Journal
SMALL
Volume 16, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201906458
Keywords
anion regulation; encapsulated hybrids; flexible quasi-solid-state supercapacitors; in situ structural reconstruction; orientated metal organic frameworks
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MIST) [NRF-2017M3A7B4041987]
- Korea Electric Power Corporation [R19XO01-23]
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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 Co3O4 (P-Co3O4) 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-Co3O4@P, N-C could reduce the adsorption energy of OH- and regulate the electrical properties. Accordingly, the P-Co3O4@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-Co3O4@P, N-C, Co@P, N-C is simultaneously developed, which can be integrated with P-Co3O4@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.
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