Transition metal-containing halometallate ionic liquids(ILs)-based economical catalysts have been developed for the selective reduction of carbon–carbon multiple bonds with hydrazine hydrate in ethanol under mild rea...Transition metal-containing halometallate ionic liquids(ILs)-based economical catalysts have been developed for the selective reduction of carbon–carbon multiple bonds with hydrazine hydrate in ethanol under mild reaction condition.ILs have been tethered to the surface of mesoporous ZSM-5.The Mn-based halometallate IL tethered to the surface of mesoporous ZSM-5 exhibited the best activity compared to the parent halometallate ILs.It demonstrated efficient recyclability with no appreciable loss in the catalytic activity even after being recycled five times.In order to establish the reaction mechanism,ILs-hydrazine complexes were prepared and investigated in reduction reactions.The structure–activity relationship was established by their catalytic activities,physicochemical characterizations,ILs-hydrazine complex formation,and probe reactions.The catalyst also exhibited excellent activity in the reduction of alkynes to alkanes.This catalytic process demonstrated several key advantages such as mild and convenient reaction condition,low substrate to hydrazine ratio,reusability,and the cost-effectiveness of the catalyst.展开更多
Severe volume changes and poor electrochemical performance are key barriers to the practical use of silicon anodes.In this study,a self-healing,multifunctional supramolecular binder system was introduced,which combine...Severe volume changes and poor electrochemical performance are key barriers to the practical use of silicon anodes.In this study,a self-healing,multifunctional supramolecular binder system was introduced,which combines polymers,ionic liquids,and halometals to achieve dynamic cross linking during volume changes.The addition of specific halometals can adjust the Li+solvation structure and energy,promoting the formation of a stable solid electrolyte interface(SEI)rich in LiF and facilitating Li+desolvation.After 200 cycles,the Si@BF binder(with both ionic liquid and halometal)showed no cracks,indicating excellent structural stability.Additionally,Si||LiFePO_(4)(LFP)full-cell tests at 5 C rate reveal drastic differences:The unmodified binder(the pristine Si)exhibits nearly 0%capacity retention after 400 cycles,the ionic liquid-modified system(Si@B)maintains 11.58%,while Si@BF achieves a remarkable 90.92%retention.Notably,Si@BF retains 78.72%capacity even after 800 cycles.This study offers new insights into dynamic cross-linking systems and solvation-structure regulation,providing references for developing advanced lithium-ion batteries with better performance.展开更多
基金CSIR,New Delhi for funding(01/(2802)/14/EMR-II)。
文摘Transition metal-containing halometallate ionic liquids(ILs)-based economical catalysts have been developed for the selective reduction of carbon–carbon multiple bonds with hydrazine hydrate in ethanol under mild reaction condition.ILs have been tethered to the surface of mesoporous ZSM-5.The Mn-based halometallate IL tethered to the surface of mesoporous ZSM-5 exhibited the best activity compared to the parent halometallate ILs.It demonstrated efficient recyclability with no appreciable loss in the catalytic activity even after being recycled five times.In order to establish the reaction mechanism,ILs-hydrazine complexes were prepared and investigated in reduction reactions.The structure–activity relationship was established by their catalytic activities,physicochemical characterizations,ILs-hydrazine complex formation,and probe reactions.The catalyst also exhibited excellent activity in the reduction of alkynes to alkanes.This catalytic process demonstrated several key advantages such as mild and convenient reaction condition,low substrate to hydrazine ratio,reusability,and the cost-effectiveness of the catalyst.
基金support from the Open Fund of Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies(No.EEST2019-1).
文摘Severe volume changes and poor electrochemical performance are key barriers to the practical use of silicon anodes.In this study,a self-healing,multifunctional supramolecular binder system was introduced,which combines polymers,ionic liquids,and halometals to achieve dynamic cross linking during volume changes.The addition of specific halometals can adjust the Li+solvation structure and energy,promoting the formation of a stable solid electrolyte interface(SEI)rich in LiF and facilitating Li+desolvation.After 200 cycles,the Si@BF binder(with both ionic liquid and halometal)showed no cracks,indicating excellent structural stability.Additionally,Si||LiFePO_(4)(LFP)full-cell tests at 5 C rate reveal drastic differences:The unmodified binder(the pristine Si)exhibits nearly 0%capacity retention after 400 cycles,the ionic liquid-modified system(Si@B)maintains 11.58%,while Si@BF achieves a remarkable 90.92%retention.Notably,Si@BF retains 78.72%capacity even after 800 cycles.This study offers new insights into dynamic cross-linking systems and solvation-structure regulation,providing references for developing advanced lithium-ion batteries with better performance.
