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Harvesting waste thermal energy using a carbon-nanotube-based thermo-electrochemical cell

journal contribution
posted on 2010-03-10, 00:00 authored by R Hu, B Cola, N Haram, J Barisci, S Lee, S Stoughton, G Wallace, C Too, M Thomas, Adrian Gestos, M dela Cruz, J Ferraris, A Zakhidov, R Baughman
Low efficiencies and costly electrode materials have limited harvesting of thermal energy as electrical energy using thermo-electrochemical cells (or “thermocells”). We demonstrate thermocells, in practical configurations (from coin cells to cells that can be wrapped around exhaust pipes), that harvest low-grade thermal energy using relatively inexpensive carbon multiwalled nanotube (MWNT) electrodes. These electrodes provide high electrochemically accessible surface areas and fast redox-mediated electron transfer, which significantly enhances thermocell current generation capacity and overall efficiency. Thermocell efficiency is further improved by directly synthesizing MWNTs as vertical forests that reduce electrical and thermal resistance at electrode/substrate junctions. The efficiency of thermocells with MWNT electrodes is shown to be as high as 1.4% of Carnot efficiency, which is 3-fold higher than for previously demonstrated thermocells. With the cost of MWNTs decreasing, MWNT-based thermocells may become commercially viable for harvesting low-grade thermal energy.

History

Journal

Nano letters

Volume

10

Issue

3

Pagination

838 - 846

Publisher

American Chemical Society

Location

Washington, D. C.

ISSN

1530-6984

eISSN

1530-6992

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2010, American Chemical Society

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