Biomass is treated as the most promising carbon source for supercapacitor electrodes. However, ash in biomass especially Si component is always identified as an adverse substance, which is moved by acid pickling in advance. Factually, SiO₂ in biomass can be converted into transition metal silicate (TMS). In this work, NaH₂PO₂ and Co(NO₃)₂ are newly used in sequence to form mesopores and micropores on the rice husks which can be regarded as one carbon-silicon compound material. SiO₂ in rice husks is converted to TMSs reacting with Co(NO₃)₂, and carbon is catalyzed to graphitize by the Co element. The remaining CoO derived from Co(NO₃)₂ forms a heterostructure with Co₂SiO₄. The pore design criteria for electrode materials with redox reactions are proposed based on COMSOL simulation results, which include mesopores playing a decisive role in ion diffusion, the pore size should be gradually reduced, and the specific capacitance is significantly increased when the porosity is greater than 0.8. The electrode material prepared that Co₂SiO₄/CoO is anchored on carbon with hierarchical pores has outstanding performance: 246.60 F·g⁻¹ at 0.5 A·g⁻¹ for specific capacitance and good cycle capability (88.06% after 10,000 cycles). For the mr10-500-C/CoSi/CoO-900//AC device, it has excellent energy density (37.500 Wh·kg⁻¹ at 1350 W·kg⁻¹).

生物质被视为超级电容器电极最有前途的碳源。然而，生物质中的灰分，尤其是Si成分，总是被认定为有害物质，并通过酸洗提前去除。事实上，生物质中的SiO ₂可以转化为过渡金属硅酸盐(TMS)。本工作首次采用NaH ₂ PO ₂和Co(NO ₃ ) ₂依次在稻壳上形成介孔和微孔，可视为一种碳硅复合材料。稻壳中的SiO _{2与Co(NO 3} ) ₂反应转化为TMS ，并且碳被Co元素催化石墨化。剩余的 CoO 衍生自 Co(NO₃ ) _{2与Co 2} SiO ₄形成异质结构。基于COMSOL模拟结果提出了发生氧化还原反应的电极材料的孔隙设计准则，其中介孔对离子扩散起决定性作用，孔径应逐渐减小，当孔隙率大于0.8。_{所制备的Co 2} SiO ₄ /CoO锚定在分级孔碳上的电极材料具有优异的性能：246.60 F·g ^-1 at 0.5 A·g ^-1具有比电容和良好的循环能力（10,000 次循环后为 88.06%）。对于mr10-500-C/CoSi/CoO-900//AC器件，其具有优异的能量密度（1350 W·kg ^-1时为37.500 Wh·kg ^-1）。