摘要
Fe3C-functionalized three-dimensional （3D） porous nitrogen-doped graphite carbon composites （Fe3C/ NG） were synthesized via a facile solution-based impreg- nation and pyrolysis strategy using the commercially available melamine foam and FeC13 as precursors. The structural characterizations confirmed that Fe3C nanoparticles with an average core size about 122 nm were assembled on the surface of the carbonized melamine foam （CMF） skeletons. The electrochemical measurements demonstrated the superior electrocatalytic activity of the advanced Fe3C/NG composite for hydrogen peroxide reduction reaction in 0.1 mol/L PBS electrolyte and the limit of detection of H2O2 is estimated to be 0.035 mmol/L at a signal-to-noise ratio of 3 with a wide linear detection range from 50 μmol/L to 15 mmol/L （R^2 = 0.999）. Compared with the pure CMF, the Fe3C/NG exhibited higher catalytic activity, more stable response, lower detection limit, higher selectivity and a wider detection range, which could be attributed to the synergic effect between the two types of active sites from the iron carbide species and the nitrogen-doped graphite carbon. Meanwhile, the large surface area, high conductivity and the improved mass transport from the 3D porous material can also promote the electrochemical sensing performance. Moreover, the Fe3C/ NG-based electrochemical sensor showed high anti-interference ability and stability for H2O2 detection. Thus, the novel and low-cost Fe3C/NG composite may be a prom- ising alternative to noble metals and offer potential appli- cations in various types of electrochemical sensors, bioelectronic devices and catalysts.
过氧化氢传感在疾病诊断、生物成像、人类反恐等方面有广泛应用.在传统的电化学传感器中,电极材料需要过氧化氢酶或贵金属材料的修饰,这不仅增加了电化学传感器的成本,也使得电极制备比较复杂.本文提出了一步高温煅烧的策略,制备了碳化铁功能化的三维氮掺杂碳材料(Fe3C/NG).由于该三维碳材料具有高比表面积、大孔容的特性,其对过氧化氢的电化学检测表现了高的灵敏度和选择性.因此,Fe3C/NG复合材料有望取代贵金属纳米材料,在生物传感器的构建方面具有潜在的应用前景.
基金
supported by the National Natural Science Foundation of China (21275136)
the Natural Science Foundation of Jilin Province (201215090)
