Abstract
The new electrocatalyst, ZnCr2O4/MWCNTs composite was successfully synthesized by hydrothermal method followed by calcination at 500°C. A potential application of ZnCr2O4/MWCNTs composite modified electrode as enzyme-free sensor to monitor H2O2 has been studied. The sensor exhibited a high sensitivity of 1717.14μAmM−1cm−2 and a low detection limit down to 0.11μM with a linear wide range from 50μM to 34.8mM with a fast response time of 2s. In addition, modified electrode performance was investigated by measuring current responses of the sensor for three weeks to confirm the great stability of the proposed sensor. Along with these considerable analytical advantages, the as-prepared composite showed very high specificity to H2O2 with complete elimination of interference from uric acid, ascorbic acid, dopamine and glucose. The sensor gave satisfactory results in a real sample, when employed for determination of H2O2 in lens cleaning solution.
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