Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 13, Pages 11108-11115Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17264
Keywords
biomass; in-suit activation; hierarchically porous structure; carbon; microwave absorption
Funding
- National Natural Science Foundation of China [51373143, 21674087]
- Natural Science Foundation of Fujian Province [2014J07002]
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A variety of biomass-based carbon materials with two-level porous structure have been successfully prepared by one-step carbonization process. The first level of microscale pores templates from the inherent porous tissues, while the second one of nanopores is produced by the in situ etching by the embedded alkaline metal elements. The superimposed effect of nano and microscale pores endows the hierarchically porous carbons (HPCs) with excellent microwave absorption (MA) performance. Among them, the spinach-derived HPC exhibits a maximum reflection loss of -62.2 dB and a broad effective absorption bandwidth of 7.3 GHz. Particularly, this excellent MA performance can be reproduced using the biomass materials belonging to different families, harvested seasons, and origins, indicating a green and sustainable process. These encouraging findings shed the insights on the preparation of biomass-derived microwave absorbents with promising practical applications.
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