Ultrathin MoS2 wrapped N-doped carbon-coated cobalt nanospheres for OER applications

The possibilities to resolve the exponential increase in energy demand using water splitting have also triggered huge worldwide attention towards the oxygen evolution reaction using an efficient, earth-abundant and low-cost electrocatalyst. Transition metal sulfides have been established as an excellent hydrogen evolution reaction catalyst but their oxygen evolution reaction behaviour is still little explored and needs further investigations. The oxygen evolution reaction has huge potential for fuel cell and metal-air battery applications. Herein MoS2 nanolayers having interlayer spacing were hierarchically grown over N-doped carbon wrapped cobalt nanospheres derived from a cobalt-based metal-organic framework. The catalyst Co@NC@MoS2 has a low overpotential of 297 mV vs. RHE at a 10 mA cm(-2) current density. The catalyst has long term stability with a Tafel slope value of 70 mV dec(-1). A chronoamperometric study for more than 10 hours does not show any significant change in the current density of the catalyst.

Automated summary

By growing MoS2 nanolayers with interlayer spacing over N-doped carbon wrapped cobalt nanospheres derived from a cobalt-based metal-organic framework, a new catalyst Co@NC@MoS2 with low overpotential of 297 mV vs. RHE at 10 mA cm(-2) current density has been developed. The catalyst shows long-term stability with a Tafel slope value of 70 mV dec(-1) and no significant change in current density after more than 10 hours of chronoamperometric study.