Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) composite was easily synthesized via one-step succinct-operated hydrothermal process.The interconnected Co_(3)V_(2)O_(8)/Co_(3)O_(4) nanowires network can in-situ grow and...Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) composite was easily synthesized via one-step succinct-operated hydrothermal process.The interconnected Co_(3)V_(2)O_(8)/Co_(3)O_(4) nanowires network can in-situ grow and anchor on the surface of Ti_(3)C_(2)T_(x) via the strong Co-F bonds and contribute tremendously to depress Ti_(3)C_(2)T_(x) self-restacking.Profiting from the synergistically interplayed effect among the multiple interfaces and high conductivity of Ti_(3)C_(2)T_(x) as well as outstanding stability of the as-designed nanostructure,the optimum Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x)electrode reaches a commendable specific capacitance(up to 3800 mF·cm^(−2)),great rate capability(80%capacitance retention after 20-times current increasing),and preeminent cycling stability(95.4%/85.5%retention at 7000th/20,000th cycle).Moreover,the all-solid-state asymmetric supercapacitor based on Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) and active carbon can deliver a high energy density of 84.0μWh·cm^(−2) at the power energy of 3.2 mW·cm^(−2),and excellent cycling durability with 87.0%of initial capacitance retention upon 20,000 loops.This work provides a practicable pathway to tailor MXene-based composites for high-performance supercapacitor.展开更多
Hollow NiCoSe_(x)(H-NiCoSe_(x)) nanospheres encapsulated with carbon shell were prepared via one-step easy solvothermal method followed by the carbon coating process.H-NiCoSe_(x)@C has large interior void with the uni...Hollow NiCoSe_(x)(H-NiCoSe_(x)) nanospheres encapsulated with carbon shell were prepared via one-step easy solvothermal method followed by the carbon coating process.H-NiCoSe_(x)@C has large interior void with the uniform dimension around 350 nm and the thickness of carbon shell around 20-30 nm.Coupling with the large interior void as well as robust protective carbon shell,H-NiCoSe_(x)@C can retain the reversible capacity of 805.6 mAh·g^(-1) after 100 cycles at 200 mA·g^(-1).In particular,H-NiCoSe_(x)@C delivers large reversible capacity of 1532.2 mAh·g^(-1) upon cycling for 1000 loops at 1000 mA·g^(-1)with the capacity retention as high as 128.2% upon long period of activation.Even at the high rate of 3000 mA·g^(-1),its specific capacity still retains up to 659.3 mAh·g^(-1).The superior lithium storage performances for H-NiCoSe_(x)@C profit from its robust hollow core-shell structure as well as enhanced electrical conductivity and ion transport.展开更多
We present a simple and straightforward protocol for hydrochlorination of terminal arylalkynes to vinyl chlorides using hydrogen chloride under mild reaction conditions. This protocol does not involve any metal cataly...We present a simple and straightforward protocol for hydrochlorination of terminal arylalkynes to vinyl chlorides using hydrogen chloride under mild reaction conditions. This protocol does not involve any metal catalysts or additives. It is simple, inexpensive, and easy to prepare, and exhibits good reaction activity. The hydrochlorination proceeds smoothly to yield unique regioselective products via the Markovnikov addition rule.展开更多
基金supported by the National Natural Science Foundation of China(No.51772133)the Taishan Scholar Project of Shandong Province,China(ZR2017JL022)+1 种基金the Project of“20 Items of University”of Jinan,China(No.2018GXRC001)Case-by-Case Project for Top Outstanding Talents of Jinan,China。
基金This study was financially supported by the National Science Foundation of China(No.52201254)the National Science Foundation of Shandong Province(Nos.ZR2020MB090 and ZR2020QE012)+1 种基金the Project of“20 Items of University”of Jinan(No.202228046)Taishan Scholar Project of Shandong Province.
文摘Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) composite was easily synthesized via one-step succinct-operated hydrothermal process.The interconnected Co_(3)V_(2)O_(8)/Co_(3)O_(4) nanowires network can in-situ grow and anchor on the surface of Ti_(3)C_(2)T_(x) via the strong Co-F bonds and contribute tremendously to depress Ti_(3)C_(2)T_(x) self-restacking.Profiting from the synergistically interplayed effect among the multiple interfaces and high conductivity of Ti_(3)C_(2)T_(x) as well as outstanding stability of the as-designed nanostructure,the optimum Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x)electrode reaches a commendable specific capacitance(up to 3800 mF·cm^(−2)),great rate capability(80%capacitance retention after 20-times current increasing),and preeminent cycling stability(95.4%/85.5%retention at 7000th/20,000th cycle).Moreover,the all-solid-state asymmetric supercapacitor based on Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) and active carbon can deliver a high energy density of 84.0μWh·cm^(−2) at the power energy of 3.2 mW·cm^(−2),and excellent cycling durability with 87.0%of initial capacitance retention upon 20,000 loops.This work provides a practicable pathway to tailor MXene-based composites for high-performance supercapacitor.
基金financially supported by the National Natural Science Foundation of China(No.51772133)the Natural Science Foundation of Shandong Province(No.ZR2017JL022)+1 种基金the Project of“20 Items of University”of Jinan(No.2018GXRC001)the Case-by-Case Project for Top Outstanding Talents of Jinan。
文摘Hollow NiCoSe_(x)(H-NiCoSe_(x)) nanospheres encapsulated with carbon shell were prepared via one-step easy solvothermal method followed by the carbon coating process.H-NiCoSe_(x)@C has large interior void with the uniform dimension around 350 nm and the thickness of carbon shell around 20-30 nm.Coupling with the large interior void as well as robust protective carbon shell,H-NiCoSe_(x)@C can retain the reversible capacity of 805.6 mAh·g^(-1) after 100 cycles at 200 mA·g^(-1).In particular,H-NiCoSe_(x)@C delivers large reversible capacity of 1532.2 mAh·g^(-1) upon cycling for 1000 loops at 1000 mA·g^(-1)with the capacity retention as high as 128.2% upon long period of activation.Even at the high rate of 3000 mA·g^(-1),its specific capacity still retains up to 659.3 mAh·g^(-1).The superior lithium storage performances for H-NiCoSe_(x)@C profit from its robust hollow core-shell structure as well as enhanced electrical conductivity and ion transport.
基金financial support from the National Basic Research Program of China(973 Program,No.2012CB720300)the Applied Basic Research Program of Bingtuan(No.2015AG001)the High-level Talent Scientific Research Project of Shihezi University(No.RCZX201405)
文摘We present a simple and straightforward protocol for hydrochlorination of terminal arylalkynes to vinyl chlorides using hydrogen chloride under mild reaction conditions. This protocol does not involve any metal catalysts or additives. It is simple, inexpensive, and easy to prepare, and exhibits good reaction activity. The hydrochlorination proceeds smoothly to yield unique regioselective products via the Markovnikov addition rule.
