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首页> 外文期刊>ACS applied materials & interfaces >Synthesis of Iron Oxide/Partly Graphitized Carbon Composites as a High-Efficiency and Low-Cost Cathode Catalyst for Microbial Fuel Cells
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Synthesis of Iron Oxide/Partly Graphitized Carbon Composites as a High-Efficiency and Low-Cost Cathode Catalyst for Microbial Fuel Cells

机译：高效，低成本的微生物燃料电池阴极催化剂-氧化铁/部分石墨化碳复合材料的合成

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摘要

Waste cornstalks and pomelo skins are used as carbon resources for preparing nanocomposites of iron oxide and partly graphitized carbon (Fe,0.,/PGC-CS and Fe3O4/PGC-PS). The results showed that Fe3O4 with a face-centered cubic structure is uniformly dispersed on the skeleton of Fe3O4/GC, and the highest S_(BET) values of Fe3O4/PGC-CS (476.5 m~2 g~(-1)) and Fe3O4/PGC-PS (547.7 m~2 g~(-1)) are obtained at 1000 °C. The electrical conductivity and density of catalytic active sites are correspondingly improved by the introduction of Fe species. Microbial fuel cells (MFCs) with a mixed composite (Fe3O4/PGC-CS:Fe3O4/PGC-PS = 1:1) cathode (three-dimensional structures) generate the highest power density of 1502 ± 30 mW m~(-2) which is 26.01% higher than that of Pt/C (1192 ± 33 mW m~(-2)) and only declines by 7.12% after 18 cycles. The Fe3O4/PGC-CS cathode has the highest Coulombic efficiency (24.3 ± 0.7%). The Fe3O4/PGC composites exhibit high oxygen reduction reactivity, low charge transfer resistances, and long-term stability and can be used as a low-cost and high-efficiency catalyst for MFCs.
机译：废弃的玉米秸秆和柚皮被用作碳源，用于制备氧化铁和部分石墨化的碳（Fe，0。/ PGC-CS和Fe3O4 / PGC-PS）的纳米复合材料。结果表明，具有面心立方结构的Fe3O4均匀地分散在Fe3O4 / GC的骨架上，Fe3O4 / PGC-CS的S_（BET）值最高（476.5 m〜2 g〜（-1）），且在1000°C下得到Fe3O4 / PGC-PS（547.7 m〜2 g〜（-1））。通过引入Fe物种相应地提高了催化活性位的电导率和密度。具有混合复合材料（Fe3O4 / PGC-CS：Fe3O4 / PGC-PS = 1：1）的微生物燃料电池（MFC）（三维结构）产生的最高功率密度为1502±30 mW m〜（-2）比Pt / C（1192±33 mW m〜（-2））高26.01％，而在18个循环后仅下降7.12％。 Fe3O4 / PGC-CS阴极的库仑效率最高（24.3±0.7％）。 Fe3O4 / PGC复合材料表现出高的氧还原反应性，低的电荷转移阻力和长期稳定性，可以用作MFC的低成本和高效催化剂。

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