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Effect of the Charge State on the Catalytic Activity of a Fullerene-Based Molecular Electrocatalyst: A Theoretical
Hengyu Xiao1, Huirong Li1, Xiyu Li1
1Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, Hefei Science Center of CAS, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
Abstract:
The charge state of a catalyst is significant for its catalytic activity. In this work, taking molecular electrocatalysts of fullerene C60 with a doped transition metal (TM-C60, where TM = Fe, Co, or Ni) as an example, we conducted first-principles calculations to study the effect of the charge state on the cathodic nitrogen reduction reaction (NRR) and anodic oxygen evolution reaction (OER). Our calculated results suggest that the maximal free energy barrier of the NRR with a dissociative mechanism is a nearly linear function of the number of negatively charged electrons (0-3). Nevertheless, the NRR activity with an associative mechanism is insensitive to the charge state effect. The OER activity of TM-C60 with a 0-3 e+ charge state exhibits a volcano-shaped trend, which indicates that it is important to tailor a particular charge state toward effective catalytic activity. This study provides new insight into the effect of the charge state on catalytic activity, which could help us improve our understanding of the catalytic mechanism and tailor a new efficient catalyst.
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