Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 11, Pages 15180-15190Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03646
Keywords
CuCo2O4 nanotubes; electrospinning; mesoporous/macroporous structure; bifunctional catalysts; Li-O-2 batteries
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Funding
- National Natural Science Foundation of China [21576028, 21376001, 21506012]
- Opening Project of State Key Laboratory of Advanced Chemical Power Sources [SKL-ACPS-C-19]
- Program for Innovative and Entrepreneurial team in Zhuhai [ZH01110405160007PWC]
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The structural engineering and design of effectively bifunctional cathode catalysts perform a vital role in enhancing the oxygen-electrode kinetics for achieving highly reversible Li-O-2 batteries. Herein, one-dimensional CuCo2O4 nanotubes are fabricated by a cost-efficient electrospinning technique as a bifunctional cathodic catalyst for a lithium-oxygen battery for the first time. The as fabricated CuCo2O4 nanotubes with hollow and hierarchically mesoporous/macroporous architecture accelerate the mass (O-2 and Li+) transport and alleviate the clog of insoluble discharge products. Along with their highly intrinsic activity toward oxygen reduction and evolution reactions, the CuCo2O4 nanotubes-based lithium-oxygen battery demonstrates remarkably improved electrochemical performance, such as low overpotential, high discharge capacities (8778 mAh g(-1) at 100 mA g(-1)), superb rate capability, and superior reversibility up to 128 cycles under a controlled capacity of 1000 mAh g(-1) at 200 mA gr(-1). The further ex-situ SEM and XRD analyses reveal that the disk-like toroidal-shaped Li2O2 product can be efficiently decomposed during the recharging process, confirming the good reversibility of CuCo2O4 nanotubes-based cathode. These outcomes demonstrate the good prospect of CuCo2O4 nanotubes as an effectively non-noble metal catalyst in the reversible Li-O-2 battery.
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