Two-Dimensional Layered Ultrathin Carbon/TiO₂ Nanosheet Composites for Superior Pseudocapacitive Lithium Storage

Abstract

Intercalation of carbon nanosheets into two-dimensional (2D) inorganic materials could enhance their properties in terms of mechanics and electrochemistry, but sandwiching these two kinds of materials in an alternating sequence is a great challenge in synthesis. Herein, we report a novel strategy to construct TiO 2 nanosheets into 2D pillar-layer architectures by employing benzidine molecular assembly as pillars. Then, 2D carbon/TiO 2 nanosheet composite with a periodic interlayer distance of 1.1 nm was obtained following a polymerization and carbonization process. This method not only alleviates the strain arising from the torsion of binding during carbonization but also hinders the structural collapse of TiO 2 due to the intercalation of the carbon layer by rational control of annealing conditions. The composite material possesses a large carbon/TiO 2 interface, providing abundant active sites for ultrafast pseudocapacitive charge storage, thus displaying a superior high-rate performance with a specific capacity of 67.8 mAh g −1 at a current density of 12.8 A g −1 based on the total electrode and excellent cyclability with 87.4% capacity retention after 3000 cycles.

Synthesis of Highly-Ordered Two-Dimensional Hierarchically Porous Carbon Nanosheet Stacks as Advanced Electrode Materials for Lithium-Ion Storage

“…The mesopore nature for C NS -900 presumably originates from the etching of the sintering bulk rutile phase and anatase phase of TiO 2 particles in the layered composite. 23 which thus may also produce affluent pseudo-faradic capacitance for the C NS stacks. 34 Generally, excellent rate capability is necessary for lithiumion batteries with both high-energy and high-power delivery.…”

Rapid Electrochemical Activation of V2O3@C Cathode for High‐Performance Zinc‐Ion Batteries in Water‐in‐Salt Electrolyte

“…% by energy dispersive X-Ray spectroscopy (EDS) test (Table S1). Inspired by our previous works, [39][40][41] p-phenylenediamine can be polymerized to form macromolecular poly-p-phenylenediamine under the oxygen atmosphere at a suitable temperature, and the graphene layer with a high conductivity can be formed after a further high-temperature carbonization treatment. Benefiting from this work, a series of carbon/TiO 2 composite have been prepared as an anode for LIBs with excellent electrochemical performances.…”

Interlayer Chemistry of Layered Electrode Materials in Energy Storage Devices

“…reported the construction of layered TiO 2 nanosheet composites containing benzidine interlayer pillars. [ 60 ] The self‐assembly of benzidine and the post‐carbonization process produced 2D layer‐by‐layer C/TiO 2 nanosheets with an interlayer spacing of 1.1 nm. The 2D composite possesses large interfaces and numerous active sites, exhibiting a high rate performance of 12.8 A g −1 and a stable capacity retention of 87.4% over 3000 cycles when used as a LIB anode.…”