Interfacial engineering of Bi2Te3/Sb2Te3 heterojunction enables high–energy cathode for aluminum batteries

Yiqun Du, Boya Zhang, Wenyang Zhang, Huixin Jin, Jingyu Qin, Jiaqi Wan*, Jianxin Zhang, Guowen Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Rechargeable aluminum batteries (RABs) have been regarded as a low-cost and safe candidate for electrochemical energy storage. However, the high charge density of Al3+ causes its sluggish diffusion and the large size of AlCl4 renders the capacity of the cathode low. Here we propose heterostructured Bi2Te3/Sb2Te3 nanoflakes by interfacial engineering, constructing a heterojunction that induces a built-in electric field among the interface between two phases to realize rapid charge transfer, fast ion diffusion, and high capacity of cathode. Note that the operational mechanisms of heterostructured Bi2Te3/Sb2Te3 cathode are based on the reversible intercalation/deintercalation of Al3+ ions with the redox process between Bi3+ and Bi5+ upon discharge and charge. As expected, the heterostructured Bi2Te3/Sb2Te3 nanoflakes deliver superb Al-storage property and rate capability, which is among the best comprehensive performances of cathodes in RABs.

Original languageEnglish
Pages (from-to)231-240
Number of pages10
JournalEnergy Storage Materials
Volume38
DOIs
Publication statusPublished - 2021 Jun
Externally publishedYes

Keywords

  • Aluminum batteries
  • Antimony telluride
  • Bismuth telluride
  • Cathode materials
  • Heterojunction

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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