A facile
and efficient method to prepare boron and nitrogen codoped
porous carbon foam (BNPC) derived from starch with urea as nitrogen
source and boric acid as both boron source and templet is presented.
The codoping strategy can boost the synergistically doping amounts
of boron and nitrogen, which can achieve a great increase in the doping
efficiency of boron (three times higher than single boron doping)
and nitrogen. Due to its hierarchical pore structure with moderate
specific surface and relatively high nitrogen (9.38 at. %) and boron
(3.87 at. %), the BNPC electrode exhibits outstanding electrochemical
performances with an ultrahigh specific capacity of 402 F g–1 at a current density of 0.5 A g–1 and retains
266 F g–1 even at a current density of 20 A g–1 in 6 M KOH electrolyte. In addition, a symmetric
device based on BNPC electrodes delivers a respectable energy density
of 21.9 Wh kg–1 in 1 M Na2SO4 electrolyte. Therefore, this work provides a simple and efficient
method to synthesize heteroatom-doped hierarchical porous carbon materials
for advanced energy storage systems.
The voltage is the critical electrochemical parameter in microbial fuel cells (MFCs).There are three major oilfield wastewaters including water flooding produced water, polymer flooding produced water and ASP flooding produced water. These three wastewaters were used as anode substrate of three MFCs in this study. The influence and the influencing factors of the output voltage of the three MFCs and the produced water main refractory organics removal effect were studied. The results show that During this reaction period, MFCs cathode potential stays relative stable, however, anode potential shows a remarkable increasing trend, thus, the anode contributes mostly to the change in output voltage. COD removal effect of Anode substrate and the coulombic efficiency are both influencing factors of the anode potential .The microbial fuel cell for wastewater of surfactant, remove the best effect;For different produced water, oil and polymer removal effect abide by the MFC output voltage and COD value changing law.
One of the most promising applications of MFC is to use them treating organic wastes while accomplishing power generation. In this study, the effects of different electrode sizes on electricity generation performance and COD removal were investigated in dual chambered MFC. It was found that the maximum power density of S-MFC (the electrode anode size is 74.5 cm2) and L-MFC (the electrode anode size is 77.67 cm2), with the external resistor was 300Ω, were 0.23mW/cm2 and 0.41mW/cm2, respectively. In the period of 0~400 h operation, the S-MFC reached the maximum voltage 71.5 mV in 308 hours with the maximum current 186.2 μA, while the L-MFC reached the maximum voltage 97.9 mV in 184 hours with the current 271.3 μA. Moreover, the anode solution COD removal of S-MFC ranged from 1.66% to 6.87% using Ag+ solution as the cathode and the anode solution COD removal in the L-MFC varied from 7.21% to 14.86%.
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