As an n-type wide band gap semiconductor material and high-performance energy material, SnO2 has special properties and structure and has been widely used in many aspects, such as transparent light electrode, electrocatalysis, photocatalysis, gas sensitive sensor, lithium ion battery, environmental catalysis, and so on. With the progress of science and technology and the development of economy, the controllable preparation and batch application of nano-SnO2 materials are within reach. In this chapter, the structural features, preparation methods, energy (solar cells, lithium-ion batteries, and electrocatalytic conversion) and environmental applications (adsorption purification and photocatalytic degradation), and typical case analysis of nano-MnO2 are briefly analyzed and summarized.
