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178 results on '"Wang, Kuaibing"'

28. Novel isostructural iron‐series‐MOF calcined derivatives as positive and negative electrodes: A new strategy to obtain matched electrodes in a supercapacitor device.

Author

Dong, Yawen, Liu, Jiadi, Zhang, Hui, Li, Qingqing, Mao, Feifei, Lu, Aimin, Wu, Hua, Wang, Kuaibing, Zhang, Cheng, and Zhang, Qichun

Abstract

The performance of asymmetric supercapacitors (ASCs) is strongly restricted by the capacity gap between the positive and negative electrodes. To address this issue, two new electrode materials deriving from Co‐ and Fe‐based metal–organic frameworks (MOFs, Co‐TAMBA‐d, and Fe‐TAMBA‐d) through a single‐step sintering method have been developed by considering the superiorities of the derivatives of MOFs including large surface areas, sufficient metal‐atom‐doping content, and extreme surface wettability to the bath solution. The as‐prepared Co‐TAMBA‐d as a positive electrode delivers typical pseudocapacitive behavior with the improvement of capacity, which is better than those of pristine MOF materials, while Fe‐TAMBA‐d as negative electrodes displays better electrochemical behavior than those of activated carbon. ASCs based on these two electrodes exhibits excellent energy density and power density of 47 W h/kg and 1658 W/kg, respectively, where this device can maintain prominent cycling stability with capacity retention after 5000 cycles being about 75%. Furthermore, the capacity can feed a series of red light‐emitting diodes, which gives solid evidence of the potential utilization. These results can afford the feasibility of isostructural MOF derivatives as promising electrodes in novel ASCs. [ABSTRACT FROM AUTHOR]

Published
2023
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40. Cu/CuxO@C nanocomposites as efficient electrodes for high-performance supercapacitor devices.

Author

Guo, Yuxuan, Chen, Changyun, Wang, Yumeng, Hong, Ye, Wu, Hua, Wang, Kuaibing, Niu, Dongdong, Zhang, Cheng, and Zhang, Qichun

Subjects
SUPERCAPACITOR electrodes, SUPERCAPACITORS, ENERGY density, ELECTRIC conductivity, CALCINATION (Heat treatment), POWER density, TEREPHTHALIC acid, ION transport (Biology)
Abstract

A novel method, reduction followed by oxidation procedure, has been developed to fabricate efficient electrodes derived from metal–organic frameworks (MOFs), which were synthesized using terephthalic acid (TP) and 1,3,5-benzenetricarboxylic acid (BTC) as organic ligands. The copper-based composites, namely Cu/CuxO@C (x = 1 and 2), were obtained through two steps: first calcining the precursors at high temperature under a nitrogen atmosphere, and then calcining in air to increase the number of porous active sites. For a more convenient description, the calcined materials are denoted as 800-TP, 900-TP, 800-BTC and 900-BTC, respectively, according to the calcination temperature and the corresponding organic ligand. Their electrochemical performances in supercapacitors (SCs) suggest that a higher calcination temperature endows the as-resultant materials with a larger specific surface area, higher carbon content, higher electrical conductivity, and better ion transport ability. For example, the 900-BTC electrode delivers a specific capacity of 400 C g−1 at a current density of 3 A g−1 under a three-electrode configuration. Even under a double-electrode system, the corresponding 900-BTC//AC device (AC represents activated carbon) also achieves superior electrochemical performance with an energy density of 24.02 W h kg−1 at a power density of 825 W kg−1 and the specific capacitance retention rate for the device is maintained at 91.7% after 3000 unceasing loops, indicating its potential for practical applications. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Enhancing the Performance of a Battery–Supercapacitor Hybrid Energy Device Through Narrowing the Capacitance Difference Between Two Electrodes via the Utilization of 2D MOF-Nanosheet-Derived Ni@Nitrogen-Doped-Carbon Core–Shell Rings as Both Negative and Positive Electrodes

Author

Wang, Kuaibing, primary, Wang, Zikai, additional, Liu, Jiadi, additional, Li, Chao, additional, Mao, Feifei, additional, Wu, Hua, additional, and Zhang, Qichun, additional

Published
2020
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