A facile surfactant-free synthesis of Rh flower-like nanostructures constructed from ultrathin nanosheets and their enhanced catalytic properties  

作　　者：Yaqi Jiang Jingyun Su Yanan Yang Yanyan Jia Qiaoli Chen Zhaoxiong Xie Lansun Zheng 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, andDepartment of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

出　　处：《Nano Research》2016年第3期849-856,共8页纳米研究（英文版）

基　　金：This work was supported by the National Basic Research Program of China （Nos. 2011CBA00508 and 2015CB932301）, the National Natural Science Foundation of China （Nos. 21131005, 21333008, and J1310024）, and the Natural Science Foundation of Fujian Province of China （No. 2014J01058）.

摘　　要：Rh is an important catalyst that is widely used in a variety of organic reactions. In recent years, many efforts have focused on improving its catalytic efficiency by fabricating catalyst nanoparticles with controlled size and morphology. However, the frequently employed synthesis route using organic compounds either as the reaction medium or capping agent often results in residual molecules on the catalyst surface, which in turn drastically diminishes the catalytic performance. Herein, we report a facile, aqueous, surfactant-free synthesis of a novel Rh flower- like structure obtained via hydrothermal reduction of Rh（acac）3 by formaldehyde. The unique Rh nanoflowers were constructed from ultrathin nanosheets, whose basal surfaces comprised {111} facets with an average thickness of -1.1 nm. The specific surface area measured by CO stripping was 79.3 m2-g-1, which was much larger than that of commercial Rh black. More importantly, the Rh nanoflower catalyst exhibited excellent catalytic performance in the catalytic hydrogenation of phenol and cyclohexene, in contrast to the commercial Rh black and polyvinyl pyrrolidone （PVP）-capped Rh nanosheets exposed by similar {111} basal surfaces.Rh is an important catalyst that is widely used in a variety of organic reactions. In recent years, many efforts have focused on improving its catalytic efficiency by fabricating catalyst nanoparticles with controlled size and morphology. However, the frequently employed synthesis route using organic compounds either as the reaction medium or capping agent often results in residual molecules on the catalyst surface, which in turn drastically diminishes the catalytic performance. Herein, we report a facile, aqueous, surfactant-free synthesis of a novel Rh flower- like structure obtained via hydrothermal reduction of Rh（acac）3 by formaldehyde. The unique Rh nanoflowers were constructed from ultrathin nanosheets, whose basal surfaces comprised {111} facets with an average thickness of -1.1 nm. The specific surface area measured by CO stripping was 79.3 m2-g-1, which was much larger than that of commercial Rh black. More importantly, the Rh nanoflower catalyst exhibited excellent catalytic performance in the catalytic hydrogenation of phenol and cyclohexene, in contrast to the commercial Rh black and polyvinyl pyrrolidone （PVP）-capped Rh nanosheets exposed by similar {111} basal surfaces.

关 键 词：RHODIUM nanocrystal NANOSHEET hydrogenation reaction 

分 类 号：TQ423[化学工程] TB383[一般工业技术—材料科学与工程]