We successfully synthesize a series of polycrystalline CeRuxFe1-xCe3（0≤x≤0.5）samples,which are characterized using powder x-ray diffraction,resistivity and specific heat measurements.The expansion of the lattice c...We successfully synthesize a series of polycrystalline CeRuxFe1-xCe3（0≤x≤0.5）samples,which are characterized using powder x-ray diffraction,resistivity and specific heat measurements.The expansion of the lattice constants with increasing x demonstrates the successful doping of Ru into the CeFeGe3 lattice.Upon doping,it is found that the temperature up to which Landau-Fermi liquid behavior is observed in the resistivity is reduced.Meanwhile,there is also a pronounced increase in the resistivity coefficient and residual resistivity,as well as a clear upturn in C/T at low temperatures,suggesting that Ru doping may tune the system towards a quantum critical point.展开更多
At present,Ru dopants mainly enhance electrocatalytic performance by inducing strain,vacancy,local electron difference,and synergy.Surprisingly,this work innovatively proposes that trace Ru atoms induce dual-reconstru...At present,Ru dopants mainly enhance electrocatalytic performance by inducing strain,vacancy,local electron difference,and synergy.Surprisingly,this work innovatively proposes that trace Ru atoms induce dual-reconstruction of phosphide by regulating the electronic configuration and proportion of Co–P/Co–O species,and ultimately activate superb electrocatalytic performance.Specifically,Ru-CoFeP@C/nickel foam(NF)is reconstructed to generate hydrophilic Co(OH)_(2)nanosheets during the hydrogen evolution reaction(HER)process,further accelerating the alkaline HER kinetics of phosphide.And the as-formed CoOOH during the oxygen evolution reaction(OER)process directly accelerates the oxygen overflow efficiency.As expected,the overpotential at 100 mA·cm^(−2)(η100)values of the reconstructed Ru-CoFeP@C/NF are 0.104 and 0.257 V for HER and OER,which are greatly lower than that of Pt/C-NF and RuO_(2)-NF benchmarks,respectively.This work provides guidance for the construction of highperformance catalysts for HER and OER dual reconstruction.This work provides a new idea for the optimization of catalyst structure and electrocatalytic performance.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11474251,11604291 and U1632275the National Key Research and Development Program of China under Grant Nos 2017YFA0303100 and 2016YFA0300202the Science Challenge Project of China under Grant No TZ2016004
文摘We successfully synthesize a series of polycrystalline CeRuxFe1-xCe3（0≤x≤0.5）samples,which are characterized using powder x-ray diffraction,resistivity and specific heat measurements.The expansion of the lattice constants with increasing x demonstrates the successful doping of Ru into the CeFeGe3 lattice.Upon doping,it is found that the temperature up to which Landau-Fermi liquid behavior is observed in the resistivity is reduced.Meanwhile,there is also a pronounced increase in the resistivity coefficient and residual resistivity,as well as a clear upturn in C/T at low temperatures,suggesting that Ru doping may tune the system towards a quantum critical point.
基金supported by the National Natural Science Foundation of China(Nos.52072197 and 21971132)the 111 Project of China(No.D20017)+5 种基金Outstanding Youth Foundation of Shandong Province,China(No.ZR2019JQ14)Natural Science Foundation of Shandong Province,China(No.ZR2022QE098)Major Scientific and Technological Innovation Project(No.2019JZZY020405)Major Basic Research Program of Natural Science Foundation of Shandong Province under Grant(No.ZR2020ZD09)Qingdao Postdoctoral Researcher Applied Research Project(No.04030431060100)Postdoctoral Innovation Project of Shandong Province(No.SDCX-ZG-20220307).
文摘At present,Ru dopants mainly enhance electrocatalytic performance by inducing strain,vacancy,local electron difference,and synergy.Surprisingly,this work innovatively proposes that trace Ru atoms induce dual-reconstruction of phosphide by regulating the electronic configuration and proportion of Co–P/Co–O species,and ultimately activate superb electrocatalytic performance.Specifically,Ru-CoFeP@C/nickel foam(NF)is reconstructed to generate hydrophilic Co(OH)_(2)nanosheets during the hydrogen evolution reaction(HER)process,further accelerating the alkaline HER kinetics of phosphide.And the as-formed CoOOH during the oxygen evolution reaction(OER)process directly accelerates the oxygen overflow efficiency.As expected,the overpotential at 100 mA·cm^(−2)(η100)values of the reconstructed Ru-CoFeP@C/NF are 0.104 and 0.257 V for HER and OER,which are greatly lower than that of Pt/C-NF and RuO_(2)-NF benchmarks,respectively.This work provides guidance for the construction of highperformance catalysts for HER and OER dual reconstruction.This work provides a new idea for the optimization of catalyst structure and electrocatalytic performance.
