Lignocellulose is an ideal precursor for supercapacitor electrodes due to its diverse structures and abundant availability. For supercapacitors, particularly electric double-layer capacitors (EDLCs), pore structure is critical. This review summarizes advances in lignocellulose-derived hierarchical porous carbon (LHPC) for supercapacitors, focusing on pore structure and future research directions. We discuss how pore structure influences supercapacitor performance, the activation methods for creating pores in LHPC, and review studies on optimizing pore structure for high-performance supercapacitors. Hierarchical porous carbon should feature a sufficient micropore surface area along with suitable mesoporous and macroporous surfaces to enhance rate performance while maintaining capacitance. This review is expected to actively advance the selection of lignocellulosic precursors and the development of optimized pore structure models, with the ultimate goal of enabling efficient production of lignocellulose-derived hierarchical porous carbon electrodes with superior properties.

LTA (Na-A) zeolite has regular three-dimensional pore structure, high specific surface area and large pore volume,and high water-adsorption efficiency. Therefore, it is widely used in deep dehumidification in industry. Despite that, the regeneration temperature of LTA molecular sieve is normally higher than 200 ℃. As a consequence, reducing the desorption temperature of LTA molecular sieve is one of the major focuses for its functional optimization. LTA (Na-A) zeolites with mesopore-micropore hierarchical structure were prepared by using a step-by-step hydrothermal method. In addition, the effects of hydrothermal temperature on performance of the hierarchical porous zeolite were evaluated. It is found that, at hydrothermal temperature of 100 ℃, the synthesized LTA zeolites display promising crystallinity and stability. The water-adsorption capacity could reach 0.304 g·g^-1 at 30 ℃. Meanwhile, TGA result indicates that desorption efficiency of the LTA zeolites is significantly improved, with 81% of the adsorbed water molecules than can be removed at 200 ℃, contrasting to 67% for the conventional Na-A zeolite.