MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
·
IF 4.2
Yanhu Li,Mei Chen,Linghong Xue,Xu Li,Qingji Wang
Metal oxide semiconductor (MOS) sensor, one of the most widely used gas sensors, faces significant challenges in achieving lower detection limit. Addressing this issue, the utilization and strategic design of bimetallic catalysts present a promising avenue. In this paper, Pd-Pt was in-situ grown on ZnO nanoflowers directly prepared on planar substrate and a sensor for detecting acetone was developed. The test results reveal that the Pd-Pt/ZnO nanoflowers sensor exhibits a remarkable 107.6 response to 100 ppm acetone at 350 °C, while presenting a rapid response (15s). Moreover, this sensor demonstrates excellent capability in detecting acetone at concentrations as low as 1 ppb, showcasing impressive gas-sensing performance. The response of the sensor to 100 ppm acetone is twice that of ethanol at the same concentration. The exceptional performance of the sensor results from its distinctive nanoflower structure and the catalytic effect of the Pd-Pt, which offers an extensive surface area and enhances the rate of redox reaction for gas molecules. This in-situ grown method has great potential for improving the gas-sensing performance in gas sensor.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6550-6559
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IF 3.591
Xiuqi Dong,Shixiang Lu,Wenguo Xu,Shuguang Li
A composite of bimetallic micro/nanostructured palladium–platinum (Pd–Pt) alloy, reduced graphene oxide (rGO) and polydopamine (PDA) on three-dimensional nickel foam (NF) was obtained by chemical immersion method and anneal method for ethanol electrocatalysis. The key points of the synthesis method are employing PDA as an adsorbent of graphene oxide (GO), rGO with a high specific surface area as the carbon carrier of the Pd–Pt alloy after annealing, and NF as the secondary substrate. Scanning electron microscopy revealed that Pd–Pt particles with dendrite-like micro/nanostructure are well dispersed on the surface of rGO, which provide a great deal of catalytic sites. The structure and phase characterization were determined by X-ray diffraction. The diffraction peaks of bimetallic catalysts are shifted in comparison with those of two monometallic catalysts, which prove the formation of the Pd–Pt alloy. The lattice strain and electronic effect of Pd–Pt alloy micro/nanostructured particles lead to the improvement of the electrocatalytic properties of materials. In the electrochemical measurement, the composite of the Pd–Pt alloy with appropriate atomic ratio, rGO, PDA and NF (Pd6Pt@GPN) provided the largest electrochemically active surface area and the highest peak current density with significantly enhanced cycling stability in the forward scan toward EOR in alkaline medium among all catalysts prepared. Thus, this Pd6Pt@GPN catalyst highlights the potential application in the anode catalyst of a direct ethanol fuel cell.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
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IF 5.455
Dan Yu,Yufei Feng,Jing Jin,Qian Liu,Lu Tao,Junshuang Zhou,Li Hou,Faming Gao
A bstract One-dimensional (1D) Pt-based nanotubes (NTs) are widely studied as a promising class of ORR electrocatalysts . A rational porosity for wall of nanotubes could lead to higher atomic utilization and better mass transportation. To confirm this speculation, we prepare a novel class of PdPt porous nanotubes with sub-nano Pt-shell. Their ESCA of 95 m 2 g −1 and mass activity of 2.29 A mg Pt −1 are distinctly greater than that of the Pt nanotubes with perfect wall (91.45 m 2 g −1 and 2.09 A mg Pt −1 ), and are 14.3 and 9.6 times higher than those of commercial benchmark Pt/C catalyst, respectively. The prolonged electrocatalytic durability is also shown. The improved performance can be ascribed to a combination of alloying and unique geometry (one dimension and nanotubes with porous walls).
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Chenyi Yuan,Junhao Ma,Xiaowei Cheng,Jinsheng Cheng,Hongxiu Yu,Hualong Xu,Yonghui Deng
Methane (CH 4 ) serves as a commonly utilized fuel gas in various industrial and everyday settings. Given its flammable, explosive, and greenhouse gas nature, the real-time monitoring of its concentration in the air holds vital importance across practical applications. The tetrahedral structure of methane molecules features high bond energies, posing a significant challenge for chemical detection over metal oxide-sensitive layers. In this research, a multicomponent assembly method is used to synthesize ordered mesoporous tin oxide (SnO 2 ) with uniform large mesopores (≈ 10 nm) and pore wall functionalized with Pd x Pt nanoalloys (≈ 2.5 nm), and due to the unusual C–H bond activation capabilities of Pd x Pt nanoalloys and semiconducting properties of mesoporous SnO 2 , the obtained Pd 2 Pt@m-SnO 2 is used to fabricate gas sensors which showcases a wide applicability range in detecting concentrations ranging from 50 to 20 000 ppm at 400 °C, and it yields a substantial CH 4 response of 9.19 (1000 ppm) and an ultralow limit of the detection value of 175.9 ppb. Furthermore, the sensor is successfully incorporated into a portable device, evidencing its capability for accurate CH 4 detection in real-world scenarios.
研究领域:
材料科学
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化学传感器
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 25
·3655-3661
·
IF 3.1
Ningkang Qian,Degong Ding,Liang Ji,Junjie Li,Hui Zhang,Deren Yang
Lattice engineering is a powerful strategy not only to optimize electrocatalytic performances, but also to deepen the understanding of electrocatalytic mechanisms. Lattice engineering can be effectively achieved in core–shell nanocrystals owing to the lattice mismatch of heterostructures. Herein, we constructed three kinds of icosahedra consisting of Au73Pd27@Pt, Au66Pd34@Pt and Pd@Pt core–(interlayer)–shell by a seed-mediated method. The introduction of an ultrathin Pd interlayer in the Au66Pd34@Pt icosahedra enables us to separately identify the strain effect and ligand effect. The specific activities towards the EOR of these icosahedra are in the sequence Au73Pd27@Pt > Au66Pd34@Pt > Pd@Pt, indicating that both the ligand effect and strain effect caused by Au can enhance the activity of Pt towards the EOR. The in situ FTIR studies confirm that the EOR processes on these icosahedra are all dominated by the C2 pathway, and hence we ascribe the enhancements of EOR activities to the faster kinetics of the C2 pathway by producing acetate or acetaldehyde.
研究领域:
材料科学
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电催化
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Liying Zong,Xiaoqiao Yang,Xiaohuan Sun,Zheng Xi,Jie Han
Understanding the crystal facet effect in chiral enantiomer recognition plays an important role in designing and fabricating chiral nanozymes for biosensing and biodetection applications. Herein, we design an ideal platform to study the crystal facet effect in chiral enantiomer recognition using cubic and icosahedral PdPt3 hollow nanocages (NCs) as peroxidase mimics via surface ligand decoration of l/d-cysteine (l/d-Cys). The two PdPt3 NCs have the same structure of surface ligand, particle size, wall thickness, surface area, and elemental composition, with the only difference of exposed crystal facets, i.e., {100} for cubic PdPt3 NC-l/d-Cys and {111} for icosahedral PdPt3 NC-l/d-Cys. The cubic PdPt3 {100} facet demonstrates 2.2-fold higher peroxidase-like catalytic activity than the icosahedral PdPt3 {111} facet, which also leads to the better enantiomer recognition performance of discerning 3,4-dihydroxy-l/d-phenylalanine. Our work provides the concept of crystal facet tuning for designing chiral nanozymes with high stereoselective properties.
研究领域:
生物传感
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Tareque Odoom-Wubah,Zhenzhen Li,Zhou Lin,Tingting Tang,Daohua Sun,Jiale Huang,Qingbiao Li
Bimetallic Pd-Pt nanoflowers (Pd-Pt NFs) of varying sizes (20–60 nm) were synthesized through the concurrent reduction of Pd(NO 3 ) 2 and K 2 PtCl 4 using Cinnamomum camphora ( C. camphora ) leaf extract assisted by ascorbic acid (AA). C.Camphora acted as both a co-reducing agent and a green template in the synthesis protocol providing a fast, simple, green and cost-effective means of producing the Pd-Pt NFs. Characterization techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used to confirm the Pd-Pt NFs formation. FT-IR analysis showed that biomolecules such as polyphenols and flavonoids were responsible for the reduction while stretching vibration bands from C H, C C , O H, and C O O acted as capping agents. The as-formed Pd-Pt NFs showed excellent performance and stability in the electro-oxidation of ethanol in alkaline media. Electro-catalytic performance increased with Pt content, while addition of Pd increased stability. The PdPt 3 NFs presented the best performance with a mass activity of 1.43 A mg −1 metal , 5.72, 4.93, 2.27, 1.27, 11 and 4.6% higher than the Pd, Pt, Pd 3 Pt, and PdPt NFs, and commercial Pt and Pd-black respectively. However, it was more prone to poisoning, with an I f /I r value of 0.78 compared to 1.37 for Pd 3 Pt NFs.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2025
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IF 6
Ying Ding,Jing Yuan,Nana Jin,Fengzhen Yang,Fan Jiang,Lei Wang,Yanbin Li,Jianhan Lin
Background Immunomagnetic separation is essential for screening pathogenic bacteria to prevent food poisoning. However, free immunomagnetic nanobeads (IMNBs) coexist with IMNB-bacteria conjugates (IBCs) after traditional immunomagnetic separation resulting in the infeasibility for IMNBs on IBCs to further act as signal label in bacterial detection. Although we have demonstrated that magnetophoretic separation at a high flowrate could separate IBCs from IMNBs, partial IMNBs were still found with IBCs due to chaotic flows and resulted in inevitable interferences. Thus, this study developed a new magnetophoretic separation strategy at a low flowrate under a static ring magnetic field for separating IBCs from IMNBs more thoroughly. Results This new magnetophoretic separation strategy was verified for precise sorting of the commercial MNBs with the original wide range of 110-330 nm to obtain the uniform MNBs with a narrow range of 143-193 nm. The decoration of Pd and Pt nanoparticles onto the MNBs was demonstrated with no impact on their capture of target bacteria because they could capture over 90% target bacteria. Under the optimal conditions, this immunosensor could quantitatively detect Salmonella from 3.4 × 10 1 to 3.4 × 10 5 CFU/mL in 40 min with a detection limit of 34 CFU/mL. Besides, this immunosensor had shown a good specificity to Salmonella and a good practicability for detection of Salmonella in the chicken samples. Significance This immunosensor only needed one kind of antibody, making it much easier to be extended for other bacterial detection, and only required one-step immunoreaction, making the detection time much shorter, and employed magnetic nanobeads decorated with platinum and palladium nanoparticles, making the detection sensitivity much higher.
研究领域:
食品安全
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生物传感
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2013
·Vol. 19
·期 41
·13720-13725
·
IF 5.831
Zhongyuan Huang,Haihui Zhou,Feifei Sun,Chaopeng Fu,Fanyan Zeng,Tianqi Li,Yafei Kuang
Graphical Totally tubular : PdPt bimetallic nanotubes with diameters of 10–20 nm and lengths of several micrometers were facilely prepared by self-assembly at room temperature (see figure). The as-prepared PdPt nanotube catalysts have not only high activity but also good stability for ethanol oxidation in alkaline medium. PdPt bimetallic nanotubes were prepared by the self-assembly of Pt and Pd on Te nanowires at room temperature. The morphologies of the as-prepared PdPt nanotubes were investigated by scanning electron microscopy and transmission electron microscopy, and the results display a large amount of PdPt bimetallic nanotubes with a diameter of 10–20 nm and a length of several micrometers. The composition and structure of the nanotubes were characterized by X-ray diffraction, high-resolution transmission electron microscopy, scanning transmission electron microscopy, and energy spectrum analysis, and the results display uniform compositional distributions of both elements (Pd and Pt). The mechanism of the formation of the nanotube structure was supposed. The electrocatalytic performance of PdPt nanotubes were studied by cyclic voltammetry and chronoamperometry. Electrochemical results show that the as-prepared PdPt nanotube catalysts have not only high activity but also good stability for ethanol oxidation in alkaline medium.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 20
·1800783
·
IF 4.834
Fengting Cao,Tao Liu,Wenyan Si,Xichao Li,Shimei Sun,Xiaolin Sun,Quanhai Niu,Takeo Ohsaka,Jianfei Wu
Pt and Pt-based alloys are still the mainstream electrocatalysts for oxygen reduction reaction (ORR) so far, which is an important process for fuel cell. Herein, for the first time ternary icosahedral nanocrystals supported on carbon PdPtNi/C are constructed by a facile one-pot approach and are characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrocatalytic performance of the as-prepared catalyst for ORR is evaluated in acid electrolyte and compared with the state-of-the-art commercial Pt/C catalyst at identical condition. The icosahedral structure with 20 exposed {111} facets and twin boundaries are the distinguishing features of the PdPtNi/C nanoparticles, which enable them to be more active. The compressive strain effect and electronic interaction (ligand effect) of Pd, Pt, and Ni elements are also responsible for the excellent performance of the catalyst: the higher onset potential of ORR than that of commercial Pt/C, the outstanding specific activity and mass activity, which is about 9.59 and 5.40 times higher than those of commercial Pt/C at 0.90 V RHE , respectively, while 5.39 and 4.75 times higher at 0.85 V RHE , respectively. These results can promote the practical application of Pt-based catalyst and thus accelerate the widespread commercialization of fuel cell technologies.
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
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2013
·
IF 3.554
Jun Yan,Shi Liu,Zhenqin Zhang,Guangwu He,Ping Zhou,Haiying Liang,Lulu Tian,Xuemin Zhou,Huijun Jiang
Pd–Pt bimetallic nanoparticles anchored on functionalized reduced graphene oxide (RGO) nanomaterials were synthesized via a one-step in situ reduction process, in which Pt and Pd ions were first attached to poly(diallyldimethylammonium chloride) (PDDA) functionalized graphene oxide (GO) sheets, and then the encased metal ions and GO were subjected to simultaneous reduction by ethylene glycol. The as-prepared Pd 3 Pt 1 /PDDA-RGO nanocomposites were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and electrochemical methods. In addition, an electrochemical sensor based on the graphene nanocomposites was fabricated for the simultaneous detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA) in their ternary mixture. Three well-separated voltammetric peaks along with remarkable increasing electro-oxidation currents were obtained in differential pulse voltammetry (DPV) measurements. Under the optimized conditions, there were linear relationships between the peak currents and the concentrations in the range of 40–1200 μM for AA, 4–200 μM for DA and 4–400 μM for UA, with the limit of detection (LOD) (based on S/N = 3) of 0.61, 0.04 and 0.10 μM for AA, DA and UA, respectively. This improved electrochemical performance can be attributed to the synergistic effect of metallic nanoparticles and RGO and the combination of the bimetallic nanoparticles. Furthermore, the practical electroanalytical utility of the sensor was demonstrated by the determination of AA, DA and together with UA in human urine and blood serum samples with satisfactory results.
研究领域:
材料科学
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分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Carbon Energy
·
2023
·Vol. 5
·期 12
·e367
·
IF 20.5
Xi-Lai Liu,Yu-Chuan Jiang,Jiang-Tao Huang,Wei Zhong,Bin He,Pu-Jun Jin,Yu Chen
Small-molecule electrooxidation-boosted water electrolysis (WE) is an energy-saving method for hydrogen (H 2 ) production. Herein, PdPt bimetallenes (PdPt BMLs) are obtained through the simple galvanic replacement reaction. PdPt BMLs reveal 2.93-fold enhancement in intrinsic electroactivity and 4.53-fold enhancement in mass electroactivity for the formate oxidation reaction (FOR) with respect to Pd metallenes (Pd MLs) at 0.50 V potential due to the synergistic effect. Meanwhile, the introduction of Pt atoms also considerably increases the electroactivity of PdPt BMLs for hydrogen evolution reaction (HER) with respect to Pd MLs in an alkaline medium, which even exceeds that with the use of commercial Pt nanocrystals. Inspired by the outstanding FOR and HER electroactivity of bifunctional PdPt BMLs, a two-electrode FOR-boosted WE system (FOR-WE) is constructed by using PdPt BMLs as the cathode and the anode. The FOR-WE system only requires an operational voltage of 0.31 V to achieve H 2 production, which is 1.48 V lower than that (ca. 1.79 V) with the use of the traditional WE system.
研究领域:
材料科学
·
电化学
✓ 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）