Hollow-spherical Co/N-C nanoparticle as an efficient electrocatalyst used in air cathode microbial fuel cell

• DOI: 10.1016/j.bios.2016.06.032
• Publication Date: 2016-06-18T08:19:22Z
• Authors: Tingting Yang; Kexun Li; Liangtao Pu; Ziqi Liu; Baochao Ge; Yajun Pan; Ying Liu
• Keywords: Sewage; Bioelectric Energy Sources; Nanotubes, Carbon; Nitrogen; Metal Nanoparticles; Reproducibility of Results; Cobalt; Equipment Design; Sensitivity and Specificity; 7. Clean energy; 01 natural sciences; Catalysis; 0104 chemical sciences; Equipment Failure Analysis; Nanopores; Energy Transfer; Electrodes; Nanospheres

The hollow-spherical Co/N-C nanoparticle, which is synthesized via a simple hydrothermal reaction followed by heat treatment, is firstly used as electrocatalyst for oxygen reduction reaction (ORR) in air-cathode microbial fuel cell (MFC). The maximum power density of MFC with 10% Co/N-C air-cathode is as high as 2514±59mWm(-2), which is almost 174% higher than the control. The exchange current density (i0) of cathode equipped with 10% Co/N-C is 238% higher than that of untreated AC. While the total resistance of treated samples decreases from 13.017 to 10.255Ω. The intensity ratio of Raman D to G band (ID/IG) decreases from 0.93 (N-C) to 0.73 (Co/N-C), indicating the catalyst forms graphite structure. Both XRD and XPS testify that Co is bonded to N within graphitic sheets and serves as the active sites in ORR. The four-electron pathway of the Co/N-C also plays a crucial role in electrochemical catalytic activity. As a result, it can be expected that the as-synthesized Co/N-C, with extraordinary electro-catalytic performance towards ORR, will be a promising alternative to the state-of-the-art non-precious metal ORR electro-catalysts for electrochemical energy applications.