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Nano Research 2023, 16(2): 3294-3303 https://doi.org/10.1007/s12274-022-4928-8
Research Article | Issue | Published: 22 October 2022

Designing TiO2/Au/Prussian blue heterostructures nanorod arrays for ultra-stable cycle and ultra-fast response electrochromism

Show Author's Information Miao Xu1,  Kang Li2,  Shen Wang1,  Shengyu Zhou1,  Hulin Zhang3,  Hongbo Xu1,  Jiupeng Zhao1( ),  Yao Li3( )
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
School of Physics, Southeast University, Nanjing 211189, China
Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
Keywords:
heterojunction, Prussian blue, Au nanoparticle, TiO2 nanorod array, electrochromic
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Cite this article:
Xu M, Li K, Wang S, et al. Designing TiO2/Au/Prussian blue heterostructures nanorod arrays for ultra-stable cycle and ultra-fast response electrochromism. Nano Research, 2023, 16(2): 3294-3303. https://doi.org/10.1007/s12274-022-4928-8
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Abstract Full text Electronic supplementary material About this article

Prussian blue (PB) is an anodic coloring candidate in the wide area of electrochromic (EC) applications. However, the co-influence of weak adhesion and low electrical conductivity leads to the poor stability and slow switching speed. To tackle this bottleneck, a novel TiO2/Au/PB nanorod array is designed through hydrothermal and electrodeposition approaches on fluorine-doped tin oxide (FTO) glass. Such a designed ternary array structure could not only increase reactive site and conductivity, but also improve ion storage capacity and promote charge transfer, attributed to the synergistic effect of TiO2/Au/PB core–shell heterostructure and the localized surface plasmon resonance (LSPR) effect of Au nanoparticles. Besides, density functional theory (DFT) calculation confirms the strong interaction between rutile TiO2 and FTO substrate, which contributes to the improvement of EC cycle stability. Benefiting from these effects, the TiO2/Au/PB film shows a fast coloration/bleaching response of 1.08/2.01 s (2.17/4.48 s, PB film) and ultra-stable EC performance of 86.8% after 20,000 cycles (50% after 600 cycles, PB film). Furthermore, the high-intensity light source can be shot clearly by the designed and assembled EC iris device (ECID) with TiO2/Au/PB film as an EC layer, while the photograph without an ECID is blurry, confirming the feasibility of the material in portable digital products.


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Electronic supplementary material
About this article

Designing TiO2/Au/Prussian blue heterostructures nanorod arrays for ultra-stable cycle and ultra-fast response electrochromism

Show Author's information Miao Xu1, Kang Li2, Shen Wang1, Shengyu Zhou1, Hulin Zhang3, Hongbo Xu1, Jiupeng Zhao1( ), Yao Li3( )
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
School of Physics, Southeast University, Nanjing 211189, China
Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China

Abstract

Prussian blue (PB) is an anodic coloring candidate in the wide area of electrochromic (EC) applications. However, the co-influence of weak adhesion and low electrical conductivity leads to the poor stability and slow switching speed. To tackle this bottleneck, a novel TiO2/Au/PB nanorod array is designed through hydrothermal and electrodeposition approaches on fluorine-doped tin oxide (FTO) glass. Such a designed ternary array structure could not only increase reactive site and conductivity, but also improve ion storage capacity and promote charge transfer, attributed to the synergistic effect of TiO2/Au/PB core–shell heterostructure and the localized surface plasmon resonance (LSPR) effect of Au nanoparticles. Besides, density functional theory (DFT) calculation confirms the strong interaction between rutile TiO2 and FTO substrate, which contributes to the improvement of EC cycle stability. Benefiting from these effects, the TiO2/Au/PB film shows a fast coloration/bleaching response of 1.08/2.01 s (2.17/4.48 s, PB film) and ultra-stable EC performance of 86.8% after 20,000 cycles (50% after 600 cycles, PB film). Furthermore, the high-intensity light source can be shot clearly by the designed and assembled EC iris device (ECID) with TiO2/Au/PB film as an EC layer, while the photograph without an ECID is blurry, confirming the feasibility of the material in portable digital products.

Keywords: heterojunction, Prussian blue, Au nanoparticle, TiO2 nanorod array, electrochromic

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Acknowledgements

Publication history

Received: 24 July 2022
Revised: 08 August 2022
Accepted: 16 August 2022
Published: 22 October 2022
Issue date: February 2023

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© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

We thank Fundamental Research Funds for the Central Universities (Nos. HIT.OCEF.2021004 and FRFCU5710090220).

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