The preparation of bifunctional catalysts for oxygen reduction(ORR)and oxygen evolution(OER)is crucial for Zn-air batteries.Here,we report a La doped CoFe_(2)O_(4) spinel catalyst supported on threedimensional graphen...The preparation of bifunctional catalysts for oxygen reduction(ORR)and oxygen evolution(OER)is crucial for Zn-air batteries.Here,we report a La doped CoFe_(2)O_(4) spinel catalyst supported on threedimensional graphene(3D-G),where La can facilitate electron transfer from Co to Fe,leading to increased electron cloud density in Fe and improved catalytic performance.The redshift of the G peak in the Raman spectra indicates the interaction between theπbond of 3D-G and d orbitals in La_(0.2)CoFe_(1.8)O_(4).La_(0.2)CoFe_(1.8)/3D-G exhibits superior ORR performance(E_(1/2)=0.86 V vs.RHE)and OER performance(E_(j=10)=1.55 V vs.RHE)to CoFe_(2)O_(4)/3D-G(E_(1/2)=0.831 V vs.RHE,E_(j=10)=1.603 V vs.RHE).Furthermore,it demonstrates excellent bifunctional oxygen catalytic performance while maintaining high power density and stability in liquid zinc-air batteries(ZABs)and flexible ZABs(F-ZABs).This work presents a viable strategy for utilizing rare earth element doped spinels to enhance oxygen catalyst and ZABs performance.展开更多
描述了鳞毛蕨属一新种，即吉首鳞毛蕨Dryopteris jishouensis G．X．Chen et D．G．Zhang．吉首鳞毛蕨与稀羽鳞毛蕨Dryopterhsparsa（Buch．-Ham．exD．Don）0．Ktze．相似，区别在于本新种形体较小，通常高5～36cm，羽片近对生或互生...描述了鳞毛蕨属一新种，即吉首鳞毛蕨Dryopteris jishouensis G．X．Chen et D．G．Zhang．吉首鳞毛蕨与稀羽鳞毛蕨Dryopterhsparsa（Buch．-Ham．exD．Don）0．Ktze．相似，区别在于本新种形体较小，通常高5～36cm，羽片近对生或互生．裂片边缘全缘且顶端钝圆而无尖齿．囊群盖边缘啮蚀状．展开更多
基金financially supported by the National Natural Science Foundation of China(22172093 and 21776167)the Natural Science Foundation of Shandong Province,China(ZR2023MB061).
文摘The preparation of bifunctional catalysts for oxygen reduction(ORR)and oxygen evolution(OER)is crucial for Zn-air batteries.Here,we report a La doped CoFe_(2)O_(4) spinel catalyst supported on threedimensional graphene(3D-G),where La can facilitate electron transfer from Co to Fe,leading to increased electron cloud density in Fe and improved catalytic performance.The redshift of the G peak in the Raman spectra indicates the interaction between theπbond of 3D-G and d orbitals in La_(0.2)CoFe_(1.8)O_(4).La_(0.2)CoFe_(1.8)/3D-G exhibits superior ORR performance(E_(1/2)=0.86 V vs.RHE)and OER performance(E_(j=10)=1.55 V vs.RHE)to CoFe_(2)O_(4)/3D-G(E_(1/2)=0.831 V vs.RHE,E_(j=10)=1.603 V vs.RHE).Furthermore,it demonstrates excellent bifunctional oxygen catalytic performance while maintaining high power density and stability in liquid zinc-air batteries(ZABs)and flexible ZABs(F-ZABs).This work presents a viable strategy for utilizing rare earth element doped spinels to enhance oxygen catalyst and ZABs performance.
文摘描述了鳞毛蕨属一新种，即吉首鳞毛蕨Dryopteris jishouensis G．X．Chen et D．G．Zhang．吉首鳞毛蕨与稀羽鳞毛蕨Dryopterhsparsa（Buch．-Ham．exD．Don）0．Ktze．相似，区别在于本新种形体较小，通常高5～36cm，羽片近对生或互生．裂片边缘全缘且顶端钝圆而无尖齿．囊群盖边缘啮蚀状．
