Qiu-Feng Lü

Amino functionalized Ti ₃ C ₂ T _x was successfully prepared by modifying the intercalated Ti ₃ C ₂ T _x surface with N -[3-(trimethoxysilyl)propyl] ethylenediamine, enriching the application of Ti ₃ C ₂ T _x in oil/water separation and dye removal.

A dahlia‐liked carbon nanohorns (CNHs) decorated graphene/polyaniline (CGP) nanocomposite was prepared via in situ chemical oxidation and hydrazine hydrate reducing. Firstly, dahlia‐liked CNHs decorated graphene oxide/polyaniline (CGOP) composite was synthesized from the polymerization of aniline monomers on the surface of graphene oxide with spherical dahlia‐liked carbon nanohorns as spacers. Then, the CGP composite was obtained by reducing CGOP using hydrazine hydrate. CGP exhibited a uniform three‐dimensional nanostructure because long cone‐shaped tips of dahlia‐liked CNHs spacers can boost the isolation effect of the nanocomposite. The maximum specific capacitance of CGP was up to 769 F g ⁻¹ at a current density of 1 A g ⁻¹ when served as supercapacitors electrodes. Importantly, CGP also performed a good rate capability and high stability. Furthermore, a CGP‐based asymmetric supercapacitor was assembled and delivered an energy density of 19.1 Wh kg ⁻¹ at a power density of 1504.9 W kg ⁻¹ .

The development of high capacitance, high rate capability, and stability compounded electrochemical energy storage devices is an important factor that is required to meet the challenge of energy depletion. In this work, a novel graphene‐decorated 2D Ti₃C₂T_X/polyaniline (GTP) nanocomposite was successfully fabricated by means of in situ oxidation copolymerization of aniline monomers on the surface of Ti₃C₂T_X nanosheets with the decoration of small‐sized chemical‐vapor‐deposited graphene nanosheets. The GTP nanocomposite shows promoted pseudocapacitive when used as a supercapacitor electrode, because the small‐sized graphene can effectively prevent aggregation of the Ti₃C₂T_X monolayers and facilitate the uniform growth of polyaniline on the layered structural Ti₃C₂T_X. Furthermore, the small‐sized graphene provides more ion/electrons transfer pathways, which acts like “conductive bridges” between the electrodes and the electrolyte. After assembling an asymmetric supercapacitor (ASC) device using GTP as the positive electrode and Ti₃C₂T_X as the negative electrode, the device can operate in a voltage window up to 1.5 V in 1 M H₂SO₄. Most importantly, the GTP//Ti₃C₂T_X ASC shows an outstanding electrochemical performance compared to the reported Ti₃C₂T_X‐based devices.