Binder-Free Synthesis of NiCo2S4 Nanowires Grown on Ni Foam as an Efficient Electrocatalyst for Oxygen Evolution Reaction

Komal Patil; Pravin Babar; Jin Hyeok Kim

doi:10.3740/MRSK.2020.30.5.217

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2020 Vol.30, Issue 5 Next Page

Binder-Free Synthesis of NiCo₂S₄ Nanowires Grown on Ni Foam as an Efficient Electrocatalyst for Oxygen Evolution Reaction

May 2020. pp. 217-222

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Abstract

The design and fabrication of catalysts with low-cost and high electrocatalytic activity for the oxygen evolution reaction (OER) have remained challenging because of the sluggish kinetics of this reaction. The key to the pursuit of efficient electrocatalysts is to design them with high surface area and more active sites. In this work, we have successfully synthesized a highly stable and active NiCo₂S₄ nanowire array on a Ni-foam substrate (NiCo₂S₄ NW/NF) via a two-step hydrothermal synthesis approach. This NiCo₂S₄ NW/NF exhibits overpotential as low as 275 mV, delivering a current density of 20 mA cm^-2 (versus reversible hydrogen electrode) with a low Tafel slope of 89 mV dec^-1 and superior long-term stability for 20 h in 1M KOH electrolyte. The outstanding performance is ascribed to the inherent activity of the binder-free deposited, vertically aligned nanowire structure, which provides a large number of electrochemically active surface sites, accelerating electron transfer, and simultaneously enhancing the diffusion of electrolyte.

Keywords

electrocatalyst

nickel-cobalt sulfide

nanowires

hydrothermal

oxygen evolution reaction

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 30
No :5
Pages :217-222
Received Date : 2020-03-30
Revised Date : 2020-03-30
Accepted Date : 2020-04-20
DOI :https://doi.org/10.3740/MRSK.2020.30.5.217

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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