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Issue 4, 2018
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Three-dimensional supramolecular phosphomolybdate architecture-derived Mo-based electrocatalytic system for overall water splitting

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Abstract

With hydrogen bond-directed three-dimensional phosphomolybdate-based supramolecular architecture as a precursor, a Mo2C composite material (Mo2C@NC) supported by nitrogen-doped carbon matrix was fabricated successfully through calcination. In this composite material, Mo2C particles with size about 5 to 8 nm disperse evenly in the framework of nitrogen-doped mesoporous carbon matrix. In acid media, to achieve a current density of 10 mA cm−2, the overpotential required was 142 mV with a Tafel slope of 63 mV dec−1. Under basic conditions, the overpotential reduced to as low as 56 mV with a Tafel slope of 59 mV dec−1. To realize overall water splitting, MoO2-based composite material (MoO2@NC) with nitrogen-doped carbon as matrix was obtained using the same precursor as Mo2C@NC. MoO2@NC exhibits excellent oxygen evolution reaction (OER) performance with an over potential of 302 mV. With Mo2C@NC as cathode and MoO2@NC as anode, an efficient electrolyzer was constructed, which required a cell voltage of 1.60 V to achieve a current of 10 mA cm−2 in 1.0 M KOH. Furthermore, besides overall water splitting, Mo2C@NC also shows striking catalytic removal property towards 4-nitrophenol and Rhodamine B.

Graphical abstract: Three-dimensional supramolecular phosphomolybdate architecture-derived Mo-based electrocatalytic system for overall water splitting

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Publication details

The article was received on 22 Dec 2017, accepted on 27 Jan 2018 and first published on 29 Jan 2018


Article type: Research Article
DOI: 10.1039/C7QI00812K
Citation: Inorg. Chem. Front., 2018,5, 819-826
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    Three-dimensional supramolecular phosphomolybdate architecture-derived Mo-based electrocatalytic system for overall water splitting

    M. Mei, X. Xu, Y. Wang, X. Wang and Y. Huo, Inorg. Chem. Front., 2018, 5, 819
    DOI: 10.1039/C7QI00812K

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