Inert V₂O₃ oxide promotes the electrocatalytic activity of Ni metal for alkaline hydrogen evolution

Abstract

Inert V2O3 oxide without reducible metal cations has been demonstrated to greatly promote the HER activity of Ni by creating highly active metal/oxide interfaces.

Maximized Schottky Effect: The Ultrafine V2O3/Ni Heterojunctions Repeatedly Arranging on Monolayer Nanosheets for Efficient and Stable Water‐to‐Hydrogen Conversion

“…Vanadium (V)‐based electrocatalysts (such as VS 2 , [ 10,11 ] VN, [ 12–15 ] VP, [ 16 ] and V 2 O 3 [ 17–19 ] ) are conducive for its application in catalysis fields, because of its more valence state diversity. Catalytic activities of the vanadium‐based electrocatalyst are closely related with its electronic structure.…”

In Situ Growth of Ultrafine Pt Nanoparticles onto Hierarchical Co3O4 Nanosheet‐Assembled Microflowers for Efficient Electrocatalytic Hydrogen Evolution

“…The hydroxides or oxides with good water affinity and optimal binding energy to OH − can serve as promoters for water dissociation under alkaline conditions [6] . Therefore, a number of hydroxides or oxides, including Ni(OH) 2 , [7] Co(OH) 2 , [8] Co 3 O 4 , [9] NiO, [10] CeO 2 , [11] MoO 2 , [12] V 2 O 3 [13] and so on, have been extensively employed as substrates to support metal nanoparticles, forming intimate metal/(hydroxide) oxide heterointerfaces with synergistic effect to boost the catalytic activity. On the other hand, constructing hierarchical‐structured electrocatalysts with open configuration is a powerful approach to enlarge the electrochemical active surface area, ensure the sufficient permeation of electrolyte and facilitate the release of evolved gas bubbles, thus significantly accelerating reaction kinetics and stability during the electrocatalytic process [14] .…”

“…Moreover, the in situ generation of Pt nanoparticles on Co 3 O 4 substrates ensures intimate contact and good mechanical adhesion, which results in excellent electron transfer between Pt catalyst and Co 3 O 4 substrate. Second, the abundant metal/oxide interfaces are experimentally and theoretically believed to lower the energy barrier for water dissociation and optimize the hydrogen binding energy to expedite the desorption of molecular hydrogen, thereby significantly improving the intrinsic activity of Pt/Co 3 O 4 microflowers and facilitating the HER pathway [13, 24] . Third, the hierarchical architecture of the Pt/Co 3 O 4 microflowers ensures the sufficient permeation of electrolyte, accelerates the mass diffusion and promotes the release of evolved H 2 bubbles, noticeably boosting the HER kinetics.…”

Fabrication of Coral‐Shaped MoS2@Ni(Mn)VOX Electrocatalyst for Efficient Alkaline Hydrogen Evolution

“…[21] For example, the introduction of the nickel vanadium oxide interface may enhance the performance of HER because vanadium and its derivatives have a large number of empty d-orbitals and the strong electron interaction to modify nickel atoms. [22][23][24][25] In addition, various transition metal matrix composites exhibit better electrocatalytic activity than the single-metal matrix such as Ni/V 2 O 3 , [26] NiÀFe-layered double hydroxides, [27] NiCoMo, [28] Ni 3 (VO 4 ) 2 @NiCo 2 O 4 , [29] and so on. Although much work has been done in alkaline hydrogen evolution inspired by the synergism of multiple transition metals, the stability and activity of current catalysts are still far away from meeting the requirements of the commercial electrolytic cells.…”