Design of hybrid materials based on carbon nanotubes and polyoxometalates

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

“…Nevertheless, the high solubility of POMs in typical solvents has caused them to be ignored as active compounds for solid-state technology, because they would need to be anchored to a solid framework. POMs with Keggin structure consist of metallic oxide nanoclusters (≈1.5 nm) with formula [XM 12 O 40 ] 3− , constructed from a central tetrahedron (XO 4 − , X = non-metal, PO 4 3− , SiO 4 4− ) surrounded by 12 metal-oxygen octahedra linked by shared edges and corners (MO 6 , where M = metal, MoO 6 , WO 6 ). These polyanions have been studied in many solid-state applications: heterogeneous catalysis [3][4][5][6], amperometric Electronic supplementary material The online version of this article (doi:10.1007/s10008-015-2994-5) contains supplementary material, which is available to authorized users.…”

“…sensors and fuel cells due to their electrocatalytic properties [7][8][9], and more recently, in supercapacitors [10][11][12][13][14][15][16].…”

“…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]. These types of carbon matrices compared to others can strongly immobilize these molecular oxides, showing low solvent desorption due to covalent bonds between the functional groups present on the surfaces of the carbons and oxides [9,11,13,30,32,40].…”

“…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]. These types of carbon matrices compared to others can strongly immobilize these molecular oxides, showing low solvent desorption due to covalent bonds between the functional groups present on the surfaces of the carbons and oxides [9,11,13,30,32,40]. It has been studied that the immobilization, anchoring, or addition of these oxides in the carbon matrices involve a strong and irreversible adsorption [11,32,40], which is increased by the microporosity [11,27] and the hydrophilic nature of the carbon matrix [11], and by the creation of oxygen-based functional groups [9,11,13,30,32].…”

A study on the dependence of structure of multi-walled carbon nanotubes on acid treatment

“…The exfoliation of MWNTs bundles, as functional group, increases the solubility of MWNTs in polar media [2,3], and more easily incorporated in a polymer matrix. The treatment of MWNTs is more widely done by aqueous solution of acids or oxidizing agents such as nitric acid [14,15], sulfuric acid [16], H 2 SO 4 /HNO 3 [17,18], H 2 O 2 [17], etc.…”