Nanocomposite Hybrid Molecular Materials for Application in Solid-State Electrochemical Supercapacitors

Abstract

Molecular hybrid materials formed from polyoxometalates dispersed in conducting polymers represent an innovative concept in energy storage. This work reports in detail the first practical realization of electrodes based on these materials for energy storage in electrochemical supercapacitors. The molecular hybrids PAni/H4SiW12O40, PAni/H3PW12O40, and PAni/H3PMo12O40 (PAni: polyaniline) have been prepared electrochemically on platinum or carbon substrates, with PAni/H3PMo12O40 being the prototypical example presenting the best energy‐storage performance in the series. This hybrid displays the combined activity of its organic and inorganic components to store and release charge in solid‐state electrochemical capacitor cells, leading to a promising value of 120 F g–1 and good cyclability beyond 1000 cycles.

Electrochemical study of H3PMo12 retention on Vulcan carbon grafted with NH2 and OH groups

“…We have selected the -OH group as a model group to graft on Vulcan carbon, because it represents the least oxidized functional group of all oxygen-based groups. In addition, interactions of the molecular oxides have previously been reported with amine groups over silica [45][46][47], amine groups in polyaniline [24,25], polypyrrole [48], and polyethylenimine [49]. Therefore, we also grafted an amine group onto the carbon matrix.…”

“…Molecular oxides have been incorporated in different solid matrices, such as zirconia [18], silica [19], alumina [20], TiO 2 [21], and zeolites [3], exhibiting desorption problems due to weak bonding with the matrix. POM particles have also been deposited on electrode surfaces and immobilized into or within conducting polymers to modify their properties [11,[22][23][24][25][26]. Furthermore, they have been incorporated in a diversity of carbon matrices such as activated carbon [15,16,27], carbon cloth and fibers [4,5], gels [6] and aerogels [14], pastes [7,8], nanofibers [12], multiwalled carbon nanotubes [9-11, 13, 28-33], and graphene [10,11,[34][35][36][37] and electrodeposited onto vitreous carbon substrates [38,39].…”

Polyaniline integrated carbon nanohorn: A superior electrode materials for advanced energy storage

“…Recently, supercapacitors have been a major source for huge amount of energy in a very small period of time and make them essential for surge power delivery. Supercapacitors have been considered most promising materials for alternative energy sources in the different device and electronics applications due to their rapid charging-discharging rates, high power density and long cycle life (>100 000 cycles) [1][2][3]. Thus, they have been taken as more important components for all electric cars and cars based on fuel cells like hydrogen fuel cell and direct methanol fuel cell (DMFC) in the modern generation [4,5].…”

Electrochemical Characteristics of Polyoxometalate/Polypyrrole/Carbon Cloth Electrode Synthesized by Electrochemical Deposition Method

“…Gómez-Romero et al described preparation of POM-incorporated conducting polymer nanocomposites based on their strong electrostatic interactions. This study showed high specific capacitances of 120 F/g for POM-doped polyaniline [23]. Freund et al reported a higher specific capacitance (210 F/g) for pseudocapacitors based on porous structure of POM-doped polypyrrole electrodes [24].…”