通过化学镀法制备了具有"三明治夹心"结构的Ni-P@Ni-B/Ni催化电极.该催化材料为直径1μm左右的微球.电化学性能测试结果表明,在电流密度为10 m A/cm^2时,其在0.5 mol/L PBS缓冲液(pH=7)中的过电位仅为287 m V,在此电位下连续...通过化学镀法制备了具有"三明治夹心"结构的Ni-P@Ni-B/Ni催化电极.该催化材料为直径1μm左右的微球.电化学性能测试结果表明,在电流密度为10 m A/cm^2时,其在0.5 mol/L PBS缓冲液(pH=7)中的过电位仅为287 m V,在此电位下连续工作24 h后,电流密度仅衰减了7.6%.同时Ni-P@Ni-B/Ni在酸性(0.5 mol/L H2SO4)和碱性(1 mol/L KOH)条件下也具有优异的析氢反应催化活性,达到相同电流密度时过电位分别为199和79 m V.该工作为全p H环境下高效电解水制氢提供了新思路.展开更多
Beta Ti−35Nb sandwich-structured composites with various reinforcing layers were designed and produced using additive manufacturing(AM)to achieve a balance between light weight and high strength.The impact of reinforc...Beta Ti−35Nb sandwich-structured composites with various reinforcing layers were designed and produced using additive manufacturing(AM)to achieve a balance between light weight and high strength.The impact of reinforcing layers on the compressive deformation behavior of porous composites was investigated through micro-computed tomography(Micro-CT)and finite element method(FEM)analyses.The results indicate that the addition of reinforcement layers to sandwich structures can significantly enhance the compressive yield strength and energy absorption capacity of porous metal structures;Micro-CT in-situ observation shows that the strain of the porous structure without the reinforcing layer is concentrated in the middle region,while the strain of the porous structure with the reinforcing layer is uniformly distributed;FEM analysis reveals that the reinforcing layers can alter stress distribution and reduce stress concentration,thereby promoting uniform deformation of the porous structure.The addition of reinforcing layer increases the compressive yield strength of sandwich-structured composite materials by 124%under the condition of limited reduction of porosity,and the yield strength increases from 4.6 to 10.3 MPa.展开更多
文摘通过化学镀法制备了具有"三明治夹心"结构的Ni-P@Ni-B/Ni催化电极.该催化材料为直径1μm左右的微球.电化学性能测试结果表明,在电流密度为10 m A/cm^2时,其在0.5 mol/L PBS缓冲液(pH=7)中的过电位仅为287 m V,在此电位下连续工作24 h后,电流密度仅衰减了7.6%.同时Ni-P@Ni-B/Ni在酸性(0.5 mol/L H2SO4)和碱性(1 mol/L KOH)条件下也具有优异的析氢反应催化活性,达到相同电流密度时过电位分别为199和79 m V.该工作为全p H环境下高效电解水制氢提供了新思路.
基金the Hunan Young Scientific Innovative Talents Program,China(No.2020RC3040)Outstanding Youth Fund of Hunan Natural Science Foundation,China(Nos.2021JJ20011,2021JJ40600,2021JJ40590)the National Natural Science Foundation of China(Nos.52001030,52204371)..
文摘Beta Ti−35Nb sandwich-structured composites with various reinforcing layers were designed and produced using additive manufacturing(AM)to achieve a balance between light weight and high strength.The impact of reinforcing layers on the compressive deformation behavior of porous composites was investigated through micro-computed tomography(Micro-CT)and finite element method(FEM)analyses.The results indicate that the addition of reinforcement layers to sandwich structures can significantly enhance the compressive yield strength and energy absorption capacity of porous metal structures;Micro-CT in-situ observation shows that the strain of the porous structure without the reinforcing layer is concentrated in the middle region,while the strain of the porous structure with the reinforcing layer is uniformly distributed;FEM analysis reveals that the reinforcing layers can alter stress distribution and reduce stress concentration,thereby promoting uniform deformation of the porous structure.The addition of reinforcing layer increases the compressive yield strength of sandwich-structured composite materials by 124%under the condition of limited reduction of porosity,and the yield strength increases from 4.6 to 10.3 MPa.
