CoO/rGO复合催化剂的合成、表征和电性能研究

Synthesis, Characterization and Electrical Properties of CoO/rGO Composite Catalyst

通过水热-煅烧法将氧化钴(CoO)纳米片负载在还原氧化石墨烯(rGO)表面形成CoO/rGO复合物,该方法简单、安全、绿色环保。5-10nm的CoO纳米片均匀地负载在rGO表面,一方面可以提供更多的反应活性位从而促进ORR和OER的进行,另一方面可以促进不溶放电产物Li_2O_2的可逆形成和分解。得益于CoO和rGO协同效应,CoO/rGO复合物作为锂空气电池的阴极催化,电池第一圈的放电比容量高达10280mAhg^(-1)且库伦效率可以高达95%,同时具有良好的循环性能。

Ultrathin CoO nanosheets grown on the reduced graphene oxide(CoO/rGO)is prepared via a modifified hydrothermalcalcining route,which is simplicity,safety and environmental protection.The 5-10 nm CoO nanoparticles are uniformly dispersed on graphene nanosheets without aggregation,which can provide much more active sites for catalyzing the reactions of ORR and OER as well as also can conduce to the reversible formation and decomposition of insoluble discharge product Li2O2.CoO and graphene can play a synergic and complementary role in improving the kinetics of ORR and OER through the combination of CoO and graphene.As a result,The cathode catalyzed by CoO/rGO shows a good discharge capacity of 10280 mAh g-1 along with an excellent coulombic efficiency(95%),and also has an enhanced cycling stability.