Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, Guangdong Province 510650, China.
Bioresour Technol. 2013 Sep;144:115-20. doi: 10.1016/j.biortech.2013.06.075. Epub 2013 Jun 27.
Sewage sludge (SS) biochars have been prepared under an inert atmosphere at different temperatures. Morphologic and chemical analyses reveal that the surface of the biochar carbonized at 900°C (SS900) has more abundant micropores, and higher nitrogen and iron contents as compared to those carbonized at 500 (SS500) and 700°C (SS700). The electrochemical analyses display that the prepared biochars are active for catalyzing oxygen reduction reaction (ORR). However, more positive peak potential and larger peak current of ORR are found using the SS900 as compared to the SS500 and SS700. In MFCs, the maximum power density of 500±17 mW m(-2) was obtained from the SS900 cathode, which is comparable to the Pt cathode. The proposed cathode exhibited good stability and great tolerance to methanol. Given these results, it is expected that the SS-derived biochar cathode can find application in fuel cell systems.
污水污泥（SS）生物炭是在不同温度下于惰性气氛中制备的。形貌和化学分析表明，与在 500°C（SS500）和 700°C（SS700）碳化的生物炭相比，在 900°C（SS900）碳化的生物炭的表面具有更丰富的微孔，以及更高的氮和铁含量。电化学分析表明，所制备的生物炭对氧还原反应（ORR）具有活性。然而，与 SS500 和 SS700 相比，使用 SS900 作为催化剂时，ORR 的正向峰电位和峰值电流更大。在 MFC 中，SS900 阴极获得了 500±17 mW m(-2) 的最大功率密度，可与 Pt 阴极相媲美。所提出的阴极表现出良好的稳定性和对甲醇的高耐受性。鉴于这些结果，预计 SS 衍生的生物炭阴极可以在燃料电池系统中得到应用。
