Enhanced Stability of the Modified PbO2 Electrode for Electrochemical Catalysis
LIU Jicheng1, YANG Renkai1,2,*, CHEN Guisheng3, SUN Si3, HAN Xiaoyu3, TIAN Jie3, LI Xiaolin4,*
1 Chongqing Water Group Co., Ltd., Chongqing 400015, China 2 College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China 3 Chongqing Three Gorges Water Service Co., Ltd., Chongqing 401122, China 4 College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
Abstract: Lead dioxide (PbO2) has been regarded as a promising anodic material with superior activity for electrochemical degradation of the organic waste water. However, the PbO2 electrode usually suffers from poor stability and the leached lead ions can cause even more serious pollution to the environment. In this work, to enhance the stability of the PbO2 electrode, a 10.0 μm of α-PbO2 thin film is deposited into the Ti/SnO2-Sb2O3/β-PbO2 electrode. The α-PbO2 layer can not only increase the lattice matching between the SnO2-Sb2O3 and the β-PbO2 layer but also decrease the internal stress between two different films. With the addition of α-PbO2 thin film, the Ti/SnO2-Sb2O3/α-PbO2/β-PbO2 modified electrode shows almost the same electrocatalytic activity as the Ti/SnO2-Sb2O3/β-PbO2 electrode, but the stability is greatly improved. In the electrochemical oxidation of toluene diamine (TDA), the modified electrode with the α-PbO2 film could stay at a current density of 2.0 A/cm2 for as long as 750 min in a 4.0 mol/L H2SO4 solution, which was 1.56 times longer than that of the Ti/SnO2-Sb2O3/β-PbO2 electrode. The degradation pathway of TDA was also studied in detail. This work reports a facil and promising way to stabilize the modified PbO2 electrode for electrochemical degradation of organic pollutants.
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