Characteristics of Ni-Nb-based metallic amorphous alloys for hydrogen-related energy applications
- Characteristics of Ni-Nb-based metallic amorphous alloys for hydrogen-related energy applications
- S. Jayalakshmi; V.S. Vasantha; 에릭플러리; M. Gupta
- hydrogen energy; amorphous alloys; hydrogen absorption capacity; embrittlement; permeation; bipolar plates
- Issue Date
- Applied energy
- VOL 90, NO 1, 94-99
- In hydrogen-related energy technologies, materials selection is critical as hydrogen tends to decrease the
mechanical stability of the metallic alloys. Amorphous alloys are known to exhibit high hydrogen solubility
and significant embrittlement resistance. The current work is focussed towards the properties of
several (Ni–Nb)-based amorphous alloys for use in hydrogen-related energy applications. Based on the
studies pertaining to hydrogenation characteristics and mechanical stability, it was observed that the
Ni–Nb-based amorphous alloys have high absorption capacity, with hydrogen-to-metal ratio (H/
M) ~ 1.8 (~2.30 wt.% of hydrogen) and excellent embrittlement resistance (H/M ~ 0.8), due to their
unconventional structure and high hydrogen solubility, but these properties are strongly dependent on
the alloy compositions. Investigations carried out to study the hydrogen permeation behavior of various
Ni–Nb base amorphous alloys under gas permeation conditions for application as permeation membranes
indicated that the Ni–Nb-based amorphous alloys exhibit high hydrogen permeabilities
(~1.1 x 10-8 mol m-1 s-1 MPa-1/2), comparable to that of Pd–Cu, in the temperature range 300–550 ℃.
The corrosion behavior of the Ni–Nb alloys investigated under simulated proton-exchange membrane
fuel cells (PEMFC) conditions, for use as bipolar plates in PEMFC exhibited excellent corrosion resistance,
with corrosion and passivation current densities nearly comparable to those of graphite, the currently
used material for bipolar plates. From these studies, it was understood that the inherent structure of
the alloys and the constituent alloying elements played an important role in determining the properties.
Based on our investigations, and from the hydrogen storage properties of amorphous alloys existing from
literature, it is envisioned that amorphous alloys are most promising
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