Effective oxygen evolution of NCF@CoNiO2 with one-dimensional core-shell structure synthesized by induced effect of polymer nanofibers.

The non-noble bimetallic oxides have recently received more and more attention in electrocatalytic oxygen evolution reaction (OER) because of their potential to replace traditional precious metal catalysts, but the low activity and stability limit their wide application. Herein, the bimetallic oxide CoNiO 2 layers are decorated on the nitrogen-doped carbon nanofibers (NCF) through in situ grown of Ni(Co) bimetal organic frameworks (Ni(Co)-MOFs) on polyacrylonitrile nanofibers and subsequent pyrolysis process, so that a new NCF@CoNiO 2 electrocatalyst with one-dimensional (1D) core-shell structure is synthesized by structural induced effect of polyacrylonitrile nanofibers. Importantly, the unique interconnected network formed in the 1D NCF@CoNiO 2 electrocatalyst effectively improves electron mobility and mass transport capacity, thus exhibiting the glorious OER activity and long-term stability in alkaline solutions. As a result, the optimal NCF@CoNiO 2 -7 electrocatalyst requires an overpotential of 518 mV for OER at the current density of 100 mA cm−2, which is obvious lower than that of RuO 2 (633 mV) and CoNiO 2 /C-7 as a contrast sample (569 mV), respectively. This work opens up a new path for structural control of 1D bimetallic oxides to improve OER activity and stability. [Display omitted] • The NCF@CoNiO 2 electrocatalyst with a 1D core-shell structure is exploited. • 1D core-shell structure ascribes to structural induced effect of polymer nanofibers. • The NCF@CoNiO 2 exhibits superior OER activity and stability. • Interconnected network improves electron mobility and mass transport capacity. [ABSTRACT FROM AUTHOR]