Local Atomic Structure and Catalytic Activities in Electrodeposited Mo-Ni Alloys

Abstract

The atomic structures of Mo-Ni alloys electrodeposited from aqueous solutions containing various molybdenum and nickel concentrations were studied by X-ray diffraction. The films are arranged with respect to molybdenum concentrations in the films. That is, the Group I (Mo < 10%), the Group II (20% < Mo < 30%) and the Group III (Mo ≈ 40%). In the Group I, the structures of the films are fcc crystals of nickel solid solutions. The films in the Groupes II and III are amorphous. The hydrogen evolution as an electrode in alkaline water electric cell was also compared. At about 20% molybdenum, the nickel film shows the maximum hydrogen evolution.

Enabling Silicon for Solar-Fuel Production

“…The Ni/Mo ratio is controlled by the concentration of Mo-containing salt used in the Ni plating solution. Results showed that an increased Mo concentration caused poor adhesion and lower HER catalytic activity than a pure Ni metal catalyst, which was similar to previously observed results . Importantly, maintaining the proper cathodic current density during electrochemical deposition is essential to obtain active NiMo catalysts with a high surface area.…”

“…Results showed that an increased Mo concentration caused poor adhesion and lower HER catalytic activity than a pure Ni metal catalyst, which was similar to previously observed results. 350 Importantly, maintaining the proper cathodic current density during electrochemical deposition is essential to obtain active NiMo catalysts with a high surface area. However, the large surface area of NiMo does not necessarily enhance the energy conversion efficiency of a Si photocathode, due to the lower photovoltage between NiMo and Si compared to that between Ni and Si.…”

Characterisation of electrodeposited nanocrystalline Ni?Mo alloys

“…These alloys, such as the commercial alloy Hastelloy B, exhibit exceptional corrosion resistance in highly corrosive media such as nonaerated concentrated hydrochloric solutions [8]. They are also known as good catalysts for hydrogen evolution [9][10][11]. Although molybdenum cannot be separately deposited in aqueous solutions, it can be co-discharged with an iron-group metal, in the presence of appropriate complexing agents [12].…”

Electrochemically Deposition of High Mo Content Amorphous/Nanocrystalline Ni-Mo Using Ionic Liquids as Additive

“…This electrocatalytic activity is due to the low overvoltage of hydrogen on Mo and Ni (16). Generally unique characteristics and properties of nickel-molybdenum alloys, such as superior hardness, excellent resistance to wear and corrosion, as well as their electrocatalytic characteristics have made these types of alloys one of the researchers' interests (17)(18)(19)(20)(21)(22). In many cases of codeposition of nickel-molybdenum, citrate is used as complexing agent, because citrate in the electrolyte assures the pH stability during the deposition phenomena (11).…”