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The accelerating carbon dioxide fixation of R. palustris under dark condition by iron nitride nanoarrays increasing electroactive bacteria outward extracellular electrons transfer in bioelectrochemical system

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  • Zou, Jixiang
  • Yuan, Zhishuai
  • Hua, Liangmiao
  • Bi, Lina
  • Guo, Chongshen
  • Yan, Mei

Abstract

An EET-CO2-fixation system was constructed, where carbon cloth with Fe2N nanoarrays grown in situ on its surface (Fe2N-CC) was employed as the anode for enriching electrochemically active bacteria (EAB, 96.327 %) and enhancing outward extracellular electron transfer (EET), while R. palustris adhered to the cathode for CO2 fixation. The electrons transferred by EET on the Fe2N-CC anode under dark conditions were found to provide more ATP and reducing power to the R. palustris for cathodic CO2 fixation in the system, in which the proliferation level of R. palustris was comparable to the photoautotrophy. Furthermore, experiments and DFT calculations confirmed that Fe2N nanoarrays can accelerate the direct electron transfer with more proteins in extracellular polymorphic substances, nanowires, c-type cytochromes, and Fe3+/Fe2+, as well as facilitate indirect electron transfer by secreting riboflavin and naphthoquinone. This system can provide new ideas for photosynthetic bacteria to achieve all-weather biological carbon sequestration.

Suggested Citation

  • Zou, Jixiang & Yuan, Zhishuai & Hua, Liangmiao & Bi, Lina & Guo, Chongshen & Yan, Mei, 2026. "The accelerating carbon dioxide fixation of R. palustris under dark condition by iron nitride nanoarrays increasing electroactive bacteria outward extracellular electrons transfer in bioelectrochemical system," Renewable Energy, Elsevier, vol. 256(PF).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pf:s0960148125020221
    DOI: 10.1016/j.renene.2025.124358
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    1. Michael S. Guzman & Karthikeyan Rengasamy & Michael M. Binkley & Clive Jones & Tahina Onina Ranaivoarisoa & Rajesh Singh & David A. Fike & J. Mark Meacham & Arpita Bose, 2019. "Phototrophic extracellular electron uptake is linked to carbon dioxide fixation in the bacterium Rhodopseudomonas palustris," Nature Communications, Nature, vol. 10(1), pages 1-13, December.
    2. Shuwei Li & Young Eun Song & Jiyun Baek & Hyeon Sung Im & Mutyala Sakuntala & Minsoo Kim & Chulhwan Park & Booki Min & Jung Rae Kim, 2020. "Bioelectrosynthetic Conversion of CO 2 Using Different Redox Mediators: Electron and Carbon Balances in a Bioelectrochemical System," Energies, MDPI, vol. 13(10), pages 1-13, May.
    3. Phuc T. Ha & Stephen R. Lindemann & Liang Shi & Alice C. Dohnalkova & James K. Fredrickson & Michael T. Madigan & Haluk Beyenal, 2017. "Syntrophic anaerobic photosynthesis via direct interspecies electron transfer," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
    4. Samuel H. Light & Lin Su & Rafael Rivera-Lugo & Jose A. Cornejo & Alexander Louie & Anthony T. Iavarone & Caroline M. Ajo-Franklin & Daniel A. Portnoy, 2018. "A flavin-based extracellular electron transfer mechanism in diverse Gram-positive bacteria," Nature, Nature, vol. 562(7725), pages 140-144, October.
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