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Electricity-powered artificial root nodule.


ABSTRACT: Root nodules are agricultural-important symbiotic plant-microbe composites in which microorganisms receive energy from plants and reduce dinitrogen (N2) into fertilizers. Mimicking root nodules using artificial devices can enable renewable energy-driven fertilizer production. This task is challenging due to the necessity of a microscopic dioxygen (O2) concentration gradient, which reconciles anaerobic N2 fixation with O2-rich atmosphere. Here we report our designed electricity-powered biological|inorganic hybrid system that possesses the function of root nodules. We construct silicon-based microwire array electrodes and replicate the O2 gradient of root nodules in the array. The wire array compatibly accommodates N2-fixing symbiotic bacteria, which receive energy and reducing equivalents from inorganic catalysts on microwires, and fix N2 in the air into biomass and free ammonia. A N2 reduction rate up to 6.5 mg N2 per gram dry biomass per hour is observed in the device, about two orders of magnitude higher than the natural counterparts.

SUBMITTER: Lu S 

PROVIDER: S-EPMC7083970 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Electricity-powered artificial root nodule.

Lu Shengtao S   Guan Xun X   Liu Chong C  

Nature communications 20200320 1


Root nodules are agricultural-important symbiotic plant-microbe composites in which microorganisms receive energy from plants and reduce dinitrogen (N<sub>2</sub>) into fertilizers. Mimicking root nodules using artificial devices can enable renewable energy-driven fertilizer production. This task is challenging due to the necessity of a microscopic dioxygen (O<sub>2</sub>) concentration gradient, which reconciles anaerobic N<sub>2</sub> fixation with O<sub>2</sub>-rich atmosphere. Here we report  ...[more]

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