Interface‐Induced Self‐Assembly Strategy Toward 2D Ordered Mesoporous Carbon/MXene Heterostructures for High‐Performance Supercapacitors

Abstract

Two‐dimensional transition metal carbonitrides (MXene) have demonstrated great potential in many fields. However, the serious aggregation and poor thermodynamic stability of MXene greatly hinder their applications. Here, an interface‐induced self‐assembly strategy to synthesize ordered mesoporous carbon/Ti3C2Tx heterostructures (OMCTs) was developed. In this method, the composite monomicelles formed by Pluronic F127 and low‐molecular‐weight phenolic resol self‐assembled on the surface of Ti3C2Tx to prevent the restacking of Ti3C2Tx and maintain its thermostability. The obtained OMCTs possessed high specific surface areas (259–544 m2 g−1), large pore volumes (0.296–0.481 cm3 g−1), and excellent thermodynamic stability (up to 600 °C). Benefiting from these advantages, OMCTs serving as the electrode materials for supercapacitor exhibited superior supercapacitor performances, including high capacitance of 247 F g−1 at 0.2 A g−1, satisfactory rate performance of 190 F g−1 at 5 A g−1, and cyclability.

Pyridinic Nitrogen Sites Dominated Coordinative Engineering of Subnanometric Pd Clusters for Efficient Alkynes’ Semihydrogenation

“…[ 36,37 ] When the relative pressure P / P 0 is between 0.4 and 0.85, the capillary condensation process presents a steep and sharp ladder, implying the existence of plentiful mesopores in the samples framework. [ 38–46 ] The pore size distribution curves were calculated by analyzing the adsorption branch employing the Barrett–Joyner–Halenda (BJH) model, indicating that the mesopore peaking is mainly concentrated at 7.1–7.8 nm, which are in good agreement with the TEM results. Textural parameters of all the samples are listed in Table S1 (Supporting Information).…”

Sandwich-like Na2Ti3O7 Nanosheet/Ti3C2 MXene Composite for High-Performance Lithium/Sodium-Ion Batteries

“…After this high-rate measurement, the capacity of NTO@MXene could be recovered to 353 mAh g –1 when the current density returned to 0.1 A g –1 , while the capacities of MXene and NTO were only kept at 123 and 83 mAh g –1 , respectively. Even the NTO@MXene electrode also demonstrated a good long-term reversible capacity of 158 mAh g –1 at 4 A g –1 over 1200 cycles following activation with a 0.1 A g –1 current density for the first 10 cycles (Figure c). ,, According to our knowledge, the electrochemical properties of NTO@MXene were superior to those of most reported previously for titanium oxide-based composites (Table S1). Furthermore, we also prepared a binder-free flexible NTO@MXene@GF electrode by growth of NTO@MXene on a 3D flexible graphene framework (Figure S4a,b).…”

Ordered Mesoporous Carbon Grafted MXene Catalytic Heterostructure as Li-Ion Kinetic Pump toward High-Efficient Sulfur/Sulfide Conversions for Li–S Battery

“…The OMC-g-MXene heterostructure were synthesized similar to previously reported work. 61 First, 0.06 g of sodium hydroxide was dissolved in 15 mL of deionized water, then 0.6 g of phenol and 2.1 mL of formaldehyde (37%) were added and stirred continuously for 30 min to obtain a clear solution at 70 °C. Next, 65 mL of aqueous dissolved 0.96 g of Polyether-F127 was added with continuous stirring to obtain the F127/resol composites monomicelles solution (FR solution).…”

“…The OMC- g -MXene heterostructure were synthesized similar to previously reported work . First, 0.06 g of sodium hydroxide was dissolved in 15 mL of deionized water, then 0.6 g of phenol and 2.1 mL of formaldehyde (37%) were added and stirred continuously for 30 min to obtain a clear solution at 70 °C.…”