Distinctive graphdiyne coupled with phosphorylation NiFe-LDH S-scheme heterojunction for photocatalytic overall water splitting

Abstract

Most of the photocatalytic reactions currently involved require the use of precious metals or sacrificial reagents to achieve more desirable reactivity and stability. It is urgent to find low-cost photocatalysts that can be stable overall pure water splitting with high efficiency. Graphdiyne (GDY), as the youngest member of the carbon family, has received extensive attention in numerous fields. Herein, the innovative strategy of S-scheme heterojunction composite photocatalysts use to heterogeneous catalysis produce of H2 and H2O2 from photocatalytic pure water splitting is designed using of graphdiyne (GDY) and phosphorylation NiFe layered double hydroxide (NiFe-P). The electron transfer mechanism of S-scheme heterojunction catalyst was verified with in-situ irradiation X-ray photoelectron spectroscopy and hydroxyl radical capture experiments. Achieving multiphase catalysis in pure water, the hydrogen production rate reached 928 μmol h-1g−1, and the H2O2 production rate reached 674 μmol h-1g−1. This work provides new effective scheme for studying the charge transfer pathway of S-scheme heterojunction and feasible methods for constructing efficient photocatalytic-driven pure water splitting reactions.