Lotus root-like RuIr alloys with close-packed(0001)branches:Strain-driven performance for acidic water oxidation  

作　　者：Mingyue Xiao Wanli Xu Rongchao Li Yanhui Sun Jingjun Liu Feng Liu Jun Gan Shixin Gao 

机构地区：[1]Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing 100029,China [2]Yunnan Precious Metals Lab,Kunming 650100,Yunnan,China

出　　处：《Journal of Energy Chemistry》2024年第5期579-590,共12页能源化学（英文版）

基　　金：supported by the National Natural Science Funds of China(Grant number 22278016);Science and technology planning project of Yunnan Precious Metals Laboratory(Grant number YPML-2023050204)。

摘　　要：Achieving composition tunability and structure editability of nanoalloys with high level strain may be an efficient strategy to remarkably boost catalytic performance toward oxygen evolution reaction(OER)in acidic water oxidation.Herein,lotus root-like RuIr alloys with native micro-strain were constructed by an epitaxial growth of Ru-richened hcp-(0001)branches on Ir-richened fcc-(111)seeds using a polyol thermal synthesis strategy.The resultant Ru_(60)Ir_(40) alloy shows an OER overpotential of 197 mV at 10 mA cm^(-2) and a Tafel slope of 46.59 mV dec^(-1),showing no obvious activity decay for 80 h continuous chronopotentiometry test in 0.5 M H_(2)SO_(4).The related characterizations including X-ray absorption fine structure(XAFS)spectroscopy and density functional theory(DFT)calculations show that that the remarkably improved activity of the lotus root-like alloy can be attributed to the(0001)facet-triggered strain,which can efficiently optimize the electronic band structure of the active metal and the weakening of the chemisorption of oxygen-containing substances to boost OER electrocatalysis.Therefore,this work provides a new strategy to designing a class of advanced electrocatalysts with high strain using diverse nanostructures as building materials for carbon-free clean energy conversion systems.

关 键 词：Rulr alloy Lotusroot-like structure STRAIN Oxygene volution reaction Activity 

分 类 号：TQ116.2[化学工程—无机化工] TQ426