N-Doped Graphene-Supported Diatomic Ni-Fe Catalyst for Synergistic Oxidation of CO

Qian Wang, Benjin Jin, Min Hu, Chuanyi Jia*, Xin Li*, Edward Sharman, Jun Jiang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Polynary single-atom structures can provide synergistic functions based on multiple active sites and reactants, which significantly improve their catalytic performance. However, the structure-activity relationships of these special structures remain elusive. Here, we report atomically dispersed Fe-Ni dual-metal catalysts anchored on N-doped graphene as an efficient catalyst for CO oxidation. The density functional theory (DFT) calculation results show that Ni serves as a catalytic nucleophilic center for CO adsorption, whereas Fe serves as an electrophilic center for O2 adsorption, making full use of the dual-metal active sites. Thus, a heteronuclear Fe1Ni1@NGr catalyst with the synergistic effect of combining dissimilar metal atoms has better catalytic activity and lower propensity for CO poisoning than its homonuclear counterparts. Comparing the Langmuir-Hinshelwood (LH) and Eley-Rideal (ER) mechanisms for CO oxidation on Fe1Ni1@NGr, Ni2@NGr, and Fe2@NGr, we find that the LH mechanism with coadsorbed CO and O2 is dynamically more favorable. In addition, residual oxygen atoms attached to the Fe-Ni active sites can easily react with additional CO molecules, indicating the achievement of a high recycling rate. These findings reveal a synergistic catalytic mechanism of graphene-supported atomically dispersed transition dual-metal catalysts, providing important guidance for the rational design of atomically dispersed catalysts.

Original languageEnglish
Pages (from-to)5616-5622
Number of pages7
JournalJournal of Physical Chemistry C
Volume125
Issue number10
Early online date2021
DOIs
Publication statusPublished - 18 Mar 2021
MoE publication typeA1 Journal article-refereed

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