating tumor cells (CTCs). For the first time, Ketjen black (KB), which is a superconductive carbon material, was incorporated with Au nanoparticles (AuNPs) and used to modify the surface of gold electrodes. A cocktail of anti-epithelial cell adhesion molecules (EpCAM) and anti-vimentin antibodies was chosen to capture the CTCs. Palladium-iridium-boron-phosphorus alloy-modified mesoporous nanospheres (PdIrBPMNS) served as a catalytic tag to amplify the current signal. Glycine-HCl (Gly-HCl) was used as an antibody eluent to release and collect the captured CTCs from the electrodes for further clinical research without compromising cell viability. The response of the method increased linearly from 10 to 1 × 10 6 cells mL −1 CTCs, while the detection limit was calculated to be as low as 2 cells mL −1 . This method was successfully used to determine CTCs in spiked blood samples and demonstrated good recovery.
Ketjen black/AuNPs was incorporated in the electrochemical platform to enhance the electron transfer ability of the electrode surface. PdIrBP mesoporous nanospheres were used to amplify DPV signal in this assay. The introduction of Gly-HCl realized nondestructive recovery of circulating tumor cells.
研究领域:
生物化学
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纳米技术
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电化学
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癌症研究
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Nano Energy
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2015
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IF 10.325
Tao Yang,Yanxia Ma,Qingli Huang,Guojian Cao
Exploiting nanomaterials with high electrocatalytic activity toward oxygen reduction reaction (ORR) and desirable durability in acid media has been recently one of the most significant tasks for developing electrochemical devices . Pd based nanostructures have received considerable interest owing to their Pt analogous surface and ever increasing catalytic performance. We herein report a series of Pd–Ir bimetallic nanoparticles with wire or dendritic shapes in a wide composition range, which were synthesized through a facile hydrothermal strategy. Such nanostructures featured with large electrochemical active surface area (EASA), show comparable catalytic activities to that of commercial Pt catalyst. More importantly, the catalysts display much high durability, as an example, Pd 1 Ir 2 losses 6% in EASA and 12% in mass activity after 10,000 potential sweeps, in contrast to respective losses of 42% and 58% for commercial Pt/C counterparts. The remarkable durability was also revealed in actual fuel cells supplied with hydrogen and air. The work demonstrates that these Pd–Ir nanostructures with enhanced performance are promising for practical electrocatalytic applications.
研究领域:
材料科学
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电化学
·
纳米技术
·
催化
✓ 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）