期刊
JOURNAL OF POWER SOURCES
卷 287, 期 -, 页码 431-438出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.04.094
关键词
Fe-embedded BN sheet; Oxygen reduction reaction; Non-noble catalyst; Density functional theory
资金
- National Nature Science Foundation of China [21203048]
- Scientific Research Fund of Heilongjiang Provincial Education Department [12531195]
- Excellent Young Foundation of Harbin Normal University [XKYQ201304]
We performed comprehensive density functional theory (DFT) calculations to explore the possibility of the Fe-embedded hexagonal boron nitride (h-BN) sheet as a novel electrocatalyst for ORR. Our results show that Fe atom can strongly bind with defective BN sheet and thus ensure its high stability. Moreover, O-2 molecule is found to be strongly chemisorbed on Fe-embedded BN sheet with the adsorption energy of -1.76 eV, which can server as precursors for ORR, followed by its hydrogenation into OOH species rather than direct breakage of the O-O bond. Further, the HOOH species in the process of OOH reduction is shown to be unstable and dissociates into two OH group, suggesting that ORR catalyzed by Fe-embedded BN sheet is a direct four-electron pathway. Finally, on the basis of the calculations on the free energy change and activate energy of each step in ORR, we expect that Fe-embedded BN sheet exhibits good catalytic activity for ORR. Our results provide an useful guidance for the design and fabrication of novel and nonprecious BN sheet-based electrocatalyst for ORR as the alternative of expensive Pt catalysts. (C) 2015 Elsevier B.V. All rights reserved.
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