Performance improvement in chemical oxygen demand determination using carbon fiber felt/CeO 2 -β-PbO 2 electrode deposited by cyclic voltammetry method

摘要: A three-dimensional (3D) structured electrode in which a compact CeO2-β-PbO2 particle layer on each carbon fiber the felt (denoted as CF/CeO2-β-PbO2) was fabricated using cyclic voltammetry (CV) method presence of CeO2 nanoparticles electrolyte and supposed to be used sensor for situ chemical oxygen demand (COD) detection. It found that codeposited with PbO2 onto anode, deposited crystals were tiny compacted other. The electrochemical behaviors demonstrate CF/CeO2-β-PbO2 possesses larger effective surface area, higher electrochemically catalytic activity, better mechanical stability compared anode without by CV or constant potential (CP) method. results COD determination show sensitivity (3.0 ± 0.02) × 10−3 mA cm−2/mg L−1, detection limit 3.6 mg L−1 (S/N = 3) linear range 30–8500 correlation coefficient (R) 0.9985 RSD within 5 %.