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Super-Assembled Multi-Level Asymmetric Mesochannels for Coupled Accelerated Dual-Ion Selective Transport.

Shan Zhou1, Lei Xie1, Xin Zhang1

  • 1Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, Laboratory of Advanced Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|November 26, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel multi-level asymmetric nanofluidic device using a super-assembly strategy. This device enhances ion selectivity and energy conversion efficiency for salinity gradient power generation.

Keywords:
dual-ion selectivitymesochannelsmulti-level asymmetrysuper-assembly

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Energy Conversion

Background:

  • Asymmetric nanofluidic devices show promise for energy conversion.
  • Current devices suffer from limited ion selectivity and efficiency due to single-level asymmetry and single-ion selective layers.

Purpose of the Study:

  • To construct a multi-level asymmetric nanofluidic device with enhanced ion selectivity and energy conversion performance.
  • To investigate the impact of multi-level asymmetry and dual-ion selective layers on device performance.

Main Methods:

  • Super-assembly strategy was employed to construct a multi-level asymmetric mesoporous carbon/anodized aluminum/mesoporous silica (MC/AAO/MS) nanofluidic device.
  • The device features abundant and ordered mesochannels.
  • Ion transport and storage-release performance were characterized.

Main Results:

  • The MC/AAO/MS device exhibited diode-like ion transport and outstanding ion storage-release capabilities.
  • Coupling of MC and MS dual-ion selective layers significantly enhanced cation selectivity and ionic conductance.
  • The device achieved a power density of 5.37 W m⁻² and a conversion efficiency of 32.79% in salinity gradient energy conversion.
  • Performance was significantly higher than single-level asymmetric nanochannels.

Conclusions:

  • The multi-level asymmetric structure and dual-ion selective transport are key to enhanced cation selectivity and energy conversion efficiency.
  • This work presents a new approach for designing advanced nanofluidic devices for energy applications.