Carbon Resources Institute, Korea Research Institute of Chemical Technology (KRICT) , 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea.
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , 77 Cheongam-Ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea.
ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5429-5439. doi: 10.1021/acsami.7b14599. Epub 2018 Jan 31.
In this paper, bifunctional catalysts consisting of perovskite LaCoFeO nanowires (LCFO NWs) with reduced graphene oxide (rGO) sheets were prepared for use in lithium-oxygen (Li-O) battery cathodes. The prepared LCFO@rGO composite was explored as a cathode catalyst for Li-O batteries, resulting in an outstanding discharge capacity (ca. 7088.2 mAh g) at the first cycle. Moreover, a high stability of the O-cathode with the LCFO@rGO catalyst was achieved over 56 cycles under the capacity limit of 500 mAh g with a rate of 200 mA g, as compared to the Ketjenblack carbon and LCFO NWs. The enhanced electrochemical performance suggests that these hybrid composites of perovskite LCFO NWs with rGO nanosheets could be a perspective bifunctional catalyst for the cathode oxygen reduction and oxygen evolution reactions in the development of next-generation Li-O battery cathodes.
本文制备了钙钛矿型 LaCoFeO 纳米线（LCFO NWs）与还原氧化石墨烯（rGO）片组成的双功能催化剂，用于锂-氧（Li-O）电池的阴极。所制备的 LCFO@rGO 复合材料被探索用作 Li-O 电池的阴极催化剂，在第一个循环中表现出出色的放电容量（约 7088.2 mAh g）。此外，与 Ketjenblack 碳和 LCFO NWs 相比，在 500 mAh g 的容量限制下，以 200 mA g 的速率，LCFO@rGO 催化剂的 O-阴极在 56 个循环内具有高稳定性。增强的电化学性能表明，这种钙钛矿型 LCFO NWs 与 rGO 纳米片的混合复合材料可能是下一代 Li-O 电池阴极中氧还原和氧析出反应的有前途的双功能催化剂。
