Porous g-C 3 N 4 /High-Entropy Perovskite La(Fe 0.2 Co 0.2 Ni 0.2 Cu 0.2 Cr 0.2 )O 3 Nanosheet Heterojunctions for Photocatalytic H 2 Evolution

The g-C3N4/La(Fe0.2Co0.2Ni0.2Cu0.2Cr0.2)O3 high-entropy perovskite porous nanosheet heterojunction is fabricated by an approach of the sol–gel-annealing method. The obtained g-C3N4/LaFeHEO shows obvious increased HER (hydrogen evolution reaction, ∼720.48 μmol·g–1·h–1)/photodegradation (∼0.03546 min–1) than that of g-C3N4 (∼72.0/12.5 folds) and La(Fe0.2Co0.2Ni0.2Cu0.2Cr0.2)O3 (∼94.9/66.9 folds) and shows good stability. It primarily can be ascribed to the charge matching. In this system, the g-C3N4/LaFeHEO heterojunction obtains appropriate potential gradient can improve the carrier efficiency, including increasing transport, extending lifetime, and reducing recombination, the Fe–Co–Ni–Cu–Cr polymetallic metastable ionic coupling with potential barrier regulation and charge generation/drive can further optimize carrier dynamics, as well as the ultrathin porous nanosheets structure can increase active sites, shorten pathway, and enhance structural stability. With charge kinetic equilibrium, g-C3N4/La(Fe0.2Co0.2Ni0.2Cu0.2Cr0.2)O3 achieves decent photocatalysis.