石墨烯
臭氧
分解
催化作用
吸附
材料科学
化学吸附
化学工程
纳米纤维
碳纳米纤维
石墨
纳米技术
锰
相对湿度
分子
化学
复合材料
碳纳米管
有机化学
冶金
工程类
物理
热力学
作者
Guoxiang Zhu,Zhu Wang,Yang Lou,Jun Ma,Wenqing Yao,Ruilong Zong,Yongfa Zhu
标识
DOI:10.1038/s41467-021-24424-x
摘要
Abstract Major challenges encountered when developing manganese-based materials for ozone decomposition are related to the low stability and water inactivation. To solve these problems, a hierarchical structure consisted of graphene encapsulating α-MnO 2 nanofiber was developed. The optimized catalyst exhibited a stable ozone conversion efficiency of 80% and excellent stability over 100 h under a relative humidity (RH) of 20%. Even though the RH increased to 50%, the ozone conversion also reached 70%, well beyond the performance of α-MnO 2 nanofiber. Here, surface graphite carbon was activated by capturing the electron from inner unsaturated Mn atoms. The excellent stability originated from the moderate local work function, which compromised the reaction barriers in the adsorption of ozone molecule and the desorption of the intermediate oxygen species. The hydrophobic graphene shells hindered the chemisorption of water vapour, consequently enhanced its water resistance. This work offered insights for catalyst design and would promote the practical application of manganese-based catalysts in ozone decomposition.
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