Mechanochemical Synthesis of Nitrogen-Doped and Sulfur-Doped Multilayer Graphene for Use in Bifunctional Oxygen Electrodes
Mechanochemical Synthesis of Nitrogen-Doped and Sulfur-Doped Multilayer Graphene for Use in Bifunctional Oxygen Electrodes
复制标题
用于双功能氧电极的氮掺杂和硫掺杂多层石墨烯的机械化学合成
DOI：
10.1149/1945-7111/ac7829
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发表时间：
2022
影响因子：
3.9
通讯作者：
Yoshida Mamia
中科院分区：
文献类型：
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作者：
Yuasa Masayoshi;Tanaka Miu;Shimizu Masayo;Yoshida Mamia
采用行星式球磨法制备了氮掺杂和硫掺杂的多层石墨烯（N掺杂和S掺杂的MSMG），并将其应用于双功能气体扩散电极（GDE）中进行氧还原反应（ORR）和析氧反应（OER）。以石墨、三聚氰胺和单质硫为原料。表面积归一化的线性扫描伏安图显示，N-掺杂和S-掺杂的MSMG具有比未掺杂的MSMG更高的本征ORR/OER活性。当MSMG样品用于GDE时，N掺杂和S掺杂的MSMG显示出比未掺杂的MSMG更高的OER活性，但更低的ORR活性。我们分析了GDE的比表面积、固有ORR/OER活性和ORR/OER活性之间的关系，发现固有ORR活性和表面积在具有高ORR活性的GDE的制造中都是重要的，并且固有OER活性而不是表面积在具有高OER活性的GDE的制造中是重要的。由S掺杂的MSMG制备的GDE在基于MSMG的GDE中表现出最高的ORR/OER双功能活性，并且其ORR/OER双功能活性高于由其他材料（例如还原氧化石墨烯和氧化石墨烯）制备的GDE。
Nitrogen-doped and sulfur-doped mechanochemically synthesized multilayer graphene (N-doped and S-doped MSMG) were prepared by planetary ball-milling, and they were used in bifunctional gas diffusion electrodes (GDEs) for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Graphite, melamine, and elemental sulfur were used as raw materials. The surface area-normalized linear sweep voltammograms revealed that the N-doped and S-doped MSMG have higher intrinsic ORR/OER activity than the undoped MSMG. When the MSMG samples were used in GDEs, the N-doped and S-doped MSMG showed higher OER activity but lower ORR activity than the undoped MSMG. We analyzed the relationship between the specific surface area, intrinsic ORR/OER activity, and ORR/OER activity of GDEs and found that both the intrinsic ORR activity and surface area are important in the fabrication of GDEs with high ORR activity and that the intrinsic OER activity rather than the surface area is important in the fabrication of GDEs with high OER activity. The GDE fabricated from the S-doped MSMG showed the highest ORR/OER bifunctional activity among the MSMG-based GDEs, and its ORR/OER bifunctional activity was higher than the GDEs fabricated from other materials, such as reduced graphene oxide and electroconductive oxides.