In our work,we demonstrated network PtCu nanocrystals,in which the tuneable composition,clean surface,and ultrasmall size(diameter<5 nm)endow them with excellent electrocatalytic performances in both N_(2)reduction...In our work,we demonstrated network PtCu nanocrystals,in which the tuneable composition,clean surface,and ultrasmall size(diameter<5 nm)endow them with excellent electrocatalytic performances in both N_(2)reduction reaction under ambient conditions and methanol oxidation.A detailed investigation suggests that their electrocatalytic activity is highly composition dependent.We confirmed the production of NH3 from N_(2)through a systematic study.The optimum Pt_(6)Cu nanoalloys exhibit 2.3-fold and 20.6-fold increase in reduction activity toward N_(2)compared with Pt and Cu nanocrystals.Their faradaic efficiency value was also highly improved.Moreover,these bifunctional Pt_(6)Cu nanostructures also show excellent catalytic properties during methanol electrooxidation.The specific activity toward methanol oxidation reaches up to 21.3 mA cm^(−2),which is 3.6 times that of commercial Pt/C catalysts.This work thus provides a promising approach to design the alloy composition for bi-or multi-functional applications.展开更多
基金supported by the National Natural Science Foundation of China(21871005 and 21501005).
文摘In our work,we demonstrated network PtCu nanocrystals,in which the tuneable composition,clean surface,and ultrasmall size(diameter<5 nm)endow them with excellent electrocatalytic performances in both N_(2)reduction reaction under ambient conditions and methanol oxidation.A detailed investigation suggests that their electrocatalytic activity is highly composition dependent.We confirmed the production of NH3 from N_(2)through a systematic study.The optimum Pt_(6)Cu nanoalloys exhibit 2.3-fold and 20.6-fold increase in reduction activity toward N_(2)compared with Pt and Cu nanocrystals.Their faradaic efficiency value was also highly improved.Moreover,these bifunctional Pt_(6)Cu nanostructures also show excellent catalytic properties during methanol electrooxidation.The specific activity toward methanol oxidation reaches up to 21.3 mA cm^(−2),which is 3.6 times that of commercial Pt/C catalysts.This work thus provides a promising approach to design the alloy composition for bi-or multi-functional applications.
