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Monolayer Graphitic Germanium Carbide (g-GeC): The Promising Cathode Catalysts for Fuel Cell and Lithium-Oxygen Battery Applications

Abstract

Designing and searching high-efficient metal-free oxygen reduction reaction (ORR) catalysts are demanding objective for academic and industrial researches. Herein, the ORR mechanism of monolayer graphitic germanium carbide (g-GeC) is studied by first-principles calculations. The monolayer g-GeC possesses excellent electro-catalytic properties that originate from the charge redistribution by electronegativity difference. Adsorption and dissociation of oxygen can easily take place at room temperature, which facilitates the following ORR catalysis. The feasibility and activity of monolayer g-GeC as cathode catalysts in fuel cells and nonaqueous Li-O2 battery is evaluated by free energy diagram. The calculation results reveal that the g-GeC displays very low overpotentials that are comparable to Pt-based catalysts. This work provides a novel understanding of the electrochemical performance of g-GeC materials, and suggests its great potential as metal-free ORR catalyst to institute the traditional Pt-based catalysts.

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Publication details

The article was received on 16 Nov 2017, accepted on 01 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA10118J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Monolayer Graphitic Germanium Carbide (g-GeC): The Promising Cathode Catalysts for Fuel Cell and Lithium-Oxygen Battery Applications

    Y. Ji, H. Dong, T. Hou and Y. Li, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10118J

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