Abstract
By investigating photoelectrochemical (PEC) performance of p and n-type Cu2O, we do an exploratory study on dual-photoelectrode tandem PEC cell consisting of p-Cu2O/Pt photocathode and n-Cu2O/Co–Pi photoanode for the first time. Benefiting from electron capture (Pt) and hole transfer (Co–Pi) layers, the photoelectrodes have better charge separation efficiency and faster charge transfer kinetics. The p-Cu2O/Pt||n-Cu2O/Co–Pi PEC cell finally achieves an unassisted photocurrent density of 0.09 mA/cm2 after illumination for 1000 s, which preliminarily confirms the viewpoint of unassisted overall water splitting. We then anticipate this work can provide a novel platform for the design and fabrication of various PEC energy conversion devices with excellent performance.
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