Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 568, Issue -, Pages 54-62Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.02.034
Keywords
Oxygen reduction reaction; Transition metal dimer; Volcano plot; Density functional theory
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Funding
- National Natural Science Foundation of China, China [51871114]
- Research Foundation of the Education Department of Jiangxi Province of China, China [GJJ180433, GJJ180477]
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China [201906]
- Jiangxi University of Science and Technology Scientific Research Starting Foundation, China [jxxjbs17053]
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Various experimental investigation had proved that metal dimers possess excellent oxygen reduction reaction (ORR) activity compared to single metal atom catalysts, due to the synergistic effect exerted by two metal atoms. However, it is still unclear how the electrocatalytic activity is enhanced in a fundamental aspect. In this study, we systematically investigated five 3d transition metals (Fe, Co, Ni, Cu and Zn) by density functional theory (DFT) to explore the ability of metal dimers to catalyze the ORR. It is found that different combinations of different metal atoms have different adsorption strengths to oxygenated intermediates, which helps to screen suitable catalyst materials. The scaling relationship of the free energy of adsorption of oxygen-containing species was calculated for various metal-dimer systems. The classical volcanic diagram is derived, and it is found that the CoZnOH embedded nitrogen-doped graphene (the overpotential is 0.61 V) shows the best catalytic properties, and it is predicted that when the adsorption free energy of OH is equal to 0.95 eV, the optimal overpotential is 0.29 V. Electronic structure calculations show that the pairing of different metal atoms alters the d-band center which in turn change the adsorption properties and hence ORR catalytic performance. (C) 2020 Elsevier Inc. All rights reserved.
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