1.Introduction Electrodeposited copper is frequently employed as an electrical interconnection material in modern electronic devices owing to its superior conductivity and electromigration resistance[1,2].Reduc-ing th...1.Introduction Electrodeposited copper is frequently employed as an electrical interconnection material in modern electronic devices owing to its superior conductivity and electromigration resistance[1,2].Reduc-ing the electrical resistivity of Cu interconnects is an everlasting pursuit of the industry.For pure Cu,the primary approach to re-ducing its resistivity is to eliminate the crystal defects that scatter the electron transmission,especially grain boundaries(GBs).More-over,GBs are known to be the fast diffusion path for electromi-gration,which may lead to the formation of voids and protrusions[3,4].Therefore,efforts have been devoted to achieving large grains or even single crystals in Cu interconnects.展开更多
The demanding all-in-one electrocatalyst system for oxygen reduction reaction(ORR),oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in zinc-air batteries or water splitting requires elaborate material...The demanding all-in-one electrocatalyst system for oxygen reduction reaction(ORR),oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in zinc-air batteries or water splitting requires elaborate material manufacturing,which is usually complicated and time-consuming.Efficient interface engineering between MXene and highly active electrocatalytic species(CoS_(2))is,herein,achieved by an in situ hydrothermal growth and facile sulfurization process.The CoS_(2)@MXene electrocatalyst is composed by one-dimensional CoS_(2)nanowires and two-dimensional MXene nanosheets,which lead to a hierarchical structure(large specific surface area and abundant active sites),a spatial electron redistribution(high intrinsic activity),and high anchoring strength(superior performance stability).Therefore,the electrocatalyst achieves enhanced catalytic activity and longtime stability for ORR(a half-wave potential of 0.80 V),OER(an overpotential of 270 mV at 10 mA cm^(-2),i.e.,η10=270 mV)and HER(η10=175 mV).Furthermore,the asymmetry water splitting system based on the CoS_(2)@MXene composites delivers a low overall voltage of 1.63 V at 10 mA cm^(-2).The solidstate zinc-air batteries using CoS_(2)@MXene as the air cathode display a small charge-discharge voltage gap(0.53 V at1 mA cm^(-2))and superior stability(60 circles and 20-h continuous test).The energy interconversion between the chemical energy and electricity can be achieved by a self-powered system via integrating the water splitting system and quasisolid-state zinc-air batteries.Supported by in situ Raman analyses,the formation of cobalt oxyhydroxide species provides the active sites for water oxidation.This study paves apromising avenue for the design and application of multifunctional nanocatalysts.展开更多
基金sponsored by the National Natural Science Foun-dation of China(Nos.62004124,22372100,and 51991374).
文摘1.Introduction Electrodeposited copper is frequently employed as an electrical interconnection material in modern electronic devices owing to its superior conductivity and electromigration resistance[1,2].Reduc-ing the electrical resistivity of Cu interconnects is an everlasting pursuit of the industry.For pure Cu,the primary approach to re-ducing its resistivity is to eliminate the crystal defects that scatter the electron transmission,especially grain boundaries(GBs).More-over,GBs are known to be the fast diffusion path for electromi-gration,which may lead to the formation of voids and protrusions[3,4].Therefore,efforts have been devoted to achieving large grains or even single crystals in Cu interconnects.
基金supported by the National Natural Science Foundation of China(51871119 and 51901100)the High-Level Entrepreneurial and Innovative Talents Program of Jiangsu Province,Jiangsu Provincial Funds for Natural Science Foundation(BK20170793 and BK20180015)+2 种基金the Six Talent Peak Project of Jiangsu Province(2018-XCL-033)China Postdoctoral Science Foundation(2018M640481 and 2019T120426)the Foundation of Graduation Innovation Center in NUAA(kfjj20190609)。
文摘The demanding all-in-one electrocatalyst system for oxygen reduction reaction(ORR),oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in zinc-air batteries or water splitting requires elaborate material manufacturing,which is usually complicated and time-consuming.Efficient interface engineering between MXene and highly active electrocatalytic species(CoS_(2))is,herein,achieved by an in situ hydrothermal growth and facile sulfurization process.The CoS_(2)@MXene electrocatalyst is composed by one-dimensional CoS_(2)nanowires and two-dimensional MXene nanosheets,which lead to a hierarchical structure(large specific surface area and abundant active sites),a spatial electron redistribution(high intrinsic activity),and high anchoring strength(superior performance stability).Therefore,the electrocatalyst achieves enhanced catalytic activity and longtime stability for ORR(a half-wave potential of 0.80 V),OER(an overpotential of 270 mV at 10 mA cm^(-2),i.e.,η10=270 mV)and HER(η10=175 mV).Furthermore,the asymmetry water splitting system based on the CoS_(2)@MXene composites delivers a low overall voltage of 1.63 V at 10 mA cm^(-2).The solidstate zinc-air batteries using CoS_(2)@MXene as the air cathode display a small charge-discharge voltage gap(0.53 V at1 mA cm^(-2))and superior stability(60 circles and 20-h continuous test).The energy interconversion between the chemical energy and electricity can be achieved by a self-powered system via integrating the water splitting system and quasisolid-state zinc-air batteries.Supported by in situ Raman analyses,the formation of cobalt oxyhydroxide species provides the active sites for water oxidation.This study paves apromising avenue for the design and application of multifunctional nanocatalysts.
