Hollow core-shell structure nanomaterials have been broadly used in energy storage

catalysis

reactor

and other fields due to their unique characteristics

including the synergy between different materials

a large specific surface area

small density

large charge carrying capacity and so on. However

their synthesis processes were mostly complicated

and few researches reported one-step encapsulation of different valence states of precious metals in carbon-based materials. Hence

a novel hollow core-shell nanostructure electrode material

RuO

2

@Ru/HCs

with a lower mass of ruthenium to reduce costs was constructed by one-step hydrothermal method with hard template and co-assembled strategy

consisting of RuO

2

core and ruthenium nanoparticles (Ru NPs) in carbon shell. The Ru NPs were uniformly assembled in the carbon layer

which not only improved the electronic conductivity but also provided more active centers to enhance the pseudocapacitance. The RuO

2

core further enhanced the material's energy storage capacity. Excellent capacitance storage (318.5 F·g

-1

at 0.5 A·g

-1

)

rate performance (64.4%) from 0.5 A·g

-1

to 20 A·g

-1

and cycling stability (92.3% retention after 5000 cycles) were obtained by adjusting Ru loading to 0.92% (mass). It could be attributed to the wider pore size distribution in the micropores which increased the transfer of electrons and protons. The symmetrical supercapacitor device based on RuO

2

@Ru/HCs could successfully light up the LED lamp. Therefore

our work verified that interfacial modification of RuO

2

and carbon could bring attractive insights into energy density for next-generation supercapacitors.