Abstract
The presence of iron(Fe)has been found to favor power generation in microbial fuel cells(MFCs).To achieve long-term power production in MFCs,it is crucial to effectively tailor the release of Fe ions over extended operating periods.In this study,we developed a composite anode(A/IF)by coating iron foam with cellulose-based aerogel.The concentration of Fe ions in the anode solution of A/IF anode reaches 0.280 μg/mL(Fe2+vs.Fe3+=61％:39％)after 720 h of aseptic primary cell operation.This value was significantly higher than that(0.198 μg/mL,Fe2+vs.Fe3+=92％:8％)on uncoated iron foam(IF),indicating a continuous release of Fe ions over long-term operation.Notably,the resulting MFCs hybrid cell exhibited a 23％reduction in Fe ion concentration(compared to a 47％reduction for the IF anode)during the sixth testing cycle(600-720 h).It achieved a high-power density of 301±55 mW/m2 at 720 h,which was 2.62 times higher than that of the IF anode during the same period.Furthermore,a sedimentary microbial fuel cell(SMFCs)was constructed in a marine environment,and the A/IF anode demonstrated a power density of 103±3 mW/m2 at 3240 h,representing a 75％improvement over the IF anode.These findings elucidate the significant enhancement in long-term power production performance of MFCs achieved through effective tailoring of Fe ions release during operation.
维普
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