Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 14, Pages 2474-2478Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz501061n
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Funding
- U. S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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In the present study, we used a surface-science approach to establish a functional link between activity and stability of monometallic oxides during the OER in acidic media. We found that the most active oxides (Au << Pt < Ir < Ru << Os) are, in fact, the least stable (Au >> Pt > Ir > Ru >> Os) materials. We suggest that the relationships between stability and activity are controlled by both the nobility of oxides as well as by the density of surface defects. This functionality is governed by the nature of metal cations and the potential transformation of a stable metal cation with a valence state of n = +4 to unstable metal cation with n > +4. A practical consequence of such a close relationship between activity and stability is that the best materials for the OER should balance stability and activity in such a way that the dissolution rate is neither too fast nor too slow.
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