Hierarchical Mesoporous/Macroporous Perovskite La0.5Sr0.5CoO3鈥?i>x Nanotubes: A Bifunctional Catalyst with Enhanced Activity and Cycle Stability for Rechargeable L

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• 作者：Guoxue Liu ; Hongbin Chen ; Lu Xia ; Suqing Wang ; Liang-Xin Ding ; Dongdong Li ; Kang Xiao ; Sheng Dai ; Haihui Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：7
• 期：40
• 页码：22478-22486
• 全文大小：695K
• ISSN：1944-8252

文摘

Perovskites 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鈥揼el methods lead to low utilization of catalytic sites, which gives rise to poor Li鈥揙₂ batteries performance and restricts their application. Herein, a hierarchical mesporous/macroporous perovskite La_0.5Sr_0.5CoO_3-x (HPN-LSC) nanotube is developed to promote its application in Li鈥揙₂ batteries. The HPN-LSC 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鈥揙₂ 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鈥揙₂ batteries with good rate capability and excellent cycle stability of sustaining 50 cycles at a current density of 0.1 mA cm^鈥? with an upper-limit capacity of 500 mAh g^鈥?. The results will benefit for the future development of high-performance Li鈥揙₂ batteries using hierarchical mesoporous/macroporous nanostructured perovskite-type catalysts.