Controllable synthesis of borophene aerogels by utilizing h-BN layers for high-performance next-generation batteries


Çiftçi N. O., Sentürk S. B., Sezen Y., Kaykusuz S. Ü., Long H., Ergen O.

Proceedings of the National Academy of Sciences of the United States of America, vol.120, no.42, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 120 Issue: 42
  • Publication Date: 2023
  • Doi Number: 10.1073/pnas.2307537120
  • Journal Name: Proceedings of the National Academy of Sciences of the United States of America
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Agricultural & Environmental Science Database, Animal Behavior Abstracts, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, CAB Abstracts, Chemical Abstracts Core, EconLit, Food Science & Technology Abstracts, INSPEC, Linguistic Bibliography, MathSciNet, Pollution Abstracts, Psycinfo, Public Affairs Index, Veterinary Science Database, zbMATH, DIALNET
  • Keywords: aerogels, borophene, next-generation batteries, sodium, sulfur
  • Istanbul Technical University Affiliated: Yes

Abstract

Borophene is emerging as a promising electrode material for Li, Na, Mg, and Ca ion batteries due to its anisotropic Dirac properties, high charge capacity, and low energy barrier for ion diffusion. However, practical synthesis of active and stable borophene remains challenging in producing electrochemical devices. Here, we introduce a method for borophene aerogels (BoAs), utilizing hexagonal boron nitride aerogels. Borophene grows between h-BN layers utilizing boron-boron bridges, as a nucleation site, where borophene forms monolayers mixed with sp2-sp3 hybridization. This versatile method produces stable BoAs and is compatible with various battery chemistries. With these BoAs, we accomplish an important milestone to successfully fabricate high-performance next-generation batteries, including Na-ion (478 mAh g-1, at 0.5C, >300 cycles), Mg-ion (297 mAh g-1, at 0.5C,>300 cycles), and Ca-ion (332 mAh g-1, at 0.5C, >400 cycles), and Li-S batteries, with one of the highest capacities to date (1,559 mAh g-1, at 0.3C, >1,000 cycles).