Issue 4, 2018

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

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

Supplementary files

Article information

Article type
Research Article
Submitted
22 déc. 2017
Accepted
27 janv. 2018
First published
29 janv. 2018

Inorg. Chem. Front., 2018,5, 819-826

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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