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Improving the efficiency of harvesting electricity from living trees
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The harvesting of environmental energy has been attracting more and more attention. In this study, it was observed that there exists electrical potential difference between the phloem of a living tree and the surrounding soil. This kind of bioelectricity is sustained and it can be harvested by charging a capacitor. However, the charging efficiency is greatly dependent on the shape of the electrodes which affects the contact resistance between the electrodes and the phloem significantly. Based on an equivalent circuit model, a method to improve the efficiency of electricity harvesting is proposed. The experimental data demonstrate that this method is feasible and effective.
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