Bioinspired Hierarchically Structured All-Inorganic Nanocomposites with Significantly Improved Capacitive Performance

Qibin Yuan, Fang Zhou Yao, Shao Dong Cheng, Linxi Wang, Yifei Wang, Shao Bo Mi, Qing Wang, Xiaohui Wang, Hong Wang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Lead-free dielectric ceramics have been the spotlight in the search for environmentally benign materials for electrostatic energy storage because of the ever-increasing environmental concerns. However, the inverse correlation between the polarization and dielectric breakdown strength is the major barrier hindering the provision of sufficient energy densities in lead-free dielectric ceramics and practical applications thereof. Herein, a rational structure design inspired by nature is demonstrated as an effective strategy to overcome these challenges. Bioinspired raspberry-like hierarchically structured all-inorganic nanocomposites have been prepared by enclosing microsized BaTiO3-Bi(Mg0.5Zr0.5)O3 (BT-BMZ) relaxor ferroelectrics using core-shell BT-BMZ@SiO2 nanoparticles. The synergistic effects of the bioinspired hierarchical structure and insulating SiO2 nano-coating result in significantly improved dielectric breakdown strength and sustained large polarization in the nanocomposites, as corroborated by experimental characterizations and theoretical simulations. As a result, an ultrahigh energy density of 3.41 J cm−3 and a high efficiency of 85.1%, together with outstanding thermal stability within a broad temperature range, have been simultaneously achieved in the hierarchically structured nanocomposites. This contribution provides a feasible and paradigmatic approach to develop high-performance dielectrics for electrostatic energy storage applications using bioinspired structure design.

Original languageEnglish (US)
Article number2000191
JournalAdvanced Functional Materials
Volume30
Issue number23
DOIs
StatePublished - Jun 1 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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