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Interpenetrated and polythreaded CoII-organic framework as a supercapacitor electrode material with ultrahigh capacity and excellent energy delivery efficiency Kuaibing Wang, Xiaoran Cao, Saier Wang, Wenjia Zhao, Jiangyan Xu, Zikai Wang, and Hua Wu ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.7b16141 • Publication Date (Web): 15 Feb 2018 Downloaded from http://pubs.acs.org on February 17, 2018
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Interpenetrated and polythreaded CoII-organic framework as a supercapacitor electrode material with ultrahigh capacity and excellent energy delivery efficiency Kuaibing Wang,†,‡ Xiaoran Cao,† Saier Wang,† Wenjia Zhao,† Jiangyan Xu†, Zikai Wang and Hua Wu†,* †
Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing 210095, P. R. China
‡
State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing University, Nanjing 210093, P. R. China *Corresponding author:
[email protected] (H. Wu).
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Abstract: Synthesizing kinetically stable coordination polymers (CPs) through ligand functionalization can effectively improve their supercapacitive performances. Herein, we have successfully synthesized three novel and topological Co-CPs by variation of flexible N-donor ligand and inorganic anions, namely interpenetrated [Co(HTATB)(o-bib)]·H2O, extended 2D layered Co(HTATB)(m-bib)·2H2O and 3D Co(HTATB)(m-bib), where bib is the flexibly N-donor bis((1H-imidazol-1-yl)methyl)benzene linker (o- and m- means ortha- and metraseparately)
ligand
and
HTATB
is
the
deprotonation
mode
from
4,4',4''-s-triazine-2,4,6-triyl-tribenzoic acid (H3TATB). The various Co-CPs have been directly applied in the field of supercapacitors. All these framework materials exhibit high capacitance, excellent energy delivery efficiency and good cycling performance. For instance, the maximum specific capacitance for penetrated 3D networks is 2572 F g-1 at 2.0 A g-1, and the mean energy delivery efficiency is up to 92.7% based on the tested current densities. Comparing extensional 2D layered and 3D networks, the 3D interpenetrated and polythreaded architectures, which could provide more active sites and thus promote fast charging and discharging process. Furthermore, the Li+ uptake-release abilities for the Co-based CPs are also investigated and the initial discharge capacity value for the 3D interpenetrated structures can reach up to 1792 mAh g-1 at a current density of 50 mA g-1. Keywords: CoII-organic frameworks; supercapacitor; ultrahigh capacity; energy delivery efficiency; 3D networks; interpenetrated.
1. Introduction Supercapacitors (SCs) are one of energy storage systems that have been considered as the next-generation portable devices due to the features of long-cycle life, no memory effect, operational safety and high power density.1-15 Compared with batteries, SCs not only store the equal energy but also recharge in a very short time. Most importantly, SCs can provide the high-power needed during acceleration and braking when they integrate with other 2 ACS Paragon Plus Environment
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energy-storage systems, such as fuel cells, batteries and so on.16,17 However, the reported energy density for current SCs is less than 10 Wh kg-1, which is extremely low in contrast with lead-acid (
