Topological Insulator Bi₂Se₃‐Assisted Heterostructure for Ultrafast Charging Sodium‐Ion Batteries

Abstract

The development of fast charging materials offers a viable solution for large‐scale and sustainable energy storage needs. However, it remains a critical challenge to improve the electrical and ionic conductivity for better performance. Topological insulator (TI), a topological quantum material that has attracted worldwide attention, hosts unusual metallic surface states and consequent high carrier mobility. Nevertheless, its potential in promising high‐rate charging capability has not been fully realized and explored. Herein, a novel Bi2Se3‐ZnSe heterostructure as excellent fast charging material for Na+ storage is reported. Ultrathin Bi2Se3 nanoplates with rich TI metallic surfaces are introduced as an electronic platform inside the material, which greatly reduces the charge transfer resistance and improves the overall electrical conductivity. Meanwhile, the abundant crystalline interfaces between these two selenides promote Na+ migration and provide additional active sites as well. As expected, the composite delivers the excellent high‐rate performance of 360.5 mAh g−1 at 20 A g−1 and maintains its electrochemical stability of 318.4 mAh g−1 after 3000 long cycles, which is the record high for all reported selenide‐based anodes. This work is anticipated to provide alternative strategies for further exploration of topological insulators and advanced heterostructures.

A heterojunction composite of Bi2Se3 nanosheets and MoO3 nanobelts for a high-performance triethylamine sensor

“…The results of these peak shifting directly showed the formation of heterogeneous structures in the Bi 2 Se 3 /MoO 3 -2 composite. 33…”

“…8b, and the R ct of Bi 2 Se 3 /MoO 3 -2 (0.29 Ω) is found to be smaller than that of MoO 3 (1.2 Ω), indicating that the heterojunction structure enhances the charge transport characteristic. 33 In addition, the Mott–Schottky technique is a way of measuring electron carrier density and judging the type of semiconductor. As shown in Fig.…”

Amorphous/crystalline heterostructure design enables highly efficient adsorption–diffusion–conversion of polysulfides for lithium–sulfur batteries

“…Bismuth selenide (Bi 2 Se 3 ), a topological insulator with a low bandgap of 0.3 eV and high electrical conductivity, has been demonstrated as an advanced electrode material for electrochemical energy storage. [41][42][43] Recently, Bi 2 Se 3 was also reported to be an efficient catalyst for Li-S batteries. 44,45 However, Bi 2 Se 3 suffered from weak affinity toward LiPSs.…”