Synthesis of CeO₂/PPy composites for use in the electrocatalytic detection of nitrite

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.

Keywords:

• CeO₂/PPy composite
• sodium nitrite
• electrochemical sensor

Funding

This work was supported by the National Natural Science Foundation of China (91958108, 41406055), the Natural Science Fund of Jiangsu Province (BK20170451, BK2018485, BK20181073, 17KJA430003),Six talent peaks project in Jiangsu Province (JNHB-143), “521” talent peaks project in Lianyungang City (LYG52105-2018044), Scientific and Technological Program of Lianyungang (JC1603), Project of Innovation for Undergraduate in Jiangsu Province (SD201911641107001, SZ201911641107002), the “Qing Lan Project of Jiangsu Province”, the Natural Science Fundation of Jiangsu Province Department of Education (15KJD150007, 17KJA430003), the “A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions”(PAPD).