Journal
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Volume 37, Issue 6, Pages 1275-1282Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-021-1345-6
Keywords
Direct methanol fuel cell(DMFC); Methanol crossover; Nafion membrane; Graphdiyne
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Funding
- National Natural Science Foundation of China [51802311, U1932211, 21790050, 21790051]
- National Key Research and Development Project of China [2018YFA0703501]
- Key Program of the Chinese Academy of Sciences [QYZDY-SSW-SLH015]
- Foundation of the Youth Innovation Promotion Association of Chinese Academy of Sciences [2019032]
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An ultrathin layer of nitrogen-rich GDY film is prepared to retard methanol permeation in direct methanol fuel cells, significantly increasing selective suppression of methanol transfer and improving power performance and long-term stability of the cell.
The inhibition of the methanol crossover is one of the intractable challenges in the direct methanol fuel cell. The graphdiyne(GDY) with atomic-level pores shows great potential in realizing the zero-permeation of methanol molecules. In this paper, an ultrathin layer of nitrogen-rich GDY film with a high nitrogen content is largely prepared and readily used for retarding the methanol permeation in the state-of-the-art commercial Nafion membrane. The high N-content in this porous GDY nanofilm remarkably increases the selective suppression in methanol transfer, and single-layer GDY film can efficiently prevent 43% methanol crossover and the value of the double-layer GDY film can be high up to 69%. The power performance and the long-term stability of the cell are obviously improved due to the reduced methanol crossover.
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