Porous carbon xerogels with texture tailored by pH control during sol–gel process

Compressing some sol-gel materials reduces their stiffness: a textural analysis

“…The preparation of resorcinol-formaldehyde xerogels was performed according to a previous study [9]. The resorcinol/formaldehyde ratio and the dilution ratio were fixed at 0.5 and 5.7 respectively.…”

“…Globally, the microstructure of these materials becomes denser throughout both series. The bulk density, ρ b , skeletal density, ρ s , and specific surface area, S BET , of these samples are reported in Table 1, and were already published elsewhere [9,10]. The specific volume is estimated as V p = 1/ρ b , and the volume density as φ = ρ b /ρ s .…”

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

“…Furthermore, the chemical activation via wet impregnation allows the combination of high surface areas and the preservation (even higher development) of the mesoporosity created during the synthesis of the resin. The effect of the impregnation In this context, the synthesis of carbon gels is an interesting approach for the preparation of highly porous materials with controlled properties due to their relatively lowcost and unique physical, chemical and electrochemical properties (Al-Muhtaseb and Ritter 2003;Elkhatat and AlMuhtaseb 2011;Job et al 2004;Fellinger et al 2012). The synthesis of carbon gels is typically based on the sol-gel polycondensation of resorcinol and formaldehyde (RF) mixtures in the presence of a catalyst (Pekala 1989).…”

The influence of thermal treatment on the electrochemical properties of carbon–Ni–Pd composites

“…Carbon gels are formed during the pyrolysis of RF aerogels. The structure and properties of carbon gels depend on the polymerization conditions [9][10][11][12] and the ratio of the substrates R/C [13,14].…”

“…Different metal-doped carbon gels have already been prepared and characterized, including Ce and Zr-containing carbon gels [27], Cu- [17,29,30], Ni- [10,19,[29][30][31][32], Ag- [33], Pd- [3,[22][23][24][25][26], Co- [16,23], Mn- [16], Ti- [16], Fe- [3,23,28] or Pt- [22,26] doped carbon gels.…”