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A Facile Chemical Precipitation Method for the Synthesis of Nd(OH) 3 and La(OH) 3 Nanopowders and their Supercapacitor Performances
Author(s) -
Arunachalam Subasri,
Kirubasankar Balakrishnan,
Rajagounder Nagarajan Erumaipatty,
Vellasamy Devadoss,
Angaiah Subramania
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.201803151
Subject(s) - supercapacitor , materials science , electrochemistry , cyclic voltammetry , hydroxide , separator (oil production) , electrolyte , capacitance , electrode , fluoride , dielectric spectroscopy , precipitation , neodymium , coprecipitation , inorganic chemistry , chemical engineering , chemistry , laser , physics , meteorology , optics , thermodynamics , engineering
A facile chemical precipitation method is used to prepare both lanthanum hydroxide [La(OH) 3 ] and neodymium hydroxide [Nd(OH) 3 ] nanopowders in an ambient temperature without the addition of any surfactants. Both rare‐earth hydroxides nanopowders are characterized by X‐ray diffraction and FE‐SEM analysis. The supercapacitor performances of La(OH) 3 and Nd(OH) 3 electrodes are studied by cyclic voltammetry, electrochemical AC‐impedance and galvanostatic charge‐discharge studies. It revealed that Nd(OH) 3 electrode possesses a high specific capacitance ( C sp ) than La(OH) 3 electrode. Hence, an asymmetric supercapacitor device is fabricated and denoted as Nd(OH) 3 ||AC in 6 M KOH as the electrolyte soaked in the electrospun poly(vinylidene fluoride) membrane as the separator, which exhibited an energy density of 18.8 Wh kg −1 at a power density of 796 W kg −1 .