An in situ generated 3D porous nanostructure on 2D nanosheets to boost the oxygen evolution reaction for water-splitting. Issue 12 (7th March 2022)

• Record Type: Journal Article
• Authors: Yu, Wenli; Chen, Zhi; Zhao, Ying; Gao, Yuxiao; Xiao, Weiping; Dong, Bin; Wu, Zexing; Wang, Lei
• Is Part Of: Nanoscale. Volume 14:Issue 12(2022)
• Page Start: 4566
• Page End: 4572
• Publication Date: 2022-03-07
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d1nr08007e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Superhydrophilic 2D nanosheets decorated with a 3D porous nanostructure exhibit outstanding electrocatalytic activity and stability toward OER and overall water-splitting. Abstract : Efficient oxygen evolution reaction (OER) electrocatalysts can accelerate the reaction kinetics of water-splitting for large-scale hydrogen generation. In this work, 2D nanosheets decorated with a 3D porous nanostructure, including Fe, Co and Ni elements, are developed via anodic cyclic voltammetry scanning (ACVs) in the presence of sodium sulfide (FeCoNi-NS-ACVs). The formed 2D nanosheets provide metal ions during ACVs to generate a 3D porous structure and also construct a hierarchical morphology to favor the transport of the electrolyte and release of produced gas bubbles. What's more, the developed FeCoNi-NS-ACVs possesses superhydrophilic and excellent electroconductivity properties. Benefiting from the above merits, FeCoNi-NS-ACVs exhibits excellent electrocatalytic performances for the OER with low overpotentials of 170 mV and 198 mV to drive 50 mA cm −2 and 100 mA cm −2, respectively, with a small Tafel slope of 64 mV dec −1 and remarkable durability over 50 h. Moreover, the FeCoNi-NS-ACVs also exhibits outstanding electrocatalytic activity and stability toward overall water-splitting.