Self-Supported Nickel Iron Layered Double Hydroxide-Nickel Selenide Electrocatalyst for Superior Water Splitting Activity

Abstract

The design of efficient, low-cost, and stable electrocatalyst systems toward energy conversion is highly demanding for their practical use. Large scale electrolytic water splitting is considered as a promising strategy for clean and sustainable energy production. Herein, we report a self-supported NiFe layered double hydroxide (LDH)-NiSe electrocatalyst by stepwise surface-redox-etching of Ni foam (NF) through a hydrothermal process. The as-prepared NiFe LDH-NiSe/NF catalyst exhibits far better performance in alkaline water oxidation, proton reduction, and overall water splitting compared to NiSe/NF or NiFe LDH/NF. Only 240 mV overpotential is required to obtain a water oxidation current density of 100 mA cm, whereas the same for the hydrogen evolution reaction is 276 mV in 1.0 M KOH. The synergistic effect from NiSe and NiFe LDH leads to the evolution of a highly efficient catalyst system for water splitting by achieving 10 mA cm current density at only 1.53 V in a two-electrode alkaline electrolyzer. In addition, the designed electrode produces stable performance for a long time even at higher current density to demonstrate its robustness and prospective as a real-life energy conversion system.

Highly Active Ternary Nickel–Iron oxide as Bifunctional Catalyst for Electrochemical Water Splitting

“…Thus the development of sufficiently available, low‐cost, highly active OER and/or HER electrocatalyst in alkaline medium is of high demand in the present scenario. Recently, nickel–based electrocatalysts such as oxides, hydroxides, chalcogenides, phosphides, nitrides etc. have exhibited very promising electrocatalytic performance and durability towards OER and/or HER .…”

Pt embedded Ni3Se2@NiOOH core-shell dendrite-like nanoarrays on nickel as bifunctional electrocatalysts for overall water splitting

“…However, the construction of hybrid materials still faces some challenges. The active edge sites and in-herently poor electric conductivity of TMO are the key problems for catalytic enhancement [24,25]. The synthesis of highly dispersed ultrathin TMO coupled with conductive substrate is still a challenge.…”

Effect of nickel ion doping in MnO2/reduced graphene oxide nanocomposites for lithium adsorption and recovery from aqueous media

“…Likewise, for Ni 2p 1/2 the peak at 873.1 eV attributed to Ni 2+ -Mn similar to previous literature. 41 As mentioned in Fig. 5(f) the Mn 2p spectrum, the two spin orbit doublets appeared at 642.2 eV and 653.7 eV corresponds to Mn 2p 3/2 and Mn 2p 1/2 respectively.…”