1. Introduction
PbTiO3, a perovskite oxide, is an important material for its piezoelectricity, ferroelectricity, and colossal magnetoresistivity, which makes it highly attractive for fundamental research and various technical applications [1e4]. Recently, perovskite-type ox- ide materials based on transition metals with d(0) and d(10) elec- tron configuration such as Nb(V), Ti(IV) and In(Ⅲ) were reported as efficient photocatalysts for overall water splitting with high quan-
tum yields [5]. Pb2þ-containing transition-metal oxides were found
to be able to absorb visible light due to their smaller band gap sizes [6]. PbTiO3, a d(0) and d(10) metal oxide, can be used as an efficient visible-light photocatalyst for overall water splitting [7].