Slippery Lipid-Coated Nanopores Triple Blue Energy Output by Reducing Ionic Friction in Osmotic Power Systems

EPFL scientists boost blue energy by 3x using lipid-coated nanopores that reduce ion friction, moving osmotic power closer to practical renewable use.

By: AXL Media

Published: Mar 10, 2026, 7:05 AM EDT

Source: The information in this article was sourced from Ecole Polytechnique Fédérale de Lausanne

Harvesting Power From the Meeting of Waters

Osmotic energy, commonly known as blue energy, represents a frontier in renewable electricity by capturing the energy released when saltwater and freshwater mix. This natural process occurs at river estuaries where a chemical potential difference drives ions through a selective membrane, creating a measurable voltage. Historically, the technology has struggled with a trade-off between speed and selectivity; membranes that allowed ions to flow quickly often failed to separate charges effectively, while durable materials were often too restrictive for commercial use. The latest research provides a path forward by focusing on the microscopic mechanics of ion transport.

The Innovation of Lipid-Coated Nanostructures

A team from EPFL’s Laboratory for Nanoscale Biology has introduced a hybrid approach that combines the high porosity of polymer membranes with the precision of nanofluidic channels. By coating silicon-nitride nanopores with liposomes—tiny bubbles of lipid molecules—the researchers created a surface that facilitates rapid ionic movement. These lipids, which are the same building blocks found in living cell membranes, naturally organize themselves to shield the nanopore surface. This biological inspiration allows the system to maintain its charge-selective properties while overcoming the physical resistance that typically slows down energy conversion in synthetic devices.

Hydration Lubrication as a Performance Booster

The secret to the membrane's efficiency lies in a phenomenon called "hydration lubrication." When the lipid bilayers align within the stalactite-shaped nanopores, their water-attracting heads pull in a microscopic layer of water only a few molecules thick. This thin liquid film clings to the pore walls, preventing ions from directly striking the solid surface. By creating this slippery water buffer, friction is drastically reduced, allowing ions to "supercharge" through the membrane. This mechanism ensures that the flow remains orderly and fast, directly addressing the friction bottleneck that has kept blue energy confined to small-scale laboratory settings.