高温驱动氧化锰刻蚀制备纳米氧化锰-多孔石墨烯及其锂空气电池性能研究

本文通过简单的电荷吸附制备了高分散的氧化石墨烯含锰化合物（Mn-GO），利用高温驱动下氧化锰的生长以及热运动同时实现了GO的还原、刻蚀和纳米氧化锰的负载，即成功构筑了纳米氧化锰-多孔石墨烯复合材料（MnO-PGNSs）. 对影响GO分散性的Mn²⁺的添加量、影响GO层数的分散液浓度以及影响MnO热运动的烧结条件进行了详细的考察. 研究发现，当Mn-GO同时满足优异的分散性、适合的片层厚度和烧结条件（＞800℃，>2h），才能在GNSs表面刻蚀成孔制备得到MnO-PGNSs. 本文进一步将MnO-PGNSs作为锂空气电池正极材料，结果表明在50 mA·g^-1的电流密度下深度放电后容量达到5100 mAh·g^-1，相比于GNSs和PGNSs，MnO-PGNSs具有更高的比容量. 锂空气电池性能的提高得益于GNSs表面的多孔结构和MnO优异的催化活性.

Preparation of Nanostructural MnO-porous Graphene Hybrid Material by Thermally-driven Etching of MnO for Lithium-Air Batteries

In this paper, improving the surface morphology of graphene(GNSs) as designed concept. we describe a MnO/porous-graphene(MnO-PGNSs) was synthesized by a simple site-localized Mn²⁺ on GO (Mn-GO) by charge adsorption and then driving by high-temperature calcination, growing MnO nanoparticles and etching GNSs achieved on step. And Then focus on the key factors of influenced the etch hole formation are analyzed, founded the dispersion of Mn-GO; layer number of GO and calcination temperature also affected the formation of holes. In addition, the MnO-PGNSs as lithium-air battery cathode exhibits high reversible capacity compared with GNSs and PGNs and it is able to deliver storage capacity as high as 5100 mAh·g^-1 at 50 mA·g^-1.