Nacre-like mechanically robust heterojunction for lithium-ion extraction

Weiwen Xin, Chao Lin, Lin Fu, Xiang Yu Kong, Linsen Yang, Yongchao Qian, Congcong Zhu, Qianfan Zhang, Lei Jiang, Liping Wen

Research output: Contribution to journalArticleResearchpeer-review

40 Citations (Scopus)

Abstract

Nanolaminate membranes composed of two-dimensional materials are promising candidates for molecular sieving via size-limited diffusion and charge effect in nanoconfinement, but these materials suffer from weak mechanical properties and instability in water due to the hydrophilicity. Here, inspired by natural nacre structure, we design an ion-gating heterojunction with opposite charges and asymmetrical nanochannels. Nanofibers and nanosheets form a typical brick-and-mortar structure, which exhibits mechanical robustness compared with other reported materials. Additionally, the heterostructure contributes to both restraining concentration polarization and generating spontaneous potential gradient. Thus, based on the confined dehydration and charge-exclusion effects, we reveal the ordered transport rank Li+ > Na+ > K+ > Mg2+ > Ca2+, which depends on the valence and radius of ions. Ionic gating achieves the extraction of lithium ions with the Li+/Na+ and Li+/K+ selectivity of 2.52 and 4.78. This membrane may have applications in lithium-ion batteries and designs of ion-separation membranes.

Original languageEnglish
Pages (from-to)737-754
Number of pages19
JournalMatter
Volume4
Issue number2
DOIs
Publication statusPublished - 3 Feb 2021
Externally publishedYes

Keywords

  • bioinspired nacre-like membrane
  • heterojunction
  • ion transport
  • lithium-ion extraction
  • MAP5: Improvement
  • two-dimension materials

Cite this