材料科学
催化作用
碳纳米管
双功能
氧气
解吸
吸附
碳纤维
密度泛函理论
析氧
化学工程
纳米技术
电化学
电极
物理化学
化学
计算化学
有机化学
复合材料
工程类
复合数
作者
Fan Yang,Xiaoqing Liu,Haozhe Zhang,Jinhao Zhou,Jiuxing Jiang,Xihong Lu
标识
DOI:10.1016/j.ensm.2020.05.005
摘要
Carbon materials hold great promise as oxygen catalysts in rechargeable Zn-air batteries (ZABs) but suffer from the sluggish catalytic kinetics due to unfavorable intermediate specie adsorption/desorption properties. Herein, we demonstrate an effective oxygen-induced surface electron density modulation strategy to significantly boost the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities of carbon nanotubes. Experimental and theoretical studies conjointly reveal that the incorporation of electron-drawing oxygen atoms in the conjugated carbon nanotube plane imparts a relatively high positive charge density on adjacent carbon atoms, making them energetically favorable for OOH∗ adsorption in OER and OH∗ desorption in ORR. Such oxygen-modulated carbon nanotubes display excellent bifunctional catalytic activity toward both ORR and OER. The as-fabricated aqueous and flexible all-solid-state ZABs display superb peak power densities of 130.5 mW cm−2 and 103.5 mW cm−2 with good durability, outstripping most of recently reported ZABs. This surface electron density modulation method may open up valuable insights for designing other robust carbon electrocatalysts for ZABs and beyond.
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