A Facile Chemical Precipitation Method for the Synthesis of Nd(OH)₃ and La(OH)₃ Nanopowders and their Supercapacitor Performances

Abstract

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 j j 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 À 1 at a power density of 796 W kg À 1 .[a] S.

In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

“…Energy storage devices such as batteries and supercapacitors play very significant, efficient, and affordable roles in the generation of renewable and sustainable energy sources and are viable alternatives to traditional non-renewable options. Supercapacitors have emerged as most promising sustainable energy storage devices due to long cycle life, high power density, and ultra-fast charging/ discharging time [4][5][6][7][8]. Moreover, due to the burgeoning research area of carbon-based nanomaterials such as graphene, nanotubes, nanodots, and quantum dots, the intensive development of supercapacitor energy storage devices has also been increased [9][10][11].…”

Recent Progress in Graphene‐Based Microsupercapacitors

“…[ 18–20 ] On the contrary, electrode materials such as transition metal oxides (TMOs)/transition metal hydroxides (TMHOs) (RuO 2 , MnO 2 , Co 3 O 4 , NiCo 2 O 4 , Ni(OH) 2 , Co(OH) 2 , etc. ), [ 21–38 ] conducting polymers (CPs) (polyaniline [PANI], polypyrrole [PPy], PTh, poly(3,4,‐ethylenedioxythiophene) [PEDOT]), [ 39–46 ] transition metal chalcogenides (TMCs) (MoS 2 , VS 2 , NiS 2 , CoSe, NiSe, MoSe 2 , MoTe 2 , NiCo 2 S 4 ), [ 47–73 ] and other materials such as MXene, [ 8,74–78 ] black phosphorus, [ 79 ] metal nitrides, rare‐earth oxide/hydroxides, [ 80–84 ] and metal–organic framework (MOF) [ 85–87 ] show a redox reaction mechanism which comes under pseudocapacitance category. Generally, these two electrode materials are merged to form composites or hybrids electrode materials are exhibiting better electrochemical performance.…”

“…[18][19][20] On the contrary, electrode materials such as transition metal oxides (TMOs)/transition metal hydroxides (TMHOs) (RuO 2 , MnO 2 , Co 3 O 4 , NiCo 2 O 4 , Ni(OH) 2 , Co(OH) 2 , etc. ), [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] conducting polymers (CPs) (polyaniline [PANI], polypyrrole [PPy], PTh, poly (3,4,-ethylenedioxythiophene) [PEDOT]), [39][40][41][42][43][44][45][46] transition metal chalcogenides (TMCs) (MoS 2 , VS 2 , NiS 2 , CoSe, NiSe, MoSe 2 , MoTe 2 , NiCo 2 S 4 ), and other materials such as MXene, [8,[74][75][76][77][78] black phosphorus, [79] metal nitrides, rareearth oxide/hydroxides, [80][81][82][83][84] and metalorganic framework (MOF) [85][86][87] show a redox reaction mechani...…”

Influence of the Hydrophilic Surface of Nanofiber Support on the Performance of Hybrid Supercapacitors

“…Supercapacitors [6][7][8][9] are classified into three types according to the mechanism of energy storage: electrical double−layer capacitors (EDLCs), pseudocapacitors (PCs), and hybrid supercapacitors (HCs). EDLCs store energy by charge separation at the electrodeelectrolyte interface, while PCs store energy through the Faradaic process.…”