CuO/PbTiO₃: A new-fangled p–n junction designed for the efficient absorption of visible light with augmented interfacial charge transfer, photoelectrochemical and photocatalytic activities

Abstract

The asymmetric photocurrent in opposite directions and the rectifying behaviour of all the CuO/PbTiO3 samples reveal the formation of a p–n junction between them, this helps to augment the charge anti-recombination process at the interface and enhance the photocatalytic performance.

Hydrothermal Synthesis of rGO/PbTiO3 Photocatalyst and Its Photocatalytic H2 Evolution Activity

“…The Ti 2p core level spectrum from Figure 7(b) could be observed at the binding energies of around 464.3 eV (Ti 2p1/2) and 458.3 eV (Ti 2p3/2) for PbTiO 3 (below spectrum), in agreement with the reported work [33]. For the PGO060 (above spectrum), a pair of new peaks was found, which locates at 456.1 and 461.8 eV, respectively.…”

Preparation and photocatalytic performance of TiO2/PbTiO3 fiber composite enhanced by external force induced piezoelectric field

“…In the XPS spectrum for Pb 4f (Figure B), the two peaks Pb 4f 1 and Pb 4f 3 for Pb 4f(7/2) and Pb 4f(5/2) are located at 137.7 and 142.5 eV, respectively. The Pb 4f spin‐orit splitting Δ(4f(7/2)‐4f(5/2)) is 4.8 eV, indicating of an oxidation state of +2 for Pb in PbTiO 3 . The other two peaks Pb 4f 2 and Pb 4f 4 are located at 138.7 and 143.5 eV, respectively, indicating of an oxidation of +4 for Pb .…”

“…The Pb 4f spin-orit splitting Δ(4f(7/2)-4f(5/2)) is 4.8 eV, indicating of an oxidation state of +2 for Pb in PbTiO 3 . 33,34 The other two peaks Pb 4f 2 and Pb 4f 4 are located at 138.7 and 143.5 eV, respectively, indicating of an oxidation of +4 for Pb. 35 In the XPS spectrum of Ti 2p ( Figure 2C), the two fitted peaks Ti 2p 1 and Ti 2p 3 for Ti 2p(3/2) and Ti 2p(1/2) are located at 458.0 and 464.0 eV, respectively, indicating the Ti 4+ in PbTiO 3 .…”

Photocatalytic Degradation of Congo Red Using PbTiO3 Nanorods Synthesized via a Sonochemical Approach

“…The photoluminescence spectrum of PbTiO 3 contains all the emission peaks in the range of 451–550 nm and peak at 470 nm i. e. the strong emission which might be responsible for photo‐generated charge carriers on the surface ,…”