Iron-based anodes for lithium-ion batteries(LIBs)with higher theoretical capacity,natural abundance and cheapness have received considerable attention,but they still suffer from the fast capacity fading.To address thi...Iron-based anodes for lithium-ion batteries(LIBs)with higher theoretical capacity,natural abundance and cheapness have received considerable attention,but they still suffer from the fast capacity fading.To address this issue,we report a facile synthesis of plate-like carbonsupported Fe_(3)C nanoparticles through chemical blowing/carbonization under calcination.The ultrafine Fe_(3)C nanoparticles are prone to be oxidized when exposing in air;thus,Fe_(3)C/C with mild oxidization and the fully oxidized product of Fe_(2)O_(3)/C are successfully prepared by controlling the oxidization condition.When applied as an anode material in LIB,the Fe_(3)C/C electrode demonstrates excellent cycle stability(826 mAh·g^(-1)after 120 cycles under 500 mA·g^(-1))and rate performance(410.6 mAh·g^(-1) under 2 A·g^(-1)),compared with the Fe_(2)O_(3)/C counterpart.The enhanced electrochemical performance can be ascribed to the synergetic effect of the Fe_(3)C with mild oxidation and the unique hierarchical structure of plate-like carbon decorated with Fe_(3)C catalyst.More importantly,this work may offer new approaches to synthesize other transition metal(e.g.,Co,Ni)-based anode material by replacing the precursor ingredient.展开更多
Propane dehydrogenation using CO_(2)as a mild oxidizer(CO_(2)-ODP)is a promising technology for high propylene production and CO_(2)reduction utilization.Among them,the reverse water gas shift reaction(RWGS)can change...Propane dehydrogenation using CO_(2)as a mild oxidizer(CO_(2)-ODP)is a promising technology for high propylene production and CO_(2)reduction utilization.Among them,the reverse water gas shift reaction(RWGS)can change the reaction equilibrium to increase the propylene yield,and the Boudouard reaction can assist in the carbon accumulation elimination.However,the efficiency of the catalysts developed so far is limited,we introduced the Cr active component during the synthesis of porous silica spheres to form a CO_(2)-ODP catalyst,with a uniform distribution of active sites via(NH_(4))_(3)[CrMo_(6)O_(24)H_(6)]·7H_(2)O produce a derivative.As anα-type Anderson series of polyoxometalates(POMs),this six octahedral structure formed by Mo participation surrounds the central atom Cr,which is more stable in structure by electrostatic effect,its derivatives generated after calcination are stably bound to the silica-based carrier,which reduces the formation of inertα-Cr_(2)O_(3)by CrO_(x)aggregation during the catalytic process.Meanwhile,the oxygen atoms rich in polyoxometalates are more likely to form Si-O bonds with the carrier,which makes the active sites evenly and stably branched in the inner wall of the pores of mesoporous silica spheres,reduces the influence of carbon accumulation,and facilitates the activation and regeneration.The CO_(2)conversion of the catalyst CrMoO_(x)@mesoporous silica spheres(MSS)is typically greater than 20%under selected ideal conditions.This synthesis method of assembling POMs with mesoporous materials opens a new pathway for developing propane dehydrogenation catalysts.Compared to traditional impregnation synthesis,this catalyst contains a lower Cr content while achieving higher CO_(2)consumption efficiency.展开更多
1 Results Carbonyl compounds constitute an important group of molecules in organic chemistry,which appears in pharmaceuticals,dyes and industrially important chemicals[1-2].The oxidation of alcohols to the correspondi...1 Results Carbonyl compounds constitute an important group of molecules in organic chemistry,which appears in pharmaceuticals,dyes and industrially important chemicals[1-2].The oxidation of alcohols to the corresponding carbonyl groups is a fundamental transformation in organic chemistry and industrially important[3].There is considerable interest in the use of room temperature ionic liquids as promising substitutes for volatile organic solvents.The ambient-temperature ionic liquids,especially those bas...展开更多
基金financially supported by State Grid Corporation of China(No.5202011600TY)。
文摘Iron-based anodes for lithium-ion batteries(LIBs)with higher theoretical capacity,natural abundance and cheapness have received considerable attention,but they still suffer from the fast capacity fading.To address this issue,we report a facile synthesis of plate-like carbonsupported Fe_(3)C nanoparticles through chemical blowing/carbonization under calcination.The ultrafine Fe_(3)C nanoparticles are prone to be oxidized when exposing in air;thus,Fe_(3)C/C with mild oxidization and the fully oxidized product of Fe_(2)O_(3)/C are successfully prepared by controlling the oxidization condition.When applied as an anode material in LIB,the Fe_(3)C/C electrode demonstrates excellent cycle stability(826 mAh·g^(-1)after 120 cycles under 500 mA·g^(-1))and rate performance(410.6 mAh·g^(-1) under 2 A·g^(-1)),compared with the Fe_(2)O_(3)/C counterpart.The enhanced electrochemical performance can be ascribed to the synergetic effect of the Fe_(3)C with mild oxidation and the unique hierarchical structure of plate-like carbon decorated with Fe_(3)C catalyst.More importantly,this work may offer new approaches to synthesize other transition metal(e.g.,Co,Ni)-based anode material by replacing the precursor ingredient.
基金financial support by“Grassland Talents”of Inner Mongolia Autonomous Region,Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region(No.NJYT23030)Technology Breakthrough Engineering Hydrogen Energy Field"Unveiling and Leading"Project(No.2024KJTW0018)+4 种基金“Steed plan High level Talents”of Inner Mongolia University,Carbon neutralization research project(No.STZX202218)the National Natural Science Foundation of China(No.U22A20107)Inner Mongolia Autonomous Region Natural Science Foundation(No.2023MS02002)Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion(No.MATEC2024KF011)National Key R&D Program of China(No.2022YFA1205201).
文摘Propane dehydrogenation using CO_(2)as a mild oxidizer(CO_(2)-ODP)is a promising technology for high propylene production and CO_(2)reduction utilization.Among them,the reverse water gas shift reaction(RWGS)can change the reaction equilibrium to increase the propylene yield,and the Boudouard reaction can assist in the carbon accumulation elimination.However,the efficiency of the catalysts developed so far is limited,we introduced the Cr active component during the synthesis of porous silica spheres to form a CO_(2)-ODP catalyst,with a uniform distribution of active sites via(NH_(4))_(3)[CrMo_(6)O_(24)H_(6)]·7H_(2)O produce a derivative.As anα-type Anderson series of polyoxometalates(POMs),this six octahedral structure formed by Mo participation surrounds the central atom Cr,which is more stable in structure by electrostatic effect,its derivatives generated after calcination are stably bound to the silica-based carrier,which reduces the formation of inertα-Cr_(2)O_(3)by CrO_(x)aggregation during the catalytic process.Meanwhile,the oxygen atoms rich in polyoxometalates are more likely to form Si-O bonds with the carrier,which makes the active sites evenly and stably branched in the inner wall of the pores of mesoporous silica spheres,reduces the influence of carbon accumulation,and facilitates the activation and regeneration.The CO_(2)conversion of the catalyst CrMoO_(x)@mesoporous silica spheres(MSS)is typically greater than 20%under selected ideal conditions.This synthesis method of assembling POMs with mesoporous materials opens a new pathway for developing propane dehydrogenation catalysts.Compared to traditional impregnation synthesis,this catalyst contains a lower Cr content while achieving higher CO_(2)consumption efficiency.
文摘1 Results Carbonyl compounds constitute an important group of molecules in organic chemistry,which appears in pharmaceuticals,dyes and industrially important chemicals[1-2].The oxidation of alcohols to the corresponding carbonyl groups is a fundamental transformation in organic chemistry and industrially important[3].There is considerable interest in the use of room temperature ionic liquids as promising substitutes for volatile organic solvents.The ambient-temperature ionic liquids,especially those bas...
