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Influence of Pamoic Acid as a Complexing Agent in the Thermal Preparation of NiO Nanoparticles: Application to Electrochemical Water Oxidation
Author(s) -
Qasem Mohammed Ameen Ahmed,
Aziz Md. Abdul,
Qamaruddin Muhammad,
Kim JongPil,
Onaizi Sagheer A.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702340
Subject(s) - non blocking i/o , thermal decomposition , x ray photoelectron spectroscopy , nuclear chemistry , thermogravimetric analysis , nanoparticle , fourier transform infrared spectroscopy , nickel , inorganic chemistry , materials science , transmission electron microscopy , electrochemistry , chemistry , analytical chemistry (journal) , chemical engineering , electrode , nanotechnology , organic chemistry , catalysis , engineering
We developed a thermal decomposition method for preparing NiO nanoparticles (NiONPs) using disodium salt of pamoic acid (Na 2 PA) as a complexing agent and Ni(NO 3 ) 2 ⋅6H 2 O as a nickel precursor. Prior to thermal decomposition, Ni(NO 3 ) 2 ⋅6H 2 O was mixed with Na 2 PA in ethanol, and the ethanol was evaporated succesively. The dried reaction mass was characterized using Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and thermal gravimetric analysis. Thermal decomposition was then performed in air to obtain the NiONPs. The role of Na 2 PA in the synthesis of NiONP was evaluated by preparing NiONPs according to the protocol described above without the addition of Na 2 PA. The X‐ray diffraction data indicated that crystalline NiO (bunsenite, cubic crystal system) formed with or without Na 2 PA; however, field emission scanning electron microscopy images showed that smaller monodisperse NiONPs formed only with the addition of Na 2 PA. Without Na 2 PA, the obtained NPs were quite large and polydisperse. The sizes of the NiONPs prepared in the presence of Na 2 PA were determined using transmission electron microscopy imaging to be 19.1 ± 3.2 nm. The electrocatalytic activity of the NiONPs toward water oxidation under alkaline conditions was evaluated by immobilizing the NPs onto an in‐house prepared filter paper derived carbon electrode, and compared.