Carbon Nanotube-supported Cobalt Hexacyanoferrate Nanoporous Networks by Electrodeposition with Excellent Electrocatalytic Response and High Electrochemical Activity
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KeyWord:carbon nanotubes  cobalt hexacyanoferrate  vitamin B2  nanoporous film  biosensor  electrodeposition
罗世忠,李卫娟,李乾和,焦国嵩 1.青岛科技大学化学与分子工程学院;2.青岛市环境监测中心站
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      A cobalt hexacyanoferrate(CoHCF) film was successfully electrodeposited on functionalized multi-wall carbon nanotubes(MWNTs) modified glassy carbon electrodes by scanning the potential between 0 V and 1.1 V at a scan rate of 100 mV/s for 20 consecutive scans in an aqueous electrolyte of 0.5 mol/L KCl, 1 mmol/L CoCl2 and 0.9 mmol/L K3Fe(CN)6.The modified electrodes (MWNTs-CoHCF/GCE) were characterized by scanning electron microscope and cyclic voltammetric methods.It was found that the CoHCF film was covered with the MWNTs.The MWNTs-CoHCF/GCE presented a nanoporous structure with an excellent electrochemical stability,which showed a favorable electron transfer kinetics.The cyclic voltammetric experiment showed that the MWNTs-CoHCF/GCE had a favorable electrochemical activity for the oxidation of vitamin B2 (VB2),and the peak current was linear over VB2 concentration in the range of 1.2×10-7-2.6×10-7 mol/L with a detection limit(S/N=3) of 8.9×10-8 mol/L.