Issue 33, 2018

3D cellular CoS1.097/nitrogen doped graphene foam: a durable and self-supported bifunctional electrode for overall water splitting

Abstract

The design and development of highly efficient and durable non-precious metal catalysts are of great significance for the HER and the OER, especially bifunctional catalysts for overall water splitting. Here, a series of novel composites of 3D nitrogen-doped graphene foams with homogeneously dispersed CoS1.097 nanoparticles (NPs) are synthesized through hydrazine-induced foaming and thermal-treatment process at different temperatures. Notably, the composite thermally treated at 750 °C (CoS1.097/NGF-750) which possesses continuous 3D porous structures exhibits super-hydrophilic properties and ultra-high catalytic activity, providing a current density of 10 mA cm−2 at a low overpotential of 240 mV for the OER and 124 mV for the HER, respectively. In addition, a self-supported two-electrode electrolyzer assembled using CoS1.097/NGF-750 as both the cathode and anode exhibits the current densities of 10 and 20 mA cm−2 at potentials of 1.56 V and 1.65 V, respectively, and long-term stability (95% of the activity remained after 45 h). Furthermore, this novel catalyst can be produced on a large scale, therefore it could be promising for practical applications in overall water splitting.

Graphical abstract: 3D cellular CoS1.097/nitrogen doped graphene foam: a durable and self-supported bifunctional electrode for overall water splitting

Supplementary files

Article information

Article type
Paper
Submitted
07 Jun 2018
Accepted
22 Jul 2018
First published
24 Jul 2018

J. Mater. Chem. A, 2018,6, 16235-16245

3D cellular CoS1.097/nitrogen doped graphene foam: a durable and self-supported bifunctional electrode for overall water splitting

H. Liang, D. Jiang, S. Wei, X. Cao, T. Chen, B. Huo, Z. Peng, C. Li and J. Liu, J. Mater. Chem. A, 2018, 6, 16235 DOI: 10.1039/C8TA05407J

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