BIOSENSORS & BIOELECTRONICS
·
2012
·
IF 5.602
Xiangheng Niu,Chen Chen,Hongli Zhao,Yan Chai,Minbo Lan
Novel snowflake-like Pt–Pd bimetallic nanoclusters (Pt–PdBNC) were synthesized on a screen-printed gold nanofilm electrode (SPGFE) substrate by electrochemically reducing precursors with a new constant potential/multi-potential step deposition strategy. The electrocatalytic behavior of the modified electrode (SPGFE/Pt–PdBNC) towards H 2 O 2 was investigated. The results indicate that the as-prepared Pt–PdBNC significantly enhances the electrochemical reduction of H 2 O 2 in neutral media, exhibiting preferable electrocatalytic performance compared to Pt and Pd monometallic nanoclusters . Under optimum conditions, SPGFE/Pt–PdBNC offers linear responses for H 2 O 2 in the concentration range from 0.005 to 6 mM with an ultrahigh sensitivity of 804 mA M −1 cm −2 and excellent selectivity. Furthermore, glucose oxidase was immobilized on the Pt–PdBNC structure, and the fabricated biosensor presents favorable properties for glucose sensing.
研究领域:
分析化学
·
电化学
·
生物传感技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Yuxiu Li,Xiangheng Niu,Jie Tang,Minbo Lan,Hongli Zhao
Facilitating the glucose electro-oxidation reaction is always of great scientific sense due to its wide applications in sensing, catalysis and biofuel cells. On the road to improving the electrocatalysis of glucose, one-dimensional materials mainly including nanowires and nanotubes are commonly proposed because of their fascinating characters, and both of them are reported capable of offering better catalytic performance compared to commercial Pt/C and Pt black catalysts. However, so far it still confuses us that which structure can provide more favorable properties towards the direct electro-oxidation of glucose. Here we carry out a systematically comparative study of nonenzymatic electrochemical sensors based on vertical nanowire and nanotube arrays for glucose detection. By using bimetallic Pt-Pd as a general model, we demonstrate that nanotube arrays, owing to their larger catalytic area and higher catalyst utilization, show higher activity for glucose electro-oxidation and enzyme-free analysis than nanowire arrays. These findings may be helpful for the future design of more efficient catalyst structures for glucose oxidation and other reactions.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-11
·
IF 5.3
Hao Xuanxuan,Liu Zhimin,Zheng Tongtong,Fan Yunfeng,Hu Leqian
A signal-amplified platform was designed to construct a label-free electrochemical aptasensor for lead ions (Pb 2+ ) assay. First, flower-like molybdenum disulfide-supported AuNPs (AuNPs@MoS 2 ) nanocomposites were synthesized and used as substrates for modifying the electrode. The AuNPs@MoS 2 material possessed large surface area and superior biocompatibility, which was beneficial to improve the loading amount of the complementary DNA (cDNA) and amplified the response signal. Importantly, the prepared core–shell Pt@Pd bimetallic nanoparticles (Pt@PdNPs) were used to conjugate with redox marker thionine (Thi) and aptamer (Apt) for further signal amplification; the obtained signal probes (Thi-Pt@PdNPs-Apt) were connected by the cDNA assembled on the electrode through DNA hybridization. Differential pulse voltammetry was performed to monitor the signal of Thi. After incubating of aptasensor with Pb 2+ , the specific recognition of Pb 2 + and Apt resulted in the dissociation of aptamer-cDNA complex, thereby the Thi-Pt@PdNPs-Apt separated from the electrode surface and decreased current response was obtained. The prepared electrochemical sensor exhibited linear response to Pb 2+ in the range 5.0 × 10 −4 –100 nM and a detection limit of 1.0 × 10 −4 nM was achieved. The sensor was applied to the determination of Pb 2+ in actual sample with high sensitivity and accuracy, demonstrating potential applications in heavy metal monitoring. Graphical Abstract
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Rifeng Wu,Yanjie Li,Wenhao Gong,Pei Kang Shen
One-pot synthesis Pt–Pd bimetallic nanostructure has become a promising way to get superior oxygen reduction reaction performance and cost-effective electrocatalyst for proton exchange membrane fuel cells. In this work, we report a facile one-pot method by tuning the feed ratio of Pt and Pd (Pt3Pd1, Pt2Pd1, and Pt1Pd1) in ethylene glycol solution at the effect of iodide ions and poly(vinylpyrrolidone) to synthesize three different Pt–Pd bimetallic nanodendrites structure. Transmission electron microscopy and high-resolution transmission electron microscopy revealed that the nanodendrites have a Pt-rich surface structure and numerous high-index facets at the branch’s surface, thus providing a great deal of catalytic sites. Carbon-supported Pt–Pd nanodendrite catalysts were investigated for oxygen reduction reaction performance and accelerated durability test. The Pt1Pd1/C catalyst shows the best activity and durability and with a mass activity of 1.164 A mgPt–1 and a specific activity of 1.33 mA cm–2, greatly enhanced compared with commercial TKK-Pt/C catalysts (0.15 A mgPt–1 for mass activity, and 0.25 mA cm–2 for a specific activity). The Pt1Pd1/C catalyst also exhibits remarkable durability with almost negligible decay in performance after 10 000 cycles. These results provide us an attractive strategy for designing catalysts with a simple route, lower cost, and remarkable catalytic activity and durability.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Interdisciplinary Materials
·
2024
·
IF 24.5
Mingwei Wang,Zhiyi Hu,Jieheng Lv,Zhiwen Yin,Zhewei Xu,Jingfeng Liu,Shihao Feng,Xiaoqian Wang,Jiazhen He,Sicheng Luo,Dafu Zhao,Hang Li,Xuemin Luo,Qi Liu,Damin Liu,Baolian Su,Dongyuan Zhao,Yong Liu
Compositions and morphologies of Pt-based electrocatalysts have great impact on the electrocatalytic activity and stability of oxygen reduction reaction (ORR). Herein, we report a novel design of one-dimensional (1D) Pt–Pd dendritic nanotubular heterostructures (DTHs) by controlling the degree of Pt 2+ -Pt reduction reaction and Pd-Pt galvanic replacement reaction with uniform Pd nanowires as sacrificial templates. The obtained Pt–Pd bimetallic DTHs catalyst exhibited uniform and dense Pt dendritic nanobranches on the surface of 1D hollow Pt–Pd alloy nanotubes, possessing superior catalytic activity for ORR compared to state-of-the-art commercial Pt/C catalysts. Typically, the Pt 4 Pd DTHs catalyst showed efficient mass activity (MA, 1.05 A mg Pt −1 ) and specific activity (SA, 1.25 mA cm Pt −2 ) at 0.9 V (vs. RHE), and the catalyst exhibited high stability with 90.4% MA retention after 20 000 potential cycles. The Pt–Pd bimetallic DTHs configuration combines the advantages of 1D hollow nanostructures and dense Pt dendritic nanobranches, which results in rich electrochemical active surface sites, fast charge transport, and multiple dendritic anchoring points contact on carbon support, thus boosting its catalytic activity and stability towards electrocatalysis.
研究领域:
材料科学
·
电化学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Junbo Feng,Junyan Wu,Dongdong Yan,Yadong Zhang
Porous silica nano-flowers (KCC-1) immobilized Pt-Pd alloy NPs (Pt-Pd/KCC-1) with different mass ratios of Pd and Pt were successfully prepared by a facile in situ one-step reduction, using hydrazinium hydroxide as a reducing agent. The as-synthesized silica nanospheres possess radial fibers with a distance of 15nm, exhibiting a high specific surface area (443.56 m 2 ·g –1 ). Meanwhile, the obtained Pt-Pd alloy NPs are uniformly dispersed on the silica surface with a metallic particle size of 4–6 nm, which exist as metallic Pd and Pt on the surface of monodisperse KCC-1, showing the transfer of electrons from Pd to Pt. The as-synthesized 2.5%Pt-2.5%Pd/KCC-1 exhibited excellent catalytic activity and stability for the continuous dehydrogenation of 2-methoxycyclohexanol to prepare guaiacol. Compared with Pt or Pd single metal supported catalysts, the obtained 2.5%Pt-2.5%Pd/KCC-1 shows 97.2% conversion rate of 2-methoxycyclohexanol and 76.8% selectivity for guaiacol, which attributed to the significant synergistic effect of bimetallic Pt-Pd alloy NPs. Furthermore, turn over frequency value of the obtained 2.5%Pt-2.5%Pd/KCC-1 NPs achieved 4.36 s –1 , showing higher catalytic efficiency than other two monometallic catalysts. Reaction pathways of dehydro-aromatization of 2-methoxycyclohexanol over the obtained catalyst are proposed. Consequently, the obtained 2.5%Pt-2.5%Pd/KCC-1 NPs prove their potential in the dehydrogenation of 2-methoxycyclohexanol, while the kinetics and mechanistic study of the dehydrogenation reaction over the catalyst in a continuous fixed-bed reactor may provide valuable information for the development of green, outstanding and powerful synthetic pathway of guaiacol.
研究领域:
催化
·
纳米技术
·
化学工程
·
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）