Electrocatalytic Oxygen Evolution on Electrochemically Deposited Cobalt Oxide Films: Comparison with Thermally Deposited Films and Effect of Thermal Treatment

Co3O4 Nanorods—Efficient Non-noble Metal Electrocatalyst for Oxygen Evolution at Neutral pH

“…Q p is the value of a capacitor, which is in parallel with the resistance R p , included to correctly model with charge associated with the adsorbed intermediate. The same equivalent circuit for the faradaic reaction, OER, has been suggested in many reports [64][65][66][67][68]. The two semicircles shown in Fig.…”

“…4a is used to fit the impedance plots obtained at different applied potentials. In this equivalent circuit, R x refers to the solution resistance, Q dl refers to the double-layer capacitance, R ∞ refers to the charge transfer resistance and R p and Q p refer to the resistance and capacitance associated with adsorption of reaction intermediates, respectively [64][65][66][67][68]. R ∞ and R p are associated with the interfacial electron transfer.…”

Transition‐Metal (Co, Ni, and Fe)‐Based Electrocatalysts for the Water Oxidation Reaction

“…Electrodeposition is also applied as an efficient method to prepare amorphous materials with the advantages of simple, low‐cost, template‐free, and large‐scale production . For example, Du's group prepared highly active thin CoO x catalyst films via electrodeposition using different molecular cobaloximes under benign conditions .…”

Spontaneous Deposition of Iridium onto Nickel Substrates for the Oxygen Evolution Reaction

“…As only the electrode prepared from solution B was stable during cyclic voltammetry and OER at 50 mA cm −2 , the electrocatalytic activity of this electrode was compared with an uncoated Ni substrate ( Figure 5). As discussed elsewhere, the activity of Ni for OER is strongly dependent on its pretreatment and can change dramatically when subjected to cyclic voltammetry prior to measuring the polarisation curve [34] or prolonged OER [27,28,35]. It has also been shown that the apparent electrocatalytic activity of Ni for the OER can depend on the scan direction used to measure puesdo-steady-state polarisation curves and periodic interruptions to galvanostatic OER [35].…”

“…This mechanism of oxide layer formation is very similar to cathodic deposition of oxides such as CoO x [27], which uses cathodic hydrogen evolution to increase the surface pH thereby initiating localised oxide nucleation. To confirm that the hydrogen evolution reaction could be occurring in parallel with the Ir deposition process, the potential of the Ni substrate was measured and found to be around -0.22 to -0.2 V vs. AgAgCl (i.e.…”