期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 59, 期 49, 页码 21371-21382出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c03771
关键词
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资金
- Ministry of Research and Technology of Indonesia through Fundamental Research grants [1108/PKS/ITS/2020]
- Ministry of Research, Technology and Higher Education of Indonesia through the PMDSU program
In this paper, a new method using an ammonia-urea system was proposed to prepare cellulose aerogels from coir fibers as the starting material for non-ordered porous nitrogendoped carbon aerogels. Direct pyrolysis of the as-prepared carbon aerogels has successfully produced nitrogen-doped carbon aerogels using the cellulose aerogel derived from the nitrogen-rich coir fibers. The as-prepared carbon aerogel inherits the three-dimensional nonordered porous network of the cellulose aerogel, maintaining its high specific surface area (SSA) and the large pore volume. In addition, the honeycomb-like structure of internal pores in individual fibers could also be maintained, and the pores are even larger than those of the corresponding cellulose aerogel. In the ammonia-urea system, ammonia not only served as an agent to assist the cellulose dissolution but also played an important role in exfoliating the carbon aerogel to form defects that cause a few layer disorders. The defects caused the SSA and the pore volume of the aerogel to increase significantly after carbonization. The surface area increased from approximately 70 to 3730 m(2)/g and the pore volume from 0.54 to 4.20 cm(3)/g. The porous nitrogendoped carbon aerogel showed excellent electrocatalytic activity toward the oxygen reduction reaction (ORR) in alkaline media following a two-electron-transfer mechanism.
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