多界面耦合空心核壳MnCoSe_(x)/MnO@氮掺杂碳复合材料的制备及电化学性能

Preparation of hollow core-shelled MnCoSe_(x)/MnO@nitrogen-doped carbon composite by multiple interfaces coupling and its electrochemical properties

通过简单的溶剂热和硒化策略以及进一步的碳层包覆程序制备氮掺杂碳壳包裹的空心MnCoSe_(x)/MnO纳米球(MnCoSe_(x)/MnO@N-C)。得益于MnCoSe_(x)和MnO之间的多界面耦合以及独特的空心核壳结构,MnCoSe_(x)/MnO@N-C复合材料具有较高的比电容和优异的倍率性能,即使在5 A/g的高电流密度下,MnCoSe_(x)/MnO@N-C仍可以稳定运行20000次循环,并保持84.6%的初始比电容。由MnCoSe_(x)/MnO@N-C和活性炭组装的非对称超级电容器器件在功率密度为810 W/kg时表现出11.2 W·h/kg的高能量密度,并拥有超长的循环寿命,在20000次循环后仍可保留初始比电容的84.0%。

Hollow MnCoSe_(x)/MnO nanospheres wrapped with nitrogen-doped carbon shell(MnCoSe_(x)/MnO@N-C)were prepared via a simple solvothermal and selenization strategy followed by the carbon coating procedure.Benefitting from the multiple interfaces coupling between MnCoSe_(x) and MnO and unique hollow core-shell architecture,MnCoSe_(x)/MnO@N-C composites possess high specific capacitance and superior rate capability,even at a high current density of 5 A/g,the MnCoSe_(x)/MnO@N-C can operate steadily for 20000 cycles with 84.6%of initial specific capacitance maintained.An asymmetric supercapacitor device assembled by MnCoSe_(x)/MnO@N-C and active carbon depicts a high energy density of 11.2 W·h/kg at a power density of 810 W/kg and a long cycle life with 84.0%of the initial specific capacitance retained after 20000 cycles.