NCS–NCO/FGP0.44 with a cellular network of porous nanosheets and close-contact heterointerface reveals accelerated interfacial mass/electron transportation for overall water splitting.
Ozone (O3) pollution is highly detrimental
to human
health and the ecosystem due to it being ubiquitous in ambient air
and industrial processes. Catalytic decomposition is the most efficient
technology for O3 elimination, while the moisture-induced
low stability represents the major challenge for its practical applications.
Here, activated carbon (AC) supported δ-MnO2 (Mn/AC-A)
was facilely synthesized via mild redox in an oxidizing atmosphere
to obtain exceptional O3 decomposition capacity. The optimal
5Mn/AC-A achieved nearly 100% of O3 decomposition at a
high space velocity (1200 L g–1 h–1) and remained extremely stable under entire humidity conditions.
The functionalized AC provided well-designed protection sites to inhibit
the accumulation of water on δ-MnO2. Density functional
theory (DFT) calculations confirmed that the abundant oxygen vacancies
and a low desorption energy of intermediate peroxide (O2
2–) can significantly boost O3 decomposition
activity. Moreover, a kilo-scale 5Mn/AC-A with low cost (∼1.5
$/kg) was used for the O3 decomposition in practical applications,
which could quickly decompose O3 pollution to a safety
level below 100 μg m–3. This work offers a
simple strategy for the development of moisture-resistant and inexpensive
catalysts and greatly promotes the practical application of ambient
O3 elimination.
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