Telluride tin(SnTe)is a promising conversion-alloying anode for potassium-ion batteries(PIBs)due to its high theoretical specific capacity induced by multi-electron transport reaction and low operating voltage,whereas...Telluride tin(SnTe)is a promising conversion-alloying anode for potassium-ion batteries(PIBs)due to its high theoretical specific capacity induced by multi-electron transport reaction and low operating voltage,whereas huge volume expansion and poor kinetics behavior become key scientific bottleneck limiting the battery performances.Herein,SnTe nanoparticles physicochemically wrapped by graphene and nitrogen-doped carbon(SnTe@rGO@NC)are proposed as anode materials for PIBs.The pre-electrostatic interaction urges the formation of Sn-C and Te-C chemical bonds between SnTe and double carbon to strengthen the interfacial stability and electron transfer,and the conductive architecture with hierarchical encapsulation effect is beneficial to maintaining the electrode integrity and electrochemical dynamics.It is demon-strated from first principles calculations and experimental results that SnTe@rGO@NC contributes fast electron transmission,strong K-ion adsorption,and superior K-ion diffusion capability.Ex-situ characteri-zations uncover that SnTe undergoes conversion-alloying dual-mechanism with the products of K_(2)Te and K_(4)Sn_(23)replied on Sn redox site(23SnTe+50K^(+)+50e^(-)↔K_(4)Sn_(23)+23K_(2)Te).Thus,the SnTe@rGO@NC electrode delivers a high initial charge specific capacity of 243.9 mAh g^(-1)at 50 mA g^(-1),superior rate performance(112.6 mAh g^(-1)at 1.0 A g^(-1)),and outstanding cyclic stability at various current densities.展开更多
PbTe/SnTe hybrid nanocrystals with designed shape, chemical composition and narrow size distribution were synthesized by an efficient solvothermal approach. This approach enables mass and economical synthesis of PbTe-...PbTe/SnTe hybrid nanocrystals with designed shape, chemical composition and narrow size distribution were synthesized by an efficient solvothermal approach. This approach enables mass and economical synthesis of PbTe-based nanocrystals. The organic ligands were completely removed by pretreatment with a super-hydride solution, making it possible to fabricate fully dense and robust thermoelectric devices with increased electrical conductivity.展开更多
基金supported by the National Natural Science Foun-dation of China(No.52207248)China Postdoctoral Science Foun-dation(Nos.2022M722606,2021TQ0266)+2 种基金Natural Science Basic Research Program of Shaanxi(No.2022JQ-113)Guangdong Basic and Applied Basic Research Foundation(Nos.2021A1515110164 and 2022A1515010208)the Fundamental Research Funds for the Central Universities(No.G2020KY0534)。
文摘Telluride tin(SnTe)is a promising conversion-alloying anode for potassium-ion batteries(PIBs)due to its high theoretical specific capacity induced by multi-electron transport reaction and low operating voltage,whereas huge volume expansion and poor kinetics behavior become key scientific bottleneck limiting the battery performances.Herein,SnTe nanoparticles physicochemically wrapped by graphene and nitrogen-doped carbon(SnTe@rGO@NC)are proposed as anode materials for PIBs.The pre-electrostatic interaction urges the formation of Sn-C and Te-C chemical bonds between SnTe and double carbon to strengthen the interfacial stability and electron transfer,and the conductive architecture with hierarchical encapsulation effect is beneficial to maintaining the electrode integrity and electrochemical dynamics.It is demon-strated from first principles calculations and experimental results that SnTe@rGO@NC contributes fast electron transmission,strong K-ion adsorption,and superior K-ion diffusion capability.Ex-situ characteri-zations uncover that SnTe undergoes conversion-alloying dual-mechanism with the products of K_(2)Te and K_(4)Sn_(23)replied on Sn redox site(23SnTe+50K^(+)+50e^(-)↔K_(4)Sn_(23)+23K_(2)Te).Thus,the SnTe@rGO@NC electrode delivers a high initial charge specific capacity of 243.9 mAh g^(-1)at 50 mA g^(-1),superior rate performance(112.6 mAh g^(-1)at 1.0 A g^(-1)),and outstanding cyclic stability at various current densities.
基金supported by the National Natural Science Foundation of China(No.51173074)the Key Project of Chinese Ministry of Education(No.212099)+1 种基金the Promotive Research Fund for Young and Middle-aged Scientists of Shandong Province(No. BS2012CLO10)Toyota Motor Engineering & Manufacturing North America(TEMA) Inc
文摘PbTe/SnTe hybrid nanocrystals with designed shape, chemical composition and narrow size distribution were synthesized by an efficient solvothermal approach. This approach enables mass and economical synthesis of PbTe-based nanocrystals. The organic ligands were completely removed by pretreatment with a super-hydride solution, making it possible to fabricate fully dense and robust thermoelectric devices with increased electrical conductivity.
