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K 2 Ti 4 O 9 Nanoribbon Arrays Functionalized with Graphene Quantum Dots for Superior Pseudocapacitive Sodium Storage
Author(s) -
Cao Minglei,
Shi Zhixiang,
Chen Wei,
Li Xingxing,
Ma Yanan,
Zhang Chuankun
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100856
Subject(s) - materials science , graphene , anode , surface modification , quantum dot , nanotechnology , electrochemistry , ion , graphene quantum dot , chemical engineering , electrode , chemistry , organic chemistry , engineering
Sodium‐ion batteries offer a promising solution for large‐scale energy storage. However, development of suitable anode materials with long cycle life and high‐rate capability is a major challenge. Herein, we report K 2 Ti 4 O 9 nanoribbon arrays as efficient anode materials for sodium‐ion batteries for the first‐time. The cross‐linked nanoribbon array configuration of K 2 Ti 4 O 9 enables excellent structural stability and directional ion and electron transport pathways. More importantly, a surface functionalization with graphene quantum dots could significantly improve the electron and ion transport properties and electrochemical surface reactivity of the K 2 Ti 4 O 9 nanoribbon arrays, thus achieving superior pseudocapacitive sodium storage. As a consequence, the graphene quantum dots functionalized K 2 Ti 4 O 9 nanoribbon arrays deliver high reversible capacity of 156.8 mAh g −1 at a current density of 0.2 A g −1 and remarkable rate capability of 62.8 mAh g −1 at 5.0 A g −1 , as well as excellent cyclability (approximately 95.9 % capacity retention efficiency over 5,000 continuous cycles at 2.0 A g −1 ). This work demonstrated the potential significance of surface functionalization strategy for boosting the pseudocapacitive sodium storage properties of titanium‐based anode materials.