Journal
DALTON TRANSACTIONS
Volume 50, Issue 13, Pages 4643-4650Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0dt03966g
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In this study, Co-Zn LDH@Co(H2PO4)(2) nanoflowers were successfully synthesized via a hydrothermal method, providing high surface area and electrochemically active sites, as well as improved conductivity for the composite electrode. The Co-Zn LDH@Co(H2PO4)(2) as the positive electrode exhibited high specific capacity at high current density. A hybrid supercapacitor with good energy density and cycling stability was achieved at high power density.
Layered double hydroxides (LDHs) with high theoretical specific capacity have been considered as one of the most promising candidates for high-performance supercapacitors. However, the low electronic conductivity and insufficient active sites hinder the further large-scale application of bulk LDHs. Here, we successfully synthesized heterostructured Co-Zn LDH@Co(H2PO4)(2) nanoflowers by a simple hydrothermal method. As the amount of Co(H2PO4)(2) in the whole heterostructure increases, the nanosheets steadily evolve into nanoflowers with a high surface area, providing more electrochemically active sites. Moreover, the built-in electric field formed between Co-Zn LDH and Co(H2PO4)(2) improves the conductivity of the composite electrode. As a result, the as-prepared Co-Zn LDH@Co(H2PO4)(2) shows a high specific capacity of 919 C g(-1) at a current density of 1 A g(-1). A hybrid supercapacitor (HSC) with activated carbon (AC) as the negative electrode and Co-Zn LDH@Co(H2PO4)(2) as the positive electrode delivers an energy density of 30.4 W h kg(-1) at a power density of 400 W kg(-1), and 95.3% of the initial capacity is retained after 5000 cycles. This study provides a novel synthesis strategy for constructing heterojunctions to enhance the energy storage properties of LDH-based materials.
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