Wang Zengjie, Zhou Hongpeng, Xue Jilai, Liu Xuan, Liu Shizhe, Li Xiang, He Dingyong
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.
State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Ultrason Sonochem. 2021 Apr;72:105457. doi: 10.1016/j.ultsonch.2020.105457. Epub 2021 Jan 4.
A persistent ultrasound-assisted hydrothermal method has been developed to prepare cobalt oxide incorporated nitrogen-doped graphene (CoO/N-GO) hybrids. The electrochemical behaviors and catalytic activity of the prepared hybrids have been systematically investigated as cathode materials for Al-air battery. The results show that ultrasonication can promote the yield ratio of CoO from 63.1% to 70.6%. The prepared CoO/N-GO hybrid with ultrasonication exhibits better ORR activity over that without ultrasonication. The assembled Al-air battery using the ultrasonicated CoO/N-GO hybrid exhibited an average working voltage of 1.02 V in 4 M KOH electrolyte at 60 mA∙cm, approximately 60 mV higher than that using hybrid without ultrasonication. This should be attributed to large number density of fine CoO particles growing on the dispersed GO sheets under the persistent ultrasonication. The related ultrasonic mechanism has been discussed in details.
一种持续超声辅助水热法已被开发用于制备氧化钴掺杂氮的石墨烯（CoO/N-GO）复合材料。作为铝空气电池的阴极材料，已对所制备复合材料的电化学行为和催化活性进行了系统研究。结果表明，超声处理可将CoO的产率从63.1%提高到70.6%。经超声处理制备的CoO/N-GO复合材料比未经超声处理的表现出更好的氧还原反应（ORR）活性。在60 mA∙cm的电流密度下，使用经超声处理的CoO/N-GO复合材料组装的铝空气电池在4 M KOH电解液中的平均工作电压为1.02 V，比使用未经超声处理的复合材料的电池高出约60 mV。这应归因于在持续超声作用下，细小的CoO颗粒在分散的氧化石墨烯片上生长的数量密度较大。相关的超声机制已进行了详细讨论。
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