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Solution synthesis of nanometric layered cobalt oxides for electrochemical applications

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Abstract.
Dispersed Na0.6CoO2·yH2O and Li0.5CoO2 powders have been obtained at room temperature by rapid
precipitation in aqueous solutions of LiOH or NaOH in the presence of a strong oxidizer. The precipitates
are well crystallized and consist of nanoscale platelets with high specific area (above 100 m2/g). The
Li0.5CoO2 phase is stable in aqueous electrolytes whereas the Na0.6CoO2·yH2O rapidly converts to CoOOH
in neutral electrolytes or pure water. It also transforms to anhydrous Na0.6CoO2 upon drying at moderate
temperatures. Electrochemical studies show that at slow sweep rates the Na0.6CoO2·yH2O can store large
amounts of charge in 10 M NaOH from a combination of both faradic and capacitive reactions.

Keywords:
NaxCoO2 nanoparticles
Colloidal oxide
Ionic exchange
Pseudocapacitor
Cyclic voltammetry

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

New York : Elsevier Ltd.., 2012

Deskripsi Fisik

Electrochimica Acta 66 (2012) 306– 312

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

66 (2012)

Subjek

PSEUDOKAPASITOR

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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