51. The strain induced synergistic catalysis of FeN4 and MnN3 dual-site catalysts for oxygen reduction in proton- /anion- exchange membrane fuel cells.
- Author
-
Huang, Shiqing, Qiao, Zelong, Sun, Panpan, Qiao, Kangwei, Pei, Kun, Yang, Liu, Xu, Haoxiang, Wang, Shitao, Huang, Yan, Yan, Yushan, and Cao, Dapeng
- Subjects
- *
FUEL cells , *PROTON exchange membrane fuel cells , *CATALYSIS , *CATALYSTS , *OXYGEN reduction , *ELECTRON configuration , *CATALYST structure , *ELECTRONIC structure - Abstract
The Fe-N-C single-atom catalysts (SACs) have been widely explored for oxygen reduction reaction (ORR) in fuel cells. However, how to improve the ORR activity by tailoring the electronic structure of Fe-N-C catalysts is challenging. Herein, we synthesize a Fe-Mn-N-C dual-atom catalyst (DAC) with new local structure of FeN 4 -MnN 3 moiety, and it exhibits ultralow H 2 O 2 yield and better ORR performance than Fe-N-C and Mn-N-C SACs. Importantly, the Fe-Mn-N-C-based proton-/anion- exchange membrane fuel cells present ultrahigh power densities of 1.048 W cm−2 and 1.321 W cm−2, respectively. DFT results reveal that the strain yielded by the formation of Mn-Fe bond significantly optimizes the electronic structure of the Fe-Mn-N-C, and the co-adsorption of the Fe-Mn dual-sites for *OOH not only almost completely suppresses the 2e- ORR, but also breaks the linear correlation between G OH* and G OOH* proposed by Norskov et al., which provides a new route for the design of dual- site catalysts. [Display omitted] • Fe-Mn-N-C dual-site catalyst with FeN 4 -MnN 3 moiety exhibits ultrahigh ORR activity in acidic and alkaline media. • Fe-Mn-N-C-based PEMFC and AEMFC present ultrahigh peak power densities of 1.048 W cm−2 and 1.321 W cm−2. • DFT results reveal that the Mn-Fe bond induced strain efficiently optimizes the electronic structure of the Fe-Mn-N-C. • The co-adsorption of Fe-Mn dual-sites for *OOH almost suppresses 2e- ORR, which provides a new strategy to design catalysts. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF