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This study demonstrates a bioelectrochemical concentration cell based on ion gradients in the plant root environment. Lettuce grown in panoponics generated bioelectric potentials (BEP) of ~70 mV initially, increasing to 200 mV as roots developed. The work reveals that nitrate form of nitrogen is critical for sustained potential generation, with classic Knop's solution (nitrate-based) producing maximum BEP of 170 mV (average 125 mV), while ammonium and organic nitrogen forms yielded significantly lower potentials. This represents a novel approach to harvesting electrical energy from plant–rhizosphere electrochemical processes.

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Abstract

The experimental bioelectrochemical current source based on the concentration gradient of charge carriers in the root environment of plants has been created. A potential difference of about 70 mV is observed in the nutrient solution. It is gradually decreasing due to equalization of concentrations. The voltage increases to 200 mV when plant are placed in a cultivation system as the root system develops due to the intensification of diffusion processes. The potential-forming role of nitrate forms of nitrogen is shown on the example of lettuce grown according to the panoponics technology. The separation of electrical charges by the root system during the life of plants can become an alternative source of green energy. Keywords: rhizosphere, bioelectric potential, panoponics, green energy.

Keywords

RhizospherePotential gradientDiffusionConcentration gradientRoot systemNitrate

Identifiers

DOI
10.21883/tpl.2022.04.53176.19066
Journal
Technical Physics Letters
Year
2022