TiO₂–B Nanosheets/Anatase Nanocrystals Co‐Anchored on Nanoporous Graphene: In Situ Reduction–Hydrolysis Synthesis and Their Superior Rate Performance as an Anode Material

Abstract

A unique hybrid, TiO2-B nanosheets/anatase nanocrystals co-anchored on nanoporous graphene sheets, can be synthesized by a facile microwave-induced in situ reduction-hydrolysis route. The as-formed nanohybrid has a hierarchically porous structure, involving both mesopores of approximately 4 nm and meso-/macropores of 30-60 nm in the graphene sheets, and a large surface area. Importantly, electrodes composed of the nanohybrid exhibit superior rate capability (160 mA h g(-1) at ca. 36 C; 154 mA h g(-1) at ca. 72 C) and excellent cyclability. The synergistic effects of conductive graphene with numerous nanopores and the pseudocapacitive effect of ultrafine TiO2-B nanosheets and anatase nanocrystals endow the hybrid a superior rate capability.

Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

“…65-5714), respectively. Anatase TiO 2 may originate from the partial transformation of metastable TiO 2 -B under heating treatment [35][36][37][38] . Refinement results quantify a mass percentage of ca.…”

Carbon-coated rutile titanium dioxide derived from titanium-metal organic framework with enhanced sodium storage behavior

“…Nevertheless, the pristine TiO 2 (B) showed relatively poor sodium storage performances with a rather low specific capacity about 80 mAh g À1 at a specific current of 50 mA g À1 and a specific capacity about 35 mAh g À1 at 400 mA g À1 , which could be attributed to its lower ion diffusion coefficients and worse electronic conductivity (~10 À12 S cm À1 ) [33]. It is found that the inferior electrochemical storage performance for SIBs of pristine TiO 2 is difficult to meet the requirement of practical energy storages [34]. In order to better use its advantages, lots of efforts have been taken to increase its electronic conductivity and avoid the agglomeration of TiO 2 nanoparticles.…”

A Direct Hybridization between Isocharged Nanosheets of Layered Metal Oxide and Graphene through a Surface‐Modification Assembly Process

“…[19][20][21][22][23] The enhancement of electrical conductivity and the formation of porous stacking structures upon the hybridization with rGO nanosheets lead to the improvement of their electrode performance at high current density and the accommodation of large volume change during electrochemical cycling. [24][25][26] However, it is not easy to directly hybridize the negatively charged nanosheets of layered metal oxides with isocharged rGO nanosheets due to electrostatic interactions. To overcome this difficulty, it is desirable to modify the negative charge of rGO nanosheets to a positive charge.…”