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In this paper, uniform Cu_2−xSe-modified Au/Bi₂Se₃ hybrid nanoparticles with porous shells have been prepared through a cation exchange method. Bi₂Se₃/Cu_2−xSe Z-scheme heterojunction is introduced onto Au nanocube by replacing Bi³⁺ with Cu²⁺. Owing to the effective coupling between Au core and semiconductor shells, Au/Bi₂Se₃/Cu_2−xSe hybrids present a broad and strong plasmon resonance absorption in the visible band. More intriguingly, the carrier lifetime of Au/Bi₂Se₃/Cu_2−xSe hybrid photoelectrodes can be further tailored with corresponding Cu_2−xSe content. Through parameter optimization, 0.1-Au/Bi₂Se₃/Cu_2−xSe electrode exhibits the longest electron lifetime (86.03 ms) among all the parallel samples, and corresponding photoelectrochemical performance enhancement is also observed in the tests. Compared with that of pure Bi₂Se₃ (0.016% at 0.90 V vs. RHE) and Au/Bi₂Se₃ (0.02% at 0.90 V vs. RHE) nanoparticles, the maximum photoconversion efficiency of porous Au/Bi₂Se₃/Cu_2−xSe hybrid photoanodes increased by 5.87 and 4.50 times under simulated sunlight illumination, attributing to the cooperation of Z-scheme heterojunction and plasmon resonance enhancement effects. All the results indicate that Au/Bi₂Se₃/Cu_2−xSe porous hybrids combine eco-friendliness with excellent sunlight harvesting capability and effectively inhibiting the charge recombination, which provide a new idea for efficient solar-driven water splitting.