Templated synthesis of crystalline mesoporous CeO_(2) with organosilane-containing polymers: balancing porosity, crystallinity and catalytic activity

查看全文 作　　者：Qiang [1]Luo;Zichao [1]Wei;Hanyi [1]Duan;Lei [1]Jin;Rumasha N T [1]Kankanamage;Seth [1]Shuster;Steven L [1,3]Suib;James F [1,3,4,5]Rusling;Jie [1,2,3]He 机构地区：[1]Department of Chemistry,University of Connecticut,Storrs,CT 06269,United States of America;[2]Polymer Program,University of Connecticut,Storrs,CT 06269,United States of America;[3]Institute of Materials Science,University of Connecticut,Storrs,CT 06269,United States of America;[4]Department of Surgery and Neag Cancer Center,UConn Health,Farmington,CT 06232,United States of America;[5]School of Chemistry,National University of Ireland Galway,Galway,Ireland 出　　处：《Materials Futures》索引2022年第1卷第2期,共11页 基　　金：J H is grateful for the financial support from National Science Foundation(CEBT-1705566);The HR-TEM studies were performed using the facilities in the UConn Thermo Fisher Scientific Center for Advanced Microscopy and Materials Analysis(CAMMA).Low-magnification TEM and SEM images were obtained at the Biosciences Electron Microscopy Facility at the University of Connecticut;This work was also partially supported by the Green Emulsions Micelles and Surfactants(GEMS)Center of the University of Connecticut. 摘　　要：We report the synthesis of ordered mesoporous ceria(mCeO_(2))with highly crystallinity and thermal stability using hybrid polymer templates consisting of organosilanes.Those organosilane-containing polymers can convert into silica-like nanostructures that further serve as thermally stable and mechanically strong templates to prevent the collapse of mesoporous frameworks during thermal-induced crystallization.Using a simple evaporation-induced self-assembly process,control of the interaction between templates and metal precursors allows the co-self-assembly of polymer micelles and Ce^(3+)ions to form uniform porous structures.The porosity is well-retained after calcination up to 900℃.After the thermal engineering at 700℃ for 12 h(mCeO_(2)-700-12 h),mCeO_(2) still has a specific surface area of 96 m^(2) g^(−1) with a pore size of 14 nm.mCeO_(2) is demonstrated to be active for electrochemical oxidation of sulfite.mCeO_(2)-700-12 h with a perfect balance of crystallinity and porosity shows the fastest intrinsic activity that is about 84 times more active than bulk CeO_(2) and 5 times more active than mCeO_(2) that has a lower crystallinity. 关 键 词：mesoporous materials cerium oxides crystalline oxides ELECTROCATALYSIS sulfite oxidation