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Close-Packed Nanowire-Bacteria Hybrids for Efficient Solar-Driven CO2 Fixation

  • Author(s): Su, Y
  • Cestellos-Blanco, S
  • Kim, JM
  • Shen, YX
  • Kong, Q
  • Lu, D
  • Liu, C
  • Zhang, H
  • Cao, Y
  • Yang, P
  • et al.
Abstract

Bioelectrochemical CO2-reducing rate at high potential was limited by poor bacteria-nanowire interface resulting from an inhospitable alkaline local environment. Tuning the bulk electrolyte pH and increasing its buffering capacity mitigated this issue and supported the formation of a close-packed nanowire-bacteria cathode. The resulting close-packed biohybrid operated with a CO2-reducing current density of 0.65 ± 0.11 mA cm−2 at ∼−1.2 V versus standard hydrogen electrode and enabled solar-powered CO2 fixation with solar-to-acetate efficiency of ∼3.6% over 1 week.

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