INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Weicong Li,Narayanamoorthy Bhuvanendran,Huiyuan Liu,Weiqi Zhang,Khadijeh Hooshyari,Sae Youn Lee,Qian Xu,Huaneng Su
Platinum-group-metal-based polyhedral nanostructures generally possess high catalytic activity for electrochemical reactions owing to their numerous edges, corners, and well-defined lattice planes . However, their direct synthesis on common carbon powder is difficult, which considerably hinders their applications in practical devices. Herein, we report PtPd nanocubes (NCs) grown in situ on commercial carbon powder (Vulcan XC-72R) using a facile one-pot method. The as-prepared PtPd NCs/C (∼20 wt% metal) possess Pt-enriched surfaces, enabling the mass activity (MA) of methanol oxidation reaction (MOR) up to 1.77 A mgPt −1 , which is 3.34/3.69 times that of commercial PtRu/C and Pt/C, respectively. With an average size of 8–10 nm, the PtPd NCs/C exhibit high stability, retaining over 80% initial MA against MOR in an accelerated durability test. For practical direct-methanol fuel cell (DMFC) operation, the PtPd NC/C as an anode catalyst delivered a maximum power density of 0.232 W cm −2 with high-concentration methanol (10 M) flow, which is 1.6 times higher than that for commercial PtRu/C under the same conditions. Moreover, the PtPd NCs/C demonstrated excellent durability for DMFC operation with much lower voltage decay than commercial PtRu/C, indicating its excellent potential for practical DMFC applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Juan Luo,Qing Li,Feng Liu,Jingjing Huang,Hao Cui,Yuke Gu,Meihuan Liu,Pengfei Tan,Jun Pan
Overcoming kinetic limitations in the acidic oxygen reduction reaction (ORR) demands Pt-based catalysts with optimized surface adsorption. Herein, we engineer hierarchical PtPd dendrite nanocrystals (PtPd NDs) featuring precisely tailored asymmetric sites and high-index facets (HIFs) to overcome the kinetic limitations in acidic media. Controlled Pd incorporation disrupts symmetry of the single-oriented crystal plane, generating inhomogeneous strain and promoting HIFs exposure. This synergistic structural engineering optimizes the adsorption/desorption of oxygen-containing intermediates, significantly accelerating ORR kinetics. Consequently, PtPd NDs deliver exceptional mass activity (MA = 1.37 A mg Pt −1 , 11.42 times higher than Pt/C) and remarkable stability (83.9% MA retention after durability testing). In H 2 -Air fuel cells, PtPd NDs also achieve higher peak power density versus Pt/C cathodes. In situ synchrotron radiation infrared spectroscopy and theoretical studies reveal that the synergistic effect between asymmetric sites and HIFs stimulates the strain field and causes a downward shift in the d -band center, thereby lowering the *OOH formation barrier and weakening intermediate adsorption, directly boosting the ORR performance. This work underscores the critical role of facet and site engineering in designing high-performance fuel cell electrocatalysts.
研究领域:
电化学
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催化
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材料科学
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纳米技术
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能量转换
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Tao Lu,Tengfei Yu,Yaqi Yan,Huan Li,Zhiguang Suo,Qian Li,Min Wei,Huali Jin
Aflatoxin B1 is one of the most toxic carcinogens and has been classified as a group I carcinogen by the International Agency for Research on Cancer. AFB1 is widely distributed in the natural environment and may be present in various grains and products. Therefore, it is significant to establish a strategy for in site detection of AFB1 accurately. Herein, a portable electrochemical aptasensor was developed for accurate detection of AFB1. A screen-printed electrode was selected as the working electrode, which improves the portability and practical application of the aptasensor. The use of gold-nanoparticles/FeCo-MOFs as electrode modification materials improves both the electron transfer efficiency and the large number of connected signal probes. Daisy-like bimetallic PtPd nanoflowers have rich specific surface area, providing numerous sites for loading of the signal molecule thionine. Additionally, the catalytic hairpin assembly cycle amplification strategy was implemented to effectively enhance the sensitivity of the aptasensor. Under optimal conditions, the sensor exhibited a detection range of 0.001–500 ng/mL and a limit of detection of 0.818 pg/mL. The developed aptasensor exhibited positive analytical performance in real samples, quality control samples and toxin samples produced by aspergillus flavus. This work advances the development of portable, sensitive and in site analytical methods, with promising applications in food safety field testing.
研究领域:
分析化学
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食品安全
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生物传感器
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纳米材料
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环境监测
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毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Suphitsara Maturost,Nathapong Pongpichayakul,Paralee Waenkaew,Napapha Promsawan,Suwaphid Themsirimongkon,Jaroon Jakmunee,Surin Saipanya
This paper proposes an approach for the fabrication of an anode electrocatalyst for application as a fuel cell catalyst. It comprises three components, multiwall carbon nanotube (CNT), ceria oxide (CeO 2 ), and metal (i.e., Pt and/or Pd), using the reduction method for preparation. The characterization of the prepared catalysts was determined by transmission electron microscopy (TEM), X-ray diffraction, and Raman spectroscopy. The electrocatalytic performance of the prepared catalysts was examined by electrochemical measurements, e.g., cyclic voltammetry, chronoamperometry and CO stripping voltammetry. Among the catalysts, the obtained 1Pt1Pd − CeO 2 /CNT electrocatalyst provides a high electrochemical surface area, as well as high oxidation activity and durability for the oxidation of methanol, ethanol, and formic acid. The enhancement of the catalytic activity is attributed to changes in the surface electronic structures of Pt, Pd, and CeO 2 on the CNT surface that incrementally effect the active sites for oxidation. A required catalytic performance for these oxidations were observed with small-size and high-dispersion of the metal i.e.1Pt1Pd (3.34 nm) on the CeO 2 /CNT support nanocomposite. The results also show substantial improvement in the kinetics for oxidations and mass transfer efficiency owing to the catalyst structure. Therefore, the prepared catalysts have promising potential for application in low-temperature fuel cells.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 71
·57640-57646
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IF 3.84
Baohua Zhang,Xiuqin Zhan,Pengyu Zhao,Zhonghao Li
Ionic liquids provide chemists with a versatile platform and many opportunities for constructing various interesting inorganic materials. Here, an ionic liquid-mediated synthesis route is proposed for the controlled synthesis of PtPd bimetallic particles. The synthesized PtPd particles have unique three dimensional nanostructures (3D) constructed by nanoparticle subunits. For the 3D nanostructures, the primary PtPd particles form aggregates with the characteristic of interparticle porosity. Among others, the Pt1Pd1 bimetallic particles exhibit superior electrocatalytic activity toward oxidation of methanol in an alkaline medium than the commercial state-of-the-art Johnson-Matthey platinum black catalyst (Hispec™ 1000). Furthermore, the catalytic activity towards p-nitrophenol reduction indicates that the synthesized Pt1Pd3 particles exhibit the highest catalytic activity in comparison with the studied various PtPd bimetallic particles, the monometallic Pt and the monometallic Pd particles. This study may pave the way for the efficient synthesis of three dimensional bimetallic nanostructures for improved catalytic applications.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 24
·3901-3905
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IF 4.446
Wen-Tao Kuang,Ze-Li Jiang,Hui Li,Jing-Xuan Zhang,Lin-Nan Zhou,Yong-Jun Li
Graphical Bond breaking and bond making : Au/Pd 63 Pt 37 nanowires are prepared in a one-pot, two-step synthesis. The tri-metallic nanowires are an excellent bi-functional catalyst, capable of electrochemically catalyzing ethanol oxidation (C−C bond breaking) to output electric energy and chemically catalyzing Suzuki coupling (C−C bond formation) to produce new materials. Tri-metallic nanowire catalysts combine the synergistic effect of multiple metals with the geometrical effect of nanowires, exhibiting better catalytic performance than composition-equivalent nanospherical catalysts. However, tri-metallic nanowires are not easily produced directly because of the participation of multiple precursors and the difficulty of selecting capping agents. Herein, we develop a one-pot, two-step synthetic strategy, producing tri-metallic Au/PdPt core/shell nanowires. Moreover, the PdPt shell is an alloy composed of nanoparticles, and its Pd : Pt atomic ratio is easily adjusted by controlling reaction time. The formation of Au/PdPt nanowires is attributed to the initial formation of Au/Pd core/shell nanowire and subsequent galvanic replacement between Pd shell and PtCl 6 2− . As-prepared Au/PdPt nanowires show composition- and structure-dependent catalytic activity and durability for the electrooxidation of methanol and ethanol, and the Suzuki coupling reaction. Optimized Au/Pd 63 Pt 37 nanowire, due to its proper Pd : Pt atomic ratio and porosity of the PdPt shell, exhibits excellent catalytic activity and durability towards methanol and ethanol electrooxidation, ∼18 and 11 times in the specific activity better than that of commercial state-of-the-art Pt/C catalyst, respectively. Moreover, Au/Pd 63 Pt 37 nanowire shows the superior catalytic performance in Suzuki coupling reaction, ∼96 % at yield, far better than commercial state-of-the-art Pd/C catalyst.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 1
·195-206
·
IF 2.646
Li Zhenqin,Deng Xiaoting,Zhou Haikun,Xuan Wei,Xie Zhiyong,Liu Feng
There are many types of cathodic oxygen reduction catalysts for proton exchange membrane fuel cell (PEMFC). Among them, Pt-based catalysts are most likely to be industrialized because of their incomparable high activity. However, most of the Pt-based catalysts have not reached the maximum activity and stability. Herein, porous carbon nanofibers (p-CNF) with self-nitrogen-doped as catalyst supports were successfully prepared by the method of electrospinning. After functionalization, the functionalized porous carbon nanofibers (f-p-CNF) were loaded with PtPd alloy nanoparticles to obtain the catalyst (Pt 0.66 Pd 0.33 /f-p-CNF), which has excellent electrochemical performance. Its specific activities (SA) and Pt mass activities (Pt MA) are 1.73 and 1.86 times of the commercial JM 20% Pt/C (JM20), respectively. The results can be attributed to the porous structure of nanofibers, which not only facilitate the transmission of gas-liquid and electron but also increase the exposure of active sites. And the doped nitrogen of fibers may regulate the electronic structure of the metal active substance to increase the activity. This work provides catalyst with novel structure which could enable PEMFCs to be more efficient in operation.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 7
·075022
·
IF 1.068
Yuanxu Sun,Xiaoqing Zhu,Dandan Guo,Xiao Chen,Jingtao Dai
Platinum and palladium bimetal nanoparticles on ferroferric oxide (PtPd/Fe3O4 NPs) nanocomposite catalysts were successfully synthesized with polyvinyl pyrrolidone as a stabilizing agent. The resultant samples were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy, high-resolution transmission electron microscopy, inductively coupled plasma, and magnetic studies. The catalytic performance of the PtPd/Fe3O4 NPs in the Heck and Suzuki coupling reactions was evaluated. Results showed that the cubic phase of Pt and Pd bimetal nanoparticles coexists with that of Fe3O4. The PtPd/Fe3O4 NP catalysts, which were approximately 22 nm in size, showed excellent catalytic activity in the Heck and Suzuki reactions. Moreover, the catalyst can be recovered with a magnet and reused several times without the significant loss of catalytic activity.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Lingling Li,Yingliang Feng,An Pei,Lihua Zhu,Weizhen Wang,Guang Li,Chengxiu Huang,Zhiqing Yang,Hengqiang Ye
Different atomic ratios of PtPd alloy nanoparticles (NPs) supported on carbon doping with nitrogen-NC (Pt x Pd y /NC) are successfully prepared to simultaneously enhance hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR), in which Pt 5 Pd 5 /NC with an atomic ratio of 5:5 has the best performance. Pt 5 Pd 5 /NC exhibits a significantly reduced HER overpotential (12 mV@10 mA cm −2 ) and the mass activity (MA) for MOR is up to 6.85 A mg −1 PtPd , 11.61 and 34.25 times higher than that of commercial Pt/C (Pt/C-JM) and commercial Pd/C (Pd/C-JM), respectively. Remarkably, coupling boosted HER on the cathode with accelerated MOR on the anode, efficient H 2 generation is achieved. This two-electrode flow cell only requires a cell voltage of 1.100 V at 100 mA cm −2 and can be stably operated for >300 h at 1.960 V with impressive long-life stability. Such performance even outperforms that of (IrO 2 ) OER‖HER (Pt/C-JM) cell. Electrochemical in-situ Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis show that electronic effect is formed between N and PtPd and can oxidize the intermediate HCOO - at a lower potential (0.300 V), promote the desorption of the toxic intermediates and improve the catalytic property.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Shenguang Ge,Yan Zhang,Lina Zhang,Linlin Liang,Haiyun Liu,Mei Yan,Jiadong Huang,Jinghua Yu
A trimetallic dendritic Au@PdPt nanparticles (Au@PdPt NPs) with intrinsic peroxidase-like catalytic activity were fabricated by a facile method. Au@PdPt NPs catalyzed the reduction of H 2 O 2 with the help of the electron mediator (thionine), which produced the electrochemical signals dramatically amplified. A sandwiched sensor was designed and implemented in the paper chip device for the determination of K-562 cells. The surface of dendritic Au@PtPd NPs was linked with folic acid by click chemistry. Folic acid was attached to the folate receptor (FR) of cell surface with high affinity. So, K-562 cells could be assayed based on folic acid-functionalized Au@PtPd NPs. On the other hand, folic acid-functionalized Au-paper working electrode on origami electrochemical device was fabricated, which could be used to capture K-562 cells. The twice utilization of folic acid for the capture of K-562 cells as well as the attachment of dendritic Au@PtPd NPs nanoprobe, which enhanced the selectivity of sensor for the determination of cells. The proposed biosensor exhibited excellent analytical performance toward the cytosensing of K562 cells with a wide detection linear range from 1.0 × 10 2 to 2.0 × 10 7 cells mL −1 and a detection limit of 31 cells mL −1 . Further, the proposed electrochemical sensor was applied to monitor cells. Au@PtPd NPs nonenzymatic catalysts could be used as signal-amplifying nanoprobes for ultrasensitive electrochemical sensing.
研究领域:
生物医学工程
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分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Weiyan Liu,Hongmei Yang,Shenguang Ge,Lei Shen,Jinghua Yu,Mei Yan,Jiadong Huang
In this paper, PtPd alloy decorated reduced graphene oxide (RGO/PtPd) was synthesized by a simple and green method. The RGO/PtPd could catalytic oxidation of H 2 O 2 to form O 2 and O 2 acted as the coreactant of peroxydisulfate, could greatly amplify the ECL signal. Moreover, the RGO/PtPd exhibited higher catalytic activity compared to the RGO/Pt or RGO/Pd catalyst because of the synergetic effects of Pt and Pd and the enhanced electron transfer of RGO. Based on this, a highly sensitive and selective label-free electrochemiluminescence (ECL) aptasensor for detection of adenosine triphosphate was designed. In this process, RGO/PtPd could be regarded as mimicking enzyme, the effect of which was similar to horseradish peroxidase in generating O 2 and also used as carriers to immobilize ssDNA2. With respect to sensitivity, Ag dendrites with hierarchical nanostructures were electrodeposited on working electrode of portable indium tin oxide device, which improved the electronic transfer rate as well as increased the amount of immobilized capture ssDNA1. Under the optimal conditions, the approach provided a linear range from 0.1 pM to 50 nM and a low detection limit of 0.037 pM.
研究领域:
分析化学
·
生物传感
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2016
·Vol. 10
·期 3
·1064-1077
·
IF 8.893
Qiu Pengtao,Lian Shaomin,Yang Guang,Yang Shengchun
We demonstrate a facile hydrothermal one-pot synthesis method for producing single crystalline mesoporous PtPd bimetallic nanoparticles with a hollow interior and porous surface structure in the presence of Br – and I – ions. The formation process analysis indicated that the coexistence of Br – and I – ions is responsible for the formation of the novel bimetallic nanoparticles. The changes in the reduction potential of Pt and Pd metal ions achieved by the coordination with different halide ions resulted in the formation of hollow interiors as a galvanic reaction between Pd 2+ and Pt 4+ ions occurred. In addition, the size of the mesoporous PtPd nanoparticles can be well controlled by slightly changing the amount of I – ions used. The electrochemical tests indicated that the assynthesized single crystalline mesoporous PtPd hollow nanoparticles exhibited enhanced catalytic properties toward methanol and ethanol oxidation reactions as compared with the commercial Pt black and Pt/C materials.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）