Photocatalytic overall water splitting without noble-metal: Decorating CoP on Al-doped SrTiO3

CoP, a noble-metal-free cocatalyst, was first introduced onto the surface of Al-doped SrTiO3 (Al:STO) via an in situ photodeposition-phosphorization method for photocatalytic overall water splitting (POWS) into stoichiometric H-2 and O-2. Compared with pure Al:STO, the POWS activity was enhanced by a factor of similar to 421 over 1.0%CoP/Al:STO, with the highest evolution rates of 2106 and 1002 lmol h(-1) g(-1) for H-2 and O-2, respectively. The mechanism for the remarkably boosted POWS activity was systematically analyzed based on the comprehensive characterization. On the one hand, benefiting from the in situ photodeposition process, CoP with metallic character were intimately decorated onto the surface of Al:STO and accelerated the separation and migration of photoinduced charge carriers. On the other hand, CoP, serving as reactive sites for H-2 evolution reaction, lowered the overpotential and facilitated the surface reduction reaction, thereby enhancing the POWS activity. Furthermore, Cr2O3 was photodeposited on the surface of 1.0%CoP/Al:STO composite to suppress the undesired reverse reaction and the POWS activity was further enhanced up to 3558 and 1722 lmol h(-1) g(-1) for H-2 and O-2, respectively, with apparent quantum yield of 7.1% at 350 +/- 10 nm. This work presents a new avenue for designing POWS system without noble-metal cocatalyst. (C) 2021 Published by Elsevier Inc.

Automated summary

In this study, CoP was introduced onto the surface of Al-doped SrTiO3 through an in situ photodeposition-phosphorization method for photocatalytic overall water splitting. The POWS activity was significantly enhanced by CoP, which acted as reactive sites for H2 evolution reaction and facilitated surface reduction reaction. Further improvement was achieved by photodepositing Cr2O3 on the composite surface to suppress undesired reverse reaction. This work presents a new avenue for designing noble-metal-free cocatalyst system for photocatalytic overall water splitting.