Issue 71, 2020, Issue in Progress

Synergistic effect of hierarchical nanopores in Co-doped cobalt oxide 3D flowers for electrochemical energy storage

Abstract

Hybridizing hierarchical porous transition oxides composed of nanoscale building blocks is highly desirable for improving the electrochemical performance of energy storage. Herein, we contribute a fabrication of novel hierarchically nanoporous flower-shaped metal/transition oxide (Co/Co3O4–CoO) with controllable three-dimensional structure. The designed Co/Co3O4–CoO 3D flowers (3DFs) are made of petal-shaped nanoporous Co3O4–CoO nanosheets with tunable pore sizes, in which metallic Co nanoparticles tend to attach to the edge of larger ones. The hierarchically nanoporous 3DFs with bimodal pore size distribution and higher fraction of small nanopores exhibit a higher specific capacitance (902.3 F g−1 at current density of 2 A g−1) and better cyclability than the uniformly nanoporous 3DFs with unimodal pore size distribution and larger BET surface area. The enhanced capacitance is mainly derived from the synergistic effect of hierarchical nanopores, in which large nanopores disproportionately facilitate osmotic solution flux and diffusive solute transport, whilst small nanopores supply faster channels for electron transportation and ion diffusion. Our work should provide a strategy to fabricate a smart functional hierarchical nanoporous architecture with 3DF structures for the development of electrochemical energy storage materials.

Graphical abstract: Synergistic effect of hierarchical nanopores in Co-doped cobalt oxide 3D flowers for electrochemical energy storage

Supplementary files

Article information

Article type
Paper
Submitted
29 Sep 2020
Accepted
11 Nov 2020
First published
09 Dec 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 43825-43833

Synergistic effect of hierarchical nanopores in Co-doped cobalt oxide 3D flowers for electrochemical energy storage

X. Deng, H. Zhang, J. Zhang, D. Lei and Y. Peng, RSC Adv., 2020, 10, 43825 DOI: 10.1039/D0RA08319D

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