Abstract
Manganese dioxide (MnO2) is an important inorganic functional material with outstanding physical and chemical properties. Meanwhile, MnO2 has abundant resources, low price, and environmental friendliness. The MnO2 nanostructures show satisfactory performance and application prospects in the applications of electrochemical energy storage (supercapacitor and battery) or conversion (electrocatalysis) and environmental remediation or protection (such as adsorption, photocatalysis, advanced oxidation, etc.). The six crystalline types MnO2 (α, β, γ, δ, ε, and λ-MnO2) show the obvious relationship between crystalline phase and catalytic activity. In this chapter, the structural features, preparation methods, energy and environmental applications, and typical case analysis of nano-MnO2 are briefly analyzed and summarized.
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