A Modular Co‐assembly Strategy for Ordered Mesoporous Perovskite Oxides with Abundant Surface Active Sites

Abstract

The ordered mesoporous perovskite oxides with well-defined mesostrcture and versatile metal sites are attractive, but their successful synthesis faces challenges of complicated assembly dynamics and pore collapse in crystalline calcination. Here, we propose an energy balance concept to reveal interplay relationship in assembly process and realize regulation of porous structure for mesoporous perovskite oxides. A series of ordered mesoporous perovskite oxides with unique porous structure were prepared by a modular coassembly method. Mesoporous La 2 Zr 2 O 7 shows 94 % conversion and 99 % selectivity for hydrogenation of 5hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan. Experiments reveal that rich Lewis acid sites, active Zr species, and favorable porous structure promote interaction between mesoporous La 2 Zr 2 O 7 and HMF and reduce catalytic energy barrier. This work provides the insight into molecule co-assembly and developing multiple component ordered mesoporous materials.

Functionalized Regulation of Metal Defects in ln2S3 of p–n Homojunctions

“…The BET surface area of the In 2 S 3 reached 32.1 m 2 /g, while that of the A/C-IS showed a reduction due to the change in pore structure. As shown in Figure b, there are mainly micropores and mesopores in the In 2 S 3 , while there are mesoporous and macroporous in the A/C-IS that could be conductive to the transfer of macromolecules . The obvious changes in the pore structure were attributed to the introduction of CTAB with a long polyalkyl carbon chain.…”

Regulation of the B Site at La(Ni0.1)MnO3 Perovskite Decorated with N-Doped Carbon for a Bifunctional Electrocatalyst in Zn–Air Batteries

“…Perovskite oxides with the ABO 3 structure have received extensive attention, emerging as new catalysts due to the flexible crystal structure, rich defect sites, and controllable electronic states. − Lanthanum (La)-based perovskites were reported as promising catalysts, possessing the superior ORR activity among LnMnO 3 (Ln = rare earth metals) . The potential of Mn 4+ /Mn 3+ redox transition in LaMnO 3 could be used as a descriptor for ORR activity .…”

Self-Supported Carbon Electrodes with a Carbon Membrane and Co3O4 Nanosheets for High-Performance Enzymeless Glucose Detection and Supercapacitors

“…Carbonaceous materials are widely employed as supports, adsorbents, and metal-free electrocatalysts to address crucial energy and environmental issues during the past decades. − After the graphite electrodes were applied for the production of alkali metals, carbon electrode materials have been extensively investigated in both academic research and industrial applications due to their unique physical and chemical properties. , The attractive features of carbonaceous electrode materials include relatively inert electrochemistry, wide potential window, structural diversification, electrocatalytic activity for various redox reactions, rich surface chemistry, and low cost. ,− Therefore, tremendous research efforts are devoted to the design and synthesis of efficient carbon electrode materials, especially porous carbon materials. ,− This is because the pores in carbon with different sizes and shapes can dramatically lower apparent density and increase the surface area, which facilitate the interfacial energy and mass transfer, thus improving the electrochemical properties of carbonaceous electrodes in many electrochemical processes …”