Developing zeolitic imidazolate frameworks 67-derived fluorides using 2-methylimidazole and ammonia fluoride for energy storage and electrocatalysis

Pin-Yan Lee and Lu-Yin Lin

Energy, 2022, vol. 239, issue PB

Abstract: Zeolitic imidazolate framework 67 (ZIF67) with large surface area and tunable structure is one of the promising electroactive materials of electrochemical devices. In this study, NH4F and nickel salt are applied to synthesize bimetallic ZIF67-derived fluoride for supercapacitor (SC) and electrocatalytic water splitting at the first time. Nickel with multiple redox states enhances energy storage and catalytic ability. NH4F can confine crystalline growth and induce fluoride formation. Ratio of 2-methylimidazole to NH4F for synthesis is optimized regarding to surface area and electrical conductivity. The highest specific capacitance (CF) of 735.7 F/g at 20 mV/s is obtained for ZIF67-derived fluoride prepared using 2-methylimidazole to NH4F ratio of 2 to 1, due to smaller particle size and high electrical conductivity. The symmetric SC shows the maximum energy density of 24.6 Wh/kg at 0.6 kW/kg. The CF retention of 100 % and Coulombic efficiency higher than 96 % are obtained in 6000 times charge/discharge process. The ZIF67-derived fluoride and IrO2 composite is fabricated as electrocatalyst for water splitting. This composite shows a high current density of 0.11 A/cm2 at 1.6 VRHE and a small overpotential of 1.58 VRHE at 0.10 A/cm2. Current density retention of 100 % after continuous illumination for 600 min is also achieved.

Keywords: Ammonia fluoride; Electrocatalysis; Fluoride; Supercapacitor; ZIF67; 2-Methylimidazole (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S036054422102377X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:239:y:2022:i:pb:s036054422102377x

DOI: 10.1016/j.energy.2021.122129

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().