@article{Umezawa2023, 
author = {Shigeyuki Umezawa and Takashi Douura and Koji Yoshikawa and Daisuke Tanaka and Vlad Stolojan and S. Ravi P. Silva and Mika Yoneda and Kazuma Gotoh and Yasuhiko Hayashi},
title = {Zinc-Based Metal–Organic Frameworks for High-Performance Supercapacitor Electrodes: Mechanism Underlying Pore Generation},
year = {2023},
journal = {Energy & Environmental Materials},
volume = {6},
number = {2},
keywords = {metal–organic frameworks, pore generation, porous carbons, supercapacitor, zinc oxides},
url = {https://www.sciopen.com/article/10.1002/eem2.12320},
doi = {10.1002/eem2.12320},
abstract = {Heat treatment of metal–organic frameworks (MOFs) has provided a wide variety of functional carbons coordinated with metal compounds. In this study, two kinds of zinc-based MOF (ZMOF), C16H10O4Zn (ZMOF1) and C8H4O4Zn (ZMOF2), were prepared. ZMOF1 and ZMOF2 were carbonized at 1000 ℃, forming CZMOF1 and CZMOF2, respectively. The specific surface area (SBET) of CZMOF2 was ~2700 m2 g−1, much higher than that of CZMOF1 (~1300 m2 g−1). A supercapacitor electrode based on CZMOF2 achieved specific capacitances of 360, 278, and 221 F g−1 at 50, 250, and 1000 mA g−1 in an aqueous electrolyte (H2SO4), respectively, the highest values reported to date for ZMOF-derived electrodes under identical conditions. The practical applicability of the CZMOF-based supercapacitor was verified in non-aqueous electrolytes. The initial capacitance retention was 78% after 100000 charge/discharge cycles at 10 A g−1. Crucially, the high capacitance of CZMOF2 arises from pore generation during carbonization. Below 1000 ℃, pore generation is dominated by the Zn/C ratio of ZMOFs, as carbon atoms reduce the zinc oxides formed during carbonization. Above 1000 ℃, a high O/C ratio becomes essential for pore generation because the oxygen functional groups are pyrolyzed. These findings will provide insightful information for other metal-based MOF-derived multifunctional carbons.}
}