Ni7S6 decorated g-C3N4/graphene oxide composites for enhanced visible light photocatalytic hydrogen evolution

Abstract

Rationally designing high-efficient g-C3N4 based photocatalysts still remains a big challenge. Herein, Ni7S6 decorated K-doped g-C3N4/graphene oxide photocatalyst was synthesized. Interestingly, amorphous conductive carbon black and urea are simultaneously transferred to graphene oxide and K-doped g-C3N4, which achieves in-situ coupled K-g-C3N4/graphene oxide composite. The in-situ fabricated graphene oxide acts as a charge transfer substrate for the rapid photocarriers migration. Ni7S6 forms Schottky heterojunction with K-g-C3N4 photocatalyst, promoting photocarriers separation. The Ni7S6/K-g-C3N4/graphene oxide composite achieves a visible light hydrogen production rate of 487.59 μmol·g−1·h−1, which is about 7.5 times higher than that of K-g-C3N4 (65.4 μmol·g−1·h−1). This work provides a novel strategy for preparing high-efficient g-C3N4 based photocatalysts.