Low-Temperature Synthesis of Monolithic Titanium Carbide/Carbon Composite Aerogel

Abstract

Resorcinol-formaldehyde/titanium dioxide composite (RF/TiO2) gel was prepared simultaneously by acid catalysis and then dried to aerogel with supercritical fluid CO2. The carbon/titanium dioxide aerogel was obtained by carbonization and then converted to nanoporous titanium carbide/carbon composite aerogel via 800 °C magnesiothermic catalysis. Meanwhile, the evolution of the samples in different stages was characterized by X-ray diffraction (XRD), an energy-dispersive X-ray (EDX) spectrometer, a scanning electron microscope (SEM), a transmission electron microscope (TEM) and specific surface area analysis (BET). The results showed that the final product was nanoporous TiC/C composite aerogel with a low apparent density of 339.5 mg/cm3 and a high specific surface area of 459.5 m2/g. Comparing to C aerogel, it could also be considered as one type of highly potential material with efficient photothermal conversion. The idea of converting oxide–carbon composite into titanium carbide via the confining template and low-temperature magnesiothermic catalysis may provide new sight to the synthesis of novel nanoscale carbide materials.

Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

“…There are few reports on other carbides aerogels. But titanium carbide composite aerogels have recently been reported by Du et al [157] The nanoporous TiC/C composite aerogels with apparent density of 339.5 mg/cm 3 and specific surface area of 459.5 m 2 /g were prepared through acid catalysis. The preparation reaction temperature of the aerogels was lower than 800 ℃, and the aerogels had good photothermal conversion ability.…”

Ag-Incorporated Cr-Doped BaTiO3 Aerogel toward Enhanced Photocatalytic Degradation of Methyl Orange

“…The conventional synthesis process for aerogels involves five steps: sol-gel, solution displacement, aging, supercritical drying, and heat treatment [10]. This proposed approach can be applied to binary oxide aerogels like SiO 2 , TiO 2 , Al 2 O 3 , etc., which maintain a continuous three-dimensional network structure even after undergoing high-temperature calcination [22][23][24]. However, synthesizing ternary oxide aerogels like BaTiO 3 using this approach is challenging.…”