State Key Laboratory of Bioelectronics, Southeast University , Nanjing 210096, People's Republic of China.
ACS Appl Mater Interfaces. 2015 Jan 14;7(1):400-8. doi: 10.1021/am506360x. Epub 2014 Dec 16.
A unique vertically oriented TiO2 nanosheets (TiO2-NSs) layer was synthesized in situ on the surface of a carbon paper (CP) electrode via hydrothermal synthesis upon addition of a suitable amount of activated carbon powders in a reactor. Field emission scanning electron microscopy images showed that the nanosheets were about 2 μm in length, 200-600 nm in width and 15 nm in thickness. X-ray diffraction and Raman patterns verified TiO2-NSs crystallized in the anatase phase. The electrochemical activities of CP and TiO2-NSs/CP electrode have been investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The maximum power output density of a mixed consortia inoculated microbial fuel cell was increased by 63% upon using TiO2-NSs/CP as a bioanode compared with that using bare CP as a bioanode. The performance improvement could be ascribed to unique 3D open porous interface made of vertically oriented TiO2-NSs, which provides good biocompatibility, favorable mass transport process, large surface areas for adhension of bacteria and direct pathways for electron movement to the electrode.
通过在反应器中加入适量的活性炭粉末，在碳纸（CP）电极表面原位通过水热合成合成了一层独特的垂直取向的 TiO2 纳米片（TiO2-NSs）层。场发射扫描电子显微镜图像显示，纳米片长约 2μm，宽 200-600nm，厚 15nm。X 射线衍射和拉曼图谱证实 TiO2-NSs 结晶为锐钛矿相。通过循环伏安法和电化学阻抗谱研究了 CP 和 TiO2-NSs/CP 电极的电化学活性。与使用裸 CP 作为生物阳极相比，使用 TiO2-NSs/CP 作为生物阳极的混合接种微生物燃料电池的最大功率输出密度提高了 63%。性能的提高可归因于由垂直取向的 TiO2-NSs 制成的独特的 3D 开放多孔界面，其提供了良好的生物相容性、有利的传质过程、有利于细菌附着的大表面积和电子直接流向电极的途径。
