Controlled synthesis of Ni(OH)₂/Ni₃S₂hybrid nanosheet arrays as highly active and stable electrocatalysts for water splitting

Abstract

Using Ni(OH)2/Ni3S2-12h as a bifunctional water splitting catalyst, with an overpotential of ∼340 mV, which is obtained at a very low cell voltage of 1.57 V with a current density of 10 mA cm−2in 1.0 M KOH.

Preparation of 3D nanostructured MnCo2S4 as a robust electrocatalyst for overall water splitting

“…Among them, MnCo 2 S 4 /NF exhibited better OER performance than Mn(OH) 2 /NF and Mn−Co‐OH/NF, and its potential was 1.54 eV, that is, the overpotential was 310 mV. This electrocatalyst exhibits better performance than previously reported electrocatalysts, such as: MnCo 2 S 4 nanowire array/Ti mesh (325 mV), Mn 3 O 4 /Ni form (350 mV), Mn 3 O 4 /CoSe 2 (450 mV), CoMn‐Layered double hydroxides (350 mV), and so on. It can be seen from the Figure a that in the case of only Mn(OH) 2 , the catalyst exhibits a weak OER activity, thus confirming that the bimetallic catalyst and the coordination between Mn and Co ions have research value for enhancing OER activity.…”

MoFe‐Codoped Ni3S2/Ni(OH)2 Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

“…The chemical state of the MoFe‐codoped Ni 3 S 2 /Ni(OH) 2 composites was studied using XPS fine spectra shown in Figure a–d. A shown in Figure a, the respective binding energies of Ni 2p 3/2 and Ni 2p 1/2 at respective 856.0 and 873.8 eV, accompanied by the obvious satellite peaks at 861.5 and 880.1 eV, can be assigned to Ni 2+ of Ni 3 S 2 /Ni(OH) 2 . The peaks at 857.4 and 875.1 eV are denoted by Ni 3+ .…”

NiCo2O4@NiMoO4 Supported on Nickel Foam for Electrocatalytic Water Splitting

“…In the foreseeable future, fossil fuels such as petroleum and coal will surely face the exhaustion. In fact, experts expect that fossil fuels that humans depend on will be depleted in five to ten years, which will be a severe challenge for human's development and survival . In addition, due to the burning of traditional fossil fuels, global warming and the greenhouse effect also came into being.…”

“…Therefore, searching for a low cost, abundant reserves, high electrocatalytic activity, bifunctional catalysts capable of performing OER and HER reactions with no noble metal properties is crucial for the wide application of electrocatalytic water splitting. There are three kinds of non‐precious metal catalysts: metal complexes containing organic ligands, polyoxometallates, and transition metal‐containing metal oxides, hydroxides compound etc. Among those the most widely studied catalyst is the multi‐metal oxides containing cobalt and nickel.…”

“…In fact, experts expect that fossil fuels that humans depend on will be depleted in five to ten years, which will be a severe challenge for human's development and survival. [1] In addition, due to the burning of traditional fossil fuels, global warming and the greenhouse effect also came into being. It is precisely because of the massive consumption of fossil fuels that it has led to humaninduced climate phenomena such as extreme climates and the melting of polar ice caps.…”