• 文献标题:   Application of Ionic Liquid-Graphene-NiO Hollowsphere Composite Modified Electrode for Electrochemical Investigation on Hemoglobin and Electrocatalysis to Trichloroacetic Acid
  • 文献类型:   Article
  • 作  者:   ZHAO WS, LI XY, WEN ZR, NIU XL, SHEN QF, SUN ZL, DONG RX, SUN W
  • 作者关键词:   nio hollowsphere, direct electrochemistry, hemoglobin, carbon ionic liquid electrode, trichloroacetic acid
  • 出版物名称:   INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
  • ISSN:   1452-3981
  • 通讯作者地址:   Hainan Normal Univ
  • 被引频次:   6
  • DOI:   10.20964/2017.05.06
  • 出版年:   2017

▎ 摘  要

In this present paper NiO hollowsphere was synthesized by a solvothermal method. Then it characterized by different methods including powder X-ray diffraction and scanning electron microscopy. NiO hollowsphere was further mixed with hemoglobin (Hb), ionic liquid and graphene (GR) to get a biocomposite, which was casted on carbon ionic liquid electrode. Spectroscopic data showed that Hb kept its native structure in the mixture. Direct electron transfer of Hb were investigated with a pair of well-defined quasi-reversible redox peaks appeared and the formal peak potential (E-0') was got at -0.341 V (vs. SCE). The Hb modified electrode showed excellent electrocatalysis to trichloroacetic acid (TCA) reduction. Under the selected conditions the currents had a good linear relationship with TCA concentration from 1.5 to 10.0 mmol L-1 and the detection limit was 0.5 mmol L-1 (3 sigma). This Hb based electrode exhibited good stability and reproducibility, which could be used for third-generation electrochemical biosensor.