One-step electroless deposition of Pd/Pt bimetallic microstructures by galvanic replacement on copper substrate and investigation of its performance for the hydrogen evolution reaction

Gold-supported activated NiZn coatings: hydrogen evolution and corrosion studies

“…All the semi-logarithmic polarization curves ( Figure 2b) show a typical Tafel behaviour indicates that the HER is kinetically controlled [5,21]. The Au-modified electrode exhibits the highest i -1.250 , i o and α, which are directly proportional to the rate of the HER (Table II) [22]. The reduction in the -η 100 at this electrode is 69% (with respect to the Cu/Ni/NiZn), which demonstrates that the presence of Au on the catalyst surface favours the hydrogen evolution kinetics and reduces the energy input for activating the HER [23,24].…”

“…Figure 2a shows that the hydrogen evolution starts at a lower overpotential with respect to Cu/Ni after enlarging the surface by deposition of NiZn layer and then treating to the concentrated alkaline solution. The Au-modified electrode exhibits the highest i -1.250 , i o and α, which are directly proportional to the rate of the HER (Table II) [22]. All the semi-logarithmic polarization curves (Figure 2b) show a typical Tafel behaviour indicates that the HER is kinetically controlled [5,21].…”

“…The enhanced activity is related to the synergism that appears due to modification of electronic properties of one metal by presence of another metal, or geometric structure [22,30]. The enhanced activity is related to the synergism that appears due to modification of electronic properties of one metal by presence of another metal, or geometric structure [22,30].…”

“…Literature survey shows that alloy electrodes perform higher HER activity than their individual elements. The enhanced activity is related to the synergism that appears due to modification of electronic properties of one metal by presence of another metal, or geometric structure [22,30]. The surface roughness factors (R f ) of the un-modified and Au-modified Cu/Ni/ZiZn electrodes were calculated according to the published procedure [31,32] and found to be 215 and 1822, respectively.…”

Fabrication and Performance Evaluation of Pd‐Cu Nanoparticles for Hydrogen Evolution Reaction

“…prepared hierarchically structured nickel‐copper composite electrodes onto the nickel foam for the HER study. Additionally, numerous bimetallic particles such as Pd/Pt microstructures/Cu substrate, Pd/Pt nanostructure/Cu nanofoam substrate, Cu/Pt nanoparticles/poly (8‐hydroxyquinoline) and porous Pt coated nanostructured Cu‐foam/Cu electrode are important active catalysts in HER .…”