Reparation and Electrochemical Performance of Acetylene Black-Doped Ti-PbO2 Electrode with High Electron Transfer Rate

During the electrochemical preparation process, the electron transport rate in the PbO 2 active layer could be greatly increased resulting from reduction in the oxidation of the Ti substrate, which effectively improved the service life and catalytic degradation efficiency of the PbO 2 Dimension Stable Anode (PbO 2 DSA) electrode. Through adding nano-acetylene black (ACET) and polyvinyl pyrrolidone (PVP) into the plating solution, an ACET doped Ti/PbO 2 electrode was successfully prepared via an anodic oxidation method. Results of field emission scanning electron microscope (FESEM), diffraction of X-rays (XRD), transmission Electron Microscope(TEM) and X-ray photoelectron spectroscopy (XPS) characterization indicated that 2.10 ∼ 2.75 wt% of ACET doping amount hardly changed the morphology and lattice constant of the PbO 2 electrode. With electrochemical alternating current impedance spectroscopy (EIS) and cyclic voltammetry (CV), it confirmed that ACET reduced the charge transfer impedance (Rct) of the PbO 2 electrode up to 95%, and restrained the potential of oxygen evolution reaction(OER). With the increase of electron transport rate, the generation rate of hydroxyl radicals (·OH) on the electrode surface was enhanced significantly. Compared with the Ti/PbO 2 electrode, the ACET-doped Ti/PbO 2 electrode exhibited higher electrocatalytic efficiency to phenol degradation. During the degradation process, the consumption of time and energy could be reduced by 33% and 34%, respectively. At the same current density, the required voltage for preparing the ACET-modified Ti/PbO 2 electrode was much lower. In the assistant of lower deposition voltage, the ACET-doped Ti/PbO 2 electrode possessed a stronger binding force to Ti substrate, and meanwhile obtained a longer lifespan.