State Key Laboratory of Urban Water Resource and Environment, 73 Huanghe Road, Nangang District, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, 73 Huanghe Road, Nangang District, Harbin 150090, China.
Biosens Bioelectron. 2012 May 15;35(1):413-415. doi: 10.1016/j.bios.2011.08.030. Epub 2011 Aug 30.
Because of the advantages of low cost, good electrical conductivity and high oxidation resistance, nitrogen-doped carbon (NDC) materials have a potential to replace noble metals in microbial fuel cells (MFCs) for wastewater treatment. In spite of a large volume of studies on NDC materials as catalysts for oxygen reduction reaction, the influence of sulfide on NDC materials has not yet been explicitly reported so far. In this communication, nitrogen-doped carbon powders (NDCP) were prepared by treating carbon powders in nitric acid under reflux condition. Sodium sulfide (Na(2)S) was added to the cathodic electrolyte to compare its effects on platinum (Pt) and NDCP cathodes. Cell voltages, power density and cathodic potentials were monitored without and with Na(2)S and after Na(2)S was removed. The maximum cell voltage of the MFCs with Pt cathode decreased by 10% in the presence of Na(2)S that did not change the performance of the MFC with NDCP cathode, and the maximum power density of the MFC with NDCP cathode was even 11.3% higher than that with Pt cathode (222.5 ± 8 mW m(-2) vs. 199.7 ± 4 mW m(-2)).
由于氮掺杂碳 (NDC) 材料具有低成本、良好的导电性和高抗氧化性等优点，因此有望在用于废水处理的微生物燃料电池 (MFC) 中替代贵金属。尽管已经有大量关于 NDC 材料作为氧还原反应催化剂的研究，但迄今为止，尚未明确报道过硫化物对 NDC 材料的影响。在本通讯中，通过在回流条件下将碳粉在硝酸中处理来制备氮掺杂碳粉 (NDCP)。向阴极电解液中添加硫化钠 (Na(2)S)，以比较其对铂 (Pt) 和 NDCP 阴极的影响。监测有无 Na(2)S 以及去除 Na(2)S 后电池电压、功率密度和阴极电位的变化。在存在 Na(2)S 的情况下，带有 Pt 阴极的 MFC 的最大电池电压降低了 10%，但这并未改变带有 NDCP 阴极的 MFC 的性能，并且带有 NDCP 阴极的 MFC 的最大功率密度甚至比带有 Pt 阴极的 MFC 高出 11.3%（222.5 ± 8 mW m(-2) 与 199.7 ± 4 mW m(-2)）。
