本文介绍了亚稳态Fe50Cu50固溶体晶格常数的测量结果,应用金属结构的经典概念并考虑到原子核周围电子密度的高斯型球对称分布,导出了计算金属中一个原子的平均内能和两种不同金属原子相互作用势的普遍公式。对亚稳态Fe50Cu50合金原子相...本文介绍了亚稳态Fe50Cu50固溶体晶格常数的测量结果,应用金属结构的经典概念并考虑到原子核周围电子密度的高斯型球对称分布,导出了计算金属中一个原子的平均内能和两种不同金属原子相互作用势的普遍公式。对亚稳态Fe50Cu50合金原子相互作用势作计算,得到平衡时fcc-FeCu的晶格常数为0 36433nm与实验测量结果接近,也与H R Gong等人对亚稳态FeCu合金的研究结论一致,证实了亚稳态Fe50Cu50合金是以fcc结构形式存在的固溶体。展开更多
Catalytic conversion of CO_(2) to high-value products is a crucial method to achieve targets of carbon dioxide emissions peak and carbon neutralization.However,realizing a controllable product distribution in a single...Catalytic conversion of CO_(2) to high-value products is a crucial method to achieve targets of carbon dioxide emissions peak and carbon neutralization.However,realizing a controllable product distribution in a single CO_(2) hydrogenation process is of great challenge.Herein,we prepared the CuFe nanoalloy catalyst that directly transforms CO_(2) to alkanes using physical sputtering method in mild condition.The characteristic results show that the proximity between Cu and Fe is the crucial factor to tunable products among the different catalysts.The formation of unique coordination of FeCu4 nanoalloys from high-energy sputtering process provides close interaction between Cu and Fe,which is favorable to formation of low carbon paraffin,however,a distant proximity and weak interaction will increase the selectivity of olefins and alcohols.This work provides a general strategy for tuning target chemicals and enriches the viewpoints in CO_(2) hydrogenation.展开更多
Given the clean and inexhaustible solar energy from solar light,photocatalytic ammonia synthesis is extremely appealing.However,high electron-hole recombination rates and insufficient active sites severely limited N2 ...Given the clean and inexhaustible solar energy from solar light,photocatalytic ammonia synthesis is extremely appealing.However,high electron-hole recombination rates and insufficient active sites severely limited N2 photoreaction reduction.Herein,we designed and fabricated FeCu alloy nanoparticles anchored on carbon nitride nanosheets with excellent photocatalyt ic ammonia synthesis performance.As a coupler between Fe and carbon nitride,Cu promotes the separation of photogenerated charge carriers in carbon nitride under solar light irradiation,and renters the semiconductor a forceful electron donor for the Fe active sites.The accumulated electrons at Fe sites furtherly facilitated the adsorption and activation of the molecular nitrogen.Besides,the uniform dispersed FeCu alloy nanoparticles were on carbon nitride nanosheets enhanced the stability of photocataly tic nitrogen reduction reaction,making the artificial photocataly tic ammonia synthesis more sustainable for application.This work highlights that a direct electron transfer channel can be used to regulate the photochemical nitrogen fixation network.展开更多
The reaction precursors were synthesised by solid state reaction of H 2C 2O 4·2H 2O with NiSO 4·6H 2O and Fe(NO 3) 3·9H 2O,CuSO 4·5H 2O,at room temperature.The brown black nanomater Ni 1.5 FeCu 2.5...The reaction precursors were synthesised by solid state reaction of H 2C 2O 4·2H 2O with NiSO 4·6H 2O and Fe(NO 3) 3·9H 2O,CuSO 4·5H 2O,at room temperature.The brown black nanomater Ni 1.5 FeCu 2.5 O 5.5 with the averages of 60nm was obtained by decomposition of precursors CuC 2O 4·2H 2O,Fe 2(C 2O 4) 3·5H 2O,and NiC 2O 4·2H 2O for about 3 hour at 410℃.The composition,size,appearance and properties of the product was studied by TG,XRD,TEM and SEM.展开更多
文摘本文介绍了亚稳态Fe50Cu50固溶体晶格常数的测量结果,应用金属结构的经典概念并考虑到原子核周围电子密度的高斯型球对称分布,导出了计算金属中一个原子的平均内能和两种不同金属原子相互作用势的普遍公式。对亚稳态Fe50Cu50合金原子相互作用势作计算,得到平衡时fcc-FeCu的晶格常数为0 36433nm与实验测量结果接近,也与H R Gong等人对亚稳态FeCu合金的研究结论一致,证实了亚稳态Fe50Cu50合金是以fcc结构形式存在的固溶体。
基金the support of the“Transformational Technologies for Clean Energy and Demonstration”,Strategic Priority Research Program of the Chinese Academy of Sciences(XDA 21090203)the National Natural Science Foundation of China(22078315,22172169)+2 种基金the Youth Innovation Promotion Association of Chinese Academy of Sciences(2018214,2020189)the Liaoning Revitalization Talents Program(XLYC1907066)the Liaoning Bai Qian Wan Talents Program and DICP(Grant:DICP I202012)。
文摘Catalytic conversion of CO_(2) to high-value products is a crucial method to achieve targets of carbon dioxide emissions peak and carbon neutralization.However,realizing a controllable product distribution in a single CO_(2) hydrogenation process is of great challenge.Herein,we prepared the CuFe nanoalloy catalyst that directly transforms CO_(2) to alkanes using physical sputtering method in mild condition.The characteristic results show that the proximity between Cu and Fe is the crucial factor to tunable products among the different catalysts.The formation of unique coordination of FeCu4 nanoalloys from high-energy sputtering process provides close interaction between Cu and Fe,which is favorable to formation of low carbon paraffin,however,a distant proximity and weak interaction will increase the selectivity of olefins and alcohols.This work provides a general strategy for tuning target chemicals and enriches the viewpoints in CO_(2) hydrogenation.
基金financially supported by the National Natural Science Foundation of China(Nos.52002361 and 22109120)the Science and Technology Research Project of Jiangxi Provincial Education Department(Nos.GJJ2201045 and GJJ2201007)+2 种基金Zhejiang Provincial Natural Science Foundation of China(No.LQ21B030002)the Key Project for Science and Technology Cooperation of Jiangxi Province(No.20212BDH80005)the Project of the Science and Technology of Jingdezhen City(No.20202GYZD013-16)。
文摘Given the clean and inexhaustible solar energy from solar light,photocatalytic ammonia synthesis is extremely appealing.However,high electron-hole recombination rates and insufficient active sites severely limited N2 photoreaction reduction.Herein,we designed and fabricated FeCu alloy nanoparticles anchored on carbon nitride nanosheets with excellent photocatalyt ic ammonia synthesis performance.As a coupler between Fe and carbon nitride,Cu promotes the separation of photogenerated charge carriers in carbon nitride under solar light irradiation,and renters the semiconductor a forceful electron donor for the Fe active sites.The accumulated electrons at Fe sites furtherly facilitated the adsorption and activation of the molecular nitrogen.Besides,the uniform dispersed FeCu alloy nanoparticles were on carbon nitride nanosheets enhanced the stability of photocataly tic nitrogen reduction reaction,making the artificial photocataly tic ammonia synthesis more sustainable for application.This work highlights that a direct electron transfer channel can be used to regulate the photochemical nitrogen fixation network.
文摘The reaction precursors were synthesised by solid state reaction of H 2C 2O 4·2H 2O with NiSO 4·6H 2O and Fe(NO 3) 3·9H 2O,CuSO 4·5H 2O,at room temperature.The brown black nanomater Ni 1.5 FeCu 2.5 O 5.5 with the averages of 60nm was obtained by decomposition of precursors CuC 2O 4·2H 2O,Fe 2(C 2O 4) 3·5H 2O,and NiC 2O 4·2H 2O for about 3 hour at 410℃.The composition,size,appearance and properties of the product was studied by TG,XRD,TEM and SEM.
