Morphological impact of 1-dimensional to 3-dimensional manganese dioxides on catalytic ozone decomposition correlated with crystal facets and lattice oxygen mobilities†
Haotian Wu, Runduo Zhang, Bin Kang, Xiaonan Guo, Zhaoying Di, Kun Wang, Jingbo Jia, Ying Wei and Zhou-jun Wang
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引用次数: 0
Abstract
Ozone is a pollutant that has received widespread attention in recent years, and manganese dioxide (MnO2) has been widely used for catalytic ozone decomposition. However, few studies have described the structure–activity correlation of different morphological types of MnO2. In this study, a series of MnO2 crystals (α-, β-, γ-, δ-, ε- and λ-MnO2) were synthesized, and their catalytic activities on ozone decomposition (25 °C, dry air) were comparatively studied, which exhibited the order ε-MnO2 > α-MnO2 > γ-MnO2 > β-MnO2 ≈ δ-MnO2 > λ-MnO2. XRD and HRTEM results confirmed their diversities on the exposed crystal planes. It was confirmed that ε-MnO2 with the (1 0 2) plane had the largest number of oxygen vacancies and the best oxygen mobility. These findings elucidated the favorable performance of ε-MnO2 in the aforementioned tests. DFT calculations revealed the reaction mechanism, showing that ε-MnO2 has the lowest energy barrier for the rate-determining O22− desorption step (2.04 eV). This work illustrated the crucial role of oxygen vacancies and the mobility of lattice oxygen, shedding light on the strategies for rational design and control synthesis of effective catalysts for ozone elimination.
期刊介绍:
Environmental Science: Nano serves as a comprehensive and high-impact peer-reviewed source of information on the design and demonstration of engineered nanomaterials for environment-based applications. It also covers the interactions between engineered, natural, and incidental nanomaterials with biological and environmental systems. This scope includes, but is not limited to, the following topic areas:
Novel nanomaterial-based applications for water, air, soil, food, and energy sustainability
Nanomaterial interactions with biological systems and nanotoxicology
Environmental fate, reactivity, and transformations of nanoscale materials
Nanoscale processes in the environment
Sustainable nanotechnology including rational nanomaterial design, life cycle assessment, risk/benefit analysis