Based on the considerations in environmental and economic benefits, Cr₂O₇^2- as the major chromium pollutant is employed for applications in energy storage. A novel Cr₂O₃ ultrasmall nanoparticles (NPs) (<5nm) filled carbon nanocapsule configuration is achieved through a surfactant-free solvothermal route with renewable furfural as the carbon source. The confinement effect that Cr₂O₃ NPs are restrained in the outer robust carbon shell and the plenty space among Cr₂O₃ NPs result in substantially enhanced Li-storage performances, such as stable capacity of 568 mAh g^-1 at 100 mA g^-1 after more than 200 cycles and high capacity retention at large current density.

基于对环境和经济利益的考虑，作为主要铬污染物的Cr ₂ O ₇ ^2-被用于储能。通过使用可再生糠醛作为碳源的无表面活性剂溶剂热途径，获得了一种新型的Cr ₂ O ₃超小纳米颗粒（NPs）（<5nm）填充的碳纳米胶囊结构。的限制效应的Cr ₂ ö ₃纳米颗粒在所述外健壮碳壳和Cr之间的充足的空间抑制_2个ö ₃纳米颗粒导致显着增强的锂存储性能，如568毫安克稳定容量^-1在100mA克^-1 经过200个以上的循环，并在大电流密度下保持高容量。