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Type: Journal article
Title: Scalable self-supported graphene foam for high-performance electrocatalytic oxygen evolution
Author: Zhu, Y.
Ran, J.
Qiao, S.
Citation: ACS Applied Materials and Interfaces, 2017; 9(48):41980-41987
Publisher: American Chemical Society
Issue Date: 2017
ISSN: 1944-8244
Statement of
Yun-Pei Zhu, Jingrun Ran and Shi-Zhang Qiao
Abstract: Developing efficient electrocatalysts consisting of earth-abundant elements for oxygen evolution reaction (OER) is crucial for energy devices and technologies. Herein, we report self-supported highly porous nitrogen-doped graphene foam synthesized through the electrochemical expansion of carbon-fiber paper and subsequent nitrogen plasma treatment. A thorough characterization, such as electron microscopy and synchrotron-based near-edge X-ray absorption fine structure, indicates the well-developed porous structures featuring homogeneously doped nitrogen heteroatoms. These merits ensure enriched active sites, an enlarged active surface area, and improved mass/electron transport within the continuous graphene framework, thus leading to an outstanding capability toward electrocatalyzing OER in alkaline media, even competitive with the state-of-the-art noble-/transition-metal and nonmetal electrocatalysts reported to date, from the perspectives of the sharp onset potential, a small Tafel slope, and remarkable durability. Furthermore, a rechargeable Zn-air battery with this self-supported electrocatalyst directly used as the air cathode renders a low charge/discharge overpotential and considerable life span. The finding herein suggests that a rational methodology to synthesize graphene-based materials can significantly enhance the oxygen electrocatalysis, thereby promoting the overall performance of the energy-related system.
Keywords: chemical doping
electrochemical expansion
Rights: Copyright © 2017 American Chemical Society
DOI: 10.1021/acsami.7b13836
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Chemical Engineering publications

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