Robust self-stabilized electrode based on Al-based metallic glasses for high-efficient hydrogen evolution reaction
Electrode with low performance or limited endurance for water splitting hydrogen generation has been the key limitation for application of hydrogen in contemporary clean-energy technologies. In this paper, the Al80Ni6Co3Mn3Y5Au3 metallic glass ribbon with outstanding catalytic activity in hydrogen evolution reaction (HER) in acidic solutions is fabricated for the first time. The over-potential is about 70 mV @ 10 mA cm-2 and the Tafel slope is about 39 mV dec-1, which are comparable to commercial noble Pt/C electrode (33 mV @ 10 mA cm-2, 38 mV dec-1). Such a high catalytic reactivity is attributed to the synergic effect of multiple elements that disperse atomically homogeneously on the nanoporous surface. The outstanding catalytic activity persists and even becomes much better over long-time reaction, which is attributed to the formation of protective Au-rich layer in the interface. The Al-based metallic glass ribbon is flexible with high yield strength, large elasticity and good electric conductivity, which are desirable and promising characteristics as free-standing catalytic electrode in HER.