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COLLEGE PARK -- Researchers at the University of Maryland have created a heat-to-electricity device that runs on ions that could someday harness the body’s heat to provide energy.
Liangbing Hu and Robert Briber of the department of materials science, and Siddhartha Das of mechanical engineering, 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. Hu, Briber and Das 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 wood, 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 channel walls can establish an electrical field that appears on the nanofibers and thus help effectively regulate ion movement under a thermal gradient,” said Tian Li, the first author of the paper.
Li said that the sodium ions 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 functional groups.
“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 cellulose into nanoionics,” Li summed up the paper.
This latest work builds on, and adds to, extensive previous UMD research to develop novel and potentially high impact applications of modified wood.
UMD Researchers Create Super Wood Stronger Than Most Metals (Feb. 2018)
Wood Windows are Cooler than Glass (June 2013)
A Battery Made of Wood? (August 2016)
Cellulose ionic conductors with high differential thermal voltage for low-grade heat harvesting
Tian Li, Xin Zhang, Steven D. Lacey, Ruiyu Mi, Xinpeng Zhao, Feng Jiang, Jianwei Song, Zhongqi Liu, Guang Chen, Jiaqi Dai, Yonggang Yao, Siddhartha Das, Ronggui Yang, Robert Briber, and Liangbing Hu
Nature Materials (2019) https://doi.org/10.1038/s41563-019-0315-6
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March 25, 2019
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