Synthesis of Ordered Mesoporous Manganese Oxides by Double Replication for Use as an Electrode Material

摘要

Periodically ordered mesoporous manganese oxides were synthesized in a single and double replication procedure. Mesoporous SBA-15 and -16 silica and their reverse replica carbons were successively used as hard templates. The silica and carbon pore systems were infiltrated with Mn(NO3)2·xH2O or Mn(AcAc)2, which was then converted to MnO3 at 873 K; the silica and carbon matrix were finally removed by NaOH solution or calcinations in air. The structure of the mesoporous Mn2O3, using a carbon template, corresponds to that of the original SBA-15 and SBA-16 silica. The products consist of hexagonally arranged cylindrical mesopores with crystalline pore walls or cubic mesoporous pores. The structure of replica has been confirmed by XRD, TEM analysis, and its electrochemical properties were tested with cyclic vol-tammetry. Formation of Mn2O3 inside the mesoporous carbon pore system showed much improved electrical properties.