A review of nickel-molybdenum based hydrogen evolution electrocatalysts from theory to experiment

Key components and design strategy of the membrane electrode assembly for alkaline water electrolysis

“…148 Compared to Ni-only catalysts, the stability and HER activity have been found to be improved by the addition of Mo to Ni to produce intermetallics or disordered compounds. 149 In intermetallic compounds, the atomic fraction of Mo is much larger than that in disordered structures. A NiMo alloy cathode and a NiFe alloy anode were assembled and impregnated with a self-crosslinking quaternary ammonia polysulfone membrane as the MEA.…”

Positioning hydrogen reaction sites by constructing CdS/CoNiMoS4 heterojunctions for efficient photocatalytic hydrogen evolution

“…The compounds based on both metals can speed up the kinetics of reactions by facilitating the adsorption and activation of hydrogen species. 43,44 Additionally, a mixture of nickel and cobalt can produce a variety of active sites on the surface of the catalyst such that these locations might have various affinities for hydrogen species or other reaction intermediates, resulting in a more varied and effective catalytic mechanism. 18,45 Furthermore, the trend of hydrogen production of individual co-catalysts was investigated to ensure the effectiveness of multimetallic transition metal sulfide in photocatalytic water-splitting activity and is depicted in Fig.…”

Climbing the Hydrogen Evolution Volcano with a NiTi Shape Memory Alloy

“…The Ni is believed to promote water dissociation and the alloying of transition metals with empty or less filled d orbitals (e.g., Mo) believed to improve adsorption properties with respect to hydrogen. 21 Strain regulation is an alternative approach to altering catalyst properties, enabling selective tuning of geometric and electronic structure. 24 For instance, heteroatom doping can induce significant lattice mismatch and thus introduce strain to promote HERs.…”

“…Apart from the benchmark platinum group metal-based catalysts, catalysts prepared from earth-abundant materials, mainly Ni, are effective for alkaline HER . Ni itself, however, has insufficient electrocatalytic activity and poor durability associated with the formation of nickel hydride on the electrode surface, especially during prolonged cathodic polarization in the alkaline electrolyte. − Ni forms strong hydrogen bonds and cannot desorb OH – species, hindering further water dissociation. ,− …”

“…The high performance of these alloys is attributed to the electronic synergy between Ni and adjacent heteroatoms that improves surface adsorption properties. The Ni is believed to promote water dissociation and the alloying of transition metals with empty or less filled d orbitals (e.g., Mo) believed to improve adsorption properties with respect to hydrogen …”