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Osmotic energy conversion in serpentinite-hosted deep-sea hydrothermal vents
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Osmotic energy conversion in serpentinite-hosted deep-sea hydrothermal vents
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Journal Article
Osmotic energy conversion in serpentinite-hosted deep-sea hydrothermal vents
2024
Overview
Cells harvest energy from ionic gradients by selective ion transport across membranes, and the same principle is recently being used for osmotic power generation from salinity gradients at ocean-river interfaces. Common to these ionic gradient conversions is that they require intricate nanoscale structures. Here, we show that natural submarine serpentinite-hosted hydrothermal vent (HV) precipitates are capable of converting ionic gradients into electrochemical energy by selective transport of Na
+
, K
+
, H
+
, and Cl
-
. Layered hydroxide nanocrystals are aligned radially outwards from the HV fluid channels, constituting confined nanopores that span millimeters in the HV wall. The nanopores change the surface charge depending on adsorbed ions, allowing the mineral to function as a cation- and anion-selective ion transport membrane. Our findings indicate that chemical disequilibria originating from flow and concentration gradients in geologic environments generate confined nanospaces which enable the spontaneous establishment of osmotic energy conversion.
Nakamura and colleagues show selective ion transport through mineral nanochannels in submarine hydrothermal vent (HV) precipitates, enabling HVs to convert ionic gradients into electrochemical energy, similar to cellular systems
