Synthesis, surface characteristics, and electrochemical capacitance of Cu-doped carbon xerogel microspheres

Microporous carbon spheres derived from resorcinol-formaldehyde solutions. A new approach to coat supports

“…Another aspect worth bearing in mind, as it amends the final properties of carbon spheres, are the precursors employed, which comprise but are not limited to polymers, biomass-derived carbons, phenolic resins, benzene derivatives and other heterocyclic aromatic organic compounds [2,4,6]. Of these, phenolic resins have attracted most attention as carbon sphere precursors [7][8][9][10][11][12][13][14][15][16][17], and particularly resorcinol-formaldehyde (RF) precursor solutions which, as has been extensively reported, generally give rise to carbon gels [18][19][20][21][22][23].…”

“…This method involves the use of additives such as ammonia, ethanol or templates, as well as long processing times. Another method that is widely used is that of inverse emulsion, where not only the use of additives is required but also a full control over the viscosity [11,17].…”

“…Leaving aside the above mentioned drawbacks, each of these techniques leads to carbon spheres with different final properties, and hence, the choice of the appropriate synthesis method will depend on the application for which the carbon spheres are intended. The widely-recognized advantages of RF solutions as carbon precursors (which include the possibility of tailoring their porous properties or of doping them with metals and 3 heteroatoms [11,24]), confer on them great potential for preparing carbon spheres that offer optimum performances in a wide variety of applications, such as adsorption [1,25], ultrafiltration [26], catalysis [16] or electrochemical systems [9,13,15,17]. In some of these applications carbon spheres are used as coating of surfaces, nanoparticles or supports and, in these cases, spray-drying methods are preferable.…”

Nanoporous Cu–C composites based on carbon-nanotube aerogels

“…30 Several different strategies have been reported to realize nanoporous metal-carbon composites based on modications of the traditional sol-gel synthesis of CAs by pyrolysis of polymeric gels. For example, Cu, [31][32][33][34] Co, [34][35][36][37] Ni, 32,34,35 Fe, 32,34,38,39 Ir, 40 Mo, 41 Pt, 42 Pd, 34 Mn, 37 Ce, 43,44 and Zr 43,44 NPs have been successfully incorporated into CAs, albeit limited to relatively low loadings of (20 wt% and large monolith densities of T100 mg cm À3 .…”

One‐Step Synthesis and High‐Efficiency Decoloration of Multifunctional Porous‐C/Fe3O4 Nanospheres by Using a Sandwich‐Structured Precursor with Three Roles

“…[18][19][20][21][22][23] In general, the strategies for fabricating the composites (surface coating of the carbon spheres) usually first entail the synthesis of the carbon spheres and then growth of a coating material by using as-obtained carbon spheres as templates. [18][19][20][21][22][23] In general, the strategies for fabricating the composites (surface coating of the carbon spheres) usually first entail the synthesis of the carbon spheres and then growth of a coating material by using as-obtained carbon spheres as templates.…”