Ligand-controlled synthesis of high density and ultra-small Ru nanoparticles with excellent electrocatalytic hydrogen evolution performance  

作　　者：Zhiwen Che Xuyun Lu Bingfeng Cai Xiangxing Xu Jianchun Bao Ying Liu 

机构地区：[1]School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,China

出　　处：《Nano Research》2022年第2期1269-1275,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22075147 and 21533012)。

摘　　要：Ultra-small size metal nanoparticles(u-MNPs)have broad applications in the fields of catalysis,biomedicine and energy conversion.Herein,by means of a ligand-controlled synthesis strategy,series of Ru-based NPs with high dispersity and ultra-small size(marked as u-Ru/C),or sparse and aggregated state(marked as a-Ru/C)anchored on the surface of hollow porous carbon shells are prepared.Systematical in-situ thermogravimetry-mass spectrometry-Fourier transform infrared spectra tests suggest that the different ligands in these Ru-based precursors can regulate the nucleation,growth and fixation of metal sites during the pyrolysis process,thus contributing to Ru NPs with various size and dispersity.As a result,when applied to hydrogen evolution reaction,the u-Ru-1/C catalyst displays a low Tafel slope of 26 mV dec-1,overpotential of 31 mV(at 10 mA cm^(-2))and a large exchange current density of 1.7 mA cm^(-2) in 1.0 M KOH,significantly better than that of the a-Ru-2/C,hollow carbon and even commercial 20%Pt/C.This is mainly because that the u-Ru-1/C sample owns both smaller particle size,more electrochemical active sites,higher intrinsic activity and optimized surface H adsorption ability than that of the a-Ru-2/C counterpart.Such ligand-modulated growth strategy is not only applicable to Ru,but also can be extended to other similar metals,offering a step forward in the design and synthesis of highly dispersed u-MNPs.

关 键 词：ultra-small Ru nanoparticles LIGAND in-situ test formation mechanism hydrogen evolution reaction 

分 类 号：O64[理学—物理化学]