Preparation and methane adsorption of two-dimensional carbide Ti2C

Abstract

Here a novel material for methane adsorption was synthesized and studied, which is a graphene-like twodimensional (2D) carbide (Ti 2 C, a member of MXenes), formed by exfoliating Ti 2 AlC powders in a solution of lithium fluoride (LiF) and hydrochloric acid (HCl) at 40°C for 48 h. Based on first-principles calculation, theoretically perfect Ti 2 C with O termination has a specific surface area (SSA) of 671 m 2 g -1 and methane storage capacity is 22.9 wt%. Experimentally, 2.85 % exfoliated Ti 2 C with mesopores shown methane capacity of 11.58 cm 3 (STP: 0°C, 1 bar) g -1 (0.82 wt%) under 5 MPa and the SSA was 19.1 m 2 g -1 . For Ti 2 C sample intercalated with NH 3 ÁH 2 O, the adsorbed amount was increased to 16.81 cm 3 (STP) g -1 at same temperature. At the temperature of 323 K, the adsorbed amount of as-prepared Ti 2 C was increased to 52.76 cm 3 (STP) g -1 . For fully exfoliated Ti 2 C, the methane capacity was supposed to be 28.8 wt% or 1148 V (STP)v -1 . Ti 2 C theoretically has much larger volume methane capacity than current methane storage materials, though its SSA is not very high.

High-Voltage Symmetric Supercapacitor Based on 2D Titanium Carbide (MXene, Ti2CTx)/Carbon Nanosphere Composites in a Neutral Aqueous Electrolyte

“…This correlates with the formation of MXene, i.e. replacement of Al with = O, OH or F. 2,36,42,[52][53][54][55][56] TiC (JCPDS 01-089-3828) and TiO 2 (JCPDS 00-021-1272) can also be identified in the samples as also observed by others. 24,32 The other unknown peaks may be related to some MXene surface oxides arising from prolonged drying of MXene in air.…”

“…Although the MXene materials do not possess such a high surface area as electric double-layer capacitor (EDLC) materials, 6,11,24,35,36 they are suggested to employ the energy storage through pseudocapacitive ion intercalation route giving rise to high capacitance and attractive electrochemical properties without the need for a high surface area.…”

Electronic properties and applications of MXenes: a theoretical review

“…Experimentally, MXenes have already found applications as transparent conductors [18][19][20], field effect transistors [21], supercapacitors [22][23][24], Li ion batteries [25,26], electromagnetic interface shielders [27], fillers in polymeric composites [28], hybrid nanocompositites [29], purifiers [30,31], dual-responsive surfaces [32], suitable substrates for dyes [33], catalysts [34,35], promising materials for methane storage [36], and photocatalysts for hydrogen production [37], as well as being ceramic biomaterials with high photothermal conversion efficiency for cancer therapy [38]. Theoretically, many applications have been proposed for MXenes in electronic [39][40][41][42][43], magnetic [44][45][46][47][48], optical [49,50], thermoelectric [51][52][53][54][55][56], and sensing devices [57], as well as being new potential materials for catalytic and photocatalytic reactions [58][59][60]…”

Synthesis and oxidation resistance of V2AlC powders by molten salt method

“…Recently, by removing A elements from MAX phases, two‐dimensional carbides were be made, which have graphene‐like structure and named as MXenes . By now, there are around 30 MXenes .…”

“…Recently, by removing A elements from MAX phases, two-dimensional carbides were be made, 8,9 which have graphene-like structure and named as MXenes. [10][11][12][13][14][15] By now, there are around 30 MXenes. 8,[16][17][18][19][20] Among these MXenes, V 2 C made from V 2 AlC shows excellent properties.…”