Issue 25, 2021

Lamellar porous vermiculite membranes for boosting nanofluidic osmotic energy conversion

Abstract

Lamellar membranes with two-dimensional nanofluidic channels hold great promise in harvesting osmotic energy from salinity gradients. However, the power density is often limited by the high transmembrane resistance primarily caused by the tortuous interlayer ion diffusion pathway. Here, we demonstrate the great potential of lamellar porous vermiculite membranes (PVMs) as efficient nanofluidic osmotic energy generators. The artificial in-plane nanopores on vermiculite nanosheets dramatically decrease the tortuosity and offer additional vertical ion pathways, substantially elevating the transmembrane ion flux. Meanwhile, the confined interlayer spacing serves as the selective barrier, contributing to a high ion selectivity. When operating under a 1000-fold salinity gradient, the PVMs achieve a 16-fold increase in output power density compared with nonporous vermiculite membranes, with a maximum value of 10.9 W m−2 that outperforms those of most of the state-of-the-art 2D lamellar membranes.

Graphical abstract: Lamellar porous vermiculite membranes for boosting nanofluidic osmotic energy conversion

Supplementary files

Article information

Article type
Paper
Submitted
22 Mar 2021
Accepted
01 Jun 2021
First published
01 Jun 2021

J. Mater. Chem. A, 2021,9, 14576-14581

Lamellar porous vermiculite membranes for boosting nanofluidic osmotic energy conversion

L. Cao, H. Wu, C. Fan, Z. Zhang, B. Shi, P. Yang, M. Qiu, N. A. Khan and Z. Jiang, J. Mater. Chem. A, 2021, 9, 14576 DOI: 10.1039/D1TA02400K

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