Structurally ordered intermetallic Ir3V electrocatalysts for alkaline hydrogen evolution reaction

Rational Design of Vanadium-Modulated Ni3Se2 Nanorod@Nanosheet Arrays as a Bifunctional Electrocatalyst for Overall Water Splitting

“…Concerning these above-mentioned issues, incorporating some transition metal dopants is expected to optimize the electron structure for assembled catalysts, thereby accelerating the water electrolysis process. For example, the oxophilic vanadium with bargain prices, abundant resources, 3d electron configuration, and flexible valence states has the potential to tune the surface/interface electronic structure and local atomic coordination conditions for host materials. − To our knowledge, during the HER process, the presence of vanadium can facilitate water decomposition and optimize hydrogen adsorption free energy, thus improving the efficiency of hydrogen production . Meanwhile, vanadium sites possessed a higher d-band center than Ni and Fe sites in nickel hydroxide, which favored the rapid formation of oxygenated intermediate states and release from V sites during the OER process as well as the enhancement of reactive kinetics for OER .…”

“…25−28 To our knowledge, during the HER process, the presence of vanadium can facilitate water decomposition and optimize hydrogen adsorption free energy, thus improving the efficiency of hydrogen production. 29 Meanwhile, vanadium sites possessed a higher d-band center than Ni and Fe sites in nickel hydroxide, which favored the rapid formation of oxygenated intermediate states and release from V sites during the OER process as well as the enhancement of reactive kinetics for OER. 30 Further, since the catalytic reaction generally occurs at the surface and interface, the construction of the nanostructure for catalysts is favorable to expose more active sites to accelerate the water splitting process.…”

Perspective on intermetallics towards efficient electrocatalytic water-splitting

“…To obtain the intermetallic phase, the well-dispersed suspension was dried and heated at 800 and 1000 °C under H 2 /Ar (5%) for 3 h. The ordered structure was able to efficiently promote the water dissociation and enhance the kinetics for alkaline HER. 137 Likewise, PtNi/C was prepared in the same fashion but at a much lower temperature. 138 The group of Li used N-doped graphite nanotubes as a highly active substrate for their intermetallic Ni-Mo nanocatalysts, (Figure 3d).…”

“…139 Along with the synergistic effect to enhance structural and electronic properties, and enhancement of the mass-specific surface area in the intermetallic phases has been observed, which significantly contributes to the HER activity. 124,137,143 NiMo exhibited a much higher surface area and a larger turnover frequency per-surface atom resulting in a higher mass activity for HER. The tested intermetallic phase was stable in alkaline media and only degraded in acidic media.…”

“…The achieved η −10 was only 9.0 mV even under prolonged conditions and revealed a Tafel slope of 24.1 mV dec −1 and clearly outmatching Pt/C and Ir/C references. 137 …”