Metal oxide anode material is one of promising candidates for the next-generation LIBs, due to its high theoretical capacity and low cost. The poor conductivity and huge volume change during charge/ discharge, however...Metal oxide anode material is one of promising candidates for the next-generation LIBs, due to its high theoretical capacity and low cost. The poor conductivity and huge volume change during charge/ discharge, however, restrict the commercialization of metal oxide anode material. In this work, we design a novel Cu-SnO2 composite derived from Cu6Sn5 alloy with three dimensional （3D） metal cluster conducting architecture. The novel Cu structure penetrates in the composite particles inducing high conductivity and space-confined SnO2, which restrict the pulverization of SnO2 during lithiation/ delithiation process. The optimized Cu-SnO2 composite anode delivers an initial discharge capacity of 933.7 mA h/g and retains a capacity of 536.1 mA h/g after 200 cycles, at 25℃ and a rate of 100 mA/g. Even at the high rate of 300 mA/g, the anode still exhibits a capacity of more than 29% of that tested at 50 mA/g. Combining with the phase and morphology analysis, the novel Cu-SnO2 composite not only has good electrical conductivity, but also possesses high theoretical capacity （995 mAh/g）, which may pave a new way for the design and construction of next-generation metal oxide anode materials with high power and cycling stability.展开更多
Seawater electrolysis is one most promising development directions for future hydrogen energy.How-ever,big challenges of active site poisoning,chloride oxidation(ClOR),and chloride corrosion on anode electrocatalysts,...Seawater electrolysis is one most promising development directions for future hydrogen energy.How-ever,big challenges of active site poisoning,chloride oxidation(ClOR),and chloride corrosion on anode electrocatalysts,seriously impede seawater electrolysis development.Therefore,developing efficient an-odic oxygen evolution reaction(OER)electrocatalysts is an urgent task for seawater electrolysis.The ad-vanced strategies of improving OER kinetics,lowering ClOR kinetics,strengthening corrosion resistance,and recombining multifunction are summarized and analyzed to help researchers quickly grasp the re-cent progress on seawater oxidation.The outlooks for future research are put forward.The future research directions are proposed as internal and external cultivation,giving full play to the physicochemical prop-erties of electrocatalysts,making sense of structure evolution and OER mechanism,and elucidating the electrical double layer of electrocatalysts.A lot of room for scalable application of seawater electrolysis calls for persistent effort and devotion of related researchers to boost seawater electrolysis development and universal hydrogen energy application.展开更多
Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion batteries.However,the thorough exploration of 3D architectur...Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion batteries.However,the thorough exploration of 3D architecture with a facile strategy is still challenging.Here we report that a polycrystalline Cu_(2-x)Se film was epitaxial grown on(220)facets-exposed Cu by direct selenization of a nanoporous Cu skeleton,which is obtained by dealloying rolled Cu Mn@Cu alloy foil.Density functional theory calculation result shows strong adsorption energy for Se atoms on Cu(220)planes during selenization reaction,rendering a low energy consumption.By virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation,the nanoporous Cu_(2-x)Se@Cu-0.15 composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6μAh/cm^(2)at 50μA/cm^(2),suprior rate capability of 457.6μAh/cm^(2)at 500μA/cm^(2),as well as an ultra-long stability at a high current density.Mechanism investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different intermediates.This novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.展开更多
The report mainly analyzes whether the inverter system could improve the efficiency of converting new energy into factory electricity based on McLuhan’s laws of media theory.Firstly,the report asserts the significanc...The report mainly analyzes whether the inverter system could improve the efficiency of converting new energy into factory electricity based on McLuhan’s laws of media theory.Firstly,the report asserts the significance of using new energy and the importance of utilizing the inverter system to improve the power conversion of new energy in factories.Secondly,it mainly describes McLuhan’s theory from four different aspects.In addition,according to the four aspects of McLuhan’s theory,the rationality and feasibility of the inverter system solution are analyzed.Then,it is concluded that the inverter system can well improve the conversion efficiency of new energy generation in factories.Finally,this paper claims suggestions from two different perspectives to promote the development of the inverter system..展开更多
基金financial supports for this research from the Natural Science Foundation of Tianjin (No. 16JCYBJC41700)Tianjin Major Program of New Materials Science and Technology (Nos. 16ZXCLGX00070, 16ZXCLGX00110)+2 种基金Tianjin Municipal Education Committee Scientific Research Projects (No. 2017KJ075)the National Nature Science Foundation of China (No. 21676200)Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education (Tianjin University)
文摘Metal oxide anode material is one of promising candidates for the next-generation LIBs, due to its high theoretical capacity and low cost. The poor conductivity and huge volume change during charge/ discharge, however, restrict the commercialization of metal oxide anode material. In this work, we design a novel Cu-SnO2 composite derived from Cu6Sn5 alloy with three dimensional （3D） metal cluster conducting architecture. The novel Cu structure penetrates in the composite particles inducing high conductivity and space-confined SnO2, which restrict the pulverization of SnO2 during lithiation/ delithiation process. The optimized Cu-SnO2 composite anode delivers an initial discharge capacity of 933.7 mA h/g and retains a capacity of 536.1 mA h/g after 200 cycles, at 25℃ and a rate of 100 mA/g. Even at the high rate of 300 mA/g, the anode still exhibits a capacity of more than 29% of that tested at 50 mA/g. Combining with the phase and morphology analysis, the novel Cu-SnO2 composite not only has good electrical conductivity, but also possesses high theoretical capacity （995 mAh/g）, which may pave a new way for the design and construction of next-generation metal oxide anode materials with high power and cycling stability.
基金Financial support by the Natural Science Foundation of Hebei Province(No.B2021208030)the College Students Innovation Training Program(Nos.202206224 and S2021113409001)the Improve the Innovation Capability of Heibei Province(No.225A4404D).
文摘Seawater electrolysis is one most promising development directions for future hydrogen energy.How-ever,big challenges of active site poisoning,chloride oxidation(ClOR),and chloride corrosion on anode electrocatalysts,seriously impede seawater electrolysis development.Therefore,developing efficient an-odic oxygen evolution reaction(OER)electrocatalysts is an urgent task for seawater electrolysis.The ad-vanced strategies of improving OER kinetics,lowering ClOR kinetics,strengthening corrosion resistance,and recombining multifunction are summarized and analyzed to help researchers quickly grasp the re-cent progress on seawater oxidation.The outlooks for future research are put forward.The future research directions are proposed as internal and external cultivation,giving full play to the physicochemical prop-erties of electrocatalysts,making sense of structure evolution and OER mechanism,and elucidating the electrical double layer of electrocatalysts.A lot of room for scalable application of seawater electrolysis calls for persistent effort and devotion of related researchers to boost seawater electrolysis development and universal hydrogen energy application.
基金financially supported by the National Natural Science Foundation of China(Nos.52271011,52102291,52101251)。
文摘Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion batteries.However,the thorough exploration of 3D architecture with a facile strategy is still challenging.Here we report that a polycrystalline Cu_(2-x)Se film was epitaxial grown on(220)facets-exposed Cu by direct selenization of a nanoporous Cu skeleton,which is obtained by dealloying rolled Cu Mn@Cu alloy foil.Density functional theory calculation result shows strong adsorption energy for Se atoms on Cu(220)planes during selenization reaction,rendering a low energy consumption.By virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation,the nanoporous Cu_(2-x)Se@Cu-0.15 composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6μAh/cm^(2)at 50μA/cm^(2),suprior rate capability of 457.6μAh/cm^(2)at 500μA/cm^(2),as well as an ultra-long stability at a high current density.Mechanism investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different intermediates.This novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.
文摘The report mainly analyzes whether the inverter system could improve the efficiency of converting new energy into factory electricity based on McLuhan’s laws of media theory.Firstly,the report asserts the significance of using new energy and the importance of utilizing the inverter system to improve the power conversion of new energy in factories.Secondly,it mainly describes McLuhan’s theory from four different aspects.In addition,according to the four aspects of McLuhan’s theory,the rationality and feasibility of the inverter system solution are analyzed.Then,it is concluded that the inverter system can well improve the conversion efficiency of new energy generation in factories.Finally,this paper claims suggestions from two different perspectives to promote the development of the inverter system..
