title: N-doped graphene layers encapsulated NiFe alloy nanoparticles derived from MOFs with superior electrochemical performance for oxygen evolution reaction.
abstract: Water splitting, an efficient approach for hydrogen production, is often hindered by unfavorable kinetics of oxygen evolution reaction (OER). In order to reduce the overpotential, noble metal oxides-based electrocatalysts like RuO2and IrO2are usually utilized. However, due to their scarcity, the development of cost-effective non-precious OER electrocatalysts with high efficiency and good stability is urgently required. Herein, we report a facile one-step annealing of metal-organic frameworks (MOFs) strategy to synthesize N-doped graphene layers encapsulated NiFe alloy nanoparticles (NiFe@C). Through tuning the nanoparticle size and calcination temperature, NiFe@C with an average size of around 16 nm obtained at 700 °C exhibits superior OER performance with an overpotential of only 281 mV at 10 mA cm-2and high durability. The facile synthesis method and excellent electrochemical performance show great potential of NiFe@C in replacing the precious metal-based electrocatalysts in the OER.
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea.
authors.forename: Yi
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea.
authors.forename: Xin-Yao
authors.initials: XY
authors.lastname: Yu
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea.
authors.forename: Ungyu
authors.initials: U
authors.lastname: Paik