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Issue 3, 2016
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Novel cobalt quantum dot/graphene nanocomposites as highly efficient electrocatalysts for water splitting

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Abstract

A cost-effective, non-noble metal based high-performance electrocatalyst for the oxygen evolution reaction (OER) is critical to energy conversion and storage processes. Here, we report on a facile and effective in situ strategy for the synthesis of an advanced nanocomposite material that is comprised of cobalt quantum dots (Co QDs, ∼3.2 nm), uniformly dispersed on reduced graphene oxide (rGO) as a highly efficient OER electrocatalyst platform. This nanocomposite electrocatalyst afforded a mass activity of 1250 A g−1 at a low overpotential (η) of 0.37 V, a small Tafel slope of ∼37 mV dec−1 and a turnover frequency (TOF) of 0.188 s−1 in 0.1 M KOH, comparing favorably with state-of-the-art RuO2, IrO2 and Pt/C catalysts. The synergy between abundant catalytically active sites through the fine dispersion of Co QDs, and enhanced electron transfer generated from the graphene resulted in first-rate electrocatalytic properties toward the OER. These merits coupled with the higher stability of the nanocomposite hold great promise for triggering breakthroughs in electrocatalysis for water splitting.

Graphical abstract: Novel cobalt quantum dot/graphene nanocomposites as highly efficient electrocatalysts for water splitting

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Publication details

The article was received on 28 Sep 2015, accepted on 10 Dec 2015 and first published on 10 Dec 2015


Article type: Paper
DOI: 10.1039/C5NR06726J
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Nanoscale, 2016,8, 1485-1492

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    Novel cobalt quantum dot/graphene nanocomposites as highly efficient electrocatalysts for water splitting

    M. Govindhan, B. Mao and A. Chen, Nanoscale, 2016, 8, 1485
    DOI: 10.1039/C5NR06726J

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