Electrocatalytic Oxidation of Calcium Folinate on Carboxyl Graphene Modified CuxO/Cu Electrode |
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| Authors: | Li-wen Wang Shou-guo Wu Tian-yang Shi Wei Wei Pan Pan |
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| Affiliation: | Department of Chemistry, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Carboxyl graphene modified CuxO/Cu electrode was fabricated. The bare copper electrode was firstly anodic polarized in 1.0 mol/L NaOH solution in order to get CuxO nanoparticles, then the carboxyl graphene (CG) was electrodeposited on the CuxO/Cu electrode by cyclic potential sweeping. The electrocatalytic oxidation behaviors of calcium folinate (CF) at the graphene modified CuxO/Cu electrode were investigated by cyclic voltammetry. A positive scan polarization reverse catalytic voltammetry was used to obtain the pure catalytic oxidation current. The graphene modified CuxO/Cu electrode was served as the electrochemical sensor of CF, a highly sensitivity of 22.0 μA·(μmol/μL)-1cm-2 was achieved, and the current response was linear with increasing CF concentration in the range of 2.0×10-7 mol/L to 2.0×10-5 mol/L, which crossed three orders of magnitude, and the detection limit was found 7.6×10-8 mol/L (S/N=3). In addition, the proposed sensor was successfully applied in determination of CF in drug sample. |
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| Keywords: | Calcium folinate Carboxyl graphene CuxO/Cu electrode Chemically modified electrode Positive scan polarization reverse catalytic voltammetry |
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