Biomass seaweed-derived nitrogen self-doped porous carbon anodes for sodium-ion batteries: Insights into the structure and electrochemical activity

Sustainable transformation and efficient utilization of biomasses and their derived materials are environmentally as well as economically compliant strategies. Biomass seaweed-derived nitrogen self-doped porous carbon with tailored surface area and pore structures are prepared through carbonization and activation. The influence of carbonization temperature on morphology, surface area, and heteroatom dopants are investigated to optimize sodium-ion storage capability. Seaweed-derived nitrogen self-doped activated carbon (SAC) as anode materials for sodium-ion batteries exhibits remarkable reversible capacity of 303/192 mAh g(-1) after 100/500 cycles at current densities of 100/200 mA g(-1), respectively, and a good rate capability. The interconnected and porous conducting nature along with the heteroatom dopant role in creating defective sites and charge stabilization are favorable for ion storage and diffusion and electron transport, indicating the electrodes can offer improved electrochemical performances. In addition, post-mortem analysis of the cycled carbon electrodes through ex-situ tools demonstrates the sodium-ion storage mechanism. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Automated summary

The study explores the preparation of seaweed-derived nitrogen self-doped porous carbon materials for improved sodium-ion battery anodes. By optimizing surface area and pore structures through carbonization and activation processes, the electrodes exhibit excellent cycling and rate performance. The interconnected and porous conducting nature of the electrodes, along with heteroatom dopants, play a crucial role in enhancing ion storage and diffusion, resulting in improved electrochemical performances.