Pt nanodendrites with a PtIr alloy surface structure exhibit excellent stability toward acidic hydrogen evolution reaction  

作　　者：Chang Liu Zongnan Wei Minna Cao Rong Cao 

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China

出　　处：《Nano Research》2024年第6期4844-4849,共6页纳米研究（英文版）

基　　金：the National Key R&D Program of China(No.2018YFA0704502);the National Key Research and Development Project of China(No.2022YFA1503900);the NSFC(Nos.22033008 and 22220102005);Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZZ103).

摘　　要：The development of effective and stable electrocatalysts for the hydrogen evolution reaction(HER)in acidic electrolytes is a significant challenge.In this work,homogeneous Pt nanodendrites(Pt NDs)with a PtIr shell were successfully synthesized by a two-step wet chemical method.This open three-dimensional(3D)dendritic structure exhibited exceptional electrocatalytic characteristics,exposing as many active sites as feasible.Furthermore,by alloying Ir with Pt on the surface,catalytic activity was greatly enhanced while ensuring extremely high stability.Iridium surface-enriched platinum nanodendritic catalysts(Pt@PtIr NDs)outperformed the control samples and the commercial catalysts.In acidic HER test,Pt@PtIr NDs had a lower overpotential(22 mV)than Pt NDs(26 mV)and commercial Pt/C(31 mV)at 10 mA/cm^(2),and the activity of Pt@PtIr NDs remained consistent even after undergoing a continuous durability test for at least 168 h,which was much superior to the performance of commercial Pt/C(10 h)under identical test conditions.This study revealed that the application of 3D Pt dendritic metal alloys may offer a chance for the development of enhanced electrocatalysts in acidic HER.

关 键 词：Pt nanodendrites IRIDIUM high stability hydrogen evolution reaction ALLOY 

分 类 号：TQ116.2[化学工程—无机化工] TB383[一般工业技术—材料科学与工程]