Structure design and catalytic performance of LDH based materials
作者单位：State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology
会议名称：《中国化学会第十届全国无机化学学术会议》
会议日期：2019年
学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术]
关 键 词：layered double hydroxide topological transformation heterogeneous catalysts
摘 要：Layered double hydroxide(LDHs) represent an important class of 2D layered materials with the general formula of [MM(OH)](A)x/n·mHO. Compared with other oxides(hydroxides), LDHs show the advantage of tunable chemical composition, thickness, and precursors of metal oxides, thereby can be widely used as electrocatalysts, photocatalysts and thermocatalysts. Recently, our group investigated the unique structure and applications of LDHs.(1). We reported a facile one-step method to synthesize single Ru atoms supported on a monolayer NiFe-layered double hydroxide(denoted as Ru/mono-NiFe). Through XAFS, STEM and DFT calculation, we have demonstrated that the single Ru atoms are not dispersed randomly in the LDH structure but are uniquely located on the top of the Fe-metal atom of mono-NiFe via three oxygen atoms. (2). We reported a heterogeneous photocatalyst system that consists of ruthenium complex and monolayer NiAl-LDH, which act as light-harvesting and catalytic units for selective photoreduction of CO and HO into CH and CO, the selectivity of CH is 70.3%, and the H evolution reaction can be completely suppressed under irradiation with λ 600 nm. (3). Topological transformation of layered double hydroxides(LDHs) to the corresponding mixed metal oxides(MMOs) offers an efficient strategy to achieve such interfaces. We reported a detailed investigation of the topological transformation of LDHs. The as-prepared MMO with abundant interfaces can be modulated by calcination of ZnCo-LDH at different temperatures. Among them, the ZnCo-LDH calcinated at 200 °C revealed the most abundant interfaces and exhibits excellent performance in electrochemical water oxidation.