Direct growth of NiO nanosheets on mesoporous TiN film for energy storage devices

Jae Hun Lee, Jung Yup Lim, Chang Soo Lee, Jung Tae Park, Jong Hak Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We report an efficient energy storage electrode based on well-defined, interconnected NiO nanosheets (NiO-NS) grown directly on a mesoporous TiN (meso-TiN) film via a solvothermal method. A mesoporous TiO 2 (meso-TiO 2 ) film is prepared using a graft copolymer template and then thermally annealed in ammonia at 800 °C to convert meso-TiO 2 into meso-TiN. The ultrathin interconnected NiO-NS provide a large surface area and effective electron pathway, which enhance their specific capacitance and electrochemical properties. In contrast, a less-organized structure with poor homogeneity, low porosity and some cracks is formed for dense-TiN film prepared without the PVC-g-POEM. The meso-TiN film acts as an efficient conductive support to grow the NiO-NS and enhances the diffusion of electron/electrolyte ions. Despite its low thickness (<1.3 μm), the NiO-NS/meso-TiN supercapacitor exhibits a high capacitance of 104 mF cm −2 and good cycle stability (86% capacitance retention) owing to the synergetic effects of the NiO-NS and meso-TiN heteronanostructure. The NiO-NS/meso-TiN film is also applied to a flexible substrate and exhibits no cracks after bending; thus, our work provides an efficient way to design flexible energy storage devices using graft-copolymer-directed heteronanostructures.

Original languageEnglish
Pages (from-to)849-857
Number of pages9
JournalApplied Surface Science
Volume420
DOIs
Publication statusPublished - 2017 Oct 31

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Direct growth of NiO nanosheets on mesoporous TiN film for energy storage devices'. Together they form a unique fingerprint.

  • Cite this