Herein, the synergistic effects of
hollow nanoarchitecture and
high specific surface area of hollow activated carbons (HACs) are
reported with the superior supercapacitor (SC) and capacitive deionization
(CDI) performance. The center of zeolite imidazolate framework-8 (ZIF-8)
is selectively etched to create a hollow cavity as a macropore, and
the resulting hollow ZIF-8 (HZIF-8) is carbonized to obtain hollow
carbon (HC). The distribution of nanopores is, subsequently, optimized
by KOH activation to create more nanopores and significantly increase
specific surface area. Indeed, as-prepared hollow activated carbons
(HACs) show significant improvement not only in the maximum specific
capacitance and desalination capacity but also capacitance retention
and mean desalination rates in SC and CDI, respectively. As a result,
it is confirmed that well-designed nanoarchitecture and porosity are
required to allow efficient diffusion and maximum electrosorption
of electrolyte ions.
In this study, we successfully demonstrate the synthesis of a novel necklace-like Co, Fe, and N co-doped one-dimensional (1D)-assembly of hollow carbon nanoboxes (1D-HCNB-x) and its potential for supercapacitor application.
Hollow carbon‐based nanoarchitectures (HCAs) derived from zeolitic imidazolate frameworks (ZIFs), by virtue of their controllable morphology and dimension, high specific surface area and nitrogen content, richness of metal/metal compounds active sites, and hierarchical pore structure and easy exposure of active sites, have attracted great interests in many fields of applications, especially in heterogeneous catalysis, and electrochemical energy storage and conversion. Despite various approaches that have been developed to prepare ZIF‐derived HCAs, the hollowing mechanism has not been clearly disclosed. Herein, a specialized overview of the recent progress of ZIF‐derived HCAs is introduced to provide an insight into their preparation strategy and the corresponding hollowing mechanisms. Based on the fundamental understanding of the structural evolution of ZIF nanocrystals during the high‐temperature pyrolysis process, the hollowing mechanisms of ZIF‐derived HCAs are classified into four categories: i) inward contraction of core–shell template@ZIF composites or hollow ZIFs, ii) outward contraction of ZIF@shell composites, iii) special outward contraction of ZIF arrays, and iv) mechanism beyond inward/outward contraction of pure ZIF nanocrystals. Finally, an outlook on the development prospects and challenges of HCAs based on ZIF precursors, especially in terms of controlled synthesis and future electrochemical application, is further discussed.
Correction for ‘Co, Fe and N co-doped 1D assembly of hollow carbon nanoboxes for high-performance supercapacitors’ by Minjun Kim et al., J. Mater. Chem. A, 2022, 10, 24056–24063, https://doi.org/10.1039/D2TA06950D.
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