Novel insights of structure evolution between ZIF and hydroxide via controlled doses of ammonium bifluoride and applications on battery supercapacitor hybrids

Tsai Mu Cheng, Su Ching Wang, Pin Yan Lee, Chia Shuo Hsu, Mei Wei Chen, Sibidou Yougbaré, Hsiao Chien Chen, Chutima Kongvarhodom, Lu Yin Lin, Yung Fu Wu

研究成果: 雜誌貢獻文章同行評審

13 引文 斯高帕斯(Scopus)

摘要

Metal organic framework is often post-treated to increase electrical conductivity and electroactivity for application on battery supercapacitor hybrids (BSH). An in-situ modification is previously proposed to replace post-treatments via incorporating ammonium fluoride (NH4F) during synthesizing zeolitic imidazolate framework-67 (ZIF67) to develop derivatives with excellent energy storage ability. Inspired by structure directing ability of ammonium group, high electronegativity of fluorine-based group, and time and money-saving process of in-situ modification, a novel structure directing agent (SDA), ammonium bifluoride (NH4HF2), is proposed in this study to design ZIF67 derivatives via the facile one-step solution process for the first time. The amounts of NH4HF2 and 2-methylimidazole are varied to fabricate a series of ZIF67 derivatives, and the SDA effects on physical and electrochemical properties are investigated. The highest specific capacitance (CF) of 1116.7 F/g and the capacity of 217.1 mAh/g are achieved for the optimal ZIF67 derivative at 20 mV/s, because of the thinnest layers with large surface area and abundant electrolyte contacts. The ZIF67 derivative and carbon electrodes are applied to fabricate a BSH, which displays a CF retention of 84.8% and Coulombic efficiency of 96.1% after measuring the charge/discharge curves at 1.0 A/g for 10,000 cycles, as well as the maximum energy density of 7.3 Wh/kg at the power density of 714.3 W/kg.
原文英語
文章編號107709
期刊Journal of Energy Storage
68
DOIs
出版狀態已發佈 - 9月 15 2023

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 能源工程與電力技術
  • 電氣與電子工程

指紋

深入研究「Novel insights of structure evolution between ZIF and hydroxide via controlled doses of ammonium bifluoride and applications on battery supercapacitor hybrids」主題。共同形成了獨特的指紋。

引用此