摘要
Combining multiple metal elements into one nanostructure merits untold application potential but is still a challenge for the traditional bottom-up synthesis method.Herein,we propose a eutectic-directed self-templating strategy to prepare two multicomponent nanostructured alloys(PtPdRhIrNi(D-SN)and NiPtPdRhIrAl(D-SS))through the combination of rapid solidification with dealloying.The PtPdRhIrNi nanoporous nanowires(NPNWs)represent a new family of high-entropy alloys(HEAs)containing delicate hierarchical nanostructure with ultrafine ligament sizes of~2 nm in addition to one-dimensional(1D)morphology.Moreover,the PtPdRhIrNi NPNWs display excellent electrocatalytic activity and stability toward hydrogen evolution reaction,with the low overpotential of 22 and 55 mV to afford a current density of 10 mA·cm^(−2)in 0.5 M H_(2)SO_(4)and 1.0 M KOH electrolytes,respectively.The enhanced electrocatalytic performance can be attributed to the high-entropy effect favoring the surface electronic structure for the optimized activity,the promotion impact of Ni,1D morphology facilitating the electron transport,and the nanoporous structure promoting the electrolyte diffusion.
基金
supported by the National Natural Science Foundation of China(Nos.51871133 and 51901108)
the Foundation of State Key Laboratory of Biobased Material and Green Papermaking(No.ZZ20210109)
Qilu University of Technology(Shandong Academy of Sciences)
the support of Taishan Scholar Foundation of Shandong Province,and the program of Jinan Science and Technology Bureau(No.2019GXRC001)
We also acknowledge the support of the Outstanding Youth Innovation Team Project of Shandong Provincial University(No.2019KJC014).
