Superior anodic oxidation in tailored Sb-doped SnO ₂ /RuO ₂ composite nanofibers for electrochemical water treatment

Dimensionally stable RuO ₂ (RO)- and IrO ₂ -based anodes have been widely used for electrochemical water treatment but alternative materials are required due to their well-recognized drawbacks such as high-cost and low oxygen evolution potential. In an effort to minimize noble metal contents, we herein fabricated electrospun Sb-doped SnO ₂ (ATO)/RO composite nanofibers as new anode materials by controlling precursor ratios. These composite nanofiber anodes have one-dimensional nanostructure assembled with highly uniform ATO and RO nanoparticles and their oxygen evolution potential was successfully tailored by compositional change. The ATO/RO nanofiber anodes, even with a small amount of RO of 3% exhibited superior electrocatalytic performance in oxidative organic degradation; complete degradation of bisphenol A as a model substrate was achieved during 20 min-electrolysis on ATO/RO anodes at a low current density of 3 mA⋅cm ⁻² . This strategy provides the optimization of oxygen evolution reaction and current efficiency, resulting in excellent capability for electrochemical water treatment.