Hierarchical mesoporous/macroporous perovskite La₀.₅Sr₀.₅CoO₃-ₓ nanotubes: a bifunctional catalyst with enhanced activity and cycle stability for rechargeable lithium oxygen batteries
hierarchical mesoporous/macroporous nanotubes
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AbstractPerovskites show excellent specific catalytic activity toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline solutions; however, small surface areas of the perovskites synthesized by traditional sol−gel methods lead to low utilization of catalytic sites, which gives rise to poor Li−O2 batteries performance and restricts their application. Herein, a hierarchical mesporous/macroporous perovskite La0.5Sr0.5CoO3‑x (HPN-LSC) nanotube is developed to promote its application in Li−O2 batteries. The HPNLSC nanotubes were synthesized via electrospinning technique followed by postannealing. The as-prepared HPN-LSC catalyst exhibits outstanding intrinsic ORR and OER catalytic activity. The HPN-LSC/KB electrode displays excellent performance toward both discharge and charge processes for Li−O2 batteries, which enhances the reversibility, the round-trip efficiency, and the capacity of resultant batteries. The synergy of high catalytic activity and hierarchical mesoporous/macroporous nanotubular structure results in the Li−O2 batteries with good rate capability and excellent cycle stability of sustaining 50 cycles at a current density of 0.1 mA cm−2 with an upperlimit capacity of 500 mAh g−1. The results will benefit for the future development of high-performance Li−O2 batteries using hierarchical mesoporous/macroporous nanostructured perovskite-type catalysts.
Guoxue Liu, Hongbin Chen, Lu Xia, Suqing Wang, Liang-Xin Ding, Dongdong Li, Kang Xiao, Sheng Dai and Haihui Wang
ACS Applied Materials and Interfaces, 2015; 7(40):22478-22486