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Co3O4 Hollow Porous Nanospheres with Oxygen Vacancies for Enhanced Li–O2 Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-23 00:00:00 , DOI: 10.1021/acsaem.0c00426 Yingmeng Zhang 1 , Lixia Feng 1 , Wentao Zhan 1 , Shaojun Li 1 , Yongliang Li 1 , Xiangzhong Ren 1 , Peixin Zhang 1 , Lingna Sun 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-23 00:00:00 , DOI: 10.1021/acsaem.0c00426 Yingmeng Zhang 1 , Lixia Feng 1 , Wentao Zhan 1 , Shaojun Li 1 , Yongliang Li 1 , Xiangzhong Ren 1 , Peixin Zhang 1 , Lingna Sun 1
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Creating oxygen vacancies to tune the surface electronic structure is a feasible approach to enhance the electrocatalytic activities of noble-metal-free transition-metal oxides for Li–O2 batteries. Herein, vacancy-rich Co3O4 hollow porous nanospheres have been obtained through a facile reduction strategy from Co3O4 hollow porous nanospheres, which were prepared in a self-template construction manner through a solvothermal synthesis followed by a heat treatment. The reduced Co3O4 hollow porous nanospheres composed of numerous nanoparticles show a unique porous and hollow structure with abundant surface oxygen vacancies. The oxygen vacancy defects can produce more electrochemical active sites and improve the electrical conductivity as well as increase the adsorbed oxygen-containing molecules for the enhanced Li–O2 battery performance. Therefore, the reduced Co3O4 sample with oxygen vacancies shows lower overpotential, higher discharge capacity, longer cycling life, and better rate capability than the pristine one.
中文翻译：
具有氧空位的Co 3 O 4空心多孔纳米球，用于增强Li–O 2电池
创建氧空位以调节表面电子结构是增强Li-O 2电池的无贵金属过渡金属氧化物的电催化活性的可行方法。在此，通过简便的还原策略从Co 3 O 4中空多孔纳米球中获得了空位丰富的Co 3 O 4中空多孔纳米球，其通过溶剂热合成然后通过热处理以自模板构造的方式制备。还原后的Co 3 O 4由许多纳米粒子组成的中空多孔纳米球表现出独特的多孔和中空结构，表面氧空位丰富。氧空位缺陷可以产生更多的电化学活性位，并改善电导率，并增加吸附的含氧分子，从而增强Li-O 2电池的性能。因此，与原始样品相比，具有氧空位的还原Co 3 O 4样品显示出更低的过电势，更高的放电容量，更长的循环寿命和更好的速率能力。
更新日期：2020-03-23
中文翻译：
具有氧空位的Co 3 O 4空心多孔纳米球，用于增强Li–O 2电池
创建氧空位以调节表面电子结构是增强Li-O 2电池的无贵金属过渡金属氧化物的电催化活性的可行方法。在此，通过简便的还原策略从Co 3 O 4中空多孔纳米球中获得了空位丰富的Co 3 O 4中空多孔纳米球，其通过溶剂热合成然后通过热处理以自模板构造的方式制备。还原后的Co 3 O 4由许多纳米粒子组成的中空多孔纳米球表现出独特的多孔和中空结构，表面氧空位丰富。氧空位缺陷可以产生更多的电化学活性位，并改善电导率，并增加吸附的含氧分子，从而增强Li-O 2电池的性能。因此，与原始样品相比，具有氧空位的还原Co 3 O 4样品显示出更低的过电势，更高的放电容量，更长的循环寿命和更好的速率能力。
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