Controlled Synthesis and Photoelectrochemical Performance Enhancement of Cu2?xSe Decorated Porous Au/Bi2Se3 Z-Scheme Plasmonic Photoelectrocatalyst

In this paper, uniform Cu2?xSe-modified Au/Bi2Se3 hybrid nanoparticles with porous shells have been prepared through a cation exchange method. Bi2Se3/Cu2?xSe Z-scheme heterojunction is introduced onto Au nanocube by replacing Bi3+ Cu2+. Owing to the effective coupling between core and semiconductor shells, Au/Bi2Se3/Cu2?xSe hybrids present broad strong plasmon resonance absorption in visible band. More intriguingly, carrier lifetime of photoelectrodes can be further tailored corresponding Cu2?xSe content. Through parameter optimization, 0.1-Au/Bi2Se3/Cu2?xSe electrode exhibits longest electron (86.03 ms) among all parallel samples, photoelectrochemical performance enhancement also observed tests. Compared that pure Bi2Se3 (0.016% at 0.90 V vs. RHE) (0.02% nanoparticles, maximum photoconversion efficiency photoanodes increased 5.87 4.50 times under simulated sunlight illumination, attributing cooperation effects. All results indicate combine eco-friendliness excellent harvesting capability effectively inhibiting charge recombination, which provide new idea for efficient solar-driven water splitting.