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Growth of Carbon Nanotubes on Graphene as 3D Biocathode for NAD+/NADH Balance Model and High-Rate Production in Microbial Electrochemical Synthesis from CO2

Abstract

Design and synthesis of three-dimensional (3D) structured carbon nanomaterials for achieving high-performance for reducing carbon dioxide to multicarbon, extracellular organic compounds in microbial electrochemical synthesis (MES). Here, we report the efficiency of 3D architected GN-CNTs hybrid as MES electrodes and stated the mechanism from the metabonomics with NAD+/NADH balance model in metabolic pathway. Under 3D structure conditions, the balance of NAD+/NADH in bacterial was disturbed. With NAD+/NADH pool changing, it can promote the transfer of extra electrons from the cathode to bacteria in order to generate NADH. Consequently, the excess NADH is used for CO2 fixation. Correspondingly, the resulted GN-CNTs hybrid showed adjustable electrochemical performance as a MES electrode. It allows for an enhanced interaction and electron transfer between biofilm and its nano-hierarchical structure. 4.4 and 5.0 fold higher current density and acetate production rate were reached on GN-CNTs modified electrode versus a carbon clothes control for the microbial reduction of carbon dioxide by C.ljungdahlii. Recovery of electrons consumed in acetate was70-80% for all electrodes. Importantly, the GN-CNT exhibited a high specific surface area of 344.17 m-2g-1, 3.2 fold higher than the unmodified electrode. This work paves a feasible pathway to prepare efficient carbon nanomaterial with highly conductive 3D architecture cathode and high performance for energy storage and conversion in MES. It’s also an attempt to make the nanomaterial an extremely efficient material from an engineering perspective for enhancing the bacteria-electrode interaction and microbial extracellular electron transfer.

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Publication details

The article was received on 31 Oct 2018, accepted on 06 Dec 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10465D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Growth of Carbon Nanotubes on Graphene as 3D Biocathode for NAD+/NADH Balance Model and High-Rate Production in Microbial Electrochemical Synthesis from CO2

    S. Han, H. Liu, C. C. Zhou and H. Ying, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10465D

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