Facile synthesis of Cu doped cobalt hydroxide (Cu–Co(OH)₂) nano-sheets for efficient electrocatalytic oxygen evolution

Abstract

Cu doped cobalt hydroxide with a uniform ultrathin structure was synthesized by a facile and green strategy. The synthesized samples show excellent oxygen evolution activity and stability. The possible reaction mechanisms for these samples have been proposed.

A New Class of Zn1‐xFex–Oxyselenide and Zn1‐xFex–LDH Nanostructured Material with Remarkable Bifunctional Oxygen and Hydrogen Evolution Electrocatalytic Activities for Overall Water Splitting

“…Besides, the electrode materials are in situ grown on Ni‐foam is an advantageous factor in terms of high conductivity, exposure of active sites, and dissipating generated gas bubbles over electrode materials prepared using binders . Many researchers reported OER and HER catalytical activity on RDE or GCE electrodes with a sample loading of a few µg on the very small area, but for overall water splitting, the materials have to be coated on a large area of the current collector using binders, which may have a detrimental effect on overall water splitting. Thus, synthesis and bifunctional electrocatalytic activity study of Zn 1‐ x Fe x –LDH/Ni‐foam and Zn 1‐ x Fe x –oxyselenide on Ni‐foam is ideal, and they can be used directly as either anode or cathode in an electrolyzer for efficient overall water splitting.…”

“…The proposed mechanism for OER on the electrode surface in an alkaline medium is given below where M represents a metal cation.…”

“…Thus, tailoring the chemical composition of transition‐metal‐based materials with suitable cations by tuning the electronic structure represents an effective approach to achieve superior catalytic activities. Up to now, doping or mixing of metal cations has been widely studied, but introducing other anions would unexpectedly alter the physicochemical properties of catalysts, thereby leading to the significant enhancement in the catalytic activity. Very recently, Li et al studied the anionic‐regulated NiFe(oxy)sulfide electrocatalysts for OER, and found that it exhibits the lowest OER overpotential of 286 mV at 10 mA cm −2 current density, and the fastest kinetics, being 56.3 mV dec −1 .…”

Iron‐Doped Nickel Phosphide Nanosheets In Situ Grown on Nickel Submicrowires as Efficient Electrocatalysts for Oxygen Evolution Reaction

“…In recent years, enormousefforts have been made to investigate OER catalysts based on earth-abundant metals including transition metal oxides, [8,9] hydroxides, [10,11] phosphides, [12][13][14] sulfides, [15,16] selenides, [17] and their hybrids. [18][19][20] Amongt hem, monometallic phosphides,s uch as FeP, [21] CoP, [22] andN i 5 P 4 , [23] exhibit relativelyh igh electrocatalytic activities toward OER.…”

Hierarchical Cu(OH)2@Co(OH)2 Nanotrees for Water Oxidation Electrolysis

“…[21] Chen et al investigated CuÀ Co(OH) 2 nanosheets having superior electrocatalytic activity with an OER overpotential of 300 mV at 10 mA cm À 2 . [22] It has recently been confirmed that the electrocatalytic activity of transition metal oxides originates from their corresponding hydroxides/oxyhydroxides. [22][23][24] Therefore, the development of transition metal hydroxides/oxyhydroxides electrocatalysts may provide a new avenue towards water oxidation electrolysis.…”