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Covalency modulation doping enables durable high-voltage operation in NiO-based all-solid-state electrochromic

Dukang Yan1, Huawei Bai2, Liwei Cao3

  • 1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, P. R. China.

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|April 24, 2026
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Summary
This summary is machine-generated.

This study enhances electrochromic devices (ECDs) by doping NiO with Mo6+, improving durability and optical modulation for smart windows. This strategy prevents degradation during high-voltage cycling.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Devices

Background:

  • Inorganic all-solid-state electrochromic devices (ECDs) are crucial for smart windows but face challenges like low optical contrast, slow kinetics, and poor stability.
  • High-voltage operation improves performance but accelerates degradation through phase transitions and structural damage.

Purpose of the Study:

  • To investigate the degradation mechanisms in NiO-based ECDs under high-voltage cycling.
  • To develop a strategy for enhancing the durability and performance of high-voltage ECDs.

Main Methods:

  • Investigated degradation via strengthened Ni-O covalency and metastable phase accumulation.
  • Employed Mo6+ doping to modulate Ni-O bonding and promote heterojunction formation.
  • Utilized in-situ characterizations and theoretical calculations.

Main Results:

  • Mo doping weakened Ni-O bonds, enabling regenerable Ni/MoxNi1-xOy heterojunctions.
  • The Mo-doped ECD demonstrated over 17,000 cycles without degradation.
  • Achieved high optical modulation (82.09%) and coloration efficiency (236.51 cm2 C-1).

Conclusions:

  • Mo6+ doping offers a general strategy for creating durable high-voltage electrochromic devices.
  • This approach overcomes limitations of NiO-based ECDs, paving the way for advanced adaptive optoelectronics.
  • The findings are applicable to the development of stable high-voltage energy devices.