3D cellular CoS1.097/nitrogen doped graphene foam: a durable and self-supported bifunctional electrode for overall water splitting. Issue 33 (10th August 2018)

• Record Type: Journal Article
• Authors: Liang, Hui; Jiang, Degang; Wei, Shuang; Cao, Xueying; Chen, Tao; Huo, Bingbing; Peng, Zhi; Li, Chenwei; Liu, Jingquan
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 33(2018)
• Page Start: 16235
• Page End: 16245
• Publication Date: 2018-08-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta05407j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : 3D cellular N-doped graphene foam supported CoS1.097 nanoparticles as highly active and stable bifunctional catalysts 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.