Encapsulation of Ni3Fe Nanoparticles in N‐Doped Carbon Nanotube–Grafted Carbon Nanofibers as High‐Efficiency Hydrogen Evolution Electrocatalysts

By Tongfei Li, Gan Luo, Kunhao Liu, Xin Li, Dongmei Sun, Lin Xu, Yafei Li, Yawen Tang. Advanced Functional Materials, 2018

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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 (ΔGH* = −0.14 eV), further manifesting their superior HER activity. The present work will advance the development of highly efficient nonprecious electrocatalysts for energy conversion.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/097daeb2778ee32d35b9c911500b4fb20213264a