Xue Hairong, Ma Yiou, Wang Tao, Gong Hao, Gao Bin, Fan Xiaoli, Yan Juanjuan, Meng Xianguang, Zhang Songtao, He Jianping
Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
Photofunctional Materials Research Platform, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan, China.
Front Chem. 2019 Jul 25;7:511. doi: 10.3389/fchem.2019.00511. eCollection 2019.
The design of mesoporous or hollow transition metal oxide/carbon hybrid catalysts is very important for rechargeable Li-O batteries. Here, spindle-like FeO with hollow mesoporous structure on CNTs backbones (FeO-HMNS@CNT) are prepared by a facile hydrolysis process combined with low temperature calcination. Within this hybrid structure, the hollow interior and mesoporous shell of the FeO nanospindles provide high specific surface area and abundant catalytical active sites, which is also beneficial to facilitating the electrolyte infiltration and oxygen diffusion. Furthermore, the crisscrossed CNTs form a three-dimensional (3D) conductive network to accelerate and stabilize the electron transport, which leads to the decreasing internal resistance of electrode. As a cathodic catalyst for Li-O batteries, the FeO-HMNS@CNT composite exhibits high specific capacity and excellent cycling stability (more than 100 cycles).
介孔或中空过渡金属氧化物/碳杂化催化剂的设计对于可充电锂氧电池非常重要。在此，通过简便的水解过程结合低温煅烧，制备了在碳纳米管骨架上具有中空介孔结构的纺锤状FeO（FeO-HMNS@CNT）。在这种杂化结构中，FeO纳米纺锤体的中空内部和介孔壳提供了高比表面积和丰富的催化活性位点，这也有利于促进电解质渗透和氧扩散。此外，纵横交错的碳纳米管形成三维（3D）导电网络，以加速和稳定电子传输，从而降低电极的内阻。作为锂氧电池的阴极催化剂，FeO-HMNS@CNT复合材料表现出高比容量和优异的循环稳定性（超过100次循环）。
