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Issue 4, 2018
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Nickel metal–organic framework implanted on graphene and incubated to be ultrasmall nickel phosphide nanocrystals acts as a highly efficient water splitting electrocatalyst

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Abstract

The development of low-cost, efficient, and stable electrocatalysts with bifunctional catalytic activity for overall water splitting is desirable but remains a great challenge. Here, a template-confinement strategy is presented with nickel metal–organic framework (MOF-74-Ni) implanted on graphene oxide and incubated by low temperature phosphorization to become ultrasmall nickel phosphide nanocrystals anchored on reduced graphene oxide (termed Ni2P/rGO). The size-controlled synthesis of ultrasmall metal-based catalysts is of vital economic interest and scientific importance for chemical conversion technologies. The Ni2P/rGO guarantees large active surface area and perfect dispersity of the active sites with ultrasmall particle sizes (average about 2.6 nm), which can serve as a highly efficient electrocatalyst for overall water splitting. In 1.0 M KOH, the Ni2P/rGO exhibited remarkable electrocatalytic performance for both HER and OER, affording a current density of 10 mA cm−2 at overpotentials of 142 mV for HER and 260 mV for OER with small Tafel slope. Furthermore, an electrolyzer employed with Ni2P/rGO as a bifunctional catalyst in both the cathode and anode in 1.0 M KOH generated 10 mA cm−2 at a voltage of 1.61 V with excellent stability, comparable to the integrated Pt/C and RuO2 counterparts, which is among the best performances of transition metal phosphides (TMPs).

Graphical abstract: Nickel metal–organic framework implanted on graphene and incubated to be ultrasmall nickel phosphide nanocrystals acts as a highly efficient water splitting electrocatalyst

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Publication details

The article was received on 20 Nov 2017, accepted on 20 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA10218F
Citation: J. Mater. Chem. A, 2018,6, 1682-1691
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    Nickel metal–organic framework implanted on graphene and incubated to be ultrasmall nickel phosphide nanocrystals acts as a highly efficient water splitting electrocatalyst

    L. Yan, H. Jiang, Y. Xing, Y. Wang, D. Liu, X. Gu, P. Dai, L. Li and X. Zhao, J. Mater. Chem. A, 2018, 6, 1682
    DOI: 10.1039/C7TA10218F

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