This study successfully developed a series of carbon-sol-reinforced copper(Cu-CS)composite coatings by electrodeposition employing a superiorly dispersed carbon sol(CS)to avoid nanoparticle aggregation.The CS,characte...This study successfully developed a series of carbon-sol-reinforced copper(Cu-CS)composite coatings by electrodeposition employing a superiorly dispersed carbon sol(CS)to avoid nanoparticle aggregation.The CS,characterized using transmission electron microscopy and zeta potential analysis,consisted of carbon particles with an approximate diameter of 300 nm uniformly distributed in the electrolytes.The characteristics of the composite coatings were examined via scanning electron microscopy to observe its microstructures,X-ray diffraction to detect its phase constituents,and durability testing to determine the wear and corrosion resistance.Results indicated a significant improvement in coating thickness,density,and uniformity achieved for the Cu-CS composite coating with the addition of 20m L/L CS.Moreover,the Cu-CS composite coating exhibited a low wear volume(1.15×10^(-3)mm^(3)),a high hardness(HV_(0.5)137.1),and a low corrosion rate(0.191 mm/a).The significant contribution of carbon particles to the improvement of coating performance is mainly influenced by two factors,namely,the strengthening and lubricating effects resulting from the incorporated carbon particles.Nevertheless,overdosage of CS can compromise the microstructure of the Cu-CS composite coating,creating defects and undermining its functionality.展开更多
Tin sulfide(SnS_(2))anodes have garnered significant attention within emerging energy storage technologies.However,the application of SnS_(2)is curtailed due to its inherent limitations,including poor cyclic stability...Tin sulfide(SnS_(2))anodes have garnered significant attention within emerging energy storage technologies.However,the application of SnS_(2)is curtailed due to its inherent limitations,including poor cyclic stability and inevitable volumetric expansion upon cycling.This study reports the successful fabrication of an innovative SnS_(2)-based composite,featuring an eggshell-like structured nitrogen-doped carbon coating,referred to as SnS_(2)@NxC.This novel architecture,wherein SnS_(2)acts as the core encapsulated by a nitrogen-doped carbon shell,characterized by a void space between the shell and core,is crucial in mitigating volumetric expansion.This configuration contributes to maintaining the structural integrity of the composite materials,even under the stresses of continuous cycling.Nitrogen within the carbon matrix enhances conductivity and promotes the formation of a more robust and stable solid electrolyte interphase(SEI)layer.Experimental investigations have substantiated the electrochemical superiority of the SnS_(2)@NxC electrode,demonstrating a specific capacity of 701.8 mA·h·g^(-1)after 1000 cycles at 0.5 A·g^(-1)and maintaining a capacity of 597.2mA·h·g^(-1)after 400 cycles at a heightened current density of 2 A·g^(-1).These findings underscore the exceptional cyclic performance and durability of the SnS_(2)@NxC electrode.展开更多
基金financially supported by the Jiangsu Provincial Outstanding Overseas Talent Project,China(No.BX2023029)the Jiangsu Provincial Natural Science Fund Research Project,China(No.BK20211344)+2 种基金the Project of Jiangsu Provincial Department of Science and Technology,Chinathe Jiangsu Provincial Postgraduate Research&Practice Innovation Program,China(No.KYCX22_3795)the Jiangsu Provincial Postgraduate Research&Practice Innovation Program,China(No.SJCX23_2171)。
文摘This study successfully developed a series of carbon-sol-reinforced copper(Cu-CS)composite coatings by electrodeposition employing a superiorly dispersed carbon sol(CS)to avoid nanoparticle aggregation.The CS,characterized using transmission electron microscopy and zeta potential analysis,consisted of carbon particles with an approximate diameter of 300 nm uniformly distributed in the electrolytes.The characteristics of the composite coatings were examined via scanning electron microscopy to observe its microstructures,X-ray diffraction to detect its phase constituents,and durability testing to determine the wear and corrosion resistance.Results indicated a significant improvement in coating thickness,density,and uniformity achieved for the Cu-CS composite coating with the addition of 20m L/L CS.Moreover,the Cu-CS composite coating exhibited a low wear volume(1.15×10^(-3)mm^(3)),a high hardness(HV_(0.5)137.1),and a low corrosion rate(0.191 mm/a).The significant contribution of carbon particles to the improvement of coating performance is mainly influenced by two factors,namely,the strengthening and lubricating effects resulting from the incorporated carbon particles.Nevertheless,overdosage of CS can compromise the microstructure of the Cu-CS composite coating,creating defects and undermining its functionality.
文摘Tin sulfide(SnS_(2))anodes have garnered significant attention within emerging energy storage technologies.However,the application of SnS_(2)is curtailed due to its inherent limitations,including poor cyclic stability and inevitable volumetric expansion upon cycling.This study reports the successful fabrication of an innovative SnS_(2)-based composite,featuring an eggshell-like structured nitrogen-doped carbon coating,referred to as SnS_(2)@NxC.This novel architecture,wherein SnS_(2)acts as the core encapsulated by a nitrogen-doped carbon shell,characterized by a void space between the shell and core,is crucial in mitigating volumetric expansion.This configuration contributes to maintaining the structural integrity of the composite materials,even under the stresses of continuous cycling.Nitrogen within the carbon matrix enhances conductivity and promotes the formation of a more robust and stable solid electrolyte interphase(SEI)layer.Experimental investigations have substantiated the electrochemical superiority of the SnS_(2)@NxC electrode,demonstrating a specific capacity of 701.8 mA·h·g^(-1)after 1000 cycles at 0.5 A·g^(-1)and maintaining a capacity of 597.2mA·h·g^(-1)after 400 cycles at a heightened current density of 2 A·g^(-1).These findings underscore the exceptional cyclic performance and durability of the SnS_(2)@NxC electrode.
