Porous materials are a family of materials containing pores with pore diameters of less than 100 nm. According to the International Union of Pure and Applied Chemistry (IUPAC) classication,1 nanopores can be divided into three types, that is, micropores with diameter less than 2 nm, mesopores with diameter in the range of 2-50 nm, and macropores with diameter in the range of 50-100 nm. Compared with bulk materials, nanoporous materials offer a higher specic surface area and more functional sites. Therefore, the utilization and performance of materials are remarkably improved. Among these nanoporous materials, mesoporous materials have attracted various interests due to their pore size arrangement, which is suitable for the incorporation of most kinds of guest species. Various kinds of materials have been successfully fabricated into mesoporous structures, including metals, inorganic oxides, inorganic nonoxides, and polymers.