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<p>Au nanoparticles–composite TiO<sub>2</sub> nanowires (NWs) modified carbon paper (CP) anode was synthesized via the hydrothermal method. Field emission scanning electron microscopy (FESEM) images demonstrate that the modified nanocomposite electrode features a rough and bumpy surface structure. The electrochemical activities of TiO<sub>2</sub>–Au/CP and the control electrodes (TiO<sub>2</sub>–NWs/CP, Au/CP, CP) for microbial fuel cell (MFC) are investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). When using TiO<sub>2</sub>–Au/CP as a bioanode, the maximum power output density of <i>Shewanella loihica</i> PV-4 inoculated MFC increases by 49.7%, 26.5% and 190.6% compared with that when using TiO<sub>2</sub>–NWs/CP, Au/CP and bare CP as bioanodes, respectively. CV analysis indicates that TiO<sub>2</sub>–Au mediates direct and indirect electron transfer between the electrode and the bacteria, as evidenced by the appearance of redox peaks with mid-point potentials <i>E</i><sub>m</sub> of − 0.305&#xa0;V and −0.465&#xa0;V, respectively. The generation of bioelectricity reveals the formation of a biofilm on the electrode surface. Furthermore, compared with the control electrodes, the MFC assembled with a TiO<sub>2</sub>–Au anode exhibits a smaller semicircle in the high-frequency region, representing a lower charge transfer resistance (<i>R</i><sub>ct</sub>). The improvement in MFC performance can be attributed to the fact that the combination of TiO<sub>2</sub> and Au enhances the conductivity and electrochemical activity of the electrode, along with its good biocompatibility and large specific surface area, which are favorable for bacterial colonization. Thus, TiO<sub>2</sub>–Au/CP serves as an ideal anode material featuring simple synthesis. Additionally, its surface modifier, TiO<sub>2</sub>–Au can be extended for the modification of other base electrodes, enabling the acquisition of high-quality anodes for MFCs.</p>

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Carbon paper anodes decorated with TiO2 nanowires and Au nanoparticles for facilitating bacterial extracellular electron transfer

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Zhixing Qiao,
  • Xiaoyu Dong,
  • Tong Yang,
  • Lichen Hu,
  • Tao Yin

摘要

Au nanoparticles–composite TiO2 nanowires (NWs) modified carbon paper (CP) anode was synthesized via the hydrothermal method. Field emission scanning electron microscopy (FESEM) images demonstrate that the modified nanocomposite electrode features a rough and bumpy surface structure. The electrochemical activities of TiO2–Au/CP and the control electrodes (TiO2–NWs/CP, Au/CP, CP) for microbial fuel cell (MFC) are investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). When using TiO2–Au/CP as a bioanode, the maximum power output density of Shewanella loihica PV-4 inoculated MFC increases by 49.7%, 26.5% and 190.6% compared with that when using TiO2–NWs/CP, Au/CP and bare CP as bioanodes, respectively. CV analysis indicates that TiO2–Au mediates direct and indirect electron transfer between the electrode and the bacteria, as evidenced by the appearance of redox peaks with mid-point potentials Em of − 0.305 V and −0.465 V, respectively. The generation of bioelectricity reveals the formation of a biofilm on the electrode surface. Furthermore, compared with the control electrodes, the MFC assembled with a TiO2–Au anode exhibits a smaller semicircle in the high-frequency region, representing a lower charge transfer resistance (Rct). The improvement in MFC performance can be attributed to the fact that the combination of TiO2 and Au enhances the conductivity and electrochemical activity of the electrode, along with its good biocompatibility and large specific surface area, which are favorable for bacterial colonization. Thus, TiO2–Au/CP serves as an ideal anode material featuring simple synthesis. Additionally, its surface modifier, TiO2–Au can be extended for the modification of other base electrodes, enabling the acquisition of high-quality anodes for MFCs.