A comprehensive green utilization strategy of lignocellulose from rice husk for the fabrication of high-rate electrochemical zinc ion capacitors

• DOI: 10.1016/j.jclepro.2021.129522
• Publication Date: 2021-10-29T03:25:32Z
• Authors: Wenli Zhang; Wenbin Jian; Jian Yin; Xiaoshan Zhang; Caiwei Wang; Xuliang Lin; Yanlin Qin; Ke Lu; Haibo Lin; Tiejun Wang; Xueqing Qiu
• Keywords: 7. Clean energy; 01 natural sciences; 12. Responsible consumption; 0104 chemical sciences

Abstract Rice husk is an important biomass residue derived from the production of rice. Rice husk contains silica (10–20 wt%) and lignocellulose (cellulose, 15–25 wt%; lignin, 10–20 wt%). The lignocellulose components in rice husk are potential carbon sources for functional carbon materials. In this work, we propose a general comprehensive green utilization strategy for the preparation of lignin-derived hierarchical porous carbon (LHPC) and cellulose-paper-based separator using the lignin and cellulose components inside rice husk, respectively. The obtained LHPC and cellulose paper separators were used as pivotal components for the fabrication of high-rate electrochemical zinc ion capacitors. Meanwhile, the silica and potassium sources in this comprehensive route were recycled as nano-sized SiO2 particles and pure KCl powders. This work constitutes a general route for the green utilization of rice husk biomass. This work opens a green avenue for the effective utilization of renewable biomasses to develop functional carbon materials and pivotal components of electrochemical energy storage devices.