With O_2 and CO as the molecular probes,the reactivity of oxygen species of perovskite-like oxides SmMnO_3 and SmFeO_3 was studied by thermodesorption spectroscopy(TDS)and temperature- programmed reaction spectroscopy...With O_2 and CO as the molecular probes,the reactivity of oxygen species of perovskite-like oxides SmMnO_3 and SmFeO_3 was studied by thermodesorption spectroscopy(TDS)and temperature- programmed reaction spectroscopy(TPRS)in an ultrahigh vacuum system.The results of the experiment implied that the oxidation of CO on SmMO_3 may follow Langmuir-Hinshelwood mechanism.展开更多
Rare earth metal based perovskite emerges as important catalytic material for energy production and storage.These ABO_(3) type materials are now the focus of research in the field of oxygen reduction and evolution rea...Rare earth metal based perovskite emerges as important catalytic material for energy production and storage.These ABO_(3) type materials are now the focus of research in the field of oxygen reduction and evolution reactions.Here,in this work we evaluated the oxygen reduction properties of the synthesized one-dimensional REMnO_(3)(RE=Pr,Nd,Sm,Eu and Gd).The one-dimensional REMnO_(3) prepared by the hydrothermal synthesis route results in pure phase perovskite on calcinations.The perovskite was characte rized with X-ray diffraction,Fourier transform-infrared(FT-IR),field emission-scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS).The oxygen reduction reaction activities were investigated with the help of electrochemical workstation that consists of three-electrode system immersed in 0.1 mol/L KOH electrolyte solution saturated with oxygen.The Koutechy-Levich plot obtained from rotating ring disk electrode shows all the prepared catalysts follow 4e^(-)processes during oxygen reduction.The effect of "A" site cation variation in REMnO3 on oxygen reduction reaction is discussed.SmMnO_(3) showed better onset potential for oxygen reduction reaction among the prepared rare earth perovskite.SmMnO_(3) having high RE:Mn ratio(A-site rich co mpositions) promotes oxygen reduction reaction(ORR) activity.All the perovs kites showed good oxygen reduction property with high stability and methanol tolerance.展开更多
文摘With O_2 and CO as the molecular probes,the reactivity of oxygen species of perovskite-like oxides SmMnO_3 and SmFeO_3 was studied by thermodesorption spectroscopy(TDS)and temperature- programmed reaction spectroscopy(TPRS)in an ultrahigh vacuum system.The results of the experiment implied that the oxidation of CO on SmMO_3 may follow Langmuir-Hinshelwood mechanism.
基金Project supported by Council of Scientific&Industrial Research (01/3089/21)the Centre of Excellence in Environment and Public Health by the Higher Education Department,Government of Odisha (Grant No.:26913/HED/HE-PTC-WB-02-17)。
文摘Rare earth metal based perovskite emerges as important catalytic material for energy production and storage.These ABO_(3) type materials are now the focus of research in the field of oxygen reduction and evolution reactions.Here,in this work we evaluated the oxygen reduction properties of the synthesized one-dimensional REMnO_(3)(RE=Pr,Nd,Sm,Eu and Gd).The one-dimensional REMnO_(3) prepared by the hydrothermal synthesis route results in pure phase perovskite on calcinations.The perovskite was characte rized with X-ray diffraction,Fourier transform-infrared(FT-IR),field emission-scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS).The oxygen reduction reaction activities were investigated with the help of electrochemical workstation that consists of three-electrode system immersed in 0.1 mol/L KOH electrolyte solution saturated with oxygen.The Koutechy-Levich plot obtained from rotating ring disk electrode shows all the prepared catalysts follow 4e^(-)processes during oxygen reduction.The effect of "A" site cation variation in REMnO3 on oxygen reduction reaction is discussed.SmMnO_(3) showed better onset potential for oxygen reduction reaction among the prepared rare earth perovskite.SmMnO_(3) having high RE:Mn ratio(A-site rich co mpositions) promotes oxygen reduction reaction(ORR) activity.All the perovs kites showed good oxygen reduction property with high stability and methanol tolerance.
