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Two layers of α-PbO2- and CeO2-doped β-PbO2 were anodically deposited on Ni foam substrate successively, and the prepared Ni/α-PbO2/CeO2-β-PbO2 electrode was used as a sensor to determine chemical oxygen demand (COD) by coulometric method. SEM and EDS disclose that the layers of α-PbO2 and β-PbO2 are compactly attached to the surface of the 3D structure substrate, and CeO2 is uniformly co-deposited...
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