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<p>The integration of microbial nitrogen (N<sub>2</sub>) fixation with photochemical processes using inorganic light-absorbing nanomaterials is a burgeoning field in sustainable energy production. Here, we explore the synergistic combination of inorganic semiconductor nanowires (NWs) with whole-cell microorganisms to create an inorganic-bacterial biohybrid system. Specifically, we employ Cu<sub>2</sub>O@TiO<sub>2</sub> NWs with a core/shell structure to harness sunlight and generate photoexcited electrons. <i>Azotobacter vinelandii</i>, serving as a biocatalyst, adsorbs onto these NWs and facilitates the reception of photoexcited electrons, thereby enhancing the efficiency of the photoelectrochemical N<sub>2</sub> fixation reaction (PEC-NRR). The biohybrid system achieves an impressive ammonia (NH<sub>3</sub>) yield of (1.49 ± 0.05) × 10<sup>-9 </sup> mol s<sup>-1</sup> cm<sup>-2</sup> (5.36 ± 0.18 μmol h<sup>-1</sup> cm<sup>-2</sup>). The enhancement in NH<sub>3</sub> synthesis within the Cu<sub>2</sub>O@TiO<sub>2</sub> NWs/<i>A. vinelandii</i> biohybrid is attributed to the increased concentrations of nicotinamide adenine dinucleotide-hydrogen (NADH) and adenosine 5’-triphosphate (ATP), as well as the overexpression of N<sub>2</sub>-fixing genes like <i>nif</i>H and <i>nif</i>D within the nitrogenase enzyme complex. This study underscores the potential of inorganic-bacterial biohybrid systems in solar-chemical conversion, paving the way for more diverse and functional approaches to harnessing solar energy for sustainable chemical production.</p>

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Inorganic-bacterial biohybrids for efficient solar-driven nitrogen fixation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Xue Zhou,
  • Dan Wu,
  • Yingjie Zhang,
  • Tianhang Feng,
  • Wenming Zhang,
  • Zhonghai Zhang

摘要

The integration of microbial nitrogen (N2) fixation with photochemical processes using inorganic light-absorbing nanomaterials is a burgeoning field in sustainable energy production. Here, we explore the synergistic combination of inorganic semiconductor nanowires (NWs) with whole-cell microorganisms to create an inorganic-bacterial biohybrid system. Specifically, we employ Cu2O@TiO2 NWs with a core/shell structure to harness sunlight and generate photoexcited electrons. Azotobacter vinelandii, serving as a biocatalyst, adsorbs onto these NWs and facilitates the reception of photoexcited electrons, thereby enhancing the efficiency of the photoelectrochemical N2 fixation reaction (PEC-NRR). The biohybrid system achieves an impressive ammonia (NH3) yield of (1.49 ± 0.05) × 10-9  mol s-1 cm-2 (5.36 ± 0.18 μmol h-1 cm-2). The enhancement in NH3 synthesis within the Cu2O@TiO2 NWs/A. vinelandii biohybrid is attributed to the increased concentrations of nicotinamide adenine dinucleotide-hydrogen (NADH) and adenosine 5’-triphosphate (ATP), as well as the overexpression of N2-fixing genes like nifH and nifD within the nitrogenase enzyme complex. This study underscores the potential of inorganic-bacterial biohybrid systems in solar-chemical conversion, paving the way for more diverse and functional approaches to harnessing solar energy for sustainable chemical production.