Novel synthesis of ZIF67 derived cobalt and nickel oxides induced by ammonium tetrafluoroborate as electroactive material of battery supercapacitor hybrids

Tsung Rong Kuo, Hanny Tika Draviana, Chia Shuo Hsu, Ren Jei Chung, Min Wen Chen, Su Ching Wang, Pin Yan Lee, Sibidou Yougbaré, Lu Yin Lin, Yung Fu Wu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Cobalt and nickel oxides with large theoretical capacitance, high redox activity and low-cost features are widely applied as electroactive material of battery supercapacitor hybrids (BSH) to reduce energy consumption and create renewable energy. Synthesizing cobalt and nickel oxides using zeolitic imidazolate framework 67 (ZIF67) can enhance conductivity and electroactivity and maintain surface area and porosity of ZIF67. Structure directing agent (SDA) can control morphology and improve electrochemical performance. It is attractive to apply SDA for controlling morphology of oxidized ZIF67 and achieving excellent energy storage. In this work, ammonium tetrafluoroborate (NH4BF4) is firstly applied as SDA to synthesize ZIF67 derivative, which is then annealed to form leaf-like cobalt and nickel oxides as electroactive material. The optimal oxidized ZIF67 derivative shows a larger specific capacitance (CF) of 828.9 F/g than those of 519.9 and 5.0 F/g respectively for the oxidized ZIF67 and pristine ZIF67 electrodes, due to preferable leaf-like structure and (311) facet for the former case. A BSH with oxidized ZIF67 derivative positive electrode and graphene negative electrode shows maximum energy density of 10.2 Wh/kg at 357 W/kg, and CF retention of 91% and Coulombic efficiency of 97% after 10,000 cycles. The novel SDA of NH4BF4 is expected to design other efficient electroactive materials for effective energy storage.

Original languageEnglish
Article number107831
JournalJournal of Energy Storage
Volume68
DOIs
Publication statusPublished - Sept 15 2023

Keywords

  • Ammonium tetrafluoroborate
  • Battery supercapacitor hybrid
  • Coulombic efficiency
  • Metal–organic framework
  • Oxidation
  • ZIF67

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Novel synthesis of ZIF67 derived cobalt and nickel oxides induced by ammonium tetrafluoroborate as electroactive material of battery supercapacitor hybrids'. Together they form a unique fingerprint.

Cite this