Boosting electrocatalytic oxygen evolution activity by in-situ growth of hierarchical vertically-erected Ni(OH)2 nanosheets on Ag nanowires. (29th August 2022)

• Record Type: Journal Article
• Authors: Nguyen, Van-Toan; Nguyen, Van-Cuong; Phan, Thi Chuyen; Choi, Ho-Suk; Kim, HyunChul
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 74(2022)
• Page Start: 31614
• Page End: 31623
• Publication Date: 2022-08-29
• Subjects: Hierarchical Ni(OH)2 nanosheet -- Silver nanowire -- Oxygen evolution reaction -- Water oxidation -- Electrocatalyst; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.06.017
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A core-shell hierarchical nanoarchitecture consisting of Ni-layered double hydroxide nanosheets (Ni(OH)2 NSs) grafted on Ag nanowires (Ag NWs) backbone is rationally designed and built by an in situ growth route, in which Ag NWs act as core and Ni(OH)2 NSs as shell. The resulting hybrid material (Ag NW@Ni(OH)2 NS), displayed a three-dimensional structure with a well-defined core-shell configuration and enlarged surface area, exhibits excellent electrocatalytic performance and enhanced durability. An electrochemical analysis exhibits that the Ag NW@Ni(OH)2 NS-2H catalyst is a low overpotential of 290 mV required the achievement of a current density at 10 mA cm −2 (j10 ) and excellent long-term stability sustained over 24 h with only 6% potential increment at j10 versus initial potential. Unique micro/macrostructure and synergistic effects are responsible for the extraordinary electrochemical performance of Ag NW@Ni(OH)2 NS-2H core-shell composite. Ag NWs behave like a high conductive backbone due to their low intrinsic resistance, thus promoting charge transfer, whereas the hierarchical Ni(OH)2 nanosheets, with huge surface area, provide a large number of active sites for oxygen evolution reaction, leading to enhanced electrochemical activity. Graphical abstract: Image 1 Highlights: Hierarchical nickel double layer hydroxide nanosheet ((Ag NW@Ni(OH)2 NS) architectures were grown on silver nanowires. Ag NW@Ni(OH)2 NS were explored as a novel and durable electrocatalyst for catalyzing OER in alkaline media. Synergistic effects of ionic/electric channels are responsible for the extraordinary OER performance of Ag NW@Ni(OH)2 NS. The optimized Ag NW@Ni(OH)2 NS-2H catalyst maintains 94% of the initial potential after 24 h.