Molybdenum and Tungsten Nanostructures and Methods for Making and Using Same
【China Molybdenum Industry News Network】
With the objective of exploiting the decrease in overpotential by carrying out the HER in acidic media, cheaper, stable and active non-noble metal-based electrocatalysts for the HER have been developed.
Guided by the ‘volcano plot’ (Trasatti (1972) J. Electroanal. Chem. 39:163-184) in which the activity for hydrogen evolution as a function of the M-H bond strength exhibits an ascending branch followed by a descending branch, peaking at Pt, it is proposed that combining or alloying a metal that binds hydrogen weakly with a metal that binds it strongly, a functional but relatively inexpensive HER catalyst could be developed. In order to achieve optimal efficacy of such HER catalysts, a way in which to increase their resistance to acid corrosion was also desirable. Based upon this hypothesis, an alloyed material was designed on the molecular scale combining transition metals that bind H weakly with metals that bind H strongly and acid resistant nanosheets were produced by nitriding the alloyed metals on carbon supports.
Non-noble metal-molybdenum nitrides (MaMobNx) and non-noble metal-tungsten nitrides (MaWbNx) are predicted to have electronic and structural features that result in relatively active catalysts for the HER, even in acidic conditions. The abundant non-noble metals (M) may include Ni, Co, Fe, Cu in addition to other metals including Ga, Ge, Mn, Cr, V, Ti, Zr, Sc, and Y and the rarer metals, Nb, Hf, Ta, La and Ce, as well.
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