Hierarchical Mesoporous/Macroporous Perovskite La0.5Sr0.5CoO3–xNanotubes: A Bifunctional Catalyst with Enhanced Activity and Cycle Stability for Rechargeable Lithium Oxygen Batteries

• DOI: 10.1021/acsami.5b06587
• Publication Date: 2015-09-29T22:21:19Z
• Authors: Guoxue Liu; Hongbin Chen; Lu Xia; Suqing Wang; Liang-Xin Ding; Dongdong Li; Kang Xiao; Sheng Dai; Haihui Wang
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Perovskites show excellent specific catalytic activity toward both oxygen reduction reaction (ORR) and evolution (OER) in alkaline solutions; however, small surface areas of the perovskites synthesized by traditional sol-gel methods lead to low utilization sites, which gives rise poor Li-O2 batteries performance restricts their application. Herein, a hierarchical mesporous/macroporous perovskite La0.5Sr0.5CoO3-x (HPN-LSC) nanotube is developed promote its application batteries. The HPN-LSC nanotubes were via electrospinning technique followed postannealing. as-prepared catalyst exhibits outstanding intrinsic ORR OER activity. HPN-LSC/KB electrode displays discharge charge processes for batteries, enhances reversibility, round-trip efficiency, capacity resultant synergy high mesoporous/macroporous nanotubular structure results with good rate capability cycle stability sustaining 50 cycles at current density 0.1 mA cm(-2) an upper-limit 500 mAh g(-1). will benefit future development high-performance using nanostructured perovskite-type catalysts.