1 research outputs found
Plasma-Assisted Synthesis of Self-Supporting Porous CoNPs@C Nanosheet as Efficient and Stable Bifunctional Electrocatalysts for Overall Water Splitting
The
utilization of a highly active and robust bifunctional catalyst for
simultaneously producing H<sub>2</sub> and O<sub>2</sub> is still
a major challenging issue, which is vital for improving the efficiency
of overall water splitting. Herein, we employ a novel plasma-assisted
strategy to rapidly and conveniently synthesize the three-dimensional
(3D) porous composite nanosheets assembled on monodispersed Co nanoparticles
encapsulated in a carbon framework (CoNPs@C) on a carbon cloth. Such
a novel 3D hierarchical porous nanosheet improves the exposure and
accessibility of active sites as well as ensures high electroconductibility.
Moreover, the coating of a few graphene layers on the surface of catalysts
favors improvement of the catalytic activity. Benefited from these
multiple merits, the CoNPs@C composite nanosheets enable a low overpotential
of 153 mV at −10 mA cm<sup>–2</sup> for hydrogen evolution
reaction. Furthermore, they are also capable of catalyzing the oxygen
evolution reaction with high efficiency to achieve current density
of 10 mA cm<sup>–2</sup> at the overpotential of 270 mV. Remarkably,
when assembled as an alkaline water electrolyzer, the bifunctional
CoNPs@C composite nanosheets can afford a water-splitting current
density of 10 mA cm<sup>–2</sup> at a cell voltage of 1.65
V