W-Doped α-Ni(OH)₂ Honeycomb-like Microstructures for Promoted Electrochemical Oxygen Evolution

Abstract

It is critical for converting renewable electricity into chemicals and fuels to develop electrocatalysts with good reactivity and high stability for oxygen evolution reaction (OER) using a cost-effective and straightforward manner. Here, we successfully fabricated W-doped α-Ni­(OH)2 honeycomb-like microstructures deposited on nickel foam (NF) using an easy and fast one-step electrodeposition approach. Some parameters affecting the morphology and OER activity of the target product were systematically investigated, including the initial nickel source, the deposition time, and the deposition current density. It was found that W-doped α-Ni­(OH)2 honeycomb-like microstructures deposited from the NiSO4 solution at −100 mA cm–2 for 15 min manifested the strongest electrocatalytic OER capability. In 1.0 M KOH, only 170/209 mV of overpotential was required for the as-obtained W-Ni­(OH)2/NF electrode to launch a current density of 10/100 mA cm–2, respectively, outperforming most previously reported electrocatalysts. Also, the as-prepared catalyst showed outstanding long-term stability without attenuation over 400 h at a large current density of 250 mA cm–2. Distinctly, the present electrochemical deposition technology paves a facile and fast pathway for preparing nonprecious metal OER electrocatalysts with high electroactivity.

Ce-Doped NiFe Layered Double Hydroxide/NiFe2O4 Nanosheet Catalysts for Water Oxidation

“…Figure 2b Also, the above facts revealed that the participation of NaCl promoted the increase of the Ni 3+ content, which is generally considered to be the active center of OER. 35,36 In Figure 2e, the O 1s spectra were deconvoluted into three types of oxygen species of metal−oxygen (529.98 eV), oxygen vacancy (531.37 eV), and hydroxyl oxygen (531.77 eV). 37 In Ce-NiFe LDH/ NiFe 2 O 4 , the M−OH peak was stronger than that in NiFe 2 O 4 .…”

Engineering Active Sites Enriched 2D-on-1D NiFe and NiCo Layered Double Hydroxide-Decorated Ni Nanowire Networks for Oxygen Evolution Reaction

“…Transition metal-based electrocatalysts represent promising competitors that can replace noble metal-based ones, including oxides, hydroxides, sulfides, nitrides, and phosphides. − Among these materials, LDHs have emerged as a highly promising class capable of meeting the majority of the criteria for effective electrocatalysts in alkaline media due to their distinguished 2D structure with interlayer spaces, large active surface areas, and tunable compositions. , NiFe LDH is regarded as highly efficient as an electrocatalyst in alkaline media due to its ability to facilitate the OER process with a low overpotential. − Several studies have been conducted to further enhance the NiFe-LDH activity toward the OER. However, developing an ideal electrocatalyst for the OER is not yet accomplished.…”

Three-dimensional nickel nanowires modified by amorphous Fe nanosheets as electrocatalysts for the oxygen evolution reaction

“…Dong et al 11 deposited 3D nickel porous structure on different metal substrates to obtain electrode materials with high electrocatalytic activity in the HER and the OER. Wang et al 12 prepared highly stable honeycomb microstructure electrodes by the electrodeposition of W-doped α-Ni(OH) 2 on nickel foam. However, compared to PGMs, nickel has low catalytic activity and a higher OER overpotential.…”