3 years ago

Zn Single Atom Catalyst for Highly Efficient Oxygen Reduction Reaction

Zn Single Atom Catalyst for Highly Efficient Oxygen Reduction Reaction
Lin Gu, Ping Song, Zheng Jiang, Weilin Xu, Mi Luo, Wei Xing, Xiaozhi Liu
The authors report first a new type of nitrogen-triggered Zn single atom catalyst, demonstrating high catalytic activity and remarkable durability for the oxygen reduction reaction process. Both X-ray absorption fine structure spectra and theoretical calculations suggest that the atomically dispersed Zn-N4 site is the main, as well as the most active, component with O adsorption as the rate-limiting step at a low overpotential of 1.70 V. This work opens a new field for the exploration of high-performance Pt-free electrochemical oxygen reduction catalysts for fuel cells. The new nitrogen-triggered Zn single-atom catalyst shows high catalytic activity for the oxygen reduction reaction (ORR) process. The characterization and theoretical calculations suggest that the main active site is the dispersed Zn-N4 moiety, with O adsorption as the rate-limiting step at a low overpotential of 1.70 V. The single-atom ZnNx/C catalyst is one of the most promising Pt alternatives for the ORR process.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201700802

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