关键词: PbO₂-Nd 阳极, 电化学性能, 电催化活性, 耐久性

Abstract:

Neodymium (Nd) doped titanium (Ti)-based lead dioxide (PbO₂) composite anode was prepared by electrodeposition. The surface morphologies and crystal structures of the as-prepared anodes were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) technique, respectively. The electrochemical performances of PbO₂-Nd anode were studied by electrochemical impedance spectroscopy, linear sweep voltammetry and cyclic voltammetry. Additionally, the electrocatalytic activity and durability of PbO₂-Nd anode were investigated through the degradation of simulative refractory organic wastewater of phenol. The results showed that Nd doping made the PbO₂ anode surface structure dense and uniform with smaller sized crystal particles, which increased the specific surface area and improved the electrochemical properties of the anode. The surface crystal structures of PbO₂ and PbO₂-Nd anodes were mainly composed of β-PbO₂. Furtheremore, Nd doping improved the crystal purity of β-PbO₂, changed the relative abundance of the surface phase and promoted the formation of β(101) crystal plane. Moreover, the PbO₂-Nd anode exhibited smaller electrochemical reaction resistance, higher oxygen evolution potential, stronger electron exchange capacity and longer life time than PbO₂ anode. Upon electrocatalytic degradation of phenol wastewater with the PbO₂-Nd anode for
3 h, the removal rate of phenol and COD reached 85.7% and 73.8%, respectively. The electrocatalytic activity of the PbO₂-Nd anode had no significant attenuation after being used for 6 times. The PbO₂-Nd anode possessed better electrocatalytic activity and durability than PbO₂ anode.

Key words: PbO₂-Nd anode, electrochemical performance, electrocatalytic activity, durability