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Cobalt hexacyanoferrate nanoparticles for wet-processed brown–bleached electrochromic devices with hybridization of high-spin/low-spin phases

Abstract

To prepare electrically colour-switching brown and bleached devices, we investigated the electrochromism of electrodes with cobalt hexacyanoferrate (CoHCF) fabricated by the coating of ink composed of water-dispersible CoHCF nanoparticles (CoHCF-NP). The CoHCF-NP with surface modification by hexacyanoferrate anion was well dispersed into aqueous solution. A film shows clear brown or bleached colour change by applied potential switching between + 1.4 V and 0.4 V. To exhibit the brown colour during electrochromism, the co-existence of the Co(III)-Fe(II) blue low spin and the Co(II)-Fe(III) red high spin state are expected to be crucially important. Hybridization of the spin states was confirmed by the shift of the infrared spectrum corresponding to the CN-vibration mode. CoHCF-NP implemented electrochromic devices exhibiting the brown–bleached colour change were also demonstrated in a combination with a counter-electrode of zinc hexacyanoferrate nanoparticles having no colour in either redox state.

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Publication details

The article was accepted on 12 Jul 2017 and first published on 15 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02576A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Cobalt hexacyanoferrate nanoparticles for wet-processed brown–bleached electrochromic devices with hybridization of high-spin/low-spin phases

    E. Kholoud, H. Watanabe, A. Takahashi, M. M. Emara, B. A. Abd-El-Nabey, M. Kurihara, K. Tajima and T. Kawamoto, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02576A

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