蜂巢
材料科学
化学工程
阳离子聚合
碳纤维
纳米纤维素
对偶(语法数字)
固态
多孔性
电池(电)
蜂窝结构
复合材料
化学
高分子化学
纤维素
复合数
艺术
功率(物理)
物理
物理化学
量子力学
工程类
文学类
作者
Chenglong Qiu,Lei Zhang,Baobin Wang,Guihua Yang,Lucian A. Lucia,Fengfeng Li,Jiachuan Chen
标识
DOI:10.1016/j.indcrop.2022.115242
摘要
Conversion of low-value biomass to hierarchically porous carbon-based materials for oxygen reduction reactions (ORR), without using conventional template methods, is of particular significant for energy storage technology. Herein, dual honeycomb-like porous carbon inspired by multiscale structure of wood was assembled with cationic nanocellulose film into Zn-air battery. Nitrogen-doped hierarchically porous carbon was obtained by a simple two-step process involving alkaline extraction and pyrolysis with NH 4 Cl. Alkaline extraction was utilized for partially degrading lignin and heterosaccharide from unprocessed wood to create a porous wood with numerous nanopores and 3D loose structure. The inner and outer parts of obtained porous wood were further pore-optimized and doped with NH 4 Cl by a consequent pyrolysis step. The resulting carbon-based material (AHWC) possessed high specific surface area (1601.8 m 2 g −1 ), well-developed hierarchical porosity, and high N content enabled excellent electrocatalytic oxygen reduction performance. Compared with commercial Pt/C catalysts in KOH electrolyte, AHWC exhibits nearly two times higher kinetic currents in the low overpotential region, comparable number of transferred electrons, and significantly higher operating stability. This carbon-based material also showed an excellent capacity and energy density equal to 792 mA h g −1 and 927 W h kg −1 , together with superior long-term durability (200 h at the current density of 10 mA cm −2 ) when assembled as the active electrode material into a Zn-air battery. Additionally, cationic modified nanocellulose film (C-CNF-M), acting as a solid electrolyte, was assembled with AHWC for a quasi-solid-state Zn-air battery which exhibited excellent specific capacity (672.2 mA h g −1 ), energy density (644.11 W h kg −1 ) and cycling stability (500 min at 1 mA cm −2 ). The AHWC establish a bridge between papermaking and the field of energy storage by green conversion of biomass and fabrication of porous carbon-based materials and cellulose based electrolyte with excellent properties applicable to electrochemical energy devices. • Dual honeycomb-like hierarchically porous carbon (AHWC) has been obtained. • The honeycomb-like structure of pores on the multichannel walls can be controlled. • Abundant defects and interconnect pores in carbon lead to excellent ORR activity. • Cationic modified nanofibers (C-CNF) was prepared as a solid electrolyte. • The Zn-air battery with AHWC showed an excellent cycling stability.
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