Gram-Scale Synthesis of Bimetallic ZIFs and Their Thermal Conversion to Nanoporous Carbon Materials

Freddy Marpaung; Teahoon Park; Minjun Kim; Jin Woo Yi; Jianjian Lin; Jie Wang; Bing Ding; Hyunsoo Lim; Konstantin Konstantinov; Yusuke Yamauchi; Jongbeom Na; Jeonghun Kim

doi:10.3390/nano9121796

Gram-Scale Synthesis of Bimetallic ZIFs and Their Thermal Conversion to Nanoporous Carbon Materials

Nanomaterials (Basel). 2019 Dec 17;9(12):1796. doi: 10.3390/nano9121796.

Authors

Freddy Marpaung^{1

2}, Teahoon Park³, Minjun Kim⁴, Jin Woo Yi³, Jianjian Lin², Jie Wang⁵, Bing Ding⁵, Hyunsoo Lim⁴, Konstantin Konstantinov¹, Yusuke Yamauchi^{2

4

5}, Jongbeom Na^{2

4

5}, Jeonghun Kim^{2

6}

Affiliations

¹ Australian Institute for Innovative Materials (AIIM), University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia.
² Key Laboratory of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
³ Carbon Composite Department, Composites Research Division, Korea Institute of Materials Science (KIMS), 797, Changwon-daero, Seongsan-gu, Changwon-si 51508, Gyeongsangnam-do, Korea.
⁴ School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.
⁵ International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
⁶ Department of Chemistry, Kookmin University, 77 Jeongneung ro, Seongbuk gu, Seoul 02707, Korea.

Abstract

The hybrid metal-organic frameworks (MOFs) with different Zn²⁺/Co²⁺ ratios are synthesized at room temperature with deionized water as the solvent. This use of deionized water can increase the yield of hybrid MOFs (up to 65-70%). After the pyrolysis, the obtained nanoporous carbons (NPCs) show a decrease in the surface area, in which the highest surface area is 655 m² g^-1. The as-prepared NPCs are subjected to activation with KOH in order to increase their surface area and convert cobalt nanoparticles (Co NPs) to Co oxides. These activated carbons are applied to electrical double-layer capacitors (EDLCs) and pseudocapacitors due to the presence of CoO and Co₃O₄ nanoparticles in the carbon framework, leading to significantly enhanced specific capacitance as compared to that of pristine NPCs. This synthetic method can be utilized in future research to enhance pseudocapacitance further while maintaining the maximum surface area of the carbon materials.

Keywords: activated carbon; capacitor; hybrid MOFs; microporous; nanoporous carbon.

Grants and funding

PNK5600/Korea Institute of Materials Science