Santoro Carlo, Kodali Mounika, Kabir Sadia, Soavi Francesca, Serov Alexey, Atanassov Plamen
Department of Chemical and Biological Engineering, Center Micro-Engineered Materials (CMEM), MSC01 1120 University of New Mexico, Albuquerque, NM, 87131, USA.
Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum Universita' di Bologna, Via Selmi 2, 40126, Bologna, Italy.
J Power Sources. 2017 Jul 15;356:371-380. doi: 10.1016/j.jpowsour.2017.03.135.
Three-dimensional graphene nanosheets (3D-GNS) were used as cathode catalysts for microbial fuel cells (MFCs) operating in neutral conditions. 3D-GNS catalysts showed high performance towards oxygen electroreduction in neutral media with high current densities and low hydrogen peroxide generation compared to activated carbon (AC). 3D-GNS was incorporated into air-breathing cathodes based on AC with three different loadings (2, 6 and 10 mgcm). Performances in MFCs showed that 3D-GNS had the highest performances with power densities of 2.059 ± 0.003 Wm, 1.855 ± 0.007 Wm and 1.503 ± 0.005 Wm for loading of 10, 6 and 2 mgcm respectively. Plain AC had the lowest performances (1.017 ± 0.009 Wm). The different cathodes were also investigated in supercapacitive MFCs (SC-MFCs). The addition of 3D-GNS decreased the ohmic losses by 14-25%. The decrease in ohmic losses allowed the SC-MFC with 3D-GNS (loading 10 mgcm) to have the maximum power (P) of 5.746 ± 0.186 Wm. At 5 mA, the SC-MFC featured an "apparent" capacitive response that increased from 0.027 ± 0.007 F with AC to 0.213 ± 0.026 F with 3D-GNS (loading 2 mgcm) and further to 1.817 ± 0.040 F with 3D-GNS (loading 10 mgcm).
三维石墨烯纳米片（3D-GNS）被用作在中性条件下运行的微生物燃料电池（MFC）的阴极催化剂。与活性炭（AC）相比，3D-GNS催化剂在中性介质中对氧电还原表现出高性能，具有高电流密度和低过氧化氢生成量。3D-GNS以三种不同负载量（2、6和10 mg/cm²）掺入基于AC的空气阴极中。MFC中的性能表明，对于负载量分别为10、6和2 mg/cm²的情况，3D-GNS具有最高性能，功率密度分别为2.059±0.003 W/m²、1.855±0.007 W/m²和1.503±0.005 W/m²。普通AC的性能最低（1.017±0.009 W/m²）。还对超级电容微生物燃料电池（SC-MFC）中的不同阴极进行了研究。添加3D-GNS使欧姆损耗降低了14 - 25%。欧姆损耗的降低使具有3D-GNS（负载量10 mg/cm²）的SC-MFC具有5.746±0.186 W/m²的最大功率（P）。在5 mA时，SC-MFC具有“表观”电容响应，从AC时的0.027±0.007 F增加到3D-GNS（负载量2 mg/cm²）时的0.213±0.026 F，并进一步增加到3D-GNS（负载量10 mg/cm²）时的1.817±0.040 F。
