Energy band modulation in CuxP(x=3,1/2)/PbTiO3 via heterogeneous erection induced benign junction interface for enhanced photocatalytic H2 evolution

Abstract

Prompt recombination of photo-generated charges in semiconducting material strictly restrict photocatalytic process efficiency. Herein, coupling of CuxP nanoparticles and PbTiO3 nanoplates through inert atmosphere calcination process for outstanding H2 production has been reported. Uniform edging distribution of CuxP nanoparticles over PbTiO3 nanoplates; witnessed from TEM analysis revealed an intimate material contact for charge transportation to the active reaction sites of catalyst surface. Besides, junction interface between CuxP and PbTiO3 component; confirmed from XPS and Mott-Schottky analysis yield an amplified photo/electro-chemical and catalytic performance. A stronger photocurrent density via., H2O2 electron scavenger and larger photovoltage in junction material compared with PbTiO3 counterpart; follows higher surface charge transfer efficiency and slower potential decay with longer charge carriers lifetime simultaneously. The PbTiO3 nanoplates with an optimum amount of CuxP have achieved maximum H2 production attaining conversion efficiency of 9.72%. Consequently, a type-II energy band alignment mechanism has been proposed for enhanced H2 production.