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Electrokinetic power generation in conical nanochannels: regulation effects due to conicity

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Abstract

Electrokinetic power generation is a promising clean energy production technology, which utilizes the electric double layer in a nanochannel to convert the hydrodynamic energy to electrical power. Previous research largely focused on electrokinetic power generation in nanochannels with a uniform cross-section. In this work, we perform a systematic investigation of electrokinetic power generation in a conical nanochannel. For this purpose, a multiphysical model consisting of the Planck–Nernst–Poisson equations and the Navier–Stokes equation is formulated and solved numerically. In particular, we discover various regulation effects in electrokinetic power generation in conical nanochannels, which manifest as the difference in the power generation characteristics (streaming potential, streaming current and current–voltage relationship) between two opposite pressure differences of the same magnitude. These regulation effects are found to originate from the conicity of the nanochannel. Furthermore, the regulation parameters are defined to quantify the observed regulation effects. Various regulation parameters can be up to severals tens of percent under extreme conditions (e.g., large pressure difference, high surface charge density or large conicity), indicating the substantial significance of the regulation effects in electrokinetic power generation. The conclusions from this work can serve as an important reference for the design and operation of nanofluidic electrokinetic power generation devices.

Graphical abstract: Electrokinetic power generation in conical nanochannels: regulation effects due to conicity

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Article information


Submitted
27 Sep 2019
Accepted
18 Dec 2019
First published
18 Dec 2019

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Electrokinetic power generation in conical nanochannels: regulation effects due to conicity

F. Qian, W. Zhang, D. Huang, W. Li, Q. Wang and C. Zhao, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP05317D

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