Abstract
CeO2/PPy composites with obvious electrocatalytic activity were synthesized by a simple heat treatment method. The structure and morphology of CeO2/PPy composites were characterized by XRD and SEM. The effects of Tween80/sodium dodecyl benzene sulfonate and hydrothermal reaction time on morphology control were studied, and the morphology formation mechanism was proposed. The CeO2/PPy composite was prepared by in situ compounding. The CeO2/PPy composite was coated on a glassy carbon electrode to obtain an electrochemical sensor for detecting sodium nitrite. The anode peak current was proportional to the concentration of sodium nitrite in the range 0.125–22.5 mmol/L (R = 0.996), and the detection limit was 0.08 μmol/L. The CeO2/PPy composite sensor is easily synthesized, low in equipment cost, and wide in dynamic range.
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