Phosphorus regulated cobalt oxide@nitrogen-doped carbon nanowires for flexible quasi-solid-state supercapacitors

Liu, Shude, Yin, Ying, Shen, Yang, Hui, Kwan San ORCID:, Chun, Young Tea, Kim, Jong Min, Hui, Kwun Nam, Zhang, Lipeng and Jun, Seong Chan (2020) Phosphorus regulated cobalt oxide@nitrogen-doped carbon nanowires for flexible quasi-solid-state supercapacitors. Small, 16 (4). ISSN 1613-6810

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Battery-type materials are promising candidates for achieving high specific capacity for supercapacitors. However, their slow reaction kinetics hinders the improvement in electrochemical performance. Herein, a hybrid structure of P-doped Co3 O4 (P-Co3 O4 ) ultrafine nanoparticles in situ encapsulated into P, N co-doped carbon (P, N-C) nanowires by a pyrolysis-oxidation-phosphorization of 1D metal-organic frameworks derived from Co-layered double hydroxide as self-template and reactant is reported. This hybrid structure prevents active material agglomeration and maintains a 1D oriented arrangement, which exhibits a large accessible surface area and hierarchically porous feature, enabling sufficient permeation and transfer of electrolyte ions. Theoretical calculations demonstrate that the P dopants in P-Co3 O4 @P, N-C could reduce the adsorption energy of OH- and regulate the electrical properties. Accordingly, the P-Co3 O4 @P, N-C delivers a high specific capacity of 669 mC cm-2 at 1 mA cm-2 and an ultralong cycle life with only 4.8% loss over 5000 cycles at 30 mA cm-2 . During the fabrication of P-Co3 O4 @P, N-C, Co@P, N-C is simultaneously developed, which can be integrated with P-Co3 O4 @P, N-C for the assembly of asymmetric supercapacitors. These devices achieve a high energy density of 47.6 W h kg-1 at 750 W kg-1 and impressive flexibility, exhibiting a great potential in practical applications.

Item Type: Article
Additional Information: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Uncontrolled Keywords: co3o4,efficient,evolution,graphene oxide,high-energy,hybrid supercapacitor,nanotube arrays,ni foam,oxygen reduction,performance,anion regulation,encapsulated hybrids,flexible quasi-solid-state supercapacitors,in situ structural reconstruction,orientated metal organic frameworks
Faculty \ School: Faculty of Science > School of Engineering
UEA Research Groups: Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV)
Faculty of Science > Research Groups > Energy Materials Laboratory
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Depositing User: LivePure Connector
Date Deposited: 04 Feb 2020 04:43
Last Modified: 20 Apr 2023 12:30
DOI: 10.1002/smll.201906458


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