Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

• DOI: 10.1039/d3cp01444d
• Publication Date: 2023-07-07T10:21:13Z
• Authors: Xiuyu Wu; Alexis Piñeiro-Ga...; Mouna Rafei; Nicolas Boulanger; Esdras Josué Cant...; Eduardo Gracia-Es...
• Keywords: Overpotential; Oxygen evolution

Foam-like NiMo coatings were produced from an inexpensive mixture of Ni, Al, and Mo powders via atmospheric plasma spraying. The deposited onto stainless-steel meshes forming a highly porous network mainly composed nanostructured Ni active Ni4Mo. High material loading (200 mg cm-2) with large surface area (1769 cm2 per cm2) was achieved without compromising the foam-like characteristics. exhibited excellent activity towards both hydrogen evolution (HER) oxygen (OER) reactions in alkaline media. HER coating required overpotential 42 mV to reach current density -50 mA cm-2 minimum degradation after 24 h chronoamperometry test at -10 cm-2. Theoretical simulations showed that several crystal surfaces Ni4Mo exhibit near optimum adsorption energies improved water dissociation benefit activity. OER also consisting only 310 achieve 50 maintained even 48 continuous operation. We envisage development scalable production techniques for alloys will greatly its usage commercial electrolysers.