Near-infrared responsive reduced graphene oxide supported CuS: Enhanced electrocatalytic hydrogen evolution performance. (14th October 2021)

• Record Type: Journal Article
• Authors: Wang, Honggui; Hu, Lang; Zhou, Huihui; Zhang, Ya
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 71(2021)
• Page Start: 35239
• Page End: 35247
• Publication Date: 2021-10-14
• Subjects: Copper sulfide -- Near-infrared -- Reduced graphene oxide -- Photoelectrocatalytic hydrogen evolution; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.08.078
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Various reduced graphene oxide supported CuS (RGO-CuS) composites were obtained via a hydrothermal way in this work. The as-obtained RGO-CuS with a low bandgap of ~1.24 eV showed significant light absorption in near-infrared (NIR) region. In acidic media, the optimized 0.1RGO-CuS needed an overpotential of 179 mV (at 10 mA cm −2 ) to trigger the hydrogen evolution reaction under NIR light. And the lowest Tafel slope of 0.1RGO-CuS (61 mV dec −1 ), suggesting that the photoelectrocatalytic hydrogen evolution was performed under the Volmer-Heyrovsky mechanism. The 0.1RGO-CuS displayed a good durability after 5000 cycles in acid. According to the results of EIS measurement, both NIR irradiation and RGO modification could effectively lower charge transfer resistance and improve charge transport rate of the photoelectrochemical process. The introduction of RGO could improve the electron and hole separation ability of the photoelectrochemical process, which resulted in an enhanced photoelectrocatalytic HER performance. Graphical abstract: Image 1 Highlights: A p-type RGO-CuS composite with bandgap of ~1.24 eV was synthesized in this work. The RGO-CuS showed remarkable NIR light response. The noble metal free RGO-CuS composite exhibited good and stable HER performance.