A binder-free electrode based on Ti3C2Tx-rGO aerogel for supercapacitors

Flexible Ti3C2Tx/Graphene Films with Large‐Sized Flakes for Supercapacitors

“…[22,23] Table S1, Supporting Information, shows that pure Ti 3 C 2 T x has a high conductivity, which decreases slightly after introduction of graphene, but it is also significantly higher than Ti 3 C 2 T x / RGO as reported in the literatures. [21][22][23] Figure 2g shows that pure Ti 3 C 2 T x film surfaces exhibit a hydrophilic contact angle of about 35 , consistent with the literature. [3] After 15 s of contact between the droplets with the Ti 3 C 2 T x film, the contact angle quickly decreases to 23 , and the film surface is almost completely wet, indicating that the pure Ti 3 C 2 T x film has poor water resistance.…”

“…The complete XRD patterns from 5 to 45 are shown in Figure S8, Supporting Information. Unlike the reported literatures, [21,23] there was no noticeable movement toward a small angle. Combined with SEM cross-sectional analysis, we believe that flexible wrinkled graphene can reduce the self-stacking of Ti 3 C 2 T x at a macrolevel (relative layer-by-layer self-assembly: 1-2 nm scale), which is mainly due to its free dispersion in the interlayer of Ti 3 C 2 T x , rather than the microscopic layerby-layer self-assembly.…”

“…It is clearly superior to Ti 3 C 2 T x /RGObased symmetric supercapacitors of the same type previously reported, such as, Ti 3 C 2 T x /RGO film (10.5 Wh kg À1 ), [23] Ti 3 C 2 T x /holey RGO film (11.5 Wh kg À1 ), [22] and Ti 3 C 2 T x /RGO film (7.5 Wh kg À1 ). [21] The M/G-10-based symmetric supercapacitor exhibits excellent cyclic stability with retention of %110% after 10 000 cycles at a current density of 5 A g À1 and coulombic efficiency that remains near 100% (Figure 6d). Meanwhile, pure Ti 3 C 2 T x -based symmetric supercapacitors also exhibit outstanding cyclic stability and coulombic efficiency (Figure S14, Supporting Information).…”

“…As shown in Figure 5c, it should be noted that the surface capacitance of M/G-10 electrode was significantly higher (72.7%) than that of pure Ti 3 C 2 T x (45.5%, Figure S11c, Supporting Information), which was different from the reported study. [21] We hypothesized that the main reason for this phenomenon is that the addition of graphene increases the material's macroscopic specific surface area, promotes exposure to more active sites, and increases the ion-accessible surface area. Similarly, it is speculated that one of the reasons for the phenomenon of pure Ti 3 C 2 T x having less surface capacitance may be that large-sized flakes have smaller specific surface area and fewer edge active sites than smaller Ti 3 C 2 T x flakes.…”

“…Because of the robust Van der Waals interaction in the drying and synthesis processes, [16] the self-restacking phenomenon has been proved to significantly reduce ion mobility, which is not conducive to fast chargeÀdischarge of devices under high current density. To improve the problem, various materials such as nano-Ag particles, [17] conductive polymer PEDOT: PSS, [18] carbon nanotubes (CNTs), [19] and reduced graphene oxide (RGO) [20][21][22] were introduced into Ti 3 C 2 T x to prepare composite self-supporting films by vacuum filtration. Ti 3 C 2 T x -RGO hybrid materials have been reported in some literatures.…”