Physical Chemistry · Surface Science · Nanotechnology · Materials Science · Metal Nanomaterials · Catalysis · Electrocatalysis · Sensor · Environmentally Benign Energy Conversion Devices
(1) Synthesis of porous noble-metal nanomaterials with tunable pore sizes.
Porous noble metal materials is of high technological importance due to its unique properties and various applications in fuel cells, sensors, purifications, stimulation electrodes, mechanical actuators and catalysis in general. How to establish a facile and robust synthetic strategy to control the sizes of pores and surface noble metal nanoparticles , so as to achieve the porous structures with excellent properties, is a focus of current nanomaterials research. In this project, we put forward the robust and large scale synthesis of porous noble metal materials, and explore their unique physical and chemical properties and potential applications. We plan to perform galvanic replacement method, which based on the galvanic replacement reaction between copper nanoplates and noble metal precursors in the solvent. Through adjusting the reaction parameters, the high quality porous noble metal materials with tunable pore and particles sizes will be prepared. Followed by the optimization of porous structure, the utilizations of porous noble metal materials in the gas-phase catalytic reaction and electrocatalysis will be demonstrated. This research results can provide the new principles and methods to synthesize the high performance porous noble metal materials, and further explorer their applications.
(2) Shape-controlled syntheses of metal nanocrystals through selective etching
Metal nanocrystals are of great importance to modern science and technology, with their wide applications ranging from industry to biology. Current researches have already shown the strong relationship between the shape of a nanocrystal and its properties, thus mastery over the shape enables enhancement of its usefulness for a given applications. In the case of catalysis, it is well-established that the activity and selectivity of a metal nanocrystal can be tuned by manipulating its shape thus its exposed facets. Therefore, shape-controlled synthesis of metal nanocrystals has attracted numerous attentions during the past decades, and many significant progresses have been made. How to establish a facile and robust synthetic strategy to control the surface structure so as to improve their catalytic properties is still an urgent topic and a focus of current nanomaterials research. In this project, we propose a synthetic approach based on "selective etching" with the assistance of capping agent and etchant, to selectively "cut" the original metal nanocrystals into new morphologies, and explore their unique physical and chemical properties and potential applications. We plan to perform solution phase synthesis, which based on the addition of original metal nanocrystals, capping agent, and etchant. Through tuning the reaction parameters, the high quality of metal nanocrystals with unique surface structures and sizes will be prepared, followed by the study of their catalytic properties toward different reactions. This research results can provide the new principles and methods to synthesize the high performance metal nanocatalysts.
(3) Synthesis of noble metal nanocrystals with sub-10 nm dimension for applications in catalysis and electro-catalysis.
(4) Synthesis of transition metal nanocrystals and their applications in catalysis.
(5) Construction of bimetallic nanocrystals for applications in fuel cell.