Controlled growth of a 2D/2D heterojunction for high-performance sodium ion storage†
*a
and
Yuliang
Li
*ab
Abstract
We propose a van der Waals epitaxial growth method and successfully construct a 2D/2D heterostructure based on graphdiyne (GDY) and Ti2C3Tx. In our preparation process, the insertion of monomers and subsequent cross-coupling reactions guarantee the successive and conformal growth of GDY on the Ti2C3Tx nanosheets, resulting in the production of large-scale 2D/2D heterojunctions. This new heterojunction highlights the structural advantages and effectively prevents the planar restacking of the Ti2C3Tx nanosheets. It also provides numerous accessible channels and active spots for rapid ion transportation and Na+ storage. Electrochemical tests demonstrate that these enriched heterojunctions significantly enhance the kinetic behavior for storing the Na+, resulting in a six-fold increase in the specific capacity. Our results show that the controllable growth of GDY has significant advantages in the preparation and assembly of 2D/2D heterojunctions. These heterojunctions have great potential in the field of electrochemical energy storage.
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