Ultrathin nickel oxide nanosheets: Highly exposed Ni3+-doped high-energy {110} facets. (July 2021)

• Record Type: Journal Article
• Authors: Patra, Astam K.; Sarkar, Sunny; Kim, Dukjoon
• Is Part Of: Materials research bulletin. Volume 139(2021)
• Publication Date: 2021-07
• Subjects: TG Thermogravimetry -- DTA Differential thermal analysis -- HRTEM high-resolution transmission electron microscopy -- SAED Selected area electron diffraction -- FFT fast Fourier transform -- FESEM field emission scanning electron microscopy -- XPS X-ray photoelectron spectroscopy; Ultrathin nanosheets -- 2D nanomaterials -- Ni(OH)2 nanosheets -- NiO nanosheets -- Ni3+ doped NiO -- NiO {110} facets; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111251
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: The present studies demonstrate an easy way to synthesize high-quality NiO nanosheets with highly exposed high-energy {110} facets. The nanosheets with <10 nm thickness and abundant defects (Ni 3+ ) were successfully prepared. Highlights: Ultrathin Nickel Oxide Nanosheets has been developed by simple method. NiO nanosheets contain highly exposed Ni 3+ doped high-energy {110} Facets. Thickness of NiO nanosheets are <10 nm and show high aromatic aldehyde reduction property. Abstract: Ultrathin NiO nanosheets with high surface-energy facets are gaining attention, owing to their excellent catalytic property. Two-dimensional NiO nanocrystals generally possess a large lateral size and thickness exhibit a lack of coordinatively unsaturated active/reactive edge and corner sites, which can adversely affect their properties. In this study, round-ultrathin NiO nanosheets (diameter ≈ 60–300 nm, thickness <10 nm) were synthesized using a hydrothermal method followed by calcination. Upon increasing the concentration of NaOH in the medium, the sizes of these nanosheets increased without any change in their thickness. The nanosheets were characterized via powder-XRD, field-emission scanning electron microscopy, high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) analysis. HRTEM and SAED revealed that these NiO nanosheets mainly comprised an exposed high-energy {110} surface. XPS analysis revealed that an unsaturated Ni 3+ site was present in the NiO nanosheets. The NiO nanosheet exhibited high-catalytic activity for the aromatic-aldehyde reduction reaction.