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Wei N.,Nanjing Normal University | Wei N.,Jiangsu Key Laboratory of New Power Batteries | Wei N.,Jiangsu Key Laboratory of Biofunctional Materials | Xin X.,Nanjing Normal University | And 6 more authors.
Biosensors and Bioelectronics | Year: 2011

The three-dimensionally ordered macroporous gold-nanoparticle-doped titanium dioxide (3DOM GTD) film was modified on the indium-tin oxide (ITO) electrode surface. Hemoglobin (Hb) has been successfully immobilized on the 3DOM GTD film and the fabrication process was characterized by Raman and UV-vis spectra. The results indicated that the Hb immobilized on the film retained its biological activity and the secondary structure of Hb was not destroyed. The direct electrochemistry and electrocatalysis of Hb immobilized on this film have been investigated. The Hb/3DOM GTD/ITO electrode exhibited two couples of redox peaks corresponding to the Hb intercalated in the mesopores and adsorbed on the external surface of the film with the formal potential of -0.20 and -0.48V in 0.1M PBS (pH7.0), respectively. The Hb/3DOM GTD/ITO electrode exhibits an excellent eletrocatalytic activity, a wide linear range for H2O2 from 5.0μM to 1.0mM with a limit of detection of 0.6μM, high sensitivity (144.5μAmM-1), good stability and reproducibility. Compared with the TiO2 nanoneedles modified electrode, the GTD modified electrode has higher sensitivity and response peak current. The 3DOM GTD provided a good matrix for bioactive molecules immobilization, suggesting it has the potential use in the fields of H2O2 biosensors. © 2011 Elsevier B.V.

Huang B.,Binzhou University | Huang B.,Jiangsu Key Laboratory of New Power Batteries | Zheng X.,Binzhou University | Lu M.,Binzhou University | And 4 more authors.
Journal of New Materials for Electrochemical Systems | Year: 2012

The spherical LiFePO 4/C nanoparticles are synthesized by modified carbothermal reduction method. XRD patterns show that the LiFePO 4 compound is orthorhombic crystal structure. SEM and TEM results indicate that the LiFePO 4 composite had a spherical morphology with carbon coated and the particle size is nanoscale. Charge/discharge tests and CV curves show that as-prepared sample exhibits discharge capacity of 153 mAh g -1 at 0.2 C rate with high electrode reaction reversibility. The discharge capacities of the material are 150, 132, 119, 111, 103 and 96 mAh g -1 at 1 C, 5 C, 10 C, 15 C, 20 C and 25 C rate and high voltage plateaus are achieved. The good rate performance of the composite is due to its nano particle size and spherical morphology, which reduced the diffusion path of lithium ions and electrons, increased the conductive specific surface and improved the processability of the LiFePO 4 cathode. © J. New Mat. Electrochem. Systems.

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