Cobalt silicate (Co₂SiO₄, abbreviation as CSO), as one of the sustainable electrode materials, possesses considerable theoretical capacity and excellent structural stability. However, very limited work focuses on hierarchy structure control of CSO although it has an important impact on capacitive capability. In this work, a novel nanobelt-on-nanobelt hierarchy structure of CSO is coupled with reduced graphene oxide (abbreviation as CSO NN/RGO) to realize the remarkable enhancement of their capacitive performance by optimizing electron/ion transportation and decreasing self-aggregation as well as relieving volume expansion during charging and discharging. As it is expected, the capacitance value of CSO NN/RGO can reach 483 F g⁻¹ at 0.5 A g⁻¹ with the 58% capacitance retention after 10000 cycles, which is much higher than those of bulk CSO (217 F g⁻¹), pure CSO nanobelt (244 F g⁻¹) and CSO NN (351 F g⁻¹), clearly demonstrating the significant merit of such a hierarchy NN/RGO structure. Impressively, the hybrid supercapacitor device which is assembled by CSO NN/RGO and activated carbon delivers an excellent performance with a large volume capacitance of 219 mF cm⁻² at 1 mA cm⁻² and a 98% capacitance retention after 6000 cycles.

硅酸钴（Co ₂ SiO ₄，简称CSO），作为可持续的电极材料之一，具有相当大的理论容量和极好的结构稳定性。但是，尽管它对电容性能有重要影响，但是非常有限的工作集中在CSO的层次结构控制上。在这项工作中，一种新颖的CSO纳米带上纳米带结构与还原的氧化石墨烯（缩写为CSO NN / RGO）相结合，通过优化电子/离子传输并减少自聚集来实现其电容性能的显着提高。以及减轻充放电期间的体积膨胀。因为预计，CSO NN / RGO的电容值可达到483 F G ^-1在0.5 A克^-110000次循环后的电容保留率为58％，远远高于散装CSO（217 F g ^-1），纯CSO纳米带（244 F g ^-1）和CSO NN（351 F g ^-1）的明显保留这种层次的NN / RGO结构的显着优点。令人印象深刻的是，由CSO NN / RGO和活性炭组装而成的混合超级电容器器件具有出色的性能，在1 mA cm ^-2时的大容量电容为219 mF cm ^-2，在6000次循环后仍保持98％的电容。