Solution-processed GaSe nanoflake-based films for photoelectrochemical water splitting and photoelectrochemical-type photodetectors
作者： Marilena Isabella Zappia , Gabriele Bianca , Sebastiano Bellani , Michele Serri , Leyla Najafi
关键词: Photodetector 、 Light intensity 、 Photocatalysis 、 Water splitting 、 Oxygen evolution 、 Linear sweep voltammetry 、 Reversible hydrogen electrode 、 Responsivity 、 Optoelectronics 、 Materials science
摘要: Gallium selenide (GaSe) is a layered compound, which has been exploited in nonlinear optical applications and photodetectors due to its anisotropic structure pseudo-direct gap. Theoretical studies predicted that two-dimensional (2D) form potential photocatalyst for water splitting reactions. Herein, we first report the photoelectrochemical (PEC) characterization of GaSe nanoflakes (single-/few-layer flakes), produced via liquid phase exfoliation, hydrogen evolution reaction (HER) oxygen (OER) both acidic alkaline media. In 0.5 M H2SO4, photoelectrodes display best PEC performance, i.e. ratiometric power-saved metric HER ({\Phi}saved,HER) 0.09% OER ({\Phi}saved,OER) 0.25%. When used as PEC-type photodetectors, show responsivity ~0.16 A W-1 upon 455 nm illumination at light intensity 63.5 uW cm-2 applied -0.3 V vs. reversible electrode (RHE). The stability analysis evidences durable operation over tens cathodic linear sweep voltammetry scans H2SO4 HER. Viceversa, degradation effects have observed anodic highly oxidizing environment O2-induced (photo-)oxidation effects. Our results provide new insight into properties their exploitation photoelectrocatalysis, (bio)sensors.
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