Facile synthesis of flower-like PbO as a precursor to form nanodendritic PbO_2 for positive active material (PAM) of lead-acid electrochemical storage devices

摘要

Nanodendritic PbO_2 has been the attractive electrode material with unique morphology and enhanced electrochemical performance for lead-acid electrochemical storage devices. However, numerous studies have only investigated this unique material via electrodeposition technique. In this paper, flower-like PbO consisting three dimensional (3D) nanoflakes was successfully synthesized and used as a starting precursor to form nanodendritic PbO_2 via electrochemical oxidation at constant voltage. The improved electrochemical results displayed by the formed nanodendritic PbO_2 in cyclic voltammetry (CV) and initial discharge capacity, which is able to deliver 170mA h g~(-1) at 200 mA g~(-1), is significantly suggesting that the formation of nanodendrites on the primary surface of agglomerated PbO_2 provides larger crystallite network structures for better material utilization at high discharge rate.