物理化学学报2017，Vol.33Issue(11)：2237-2244,8.DOI:10.3866/PKU.WHXB201705231
锂氧电池双功能还原石墨烯-LaFeO3复合纳米催化剂的制备及性能
Reduced Graphene Oxide-LaFeO3 Composite Nanomaterials as Bifunctional Catalyst for Rechargeable Lithium-Oxygen Batteries
摘要
Abstract
Development of electrocatalysts is one of the challenges in the development of the lithium-oxygen battery,especially the synthesis of catalysts with special pore structures and excellent bifunctional catalytic performance for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER).In this article,a reduced graphene oxide-LaFeO3 (RGO-LaFeO3) nanocomposite electrocatalyst was synthesized by combining sol-gel and hydrothermal methods and using graphene oxide,lanthanum ritrate,ferric nitrate,and citric acid as raw materials.The prepared samples were characterized by X-ray diffraction,Fourier transform infrared spectroscopy,Raman spectroscopy,and scanning electron microscopy.The results confirmed that the RGO-LaFeO3 was composed of pure phase LaFeO3 with a perovskite structure and RGO and that the LaFeO3 nanoparticles were loaded uniformly on the RGO layer surface.In comparison with a LaFeO3 nanoparticle (NP-LaFeO3) catalyst,RGO-LaFeO3 exhibited superior activity for both the ORR and the OER when it served as the cathode of a lithium-oxygen battery.The higher catalytic activity of the RGO-LaFeO3 is attributed to the synergistic effect of the special three-dimensional electronic conductive structure of RGO and the intrinsic catalytic property of LaFeO3.It was shown that the lithium-oxygen battery with the RGO-LaFeO3 cathode can be cycled stably up to 36 reversible cycles under conditions of a limit discharge depth of 1000 mAh·g-1 and a 100 mA·g-1 current density for charge-discharge.The study illustrates that the RGO-LaFeO3 bifunctional electrocatalyst is a promising candidate for the cathode in lithium-oxygen batteries.关键词
RGO-LaFeO3/双功能催化剂/ORR/OER/锂氧电池/溶胶凝胶法/水热法Key words
RGO-LaFeO3/Bifunctional catalyst/ORR/OER/Li-O2 battery/Sol-gel/Hydrothermal分类
化学化工引用本文复制引用
张晓茹,许跃峰,沈守宇,陈媛,黄令,李君涛,孙世刚..锂氧电池双功能还原石墨烯-LaFeO3复合纳米催化剂的制备及性能[J].物理化学学报,2017,33(11):2237-2244,8.基金项目
The project was supported by the National Natural Science Foundation of China (21621091) and the National Key Research and Development Program of China (2016YFB0100202).国家自然科学基金(21621091)和国家重点研发计划(2016YFB0100202)资助项目 （21621091）
