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首页> 外文期刊>RSC Advances >Electrochemically synthesized sulfur-doped graphene as a superior metal-free cathodic catalyst for oxygen reduction reaction in microbial fuel cells
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Electrochemically synthesized sulfur-doped graphene as a superior metal-free cathodic catalyst for oxygen reduction reaction in microbial fuel cells

机译：电化学合成的硫掺杂石墨烯，可作为微生物燃料电池中氧还原反应的优良无金属阴极催化剂

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Platinum nanoparticles (PtNPs) have long been regarded as the benchmark catalyst for the oxygen reduction reaction (ORR) in the cathode of microbial fuel cells (MFCs). On the other hand, the practical applications of these catalysts are limited by the high cost and scarcity of Pt. Therefore, developing an alternative catalyst to PtNPs for efficient ORR activity is essential for meeting the future demands for practical applications in MFCs. In this study, sulfur-doped graphene (S-GN) was synthesized via the environmental friendly, economical and facile one pot electrochemical exfoliation of graphene in a unique combination of electrolytes, which both catalyzed the exfoliation reaction and acted a sulfur source. The initial activity of S-GN as an ORR active catalyst was examined by cyclic voltammetry (CV), which showed that the as-synthesized S-GN exhibited better ORR activity than the plain material. Furthermore, the application of S-GN as a cathode material was also studied in MFCs. The results showed that the MFC equipped with the S-GN cathode produced a maximum power density of 51.22 +/- 6.01 mW m(-2), which is 1.92 +/- 0.34 times higher than that of Pt/C. The excellent performance of S-GN as a cathode catalyst in MFCs could be due to the doping of graphene with heteroatoms, which increased the surface area and improved the conductivity of graphene through a range of interactions. Based on the above MFC performance, the as-synthesized S-GN catalyst could help reduce the cost and scale up the design of MFCs for practical applications in the near future.
机译：长期以来，铂纳米颗粒（PtNPs）被认为是微生物燃料电池（MFCs）阴极中氧还原反应（ORR）的基准催化剂。另一方面，这些催化剂的实际应用受到Pt的高成本和稀缺性的限制。因此，为满足MFCs实际应用的未来需求，开发有效的ORR活性的PtNPs替代催化剂至关重要。在这项研究中，掺杂硫的石墨烯（S-GN）是通过在一种独特的电解质组合中通过对石墨烯进行环保，经济和便捷的一锅电化学剥落而合成的，既可以催化剥落反应，又可以充当硫源。通过循环伏安法（CV）检验了S-GN作为ORR活性催化剂的初始活性，这表明合成后的S-GN表现出比普通材料更好的ORR活性。此外，还在MFC中研究了S-GN作为阴极材料的应用。结果表明，配备有S-GN阴极的MFC产生的最大功率密度为51.22 +/- 6.01 mW m（-2），是Pt / C的1.92 +/- 0.34倍。 S-GN在MFC中作为阴极催化剂的出色性能可能归因于石墨烯中杂原子的掺杂，从而通过一系列相互作用增加了石墨烯的表面积并提高了其导电性。基于上述MFC的性能，合成后的S-GN催化剂可帮助降低成本并在不久的将来扩大MFC的设计以用于实际应用。

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