Characterization of Fe/N-doped graphene as air-cathode catalyst in microbial fuel cells

doi:10.1016/j.jechem.2017.07.019

摘要/Abstract

摘要： This work proposed a simple and efficient approach for synthesis of durable and efficient non-precious metal oxygen reduction reaction (ORR) electro-catalysts in MFCs. The rod-like carbon nanotubes (CNTs) were formed on the Fe-N/SLG sheets after a carbonization process. The maximum power density of 1210 ±23 mW·m^-2 obtained with Fe-N/SLG catalyst in an MFC was 10.7% higher than that of Pt/C catalyst (1080±20 mW·m^-2) under the same condition. The results of RDE test show that the ORR electron transfer number of Fe-N/SLG was 3.91 ±0.02, which suggested that ORR catalysis proceeds through a four-electron pathway. The whole time of the synthesis of electro-catalysts is about 10 h, making the research take a solid step in the MFC expansion due to its low-cost, high efficiency and favorable electrochemical performance. Besides, we compared the electrochemical properties of catalysts using SLG, high conductivity graphene (HCG, a kind of multilayer graphene) and high activity graphene (HAG, a kind of GO) under the same conditions, providing a solution for optimal selection of cathode catalyst in MFCs. The morphology, crystalline structure, elemental composition and ORR activity of these three kinds of Fe-N/C catalysts were characterized. Their ORR activities were compared with commercial Pt/C catalyst. It demonstrates that this kind of Fe-N/SLG can be a type of promising highly efficient catalyst and could enhance ORR performance of MFCs.

关键词: Microbial fuel cell, Graphene, Electrocatalysts, Power density, Oxygen reduction reaction

Abstract: This work proposed a simple and efficient approach for synthesis of durable and efficient non-precious metal oxygen reduction reaction (ORR) electro-catalysts in MFCs. The rod-like carbon nanotubes (CNTs) were formed on the Fe-N/SLG sheets after a carbonization process. The maximum power density of 1210 ±23 mW·m^-2 obtained with Fe-N/SLG catalyst in an MFC was 10.7% higher than that of Pt/C catalyst (1080±20 mW·m^-2) under the same condition. The results of RDE test show that the ORR electron transfer number of Fe-N/SLG was 3.91 ±0.02, which suggested that ORR catalysis proceeds through a four-electron pathway. The whole time of the synthesis of electro-catalysts is about 10 h, making the research take a solid step in the MFC expansion due to its low-cost, high efficiency and favorable electrochemical performance. Besides, we compared the electrochemical properties of catalysts using SLG, high conductivity graphene (HCG, a kind of multilayer graphene) and high activity graphene (HAG, a kind of GO) under the same conditions, providing a solution for optimal selection of cathode catalyst in MFCs. The morphology, crystalline structure, elemental composition and ORR activity of these three kinds of Fe-N/C catalysts were characterized. Their ORR activities were compared with commercial Pt/C catalyst. It demonstrates that this kind of Fe-N/SLG can be a type of promising highly efficient catalyst and could enhance ORR performance of MFCs.

Key words: Microbial fuel cell, Graphene, Electrocatalysts, Power density, Oxygen reduction reaction

Dingling Wang, Zhaokun Ma, Yang'en Xie, Huaihe Song. Characterization of Fe/N-doped graphene as air-cathode catalyst in microbial fuel cells[J]. 能源化学(英文), 2017, 26(6): 1187-1195.

Dingling Wang, Zhaokun Ma, Yang'en Xie, Huaihe Song. Characterization of Fe/N-doped graphene as air-cathode catalyst in microbial fuel cells[J]. Journal of Energy Chemistry, 2017, 26(6): 1187-1195.

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