In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 11 ( 2023), p. 5734-5745
Abstract:
To enter the era of a clean and sustainable hydrogen economy, it is crucial to first discover non-noble metal electrocatalysts that can be used for oxygen evolution reactions (OER) of water electrolyzers. Herein, we demonstrate highly active and durable Co- and Sn-co-doped Ni 3 S 2 catalysts supported on Ni foam (CoSn-Ni 3 S 2 @NF) for the OER in alkaline media. Benefiting from the hierarchically porous nanosheet morphology and synergistic strong electron interaction among Co, Sn, and Ni ions, the CoSn-Ni 3 S 2 @NF achieves outstanding OER activity in 1 M KOH with a low overpotential of 321 mV at a current density of 0.2 A cm −2 . Furthermore, the CoSn-Ni 3 S 2 @NF alkaline water electrolysis cell shows a significantly high current density of 1.367 A cm −2 at a cell voltage of 2.0 V under 80 °C and 30 wt% KOH condition using a nickel–iron layered double hydroxide for the hydrogen evolution reaction and a Zirfon PERL separator (500 μm). Based on the defect formation energy and electronic structure obtained using density functional theory calculation, the enhanced intrinsic activity of CoSn-Ni 3 S 2 @NF can be attributed to the Co and Sn dopants with S vacancies, which increase activation sites (and free electrons) and favorably modify the Ni 3d-band center to be closer to the Fermi level. This work not only demonstrates a highly electrocatalytic active OER catalyst for water electrolyzers, but also provides a new design principle that can be used for high performance materials by tailoring the electronic structure of transition and post transition metal ions.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
