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

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Abstract

To prepare electrically colour-switching brown and bleached devices, we investigated the electrochromism of electrodes with cobalt hexacyanoferrate (CoHCF) fabricated with a coating of ink composed of water-dispersible CoHCF nanoparticles (CoHCF-NPs). The CoHCF-NPs with surface modification with hexacyanoferrate anions were well dispersed in aqueous solution. A film shows a clear brown–bleached colour change in the presence of an applied potential switching between +1.4 V and −0.4 V. To exhibit the brown colour during electrochromism, the co-existence of a Co(III)–Fe(II) blue low spin and a Co(II)–Fe(III) red high spin state is 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 incorporated electrochromic devices exhibiting the brown–bleached colour change were also demonstrated in combination with a counter-electrode of zinc hexacyanoferrate nanoparticles having no colour in either redox state.

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

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Publication details

The article was received on 11 Jun 2017, 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, Advance Article
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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, Advance Article , DOI: 10.1039/C7TC02576A

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