Giant Thermoelectric Response of Nanofluidic Systems Driven by Water Excess Enthalpy

Abstract : Nanofluidic systems could in principle be used to produce electricity from waste heat, but current theoretical descriptions predict a rather poor performance as compared to thermoelectric solid materials. Here we investigate the thermoelectric response of NaCl and NaI solutions confined between charged walls, using molecular dynamics simulations. We compute a giant thermoelectric response, 2 orders of magnitude larger than the predictions of standard models. We show that water excess enthalpy—neglected in the standard picture—plays a dominant role in combination with the electro-osmotic mobility of the liquid-solid interface. Accordingly, the thermoelectric response can be boosted using surfaces with large hydrodynamic slip. Overall, the heat harvesting performance of the model systems considered here is comparable to that of the best thermoelectric materials, and the fundamental insight provided by molecular dynamics suggests guidelines to further optimize the performance, opening the way to recycle waste heat using nanofluidic devices.
Document type :
Journal articles
Complete list of metadatas

https://hal-univ-lyon1.archives-ouvertes.fr/hal-02367967
Contributor : Armelle Vidal <>
Submitted on : Monday, November 18, 2019 - 11:55:27 AM
Last modification on : Tuesday, November 19, 2019 - 2:38:44 AM

Links full text

Identifiers

Collections

Citation

Li Fu, Laurent Joly, Samy Merabia. Giant Thermoelectric Response of Nanofluidic Systems Driven by Water Excess Enthalpy. Physical Review Letters, American Physical Society, 2019, 123 (13), ⟨10.1103/PhysRevLett.123.138001⟩. ⟨hal-02367967⟩

Share

Metrics

Record views

15