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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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Power generation from ambient humidity using protein nanowires.

Xiaomeng Liu¹, Hongyan Gao¹, Joy E Ward²

¹Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, USA.

|February 19, 2020

Summary

Researchers developed a new method for continuous electricity generation using protein wires from Geobacter sulfurreducens. This sustainable energy harvesting technology utilizes ambient moisture, offering a location-independent power source.

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Area of Science:

Materials Science
Biotechnology
Sustainable Energy

Background:

Existing environmental energy harvesting technologies (solar, thermoelectric, mechanical) have limitations in deployment and continuous power generation.
Current moisture-based energy harvesting methods produce only intermittent power due to a lack of sustained conversion mechanisms.

Purpose of the Study:

To demonstrate a novel method for continuous electric power generation from ambient moisture.
To introduce thin-film devices made from protein wires as a viable solution for sustainable energy harvesting.

Main Methods:

Fabrication of thin-film devices using nanometre-scale protein wires from the microbe Geobacter sulfurreducens.
Characterization of power generation capabilities in ambient environmental conditions.
Analysis of the mechanism driving continuous energy production.

Main Results:

The protein wire devices continuously generated electric power in ambient air.
A sustained voltage of approximately 0.5 volts and a current density of 17 microamperes per square centimetre were achieved with a 7-micrometre-thick film.
A self-maintained moisture gradient within the film was identified as the driving force for energy generation.

Conclusions:

Thin-film devices made from Geobacter sulfurreducens protein wires can generate continuous electricity from ambient humidity.
This technology offers a sustainable energy harvesting strategy with fewer location and environmental restrictions compared to existing methods.
Linear scaling of devices can increase voltage and current to power electronic devices.