Boosting Electrocatalytic Hydrogen Evolution of Nickel foam Supported Nickel Hydroxide by Ruthenium Doping

Abstract

Hydrogen evolution reaction (HER) in acid electrolytes has advantages for electrolysis of water due to large supply of hydrogen ions. Herein, we report the synthesis of ruthenium doped nickel hydroxide on commercial nickel foam (Ru−Ni(OH)2/NF) by using simple hydrothermal method. Due to integrated assembly and porous structure, as prepared Ru−Ni(OH)2/NF is explored as an electrocatalyst for HER in 0.5 M H2SO4 solution at room temperature. The Ru−Ni(OH)2/NF showed excellent electrocatalytic HER activity with Tafel slope of 94 mV/dec. The overpotential of Ru−Ni(OH)2/NF required to deliver 10 mAcm−2 current density was calculated to be 27 mV, which is smaller than that of commercial Pt/C/NF catalyst (33 mV). Furthermore, the Ru−Ni(OH)2/NF has shown decent stability and notable durability. The enhanced HER activity of Ru−Ni(OH)2/NF is attributed to Ru doping Ni(OH)2/NF and effective contacts between the Ru−Ni(OH)2 and NF substrate. Finally, these results may provide guidance to the design of Pt‐free catalysts for effective energy related electrocatalytic applications.

Fe‐Doped Porous g‐C3N4: An Efficient Electrocatalyst with Fe‐N Active Sites for Electrocatalytic Hydrogen Evolution Reaction under Alkaline Conditions

“…Hydrogen energy is considered to be one of the clean energies with the most development potential in the 21 st century and electrolysis of water is one of the most important pathways to produce hydrogen [1,2] . However, the electrocatalytic hydrogen evolution reaction (HER) of electrolyzed water is slow in kinetics, which requires efficient electrocatalysts to reduce overpotentials, promote reaction kinetics, and improve electrical energy efficiency [3–5] .…”

Ruthenium-doped Ni(OH)2 to enhance the activity of methanol oxidation reaction and promote the efficiency of hydrogen production

“… 26,27 The creation of Ni(OH) 2 is shown by the shakeup satellite peak located at 860.9 eV and 878.6 eV. 28,29 The O 1s spectrum is displayed in Fig. 2D , and Ni–OH and H 2 O were attributed to the peaks at 530.7 eV and 532.1 eV, also supporting the formation of Ni(OH) 2 .…”

Coral-shaped PtRu/Ni(OH)2 electrocatalyst promotes selective hydrogenation of benzoic acid

“…S6 †), the peaks at 531.28 and 532.48 eV are attributable to Ni 2+ -OH and O-H from Ni(OH) 2 . 42,65 Evidently, two peaks at 529.80 and 531.90 eV verify that the PtRu alloy interacts with Ni(OH) 2 mainly through Ru-O and Pt-O bonding, respectively. 66 Further, the binding energies of Ni(OH) 2 follow the order of Pt 2 Ru 1 /NF ≈ Pt 2 Ru 3 /NF ≈ Pt 2 Ru 5 / NF < Pt/NF < Ru/NF.…”