Regulating the electrochemical behaviours of a hierarchically structured Co3 (PO4 )2 /Ni-Co-O for a high-performance all-solid-state supercapacitor

Dalton Transactions : an International Journal of Inorganic Chemistry
Tianxiang YanShaokui Cao

Abstract

Battery-type materials (e.g., transition metal phosphates) have been intensely explored in supercapacitors due to their rich electroactive sites and high theoretical capacity. Yet poor rate performance, resulting in a low energy density at high current density, limits their further applications. Herein, an improvement in rate performance resulting from enhanced surface capacitive behaviour contribution has been observed in a hierarchically structured Co3(PO4)2/Ni-Co-O@Ni foam (CPNO-12). The optimized CPNO-12 synthesized through a facile hydrothermal treatment also exhibits a striking gravimetric and areal capacity of 1410C g-1 (14 100 mC cm-2) at 5 mA cm-2 and superb cyclability (91% of retention at 50 mA cm-2 after 12 000 cycles), which can be attributed to its unique hierarchical porous structure and high mass loading per area. More importantly, a high-performance all-solid-state asymmetric supercapacitor with CPNO-12 and Fe2P/graphene hydrogel@Ni foam as positive and negative electrodes respectively has been assembled; the device delivering a maximum energy density of 95 W h kg-1 (32 mW h cm-3) and maximum power density of 4000 W kg-1 (800 mW cm-3) has the potential to power sophisticated systems. These attractive performanc...Continue Reading

References

Jan 23, 2009·Journal of the American Chemical Society·Torsten BrezesinskiSarah H Tolbert
Oct 1, 2016·ACS Applied Materials & Interfaces·Han ShaoKafil M Razeeb
Dec 6, 2016·Nature Materials·Hyung-Seok KimBruce Dunn
Mar 7, 2017·Nature Communications·Kwadwo Asare OwusuLiqiang Mai
Mar 28, 2018·ACS Nano·Yury Gogotsi, Reginald M Penner

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Citations

May 27, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Bahareh AmeriSaied Saeed Hosseiny Davarani

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Methods Mentioned

BETA
scanning electron microscopy
X-ray
scanning
transmission electron microscopy

Software Mentioned

CPNO

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