Heterostructures Assembled from Bi2O2CO3 and MXene for Boosted Potassium-Ion Storage by Arousing the Built-in Electric Field

Song Chen; Heping Ma; Yibo Du; Miao Tian; Zhitao Wang; Shuang Fan; Wenming Zhang; Hui Ying Yang

doi:10.1002/smll.202401314

Heterostructures Assembled from Bi₂O₂CO₃ and MXene for Boosted Potassium-Ion Storage by Arousing the Built-in Electric Field

Small. 2024 Apr 22:e2401314. doi: 10.1002/smll.202401314. Online ahead of print.

Authors

Song Chen¹, Heping Ma¹, Yibo Du¹, Miao Tian², Zhitao Wang³, Shuang Fan⁴, Wenming Zhang¹, Hui Ying Yang⁵

Affiliations

¹ Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, China.
² Hebei Key Laboratory of Optic-Electronic Information Materials, College of Physics Science and Technology, Hebei University, Baoding, 071002, China.
³ Henan Engineering Research Center of Design and Recycle for Advanced Electrochemical Energy Storage Material, School of Materials Science and Engineering, Henan Normal University, Xinxiang, 453007, China.
⁴ College of Chemistry and Environmental Engineering, International Joint Research Center for Molecular Science, Shenzhen University, Shenzhen, 518060, China.
⁵ Pillar of Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore.

PMID: 38644698
DOI: 10.1002/smll.202401314

Abstract

Bismuth-based materials have been recognized as the appealing anodes for potassium-ion batteries (PIBs) due to their high theoretical capacity. However, the kinetics sluggishness and capacity decline induced by the structure distortion predominately retard their further development. Here, a heterostructure of polyaniline intercalated Bi₂O₂CO₃/MXene (BOC-PA/MXene) hybrids is reported via simple self-assembly strategy. The ingenious design of heterointerface-rich architecture motivates significantly the interior self-built-in electric field (IEF) and high-density electron flow, thus accelerating the charge transfer and boosting ion diffusion. As a result, the hybrids realize a high reversible specific capacity, satisfying rate capability as well as long-term cycling stability. The in/ex situ characterizations further elucidate the stepwise intercalation-conversion-alloying reaction mechanism of BOC-PA/MXene. More encouragingly, the full cell investigation further highlights its competitive merits for practical application in further PIBs. The present work not only opens the way to the design of other electrodes with an appropriate working mechanism but also offers inspiration for built-in electric-field engineering toward high-performance energy storage devices.

Keywords: MXene; built‐in electric field; heterostructures; potassium‐ion storage.

Abstract

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