We present a one-pot colloidal synthesis method for producing monodisperse multi-metal(Co,Mn,and Fe)spinel nanocrystals(NCs),including nanocubes,nano-octahedra,and concave nanocubes.This study explores the mechanism o...We present a one-pot colloidal synthesis method for producing monodisperse multi-metal(Co,Mn,and Fe)spinel nanocrystals(NCs),including nanocubes,nano-octahedra,and concave nanocubes.This study explores the mechanism of morphology control,showcasing the pivotal roles of metal precursors and capping ligands in determining the exposed crystal planes on the NC surface.The cubic spinel NCs,terminated with exclusive{100}-facets,demonstrate superior electrocatalytic activity for the oxygen reduction reaction(ORR)in alkaline media compared to their octahedral and concave cubic counterparts.Specifically,at 0.85 V,(CoMn)Fe_(2)O_(4) spinel oxide nanocubes achieve a high mass activity of 23.9 A/g and exhibit excellent stability,highlighting the promising ORR performance associated with{100}-facets of multi-metal spinel oxides over other low-index and high-index facets.Motivated by exploring the correlation between ORR performance and surface atom arrangement(active sites),surface element composition,as well as other factors,this study introduces a prospective approach for shapecontrolled synthesis of advanced spinel oxide NCs.It underscores the significance of catalyst shape control and suggests potential applications as nonprecious metal ORR electrocatalysts.展开更多
基金National Science Foundation,Division of Materials Research,Grant/Award Numbers:DMR-1808383,DMR-2347030,DMR-1905422Department of Energy,Basic Energy Sciences,Grant/Award Number:DE-SC0012704。
文摘We present a one-pot colloidal synthesis method for producing monodisperse multi-metal(Co,Mn,and Fe)spinel nanocrystals(NCs),including nanocubes,nano-octahedra,and concave nanocubes.This study explores the mechanism of morphology control,showcasing the pivotal roles of metal precursors and capping ligands in determining the exposed crystal planes on the NC surface.The cubic spinel NCs,terminated with exclusive{100}-facets,demonstrate superior electrocatalytic activity for the oxygen reduction reaction(ORR)in alkaline media compared to their octahedral and concave cubic counterparts.Specifically,at 0.85 V,(CoMn)Fe_(2)O_(4) spinel oxide nanocubes achieve a high mass activity of 23.9 A/g and exhibit excellent stability,highlighting the promising ORR performance associated with{100}-facets of multi-metal spinel oxides over other low-index and high-index facets.Motivated by exploring the correlation between ORR performance and surface atom arrangement(active sites),surface element composition,as well as other factors,this study introduces a prospective approach for shapecontrolled synthesis of advanced spinel oxide NCs.It underscores the significance of catalyst shape control and suggests potential applications as nonprecious metal ORR electrocatalysts.
