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Supramolecular Polymer-Assisted Synthesis of Nitrogen and Sulfur Dual-Doped Porous Graphene Networks from Petroleum Coke as Efficient Metal-Free Electrocatalysts for Oxygen Reduction Reaction

Abstract

Efficient metal-free carbon electrocatalysts for oxygen reduction reaction (ORR) represent a promising alternative to scarce and price noble-metal-based counterparts while their performance remains to be significantly boosted to fulfill the requirement of the real application. Herein, the rational design and synthesis of nitrogen and sulfur co-doped porous graphene networks (N,S-PGN) is present for highly efficient ORR. With the assistance of superamolecular polymers, petroleum coke, a byproduct of oil refinery in million tons per year, can be converted into N,S co-doped graphene nanosheets with a highly porous architecture. Such a hierarchical and doped structure would allow high expose of active sites and facilitate the electron transport. As a result, the N,S-PGN exhibits remarkable electrocatalytic activities for ORR and in particular outperform Pt/C electrode in terms of superior diffusion-limiting current density and stability operated under the same condition. Furthermore, the increased carbon active sites and facile electrons transport are confirmed by theoretical calculations where the dual-doping in porous graphene increases the high charge densities of carbon active sites and HOMO energy for ORR. The present work demonstrates a novel and feasible route for preparing heteroatoms co-doped porous graphene for energy-related applications as well as a new strategy for value-added utilization of petroleum coke.

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Publication details

The article was received on 14 Apr 2017, accepted on 03 May 2017 and first published on 04 May 2017


Article type: Paper
DOI: 10.1039/C7TA03264A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Supramolecular Polymer-Assisted Synthesis of Nitrogen and Sulfur Dual-Doped Porous Graphene Networks from Petroleum Coke as Efficient Metal-Free Electrocatalysts for Oxygen Reduction Reaction

    M. Wu, Y. Liu, Y. Zhu, L. Jin, J. Liu, H. Hu, Y. Wang, Q. Zhao, R. Lv and J. Qiu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03264A

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