Encapsulation of Ni3Fe Nanoparticles in N-Doped Carbon Nanotube-Grafted Carbon Nanofibers as High-Efficiency Hydrogen Evolution Electrocatalysts
Li, TF (Li, Tongfei)[ 1 ] ; Luo, G (Luo, Gan)[ 1 ] ; Liu, KH (Liu, Kunhao)[ 1 ] ; Li, X (Li, Xin)[ 1 ] ; Sun, DM (Sun, Dongmei)[ 1 ] ; Xu, L (Xu, Lin)[ 1 ]*（徐林） ; Li, YF (Li, Yafei)[ 1 ]*（李亚飞） ; Tang, YW (Tang, Yawen)[ 1 ]*（唐亚文）
[ 1 ] Nanjing Normal Univ, Jiangsu Key Lab New Power Batteries, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Nanjing 210023, Jiangsu, Peoples R China
ADVANCED FUNCTIONAL MATERIALS,201812,28,51
The exploration of cost-effective yet high-efficiency inexpensive electrocatalysts for the hydrogen evolution reaction (HER) is of critical significance for future renewable energy conversion technologies. A feasible electrospinning strategy to construct a novel 1D hierarchical nanoarchitecture comprising Ni3Fe nanoalloy-encapsulated carbon nanotubes grown onto N-doped carbon nanofibers (abbreviated as Ni3Fe@N-C NT/NFs) is demonstrated here. Benefiting from the abundant firmly immobilized Ni3Fe nanoparticles for catalytic sites and hierarchical fibrous nanostructures for effective electron transport and mass diffusion, the resultant Ni3Fe@N-C NT/NFs display an extraordinary HER activity with a low overpotential of 72 mV to reach a current density of 10 mA cm(-2) in KOH medium and a remarkable stability for 40 000 s. Theoretical studies corroborate that the resultant Ni3Fe@N-C NT/NFs exhibit a favorable Gibbs free energy of hydrogen adsorption (Delta G(H*) = -0.14 eV), further manifesting their superior HER activity. The present work will advance the development of highly efficient nonprecious electrocatalysts for energy conversion.