共查询到19条相似文献,搜索用时 891 毫秒
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电化学沉积制备纳米结构铜电极及其葡萄糖检测性能 总被引:1,自引:0,他引:1
利用电化学沉积法制备了高电活性的纳米结构铜电极材料, 采用扫描电子显微镜和电化学方法分别对电极表面形貌和电化学性能进行了表征, 研究了实验参数对葡萄糖电氧化活性的影响. 结果表明, 改变沉积条件可以调控沉积铜的形貌及电催化活性. 在最佳条件下制备的铜纳米结构电极对葡萄糖检测的灵敏度为1310 μA·L/mmol, 检出限为5.0×10-7 mol/L(S/N=3). 相似文献
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通过酸腐蚀去合金法处理热扩散制备的铜基表面铜锌合金得到纳米多孔铜(NPC)材料. 以NPC为载体,采用超声辅助化学镀制备Ni-B/NPC合金电极. X射线衍射(XRD)和扫描电镜(SEM)表明Ni-B/NPC电极呈现由高分散纳米颗粒组成的非晶态结构. 计时电流法(CA)结果表明化学镀5 min制备的Ni-B/NPC电极具有最大的电化学活性表面积(EASA). 循环伏安法(CV)结果表明,与块状镍电极相比,碱性介质中在Ni-B/NPC电极上葡萄糖起始氧化电位负移39 mV,氧化峰电流提高了18.9倍. 采用线性扫描伏安法(LSV)、CA和电化学阻抗谱(EIS)测定Ni-B/NPC电极对葡萄糖电催化氧化的电子转移系数(β)、电催化氧化反应速率常数(k)和葡萄糖的扩散系数(D)等动力学参数. 结果表明高分散Ni-B/NPC非晶态合金电极对碱性介质中葡萄糖的氧化具有较高的电催化活性和稳定性. 相似文献
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在5 mmol/L H2 PtCl6的稀硫酸溶液中,采用循环伏安法(CV),扫描电位为~0.2~0.6V和0.0~0.6v,分别扫描30和15循环,在碳纳米管/纳米TiO2-聚苯胺复合膜上实现了Pt纳米粒子的高度有效分散,得到多壁碳纳米管/纳米TiO2-聚苯胺载铂四组分纳米结构复合电极,通过CV法和计时电位法并结合扫描电镜对复合电极的电化学性质和结构进行表征,研究了复合电极对葡萄糖的电催化氧化性能.结果表明,该复合电极对葡萄糖的电氧化有高催化活性,具有性能稳定、重现性好、抗毒化作用强、能耐高温、易保存且使用寿命较长的优点. 相似文献
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纳米材料修饰电极在电化学分析中的应用研究进展 总被引:1,自引:0,他引:1
综述了纳米材料修饰电极在电化学分析中的应用研究.主要总结了国内外纳米金属材料、纳米金属氧化物材料、碳纳米管与碳纳米管复合物以及其他纳米材料在电化学分析中的应用研究,并指出了纳米材料修饰电极在电化学分析应用中存在的问题. 相似文献
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在碳纳米管存在下合成了直径2~10nm的钯纳米粒子,利用全氟磺酸盐聚合物Nafion溶解碳纳米管/钯纳米粒子复合物,构建了检测H2O2的电化学传感平台.循环伏安法证实所合成的钯纳米粒子在复合材料中保持了其电化学活性,该纳米复合物对H2O2具有催化能力.将葡萄糖氧化酶固定在碳纳米管/钯纳米粒子复合物修饰的玻碳电极上,制备... 相似文献
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We described the preparation of copper oxide composite nanofibers doped with carbon nanotubes (CuO/C-NFs) or nickel oxide(CuO/NiO-NFs) by electrospinning for direct glucose determination. The interest in exploring practical CuO/C-NFs and CuO/NiO-NFs electrode materials for sensor application was fascinated by the possibility of promoting electron transfer for kinetically unfavorable glucose oxidation reactions at a lower overpotential and thus improving the selectivity of the electrode for glucose in electroanalysis. The morphologies of CuO/C-NFs and CuO/NiO-NFs were characterized by scanning electron microscopy(SEM) and X-ray powder diffraction(XRD). The electrocatalytic performances of glucose were evaluated in detail by cyclic voltammetry(CV) and chronoamperometry. Facile charge transport, enhanced current response(at a lower overpotential of +0.35 V), improved stability and selectivity, as well as excellent resistance towards electrode fouling were observed at CuO/ C-NFs electrode in direct glucose electroanalysis. These merits are attributed to the highly porous three-dimensional network film structure of CuO/C-NFs electrode materials and the potential synergic catalytic effect of CuO and carbon nanotubes in composite nanofibers. This study may provide a new insight into metal oxide-based composite nanofibers obtained via electrospinning for fabricating novel and high performance sensors and devices. 相似文献
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Based on the adsorption of copper ions on single-walled carbon nanotubes(SWNTs) in electrolyte, Cu/SWNTs nanocomposite film was initially prepared on indium-doped tin oxide(ITO) substrate by one-step electrodeposition. This method may provide a versatile and facile pathway to fabricate other SWNTs-supported metal composite films. Electrochemical experiments revealed that the obtained Cu/SWNTs/ITO electrode offered an excellent electrocatalytic activity towards the oxidation of glucose and could be applied to the construction of non-enzymatic glucose biosensor. The linear range of the sensor was 1.0×10–6 to 6.0×10–4 mol/L and the response time was within 2 s. Particularly, its sensitivity reached as high as 1434.67 μA·L·mmol–1·cm–2, which was superior to any other non-enzymatic glucose biosensor based on copper-carbon nanotubes electrode reported previously. 相似文献
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This study reports a detailed analysis of an electrode material containing poly(phenolphthalein), carbon nanotubes and gold nanoparticles which shows superior catalytic effect towards to hydrazine oxidation in Britton–Robinson buffer (pH 10.0). Glassy carbon electrode was modified by electropolymerization of phenolphthalein (PP) monomer (poly(PP)/GCE) and the multiwalled carbon nanotubes (MWCNTs) was dropped on the surface. This modified surface was electrodeposited with gold nanoparticles (AuNPs/CNT/poly(PP)/GCE). The fabricated electrode was analysed the determination of hydrazine using cyclic voltammetry, linear sweep voltammetry and amperometry. The peak potential of hydrazine oxidation on bare GCE, poly(PP)/GCE, CNT/GCE, CNT/poly(PP)/GCE, and AuNPs/CNT/poly(PP)/GCE were observed at 596 mV, 342 mV, 320 mV, 313 mV, and 27 mV, respectively. A shift in the overpotential to more negative direction and an enhancement in the peak current indicated that the AuNPs/CNT/poly(PP)/GC electrode presented an efficient electrocatalytic activity toward oxidation of hydrazine. Modified electrodes were characterized with High-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). Amperometric current responses in the low hydrazine concentration range of 0.25–13 µM at the AuNPs/CNT/poly(PP)/GCE. The limit of detection (LOD) value was obtained to be 0.083 µM. A modified electrode was applied to naturel samples for hydrazine determination. 相似文献
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《Electroanalysis》2017,29(2):423-432
In the present paper, a stable and selective non‐enzymatic sensor is reported for determination of glucose (Glc) by using a carbon paste electrode modified with multiwall carbon nanotubes and Ni(II)‐SHP complex as modifier in an alkaline solution. This modified electrode showed impressive activity for oxidation of glucose in NaOH solution. Herein, Ni(II)‐SHP acts as a suitable platform for oxidation of glucose to glucolactone on the surface of the modified electrode by decreasing the overpotential and increasing in the current of analyte. Under the optimum conditions, the rate constant and electron transfer coefficient between electrode and modifier, were calculated to be 1.04 s−1 and 0.64, respectively. The anodic peak currents indicated a linear dependency with the square root of scan rate and this behavior is the characteristic of a diffusion controlled process. So, the diffusion coefficient of glucose was found to be 3.12×10−6 cm2 s−1 due to the used number of transferred electron of 1. The obtained results revealed two linear ranges (5 to 190.0 μM (R2=0.997), 210.0 to 700.0 μM (R2=0.999)) and the detection limit of 1.3 μM for glucose was calculated by using differential pulse voltammetry (DPV) method. Also, the designed sensor was used for determination of glucose in the blood serum and urine samples. Some other advantages of Ni(II)‐SHP/CNT/CPE sensor are remarkable reproducibility, stability and selectivity which can be related to using nanomaterial of carbon nanotubes due to enhancement of electrode surface area. 相似文献
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Enhanced Hydrogen Peroxide Sensing Based on Tetraruthenated Porphyrins/Nafion/Glassy Carbon‐modified Electrodes via Incorporating of Carbon Nanotubes 下载免费PDF全文
The incorporation of carbon nanotubes to a Nafion/tetraruthenated cobalt porphyrin/ glassy carbon electrode (GC/Nf/CoTRP vs GC/Nf/CNTCoTRP) enhanced the amperometric determination of hydrogen peroxide. Both electrodes produced a decrease in the overpotential required for the hydrogen peroxide oxidation in about 100 mV compared to glassy carbon under the same experimental conditions. Nevertheless, for GC/Nf/CNT/CoTRP, the increase in the current is remarkable. The GC/Nf/CoTRP modified electrode gave no significant analitycal signal for hydrogen peroxide reduction. Moreover, a great increase in current is observed with GC/Nf/CNT/CoTRP at ?150mV which suggests a significant increase in the sensitivity of the modified electrode. Scanning electrochemical microscopy (SECM) revealed an enhancement in the electroactivity of the GC/Nf/CNT/CoTRP modified electrode. This fact has been explained in terms of enhanced homogeneity of the electrodic surface as a consecuence of better dispersibility of CNT‐CoTRP produced by a Nafion polyelectrolyte. 相似文献
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Carbon nanotube (CNT)-supported Pt nanoparticle catalysts have been synthesized in supercritical carbon dioxide (scCO(2)) using platinum(II) acetylacetonate as metal precursor. The structure of the catalysts has been characterized with transmission electron micrograph (TEM) and X-ray photoelectron spectroscopy (XPS). TEM images show that the platinum particles' size is in the range of 5-10 nm. XPS analysis indicates the presence of zero-valence platinum. The Pt-CNT exhibited high catalytic activity both for methanol oxidation and oxygen reduction reaction. The higher catalytic activity has been attributed to the large surface area of carbon nanotubes and the decrease in the overpotential for methanol oxidation and oxygen reduction reaction. Cyclic voltammetric measurements at different scan rates showed that the oxygen reduction reaction at the Pt-CNT electrode is a diffusion-controlled process. Analysis of the electrode kinetics using Tafel plot suggests that Pt-CNT from scCO(2) provides a strong electrocatalytic activity for oxygen reduction reaction. For the methanol oxidation reaction, a high ratio of forward anodic peak current to reverse anodic peak current was observed at room temperature, which implies good oxidation of methanol to carbon dioxide on the Pt-CNT electrode. This work demonstrates that Pt-CNT nanocomposites synthesized in supercritical carbon dioxide are effective electrocatalysts for low-temperature fuel cells. 相似文献
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Zahran EM Prodromidis MI Bhattacharyya D Bachas LG 《Analytical and bioanalytical chemistry》2012,404(6-7):1637-1642
One-dimensional iron metallic nanotubes were prepared by electroless deposition within the pores of polycarbonate (PC) membranes. The longitudinal nucleation of the nanotubes along the pore walls was achieved by mounting the PC membrane between two halves of a U-shaped reaction tube. Palladium nanoparticles were post-deposited on the inner wall of the nanotubes. The composition, morphology, and structure of the Pd/Fe nanotubes were characterized by transmission electron microscopy, scanning electron microscopy, and inductively coupled plasma-atomic emission spectroscopy. A glassy carbon (GC) electrode modified with the free Pd/Fe bimetallic nanotubes (isolated after the dissolution of the host membranes) showed small improvement on the overpotential oxidation of ascorbic acid in comparison to the bare GC electrode. Alternatively, the Pd/Fe-polycarbonate membrane was covered with a sputtered gold thin layer of 10?nm from one side and mounted in a homemade electrochemical cell acting as the working electrode. The potential use of these functional membranes as catalytic surfaces for the electrochemical monitoring of ascorbic acid was investigated by cyclic voltammetry and amperometry. In the presence of a phosphate buffer solution, pH?7, Pd/Fe-polycarbonate membranes showed excellent electrocatalytic properties toward the oxidation of ascorbic acid even at potentials as low as 0?mV versus a Ag/AgCl reference electrode. In addition to the substantial lower overpotential, these electrodes offered selectivity over acetaminophen and uric acid, and a prolonged working stability without the need for maintenance. The electrodes were kept dry between different working days and retained their original activity for more than 1?week. Pd-polycarbonate and Fe-polycarbonate membranes were also developed for comparison purposes. 相似文献
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Yeong-Tarng Shieh Tzu-Yu Yu Tzong-Liu Wang Chien-Hsin Yang Wei-Tung Liao 《Colloid and polymer science》2012,290(1):1-9
In this study, we modified carbon nanotubes (CNTs) by grafting with poly(ethylene glycol) (PEG) using the “grafting to” method.
The PEG-grafted CNT (CNT-g-PEG) was cast on indium tin oxide (ITO) electrode to investigate the electrocatalytic activity
of CNT to the redox reactions of the Fe(CN)63−/4−as a probe using cyclic voltammetry and electrochemical impedance spectroscopy. The electrocatalytic activity of CNT was correlated
with CNT dispersion in the cast film on ITO as a function of pH of aqueous solution from which the film was cast. The CNT
dispersions in aqueous solutions of different pH and in the cast films were examined by visual observation and zeta potential,
scanning electron microscopy and transmission electron microscopy, respectively. At a pH in the range of 3–11 at which ITO
electrode was modified, two functionalized CNT (fCNT and CNT-g-PEG) were both found to electrocatalyze the redox reactions
of the Fe(CN)63−/4−probe and the PEG grafts in CNT-g-PEG could help CNT adhere to the electrode to obtain durable modified electrode. The more
uniform CNT dispersions in aqueous solutions and in the cast films appeared to have greater electrocatalytic acitivity. 相似文献