Converting rice husks into valuable chemicals or advanced materials has attracted significant interests of economic and environmental benefits. In this study, we prepared rice husk-derived porous carbon sheets (PCS) by sustainable and recyclable salt activation. The employed NaCl/KCl salt mixture was not only the template agent for mesopores, but also necessary for the formation of 2D carbon structure. The evolution of porosity and carbon morphology after activation was systematically investigated. The optimal product 4PCS-800-2 owned a high surface area and numerous open micro-/mesopores arraying on planar carbon sheet. Benefiting from these features, 4PCS-800-2 exhibited high specific capacitance (288 F g⁻¹ at 0.5 A g^-1), efficient pore utilization, excellent rate capability and cyclic stability as electrode material. It was noting that rice husks were also continuously converted into xylose and lignin/silica nano-spheres in prior to the synthesis of PCSs. Hence a comprehensive utilization of rice husk was realized and the whole components had been converted into valuable products.

将稻壳转化为有价值的化学品或先进材料已经引起了巨大的经济和环境效益。在这项研究中，我们通过可持续和可回收的盐活化制备了稻壳衍生的多孔碳片（PCS）。所采用的NaCl/KCl盐混合物不仅是介孔的模板剂，而且是形成二维碳结构所必需的。系统地研究了活化后孔隙率和碳形态的演变。最佳产品4PCS-800-2具有高表面积和许多开放的微孔/介孔排列在平面碳片上。得益于这些特性，4PCS-800-2 表现出高比电容（288 F g ^-1在 0.5 A g ^-1)、高效的孔利用率、优异的倍率性能和作为电极材料的循环稳定性。值得注意的是，在合成 PCS 之前，稻壳也被连续转化为木糖和木质素/二氧化硅纳米球。从而实现了稻壳的综合利用，并将其全部成分转化为有价值的产品。