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Nitrogen-Enriched Polydopamine Analogue-Derived Defect-Rich Porous Carbon as Bifunctional Metal-Free Electrocatalysts for Highly Efficient Overall Water Splitting

Abstract

The development of efficient, low-cost, and durable electrocatalysts toward both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of great significance for overall water splitting associated with renewable energy conversion and storage. Carbon-based nanomaterials have been widely employed as electrocatalysts for independent HER or OER, however, research on bifunctional metal-free electrocatalysts for water splitting is still in its infancy and remains a formidable challenge to develop highly active catalysts for future applications. Here we report a highly active defect-rich, carbon-based, bifunctional metal-free water splitting electrocatalyst, prepared by a templating approach, for which nitrogen-enriched polydopamine analogue is used as carbon precursor. The resultant defect-rich porous carbon (DRPC) exhibits a large specific surface area with hierarchically micro/meso porous structure, and high nitrogen doping content with rich pyridinic N. Accordingly, the newly developed DRPC electrocatalysts display superb bifunctional catalytic activities for both HER and OER in alkaline solution, outperforming all other reported metal-free catalysts. Significantly, the DRPC catalyst couple-based alkaline water electrolyzer with strong durability deliever 10 mA cm-2 overall water splitting current at a considerably low voltage of 1.74 V, and a demonstration of a self-powered electrochemical water splitting system is also presented, highlighting great potential for practical applications.

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Publication details

The article was received on 09 May 2017, accepted on 12 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03999A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Nitrogen-Enriched Polydopamine Analogue-Derived Defect-Rich Porous Carbon as Bifunctional Metal-Free Electrocatalysts for Highly Efficient Overall Water Splitting

    Z. Zhang, Z. Yi, J. Wang, X. Tian, P. Xu, G. Shi and S. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03999A

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