Phosphorus Regulated Cobalt Oxide@Nitrogen-Doped Carbon Nanowires for Flexible Quasi-Solid-State Supercapacitors

Liu, Shude, Yin, Ying, Shen, Yang, Hui, Kwan San, 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
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Depositing User: LivePure Connector
Date Deposited: 04 Feb 2020 04:43
Last Modified: 11 Jul 2020 23:55
DOI: 10.1002/smll.201906458

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