TY - JOUR
T1 - Shape-selective synthesis of NiO nanostructures for hydrazine oxidation as a nonenzymatic amperometric sensor
AU - Vikraman, Dhanasekaran
AU - Park, Hui Joon
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2016
Y1 - 2016
N2 - In this work, we demonstrate the shape-dependent electrocatalytic activity of NiO NPs towards hydrazine oxidation. For this purpose, NiO NPs, having pellet, rod, dot and cuboid-shapes, were synthesized using a variety of reducing agents such as sodium hydroxide (NaOH) with polyethylene glycol (PEG), NaOH without PEG, ammonia (NH3), and sodium carbonate (Na2CO3) via a simple and low cost sol-gel approach. Moreover, NiO-silica core-shell (NiO@SiO2) NPs were prepared using TEOS as a source of the porous silica. The morphological structures of these NPs were characterized by field emission-scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). From the X-ray diffraction (XRD) results, a face-centered cubic (fcc) NiO crystalline structure was confirmed and the estimated size of the crystalline NPs was in the range of 2.7-12.5 nm depending on the reducing agents utilized for the synthesis. Moreover, their characteristics were further investigated by Raman spectroscopy. From the cyclic voltammetry results, it was shown that the nano-pellet shape NiO exhibited the best electrocatalytic performance for hydrazine oxidation and stability, promising for fuel cell application.
AB - In this work, we demonstrate the shape-dependent electrocatalytic activity of NiO NPs towards hydrazine oxidation. For this purpose, NiO NPs, having pellet, rod, dot and cuboid-shapes, were synthesized using a variety of reducing agents such as sodium hydroxide (NaOH) with polyethylene glycol (PEG), NaOH without PEG, ammonia (NH3), and sodium carbonate (Na2CO3) via a simple and low cost sol-gel approach. Moreover, NiO-silica core-shell (NiO@SiO2) NPs were prepared using TEOS as a source of the porous silica. The morphological structures of these NPs were characterized by field emission-scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). From the X-ray diffraction (XRD) results, a face-centered cubic (fcc) NiO crystalline structure was confirmed and the estimated size of the crystalline NPs was in the range of 2.7-12.5 nm depending on the reducing agents utilized for the synthesis. Moreover, their characteristics were further investigated by Raman spectroscopy. From the cyclic voltammetry results, it was shown that the nano-pellet shape NiO exhibited the best electrocatalytic performance for hydrazine oxidation and stability, promising for fuel cell application.
UR - http://www.scopus.com/inward/record.url?scp=84987858643&partnerID=8YFLogxK
U2 - 10.1039/c6ra12805j
DO - 10.1039/c6ra12805j
M3 - Article
AN - SCOPUS:84987858643
SN - 2046-2069
VL - 6
SP - 86101
EP - 86107
JO - RSC Advances
JF - RSC Advances
IS - 89
ER -