Wood-based technology creates electricity from heat

UMD-Led researchers' wood-based technology creates electricity from heat
Credit: University of Maryland

A University of Maryland-led team of researchers has created a heat-to-electricity device that runs on ions and which could someday harness the body's heat to provide energy.

Led by UMD researchers Liangbing Hu, Robert Briber and Tian Li of the department of materials science, and Siddhartha Das of mechanical engineering, the team transformed a piece of wood into a flexible membrane that generates energy from the same type of electric current (ions) that the human body runs on. This energy is generated using charged channel walls and other unique properties of the wood's natural nanostructures. With this new wood-based technology, they can use a small temperature differential to efficiently generate ionic voltage, as demonstrated in a paper published March 25 in the journal Nature Materials.

If you've ever been outside during a lightning storm, you've seen that generating charge between two very different temperatures is easy. But for small temperature differences, it is more difficult. However, the team says they have succesfully tackled this challenge. Hu said they now have "demonstrated their proof-of-concept device, to harvest low-grade heat using nanoionic behavior of processed wood nanostructures".

Trees grow channels that move water between the roots and the leaves. These are made up of fractally-smaller channels, and at the level of a single cell, channels just nanometers or less across. The team has harnessed these channels to regulate ions.

The researchers used basswood, which is a fast-growing tree with low environmental impact. They treated the wood and removed two components—lignin, that makes the wood brown and adds strength, and hemicellulose, which winds around the layers of cells binding them together. This gives the remaining cellulose its signature flexibility. This process also converts the structure of the cellulose from type I to type II which is a key to enhancing ion conductivity.

A membrane, made of a thin slice of , was bordered by platinum electrodes, with sodium-based electrolyte infiltrated into the cellulose. The regulate the ion flow inside the tiny channels and generate electrical signal. "The charged walls can establish an that appears on the nanofibers and thus help effectively regulate ion movement under a thermal gradient," said Tian Li, first author of the paper. .

Li—who was named as one of Forbes "30 Under 30" in Energy in 2018—said that the in the electrolyte insert into the aligned channels, which is made possible by the crystal structure conversion of cellulose and by dissociation of the surface .

"We are the first to show that, this type of membrane, with its expansive arrays of aligned cellulose, can be used as a high-performance ion selective membrane by nanofluidics and molecular streaming and greatly extends the applications of sustainable into nanoionics," said Li summing up their paper.


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More information: Tian Li et al, Cellulose ionic conductors with high differential thermal voltage for low-grade heat harvesting, Nature Materials (2019). DOI: 10.1038/s41563-019-0315-6
Journal information: Nature Materials

Citation: Wood-based technology creates electricity from heat (2019, March 25) retrieved 20 June 2019 from https://phys.org/news/2019-03-wood-based-technology-electricity.html
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Mar 25, 2019
We have awful lot of heat in Volcanoes and Hot Springs !

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