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Regulation of carbon content in MOF-derived hierarchical-porous NiO@C films for high-performance electrochromism

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Abstract

Nickel oxide (NiO) is a promising candidate in practical electrochromic (EC) applications owing to its low cost and neutral colored state. However, the co-influence of low electrical conductivity and small lattice spacing leads to the slow switching speed and poor coloration efficiency of NiO-based EC electrodes. In this study, novel hierarchical-porous NiO@C thin film electrodes are fabricated through two-step pyrolysis of Ni-MOF on FTO glass, and the electrochemical and electrochromic performance of the electrodes can be improved by the regulation of the carbon residues. As a result, the desired NiO@C EC electrodes with both good ion diffusion and electrical conductivity are achieved. The film electrode shows a fast switching speed (0.46 s for coloring/0.25 s for bleaching), high coloration efficiency (113.5 cm2 C−1) and ultra-stable EC cycles (90.1% after 20 000 cycles). Additionally, EC eyewear devices and digital displays are assembled to illustrate the feasibility of the material in wearable devices and smart electronics.

Graphical abstract: Regulation of carbon content in MOF-derived hierarchical-porous NiO@C films for high-performance electrochromism

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Publication details

The article was received on 05 Sep 2018, accepted on 06 Dec 2018 and first published on 07 Dec 2018


Article type: Communication
DOI: 10.1039/C8MH01091A
Citation: Mater. Horiz., 2019, Advance Article
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    Regulation of carbon content in MOF-derived hierarchical-porous NiO@C films for high-performance electrochromism

    H. Liang, R. Li, C. Li, C. Hou, Y. Li, Q. Zhang and H. Wang, Mater. Horiz., 2019, Advance Article , DOI: 10.1039/C8MH01091A

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