Journal
NANOTECHNOLOGY
Volume 32, Issue 44, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac17c2
Keywords
supercapacitor; prussian blue analogue; polypyrrole; microspheres
Funding
- National Natural Science Foundation of China [21962017, 21968032, 31760608]
- Fundamental Research Funds for the Central Universities [31920200086, 31920200042, 31920200002]
- Natural Science Foundation of Gansu Province [21YF1GA225]
- project of cultivating higher education teaching achievements in Gansu Province [2019GSJXCGPY-10]
- Northwest Minzu University's Double First-class and Characteristic Development Guide Special Funds-Chemistry Key Disciplines in Gansu Province [11080316]
- Innovation Team Construction project of Northwest Minzu University [1110130139, 1110130141]
- Key laboratory for Utility of Environmental Friendly Composite Materials and Biomass in University of Gansu Province (Northwest Minzu University)
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Scientists have improved the conductivity of PBAs by coating nickel cobalt hexacyanoferrate (Ni2CoHCF) with polypyrrole, which demonstrated outstanding specific capacity. The Ni2CoHCF@PPy-400 microspheres, when coupled with activated carbon, showed a high energy density and good cycle stability, making them a promising candidate for advanced energy storage devices.
Recently, prussian blue analogues (PBAs), as the most classical class of metal-organic frameworks, have been widely studied by scientists. Nevertheless, the inferior conductivity of PBAs restricts the application in supercapacitors. In this work, nickel cobalt hexacyanoferrate (Ni2CoHCF) had been produced via a simple co-precipitation approach and coated with polypyrrole on its surface. The conductivity of PBAs was improved by the polypyrrole coating. The Ni2CoHCF@PPy-400 microspheres were demonstrated to the outstanding specific capacity of 82 mAh g(-1) at 1 A g(-1). After 3000 cycles, the Ni2CoHCF@PPy-400 microspheres had a long cycle life and 86% specific capacity retention rate at 5 A g(-1). Additionally, it was coupled with activated carbon to build high performance asymmetric supercapacitor (Ni2CoHCF@PPy-400//AC), which displayed a high energy density of 21.7 Wh kg(-1) at the power density of 888 W kg(-1) and good cycle stability after 5000 cycles (a capacity retention rate of 85.2%). What is more, the results reveal that the Ni2CoHCF@PPy-400 microspheresare a prospective candidate for exceptional energy storage devices.
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